1 R Interim Report on an Inpatient Rehabilitation Facility Prospective Payment System Grace M. Carter, Daniel A. Relles, and Barbara O. Wynn, with Jennifer H. Kawata, Susan M. Paddock, Neeraj Sood, and Mark E. Totten DRU-2309-HCFA July, 2000 RAND Health The RAND unrestricted draft series is intended to transmit preliminary results of RAND research. Unrestricted drafts have not been formally reviewed or edited. The views and conclusions expressed are tentative. A draft should not be cited or quoted without permission of the author, unless the preface grants such permission. RAND is a nonprofit institution that helps improve policy and decisionmaking through research and analysis. RAND s publications and drafts do not necessarily reflect the opinions or policies of its research sponsors.
2 - iii - PREFACE This draft is the interim report for a project in support of the Health Care Financing Administration s (HCFA) design, development, implementation, monitoring, and refining a Prospective Payment System (PPS) for inpatient rehabilitation. Such an inpatient rehabilitation facility PPS (IRF PPS) was mandated in the Balanced Budget Act of The research reported here was supported by HCFA through contract with RAND.
3 - v - CONTENTS PREFACE...iii FIGURES...ix TABLES...xi SUMMARY...xv Data and Methods...xv Classification System...xv Relative Weights...xvii Facility Adjustment...xviii Outliers...xix Simulated Payments Under Recommended System...xix Future Research...xix ACKNOWLEDGMENTS...xxi 1. INTRODUCTION...1 Background...1 Need to Improve Payment...2 Research Enabling an IRF PPS...3 Survey Instrument for Post Acute Care...4 Payment...4 Overview of Interim Report...6 Approach...6 Payment System Elements...7 Implementation Issues and Monitoring DATA AND METHODS...9 Data Sources...9 Case Mix Data...9 HCRIS Data...12 OACT File...13 Provider File...13 Utilization Data...13 Variable Definitions and Data Quality...14 Variables Used for Classification...14 Cost Per Case...16 Discharge Destination...17 Analysis Sample...21 Sample Size...21 Representativeness of Sample...23 Simulations...26 Payment for Groups of Hospitals...27 Payment for Groups of Patients...28 Accuracy at the Case Level...28 Accuracy at the Hospital Level...28 Financial Risk CASE CLASSIFICATION SYSTEM...31
4 - vi - Introduction...31 Data and Methods...32 Data Description...33 Modeling Methods...35 Evaluation of Old FRGs...36 Rehabilitation Impairment Categories...39 Resource-Based Partitions...44 Minimum Prediction Error Fits Using CART...44 Half-Sample Results...45 Full-Sample Results: Final Selection of RICs...49 Full-Sample Results: Final Selection of FRGs...53 Comorbidities...59 Major Comorbidity Variable...60 Improving the Comorbidity Variable UNUSUAL CASES...66 Issues Relating to Paying for Unusual Cases...66 Which Cases are Candidates for Special Payment...66 Payment Amount and Method...69 Descriptive Statistics for Transfer Cases...69 Analyses of the Cost of Transfer Cases...74 Interrupted Stays...76 Very Short Stay Cases...79 In-Hospital Death Cases...81 Implications for Payment...85 Payment for Transfer Cases...85 Bundling...86 Payment for Deaths and Atypical Short Stay Cases RELATIVE CASE WEIGHTS...89 Assumptions about Case Classification...89 Typical Cases...89 Atypical Cases...90 Bundling...90 Options for Calculation of Relative Weights...92 Resource Measure...93 Controlling for Hospital Costs...94 Fair Weights...95 Options Selected for Empirical Exploration...96 Algorithms...96 Estimating the Effect of Comorbidity...96 Adjustment for Comorbidity...98 HSRV Method for Relative Adjusted Weights...98 Standard Method for Relative Adjusted Weights...99 Relative Weights for CMG-Comorbidity Combinations...99 Measuring Compression...99 Results Effect of Comorbidity Weights Accuracy at the Case Level Accuracy at the Hospital Level Implications for Policy and Recommendations...108
5 - vii - 6. FACILITY LEVEL ADJUSTMENTS Overview of Methodology and Findings Establishing the Variables Used in the Analyses Cost Per Case Case Mix Index Wage Index Value Geographic Location Indirect Teaching Costs Low-Income Patients Other Factors Affecting Cost Methods: Multivariate Regression Analyses and Payment Simulations General Specification Issues Fully Specified Regression Payment Regressions Payment Simulations Analysis Results Characteristics of Facilities in Analysis File Preliminary Regressions Fully Specified Regressions Payment Regressions Payment Simulations Implications for Policy and Recommendations OUTLIERS AND SIMULATIONS Outliers Outlier Payment Formulas Simulation Parameters Outlier Cases Risk Accuracy at Case Level Accuracy at Hospital Level Outlier Payments and Weights Recommendation A More Detailed Classification System Patient Level Analysis Hospital Level Analysis Impact Analyses FUTURE RESEARCH Updating with Later Data Potential Modifications to the Classification System for Typical Cases Weights and Compression Theoretical Causes of Compression A First Cut at the Evidence Research Plans Updating Facility Level Adjustments Freestanding Hospitals Functional Improvement Additional Analyses of Recommended Facility Adjustments Representativeness of Sample Assessment Instrument...199
6 - viii - Some Differences Between the Instruments Data Collection Study Goals APPENDIX A. Additional Information Concerning Classification Alternative RIC Groupings CART Model APPENDIX B. Comorbidity Analyses Major Comorbidities Variables Found in the Fitting Data Set to Have Significant Effects on Costs Variables Which Do Not Substantially Increase Costs REFERENCES This is a kludge to fix a bug in MS Word. Don t delete it!
7 - ix - FIGURES 3.1 Average Cost in 1994 FRGs, 1994 Data Average Cost in 1994 FRGs, 1996 Data Average Cost in 1994 FRGs, 1997 Data Average FRG Cost Comparison, Analysis vs. Evaluation Samples HSRV Weights, With and Without Hospital Control in Comorbidity Regression Standardized Cost Weights vs. HSRV Weights (With Hospital Control in Comorbidity Regression) Standardized Charge Weights vs. HSRV Weights (With Hospital Control in Comorbidity Regression) Probability of Loss of 5 Percent or More, by Amount of Outlier Payment and Type of Hospital This is a kludge to fix a bug in MS Word. Don t delete it!
8 - xi - TABLES 2.1 Number of Rehabilitation Discharges and Facilities Number of Matched Discharges in Combinations of MEDPAR Discharge Destinations and FIM Discharge Setting Consistency of MEDPAR and FIM Instrument Discharge to SNF with Medicare Bill for SNF Stay Beginning Within One Day of Discharge Consistency of MEDPAR and FIM Instrument Discharge to Hospital with MEDPAR Bill for the Receiving Hospitalization Analysis Sample Size Percent of Inpatient Rehabilitation Discharge Universe in Samples, by Patient Characteristics Percent of Inpatient Rehabilitation Discharge Universe in Samples, by Hospital Characteristics Percent of Inpatient Rehabilitation Hospital Universe in Samples, by Hospital Characteristics MEDPAR/FIM Variables and Stages of Use Number of Linked MEDPAR/FIM Records R-squares for New and Old Data Initial Grouping of Impairment Group Codes into Rehabilitation Impairment Categories Candidate RIC Alternatives How R-square Grows as the Number of Nodes Increases, Half-Sample Results R-squares on Fitting and Evaluation Samples, Established RICs Performance of Suggested Alternative RICs: Old and New Values for Reclassified Cases, 1997 Data Final Grouping of Impairment Group Codes into Rehabilitation Impairment Categories How R-square Grows as the Number of Nodes Increases, Full Sample Results Number of Nodes in Various CART Alternatives RIC Definitions, Sample Sizes, and Number of Nodes (1997 Data) Recommended FRG Models: 92 Node Models Resulting from Recombination Regression of Log of Cost on Comorbidity Variables, Controlling for FRG2...62
9 - xii Effect of Individual Comorbidity Variables on Log Cost, Controlling for FRG Percent of Cases that are Transfers and Short Stay Transfers by Destination Type, Year, and Type of Rehabilitation Facility Percent of Cases that are Transfers and Short Stay Transfers by Destination Type, Year, and RIC Average LOS and Standardized Cost of Transfer Cases Compared to Typical Cases in the Same FRGC by Destination of Transfer Cases and Year Regressions of Cost of Short Stay Transfer Cases on Per Diem Payment and First Day Payment LOS, Standardized Cost and Payment, Under Bundled and Nonbundled Policies for First Two Parts of Interrupted Stay, as a Function of Length of Interruption Number and Percent of Cases With and Without FIM Assessment and With Each Discharge Destination, by LOS Average and Standard Deviation of Standardized Cost of Selected Very Short Stay Cases Death Rate by RIC and Comorbidity LOS and Standardized Cost of In-Hospital Deaths Compared to Typical Cases in the Same FRGC Standardized Cost of In-Hospital Deaths for Selected Partitions of Death Cases Sample Counts for Interrupted Stays (return within two days following discharge) Mean Cost to Charge Ratios for Ancillary Departments in Rehabilitation Facilities Effect of Comorbidity in Each RIC by Method of Control for Hospital Costliness Regression of Log of Standardized Cost of a Case on Log of Weight, by Weight Calculation Method Regression of Each Hospital's Log (average wage adjusted cost) on Log (case mix index) Typical LOS and Relative Weights for CMGs Comparison of DSH Ratio and Low-Income Ratio Size Categories Used in Regression Analysis Variable Means by Facility Characteristics Cost and Utilization by Geographic Location Fully Specified Regression on Case-weighted Cost Per Case Results of Regression Models 1 and
10 - xiii Results for Regression Models 3 and Results of Regression Models 5 and Results of Regression Models 7 and Comparison of Non-logged and Logged Payment Adjustment Payment Simulation Results for Selected Models Case- Weighted Payment-to-Cost Ratios Payment Impact by Low-Income Patient Ratio Base Model Payment Simulation Results Model 5B Payment Simulation Results Model 5A Payment Simulation Results Model 6B Payment Simulation Results Model 7B Payment Simulation Results Basic Statistics for Simulation Runs Cost and Payment for Outlier Cases in Each Outlier Policy Risk As A Function of Percent Outlier Payments Regression of Costs on Payment at Case Level, by Level of Outlier Payments Accuracy of Hospital-Level Payments, Root Mean Square Difference Between Payment and Cost and Mean Absolute Difference Between Payment and Cost, by Policy Payment to Cost Ratios for Hospital Classes, by Amount of Outlier Payment Outlier Payment Per Case for Hospital Classes, by Amount of Outlier Payment Outlier Payments and Payment to Cost Ratios by RIC and Presence of Comorbidities Under Alternative Outlier Policies Mean Absolute Deviation of PTC Ratio by RIC from 1, by Outlier Policy Payment Parameters, and Basic Statistics for Runs with More Detailed CMG Systems Average Cost Per Case and Payment to Cost Ratios for Patient Groups, by CMG System and Outlier Policy Mean Absolute Deviation of PTC Ratio by RIC from 1, by CMG System and Outlier Policy Regression of Costs on Payment at Case Level, by CMG System and Amount of Outlier Payment Risk Statistic for All Hospitals and Small Hospitals as a Function of the CMG Classification System and Percent Outlier Payments...186
11 - xiv Accuracy of Hospital Level Payments by CMG System and Outlier Policy Payment to Cost Ratios for Hospital Classes from the More Detailed CMGs, by Amount of Outlier Payments Impact of FY2001 IRF PPS Payment on Classes of Hospitals Mean Cost and Utilization Statistics for Hospitals Grouped by CMI Quartile A.1 Grouping of Impairment Group Codes into Rehabilitation Impairment Categories A.2 More Detailed FRG Model: 143 Node Models Resulting from CART B.1 Comorbidity Variables that Were Investigated B.2 Listing of Codes Removed as Unimportant, Vague, or Preventable B.3 List of Relevant Comorbidities with RIC Exclusions This is a kludge to fix a bug in MS Word. Don t delete it!
12 - xv - SUMMARY In the Balanced Budget Act of 1997, Congress mandated that the Health Care Financing Administration (HCFA) implement a Prospective Payment System (PPS) for inpatient rehabilitation. This interim report describes the research that RAND performed to support HCFA's initial efforts to design and develop such a PPS. It also discusses our plans for further research on the implementation, monitoring, and refinement of such an Inpatient Rehabilitation Facility PPS (IRF PPS). Data and Methods In this report, we analyze a variety of options for elements of the IRF PPS including the patient classification system, the methodology for calculating relative weights, the facility payment adjustment factor, and outlier policy. We evaluate these options in terms of: (1) how well payment explains cost at the level of patient and hospital, (2) the Payment to Cost (PTC) ratios for patient groups and hospital groups, and (3) financial risk to hospitals. We used hospital cost reports, discharge abstracts, and functional independence measure (FIM) data for Medicare discharges in years 1996 and The FIM data come from the Uniform Data System for medical rehabilitation (UDSmr) and from the Clinical Outcomes Systems (COS) data for medical rehabilitation. Our sample covers about half of all IRF Medicare patients in each of those years. We use the departmental method to estimate the accounting cost of each case in the sample. Classification System The unit of payment in the IRF PPS will be the hospital stay, beginning with an admission to the rehabilitation hospital or unit and ending with discharge from that facility. Each stay will be classified into a Case Mix Group or CMG. We define typical cases as cases that are in the hospital for more than 3 days and that are discharged to the community. We use the Function-Related Groups (FRG) methodology, developed by Dr. Margaret Stineman and others to assign typical cases to CMGs. We validated this methodology by showing that the FRGs which we
13 - xvi - created in a previous study explain costs in our new data as well as they had in the earlier study. As the first step in the creation of new FRGs, codes for the impairment that is the primary cause of the hospitalization are grouped into larger categories called Rehabilitation Impairment Categories (RICs). We examined a series of options for defining RICs. We found that most options did not improve on the groupings used in the published definitions for FRGs in their ability to explain costs. Consequently we use RIC definitions that differ from previously published research primarily in the creation of a new RIC for burns. We use Classification and Regression Trees to iteratively partition patients in each RIC based on their the FIM data and age. Each partition maximizes the variation in the log of case costs that is explained. We explored various stopping rules for the iteration and recommend the use of one which groups typical cases into 92 groups. We show that payment using this set of groups performs just as well as payment using a more detailed set of 143 groups. Many of these groups have their payment amount modified if the case has one or more of a specified set of comorbidities. We began with the comorbidity model which we developed earlier. We scrubbed this model to eliminate certain diagnoses from certain RICs and added several conditions to the relevant comorbidity list. Finally, the set of ICD-9- CM diagnoses that we found to affect costs were examined to eliminate codes believed to have only a minor effect on resources, codes that were vague enough that they might encourage upcoding, and codes that were for conditions that could be prevented by prudent treatment. The FRGCs are the basis for the CMGs, but we need to add new groups for the atypical cases or specify rules for paying them. About 21 percent of cases were transferred either to a hospital or to a skilled nursing facility or nursing home. About two-thirds of the transfer cases are short stay transfers--i.e., they stayed less than the average LOS for typical cases in the CMG to which they would be assigned based on their primary impairment, age, FIM, and comorbidities. If short stay transfer cases were to receive a full case payment, most would be substantially overpaid relative to typical cases. The average PTC ratio for short stay transfer cases would be about 1.8. The potential profit from these cases might provide incentives for abuse,
14 - xvii - with some hospitals transferring cases to reduce their costs and increase Medicare payments, or even admitting patients who are not able to sustain the required therapy. Choosing an appropriate payment policy requires balancing a reduction in these incentives against the need to provide adequate funding for, and access to, all appropriate care. We show that paying short stay transfer cases a per diem amount equal to the per diem for the typical case in the same CMG will result in payments that are only slightly under the cost of the these cases and we recommend this or a similar policy that would add a one-half day per diem. HCFA might also bundle the payment for more than one hospital stay when the patient returns to the same hospital within a short period of time. We recommend against bundling because such bundled cases would be paid substantially less than their costs. Less than half of one percent of cases die in the rehabilitation hospital. On average these cases cost substantially less than typical cases in the same CMG, so it is reasonable to create a special group for these cases. Splitting the death group by whether or not the patient was in an orthopedic RIC and whether or not the patient stayed longer than the average death case would further increase the accuracy of the payment system. The remaining atypical cases are the 2.9 percent of cases that stay less than 3 days. We recommend creating a special group for these cases. Relative Weights We empirically analyzed the following options for calculating relative weights for the CMGs: cost-based hospital specific relative value (HSRV) weights, cost-based standard weights, and charge-based standard weights. The HSRV weights use each hospital's own costs to standardize costs; the standard method uses the facility payment adjustment to standardize costs. We found that controlling for hospital costs using individual hospital identity results in estimates of the effect of comorbidity that are more precise than using either standardized cost or standardized charges. The HSRV method appears to result in more accurate estimates of relative cost at the case level. However, the HSRV weights and the standard method cost weights (and probably the standard method charge
15 - xviii - weights) are compressed at the hospital level--costs increase more quickly than the case mix indices increase. Hospitals systematically vary in their costliness in ways beyond that which is accounted for in the payment adjustment. Because the HSRV method accounts for these variations in costliness and because it measures the effect of comorbidity better, we believe that its results are more accurate measures of the relative resource use of each CMG. But there are reasons to believe that hospital cost per case averages out certain errors in the patient level cost estimates. We present our plan to improve case cost estimates and to otherwise reduce the compression in the weights. If this is successful, we believe that the HSRV algorithm should be used to calculate weights in the IRF PPS. Facility Adjustment We explore facility-level adjustments to the standard payment amounts that may account for cost differences that are beyond the control of facility management and for which it may be appropriate to pay. These include the area wage index, an adjustment for rehabilitation facilities in Alaska and Hawaii, location in a large urban or rural area, the indirect costs of graduate medical education, and serving low-income patients. We explored different formula for some factors and used regression analysis to examine whether each factor explains cost. We use a pre-reclassification hospital wage index that excludes 100% of wages for services provided by teaching physicians, interns and residents, and non-physician anesthetists under Part B. We found that an adjustment based on the labor-related share for area wage differences explains hospital costs as well as other alternatives. When cost per case is standardized for case mix and area wage differences, rural hospitals are almost 16 percent more costly than other hospitals. This suggests that an additional payment or special payment protections may be appropriate for rural facilities. We explored two measures of teaching activity. However, we found that neither significantly explains costs in a payment regression. We also used 2 measures to describe the extent to which each hospital serves low-income patients--the disproportionate share formula used in the acute PPS and the percentage of patients who are low-income,
16 - xix - which seems more logically grounded. However we find that both formula predict costs. There is about a 9 percent increase for each 10 point increase in a facility s low-income or DSH patient percentage. This suggests an additional payment may be appropriate for hospitals that serve low-income patients. Outliers We used simulation to analyze the effect of different levels of outlier payments. The conversion factor for each simulation was set so that average payment per case was within 1 dollar of cost per case. The amount of outlier payments must be arrived at from a tradeoff between reducing risk and improving fairness in the system against unwanted gaming with charges and/or unnecessary services. We find that outlier payments in the RPPS affect a substantially higher proportion of patients than they do in the acute PPS for the same percentage of outlier payments. This increases the opportunities to benefit from gaming. Further, we found that the rate at which the benefits of outlier policy increased declined with an increasing amount of outlier payments. Thus we recommend limiting the amount of outlier payment to 3 percent of total payments, below the statutory maximum of 5 percent. Input from hospitals on this tradeoff will be very useful. Simulated Payments Under Recommended System The simulated payment from the recommended system explains 62.7 percent of the variance in patient level costs (dollar scale). The PTC ratios for groups of patients defined by sex, age, marital status, and RIC are all close to 1--typically within 2 percent of 1. The log of payment explains 57.8 percent of the variance in log cost at the hospital level. The PTC ratios for most groups of hospitals are close to 1. However, the PTC ratio for the small number of freestanding hospitals with an average daily census of less than 25 is The 25 percent of hospitals with the highest case mix index have a payment to cost ratio of 0.966, reflecting compression in the weights. Future Research In the remainder of this project, we will address several issues that might affect the initial implementation of the IRF PPS and also
17 - xx - work on longer range issues of monitoring and refining the system. We describe our plans for: updating our analyses with later data; investigating and, if possible, eliminating compression; compensating to the extent possible for the non-representativeness of our sample; and comparing the MDS-PAC and FIM data collection instruments.
18 - xxi - ACKNOWLEDGMENTS We thank our HCFA project officer, Carolyn Rimes, for her continued support throughout the project and for her rapid response to our requests for data and review of this draft report. She also arranged frequent, very helpful telephone conversations with various HCFA staff. We would particularly like to thank Nora Hoban and Robert Kuhl for their willing participation in these calls which helped us understand HCFA's analyses needs and HCFA's data. We also thank Joan Buchanan, a RAND consultant who is with Harvard University for her review of an earlier version of this report. We thank Dr. Margaret Stineman of the University of Pennsylvania for helpful discussions concerning impairment groups and comorbidities. We also thank Dr. David Zingmond of the University of California at Los Angeles for helpful suggestions concerning comorbidity. We also thank Carl Granger of UDSmr and Jill Engholm of Caredata.com for the use of their data and for their help in data interpretation. An earlier draft of this report was reviewed at a meeting of a Technical Expert Panel (TEP) which was held in Santa Monica, California on May 30 and 31, The TEP members provided many helpful comments on our work. We thank each of the TEP members who are listed below for their help at the meeting and look forward to working with them more closely during the rest of the project. We revised the future research plans reported in Chapter 8 in response to these comments, and added a few needed qualifications throughout the report. It was not possible, however, to accommodate both our schedule and all their comments. Thus, the deficits in this report are solely the responsibility of the authors.
19 - xxii - Members of TEP on Inpatient Rehabilitation Facility Prospective Payment System Ken Aitchison Kessler Institute for Rehabilitation Joan August Cedars Sinai Medical Center James Ball Catholic Health Services Jean Davis Health South Corp. Susan Dean-Baar University of Wisconsin Frank Gainer Greater Southeast Community Hospital Norbert Goldfield 3MHIS Stuart Guterman The Urban Institute Catherine Hawes* Hawes-Myers Research Institute Kurt Hoppe Iowa Health System Brad Hutchins Oral Health America Alan Jette Boston University Robert Kane University of Minnesota Sally Kaplan MedPAC Richard Linn State University of New York John Melvin Moss Rehabilitation Group John Morris Hebrew Rehabilitation Center for Aged Research and Training Institute Elliot Roth Northwestern University Medical School Barry Smith Baylor Health Systems Margaret Stineman University of Pennsylvania Carolyn Zollar AMRPA * Ms. Hawes was unable to attend the Santa Monica meeting.
20 INTRODUCTION BACKGROUND In the Balanced Budget Act of 1997 (BBA), Congress mandated that the Health Care Financing Administration (HCFA) implement a Prospective Payment System (PPS) for inpatient rehabilitation. This interim report describes the research that RAND performed to support HCFA's initial efforts to design and develop such a PPS. It also discusses our plans to update this research and for further research on the implementation, monitoring, and refinement of such a PPS. This new PPS will apply to rehabilitation hospitals and to distinct rehabilitation units of acute care hospitals that were excluded from the acute PPS. In order to qualify for such an exclusion the rehabilitation facility must meet two conditions. First, Medicare patients must receive intensive therapy (generally at least three hours per day). Second, 75 percent of all patients must have one of 10 specified problems related to neurological or musculoskeletal disorders or burns. We call this PPS the Inpatient Rehabilitation Facility PPS or (IRF PPS). Payment for inpatient care of Medicare beneficiaries given in a rehabilitation facility is currently made under the Tax Equity and Fiscal Responsibility Act (TEFRA) of The payment amount depends on a per-case target amount that is calculated from historical costs at the facility trended forward and on the hospital s actual cost per case. Under TEFRA, there is no adjustment for changes in a hospital s case mix and new hospitals were able to obtain larger payments than existing hospitals. The BBA introduced interim changes to the payment system designed to reduce HCFA s costs and to mitigate the advantage that new hospitals had under the TEFRA payment system. In particular, limits were set on the payment rate for new hospitals and separate maximum payment limits for all hospitals were created. In addition, hospitals that were receiving Medicare payments prior to FY 1990 were allowed to request rebasing of their target amounts.
21 - 2 - Need to Improve Payment Technological changes in the process of care, greater availability of post acute care, and financial incentives for acute hospitals to release patients rapidly combined to cause rapid growth in Medicare payments for all forms of post acute care, including rehabilitation. The number of Medicare beneficiaries served by Skilled Nursing Facilities (SNFs) grew by 94 percent from 1990 to 1995, Medicare beneficiaries served by Home Health Agencies by 78 percent, and the number of Medicare discharges from rehabilitation facilities by 67 percent. (MedPAC, July 1998, Charts 4-3, 4-8, and 4-17). Acute hospitals, paid under the acute PPS, find it advantageous to transfer patients to a different setting as soon as possible. Probably affected by both PPS and TEFRA incentives, the number of rehabilitation hospitals and units increased 4.1 percent annually during (MedPAC, July 1998). By FY 1996, 23 percent of acute PPS discharges used post acute care within one day of discharge and 2.8 percent went to a rehabilitation facility. Although rehabilitation facility payments from Medicare were substantially less than costs in the early 1990s, the ratio of aggregate Medicare payments to cost increased rapidly during the 1990's. By 1995 payments exceeded costs by 7 percent for free-standing rehabilitation hospitals and by 4 percent in rehabilitation units. (MedPAC, July 1998, Chart 4.17). This improved position was driven, at least in part, by reduced costs associated with a decline in length of stay (LOS) for rehabilitation patients. In addition to TEFRA s inability to control costs, it also may hinder access to care. The lack of a case mix adjustment in TEFRA creates incentives for providers to specialize in relatively less expensive cases, which could conceivably limit beneficiary access. Further, TEFRA lacks outlier payments that help to mitigate the acute PPS s incentives to under serve the most expensive patients and that provide substantial protection to providers against financial risk (Keeler, Carter, and Trude, 1988). Additional distortion of case-level payments occurs when TEFRA counts discharges that do not include a full course of rehabilitation (e.g., short stays for evaluation, transfer cases) as full cases. These distortions may have affected hospital behavior (Chan and Ciol, 2000).
R Analyses for the Initial Implementation of the Inpatient Rehabilitation Facility Prospective Payment System Grace M. Carter, Melinda Beeuwkes Buntin, Orla Hayden, Jennifer Kawata, Susan M. Paddock, Daniel
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