How do Medicaid, Medicare, and Commercial Insurance Vary in. Community-Level Performance?

Transcription

1 How do Medicaid, Medicare, and Commercial Insurance Vary in Community-Level Performance? Using Claims Data from the Wisconsin Health Information Organization (WHIO) to Assess Variation in Population Health Processes November WARF Building, 610 Walnut Street Madison, Wisconsin Prepared by Donna Friedsam, MPH Daphne Kuo, PhD Kristen Voskuil, MA

2 Background The Wisconsin Health Information Organization (WHIO) received Medicare data from the Dartmouth Atlas/Brookings Institute collaboration, with support from the Markel Foundation, to support its understanding of variation among various markets in payer performance. The conducted various exploratory analyses to determine the utility of the Medicare data provided in aggregate at the county level. Specifically, the used the data provided by both Dartmouth (Medicare) and Ingenix (Commercial and Medicaid) to assess the payers performance along various parameters. 1. By County, along process measures for diabetes quality: HbA1c, LDL annual, annual retinopathy exam. 2. For three service areas participating in pilot projects for the Partnership for Health Care Payment Reform (PHPR): Three process measures and the composite measure, by payer and for all payers. 3. Correlation between various county-level WHIO measures for Health Utilization and the z-score of county in the Institute s annual County Health Ranking. The measures of health utilization tested are as follows: Admits per 1,000: Medical, Surgical, ASC, All visits IP days per 1,000: Medical, Surgical, ASC, all visits Emergency Department: Avoidable ED per 100, for all diagnoses Avoidable ED per 100, for primary diagnoses ED payment per day, allowed charge ED payment per day, CMS payment # of ED days per 100, no IP admissions days # of ED days per 100, with IP admission days Sources of WHIO Data WHIO was formed in 2005 to serve as a data warehouse for resource use information. Most large insurance companies in the state, along with the Wisconsin Medicaid program, now submit de-identified health insurance claims data to WHIO. The WHIO DataMart Version 5, on which this report is based, includes data submitted by the following contributors: WPS Health Insurance Corp., WEA Trust Insurance, Humana, Anthem, United Healthcare of Wisconsin, State of Wisconsin Medicaid (FFS and HMO), Gundersen Lutheran Health Plan, Dean Health Plan, Security Health Plan, MercyCare Health Plan, Group Health Cooperative of South Central Wisconsin, Network Health Plan, and Physicians Plus Insurance Corporation. Combined, this data represents claims from more than 3.7 million Wisconsin residents. Both the WHIO and Medicare datasets include only health insurance claims data. They should generally reflect services delivered to the patient, but are susceptible to any irregularities that may accompany coding and billing process. Page 1 of 25

3 1. Diabetes Process Measures by County Tables 1a below lists, by county the percent of persons in each payer group receiving the recommended tests HbA1c and LDL tests and the difference in rates between the payers Commercial, Medicaid, and Medicare. The percentage differences that have an asterisk indicate a statistically significant difference in performance between the two payers. For nearly all counties, Medicaid shows significantly lower performance than Commercial and Medicare in these counties. Medicaid statewide performs approximately 35% lower than Commercial and Medicare on LDL testing. Medicaid statewide performs approximately 30% lower than Commercial and Medicare on HbA1c testing. The performance of Commercial and Medicare are statistically similar in most counties, except In Jefferson, Juneau, Kenosha, Racine and Sauk Counties, Medicare performance for LDL testing significantly outpaces Commercial payer performance. In Kenosha, Racine, and Sauk Counties, Medicare performance of HbA1c testing significantly outpaces Commercial payer performance. The Bar Charts 1a-1c illustrate, by payer (COM, MCR, MCD), each county variation from the county mean for HbA1c and LdL testing. Those bars extending beyond the zone of standard deviation indicate performance either significantly above or significantly below the mean for all counties on that performance measure. The maps 1a-1d that follow illustrate the variation by county in performance of these diabetes tests HbA1c, LDL, and retinopathy on a composite all-payer basis (Commercial, Medicare, and Medicaid). The all-payer composite performance rates reflected in the maps are weighted to adjust for varying composition of payer groups in each county. That allows the performance rates to compare actual overall delivery system performance rather than reflecting simply the relative predominance of, for example, Medicare (which generally has higher performance). In other words, the weighted rate indicates the performance as if each county had the statewide standard percentage of payers for each process measure (HbA1c, LDL, eye exam), as indicated by Table 1b. Table 1b. Distribution of Payers, Statewide, within each Diabetes Process Measure Payer HbA1c LDL Eye Exam Commercial Medicaid Medicare Total Page 2 of 25

4 Table 1a: Percent of persons, by county and payer group receiving HbA1c and LDL tests and the difference in rates between the payers Commercial, Medicaid, and Medicare Page 3 of 25

5 Map 1a: Page 4 of 25

6 Map 1b: Page 5 of 25

7 Map 1c: Page 6 of 25

8 Map 1d: Page 7 of 25

9 Variation from the Overall County Mean, by Payer The Bar Charts 1a-1c illustrate, by payer (COM, MCR, MCD), each county variation from the county mean for HbA1c and LdL testing. Those bars extending beyond the zone of standard deviation indicate performance either significantly above or significantly below the mean for all counties on that performance measure. The Table 1c, below, lists counties performing outside the bounds of one standard deviation above (better) or below (worse) than the overall mean of all counties. Table 1c. County Performance Relative to Overall Mean for All Counties, Medicaid Counties Performing Above Overall County Mean for Medicaid HbA1c (County Mean = 59%) LDL (County Mean = 47%) Door Door Langlade Langlade Milwaukee Richland Oneida Shawano Polk Portage Price Richland Waushara Counties Performing Below Overall County Mean for Medicaid HbA1c (County Mean = 59%) LDL (County Mean = 47%) Green Green Iowa Green Lake Kenosha Iowa LaCrosse Jackson Monroe LaCrosse Sauk Monroe Sheboygan Sauk Trempeleau Trempeleau Vernon Page 8 of 25

10 Bar Charts 1a: Page 9 of 25

11 Bar Chart 1b: Page 10 of 25

12 Bar Chart 1c: Page 11 of 25

13 2. Payment Reform Service Areas Three service areas are participating in the pilot projects for the Partnership for Health Care Payment Reform (PHPR). These service areas are defined in two levels: 1) Counties named by the providers participating in the PHPR, and 2) as derived from the zip codes associated with the Hospital Service Area within the Dartmouth Atlas. In the former case, while these provides may have a presence in these counties (and thus consider them part of their service area), they do not have a significant geographic or market share in many of them. So these providers services will not move the population-level (county-level) data for those counties where they do not care for a significant percentage of the population. For this reason, the data were also analyzed using the Dartmouth Atlas more narrow service area. The population for HSA zip code, within each county, was aggregated to determine the share of the population in each county attributed to that HSA. Counties were only included in the service area if a predominant portion of the overall county population could be assigned to the HSA for that provider. Table 2a, below, shows the percent of the population that can be attributed to the HSAs for provider systems HVN and Monroe Clinic. (This analysis was not run for Milwaukee IPN because the specific providers were not designated. ) Table 2a NEWHVN County Total in Total County Population Service Area % Service Area of County Brown 249, , % Door 2,656 27,765 10% Kewaunee 12,829 20,594 62% Manitowoc ,406 0% Marinette ,719 7% Oconto 32,043 37,723 85% Outagamie 4, ,455 3% Shawano ,954 2% Monroe Clinic* County Total in Service Area Total County Population Service Area % of County Green 36,884 36, % La Fayette 4,246 16,880 25% * Monroe Clinic s service of Stephenson County, Illinois is not included because we did not receive Medicare or WHIO data about that area. Also, Monroe Clinic did not indicate LaFayette County within its service area. However, Dartmouth Atlas shows 25% of the county is in the Monroe Clinic HSA. We were not able to provide the service data because LaFayette County was not included in the data we received from Dartmouth or Ingenix (that data only had 58 counties.) Page 12 of 25

14 These two methods resulted in the following service areas, with the more narrow HSA-derived service area in bold: NEWHVN: Brown, Calumet, Kewaunee, Oconto, Outagamie, Shawano, Waupaca, Waushara,Winnebago Milwaukee IPN: Milwaukee, Kenosha, Ozaukee, Racine, Waukesha Monroe Clinic: Green County Tables 2c,d, and e list, by narrow and wide service area, the percent of persons in each payer group Commercial, Medicaid, and Medicare-- receiving the recommended tests HbA1c, LDL, retinopathy tests, and the composite score for receipt of all three tests. The final all-payer rates, in Table 2f, are weighted to adjust for varying composition of payer groups in each service area. That allows the rates to compare actual overall provider performance rather than simply the relative predominance of, for example, Medicare (which generally has higher performance). In other words, the weighted rate indicates the performance against a standardized percentage of payers, as indicated by the Adjustment Factors Table 2b, below. Table 2b: Adjustment Factors, Percent of Claims by Payer for Each Service, Statewide % N % N % N % N All Three All Svcs HBa1c HBa1c LDL LDL Eye Exam Eye Exam Statewide 216, , , ,731 COM 17% 37,401 18% 32,663 18% 30,093 11% 14,701 MCD 15% 32,086 11% 19,497 9% 15,731 11% 14,632 MCR 68% 146,815 71% 129,231 72% 120,159 78% 104, % 216, % 181, % 165, % 133,731 Commercial: o Both NEWHVN and Monroe exceed the all payer individual test rates and composite rate. o Milwaukee trails the statewide rate for each individual test rate and for the composite rate. Medicaid: o Monroe substantial trails the statewide rate for HbA1c and LDL testing and for the composite rate All Payer: o Only minor variations appear in the comparison of service area all-payer rates to the statewide rates, particularly once the service area rates are weighted to correct for differing payer composition among the population. Page 13 of 25

15 Tables 2c-f. Summary of Quality Measure Compliance for Selected Diabetes Measures, By County and Product Category, Year Ending 9/30/2009, Patients within last 12 months. Table 2c: Commercial HbA1c LDL Eye exam All Tests Composite PRODUCT COUNTY DEN (N) NUM Rate NUM Rate NUM Rate Rate COM Oconto % % 70 35% 70% COM Kewaunee % % 46 37% 73% COM NEWHVN 1,454 1,322 91% 1, % 72% COM Calumet % % % 74% COM Outagamie % % % 75% COM Shawano % % 88 41% 74% COM Waupaca % % % 79% COM Waushara % % 57 41% 74% COM Winnebago % % % 76% COM NEWHVN-out 2,648 2,444 92% 2, ,233 47% 76% COM NEWHVN-TOTAL 4,102 3,766 92% 3, ,865 45% 74% COM Milwaukee 6,801 5,851 86% 5,387 79% 2,532 37% 67% COM Waukesha 2,839 2,475 87% 2,287 81% 1,161 41% 70% COM IPN 9,640 8,326 86% 7, ,693 38% 68% COM Kenosha % % % 58% COM Ozaukee % % % 69% COM Racine 1, % % % 57% COM IPN-out 2,831 2,177 77% 2, % 60% COM IPN-TOTAL 12,471 10,503 84% 9, ,572 37% 66% COM Green/Monroe % % % 76% COM Statewide 37,401 32,663 87% 30,093 80% 14,701 39% 69% Page 14 of 25

16 Table 2d: Medicaid HbA1c LDL Eye exam All Tests Composite PRODUCT COUNTY DEN (N) NUM Rate NUM Rate NUM Rate Rate MCD Oconto % 97 53% 76 41% 52% MCD Kewaunee % 34 43% 33 41% 47% MCD NEWHVN 1, % % % MCD Calumet % % % 50% MCD Outagamie % % % 53% MCD Shawano % % 95 44% 56% MCD Waupaca % % % 51% MCD Waushara % 91 52% 92 53% 58% MCD Winnebago % % % 50% MCD NEWHVN-out 2,125 1,262 59% 1,081 51% % MCD NEWHVN-TOTAL 3,663 2,194 60% 1,878 51% 1, % MCD Milwaukee 10,891 7,332 67% 5,783 53% 4,364 40% 53% MCD Waukesha % % % 49% MCD IPN 11,647 7,755 67% 6,137 53% 4,702 40% 53% MCD Kenosha % % % 44% MCD Ozaukee % 80 49% 59 36% 49% MCD Racine 1, % % % 46% MCD IPN-out 2,225 1,175 53% 1,023 46% % MCD IPN-TOTAL 13,872 8,930 64% 7,160 52% 5, % MCD Green/Monroe % 61 40% 86 56% 47% MCD Statewide` 32,086 19,497 61% 15,731 49% 14,632 46% 52% Page 15 of 25

17 Table 2e: Medicare HbA1c LDL Eye exam All Tests Composite Product County DEN (N) NUM Rate NUM Rate NUM Rate Rate MCR Brown 5,410 4, , , % MCR Oconto 1,350 1, , % MCR Kewaunee % MCR NEWHVN 7,365 6,442 87% 5,940 81% 5,320 72% 80% MCR Calumet % MCR Outagamie 3,530 3, , , % MCR Shawano 1, % MCR Waupaca 1,770 1, , , % MCR Waushara 1,225 1, % MCR Winnebago 3,270 2, , , % MCR NEWHVN-out 11,445 10,105 88% 9,695 85% 8,294 72% 82% NEWHVN- MCR TOTAL 18,810 16,548 88% 15,635 83% 13,614 72% 81% MCR Milwaukee 26,910 23, , , % MCR Waukesha 9,270 8, , , % MCR IPN 36,180 31,214 86% 29,057 80% 24,630 68% 78% MCR Kenosha 4,660 4, , , % MCR Ozaukee 2,185 1, , , % MCR Racine 6,310 5, , , % MCR IPN-out 13,155 11,455 87% 10,850 82% 8,577 65% 78% MCR IPN-TOTAL 49,335 42,669 86% 39,907 81% 33,207 67% 78% MCR Green 1,240 1, , % MCR Statewide 146, ,231 88% 120,159 82% 104,398 71% 80% Page 16 of 25

18 Table 2f: All Payers Composite HbA1c LdL Eye exam All Tests Composite County Den (N) Num Rate Weighted NUM Rate Weighted NUM Rate Weighted Rate Weighted Brown 7,816 6,578 84% 86% 5,988 77% 78% 5,152 66% 68% 76% 76% Oconto 1,733 1,439 83% 83% 1,316 76% 76% 1,061 61% 61% 73% 72% Kewaunee % 84% % 79% % 57% 73% 72% NEWHVN 10,357 8,696 84% 85% 7,945 77% 78% 6,666 64% 66% 75% 75% Calumet 1,299 1,038 80% 84% % 81% % 67% 71% 75% Outagamie 4,867 4,286 88% 88% 4,061 83% 83% 3,299 68% 69% 80% 78% Shawano 1,552 1,333 86% 87% 1,260 81% 82% % 65% 77% 76% Waupaca 2,422 2,056 85% 85% 2,066 85% 85% 1,699 70% 71% 80% 79% Waushara 1,539 1,285 84% 85% 1,132 74% 74% % 60% 73% 72% Winnebago 4,539 3,813 84% 85% 3,598 79% 80% 2,849 63% 64% 75% 75% NEWHVNout 16,218 13,811 85% 86% 13,101 81% 81% 10,517 65% 67% 77% 76% NEWHVN- TOTAL 26,575 22,508 85% 86% 21,046 79% 80% 17,183 65% 67% 76% 76% Milwaukee 44,602 36,247 81% 84% 32,443 73% 76% 24,651 55% 60% 70% 72% Waukesha 12,865 11,048 86% 84% 10,425 81% 79% 8,374 65% 67% 77% 75% IPN 57,467 47,295 82% 84% 42,868 75% 77% 33,025 57% 62% 71% 73% Kenosha 6,410 5,141 80% 81% 4,969 78% 78% 3,499 55% 56% 71% 70% Ozaukee 3,066 2,632 86% 84% 2,438 80% 78% 1,911 62% 64% 76% 74% Racine 8,735 7,034 81% 81% 6,521 75% 75% 4,869 56% 58% 70% 69% IPN-out 18,211 14,807 81% 81% 13,928 76% 77% 10,278 56% 58% 71% 70% IPN-TOTAL 75,678 62,102 82% 84% 56,796 75% 77% 43,303 57% 61% 71% 72% WI, Green 1,692 1,477 87% 86% 1,410 83% 82% 1,040 61% 62% 77% 75% Statewide 216, ,391 84% 85% 165,983 77% 78% 133,731 62% 65% 74% 74% Page 17 of 25

19 3. Correlation between WHIO measures and County Health Ranking The correction was tested between various county-level WHIO measures for Health Utilization and the z-score of county in the Institute s annual County Health Ranking. (Table 3 and Figures 3a-h) WHIO measures of health utilization tested are as follows: Admits per 1,000: Medical, Surgical, ASC, All visits IP days per 1,000: Medical, Surgical, ASC, all visits Outpatient visits per 100: Primary care, Specialist, Total Emergency Department: Avoidable ED per 100, for all diagnoses Avoidable ED per 100, for primary diagnoses ED payment per day, allowed charge ED payment per day, CMS payment # of ED days per 100, no IP admissions days # of ED days per 100, with IP admission days The CHR provides two sets of rankings: Factors and Outcomes. Factors z-score rolls up data on health behaviors, clinical care, social and economic, and the physical environment. Outcomes z-score rolls up data on how long people live (mortality) and how healthy people feel (morbidity). These include premature death, birth outcomes, and health-related quality of life indices. It is important to note that the CHRs use some Dartmouth Atlas elements as part of Factors z-score. The rankings use of the Dartmouth Medicare data, and their percentage contribution to the overall ranking are as follows: HbA1c testing (2.5%) and hospitalizations for Ambulatory Care Sensitive Conditions (5%). With this context, a note: These correlations appear to serve as a validation exercise rather than providing value-added information that can lead to action. There is no genuinely independent variable here: The WHIO/Dartmouth utilization measures are a function of community health factors (many of which are measured with the CHR), while the CHR ranking includes utilization in their scoring algorithm. Consistent and statistically significant correlation was found between the following WHIO quality parameters and the county health ranking (z-score) for both Factors and Outcomes, for the following measures: Hospital admissions for Ambulatory Care Sensitive Conditions (per 1,000 population) Inpatient days for Ambulatory Care Sensitive Conditions (per 1,000 population) ED payment per day allowed charge ED payment per day CMS payment # of ED days, no IP admission days (per 100 population) # of ED days with IP admission days (per 100 population) Correlation was also found with the CHR Factors ranking, but not the Outcomes Ranking, for the following: Avoidable ED visits for primary diagnosis (rate per 100 population) Outpatient Visits to Specialist (Rate per 100 population) Medical and all hospital admissions (rate per 1,000 population) Page 18 of 25

20 Table 3 Page 19 of 25

21 Figure 3a Figure 3b Page 20 of 25

22 Figure 3c Figure 3d Page 21 of 25

23 Figure 3e Figure 3f Page 22 of 25

24 Figure 3g Figure 3h Page 23 of 25

25 This Page Intentionally Blank Page 24 of 25