Sample Selection for Medicare Risk Adjustment Due to Systematically Missing Data.

Abstract:

OBJECTIVE:To assess the issue of nonrepresentative sampling in Medicare Advantage (MA) risk adjustment. DATA SOURCES:Medicare enrollment and claims data from 2008 to 2011. DATA EXTRACTION:Risk adjustment predictor variables were created from 2008 to 2010 Part A and B claims and the Medicare Beneficiary Summary File. Spending is based on 2009-2011 Part A and B, Durable Medical Equipment, and Home Health Agency claims files. STUDY DESIGN:A propensity-score matched sample of Traditional Medicare (TM) beneficiaries who resembled MA enrollees was created. Risk adjustment formulas were estimated using multiple techniques, and performance was evaluated based on R2 , predictive ratios, and formula coefficients in the matched sample and a random sample of TM beneficiaries. PRINCIPAL FINDINGS:Matching improved balance on observables, but performance metrics were similar when comparing risk adjustment formula results fit on and evaluated in the matched sample versus fit on the random sample and evaluated in the matched sample. CONCLUSIONS:Fitting MA risk adjustment formulas on a random sample versus a matched sample yields little difference in MA plan payments. This does not rule out potential improvements via the matching method should reliable MA encounter data and additional variables become available for risk adjustment.

journal_name

Health Serv Res

journal_title

Health services research

authors

Bergquist SL,McGuire TG,Layton TJ,Rose S

doi

10.1111/1475-6773.13046

subject

Has Abstract

pub_date

2018-12-01 00:00:00

pages

4204-4223

issue

6

eissn

0017-9124

issn

1475-6773

journal_volume

53

pub_type

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