• Youngmin Kwon, Marcelo C Perraillon, Coleman Drake, Bruce L Jacobs, Cathy J Bradley, and Lindsay M Sabik.
• University of Pittsburgh School of Public Health, A610 Public Health, 130 DeSoto St, Pittsburgh, PA 15261. Email: yok84@pitt.edu.
• Am J Manag Care. 2023 Sep 1; 29 (9): 455462455-462.

ObjectivesTo determine agreement between variables capturing the primary payer at cancer diagnosis across the Pennsylvania Cancer Registry (PCR) and statewide facility discharge records (Pennsylvania Health Care Cost Containment Council [PHC4]) for adults younger than 65 years, and to specifically examine factors associated with misclassification of Medicaid status in the registry given the role of managed care.Study DesignCross-sectional analysis of the primary cancer cases among adults aged 21 to 64 years in the PCR from 2010 to 2016 linked to the PHC4 facility visit records.MethodsWe assessed agreement of payer at diagnosis (Medicare, Medicaid, private, other, uninsured, unknown) across data sources, including positive predictive value (PPV) and sensitivity, using the PHC4 records as the gold standard. The probability of misclassifying Medicaid in registry was estimated using multivariate logit models.ResultsAgreement of payers was high for private insurance (PPV, 89.7%; sensitivity, 83.6%), but there was misclassification and/or underreporting of Medicaid in the registry (PPV, 80%; sensitivity, 58%). Among cases with "other" and "unknown" insurance, 73.8% and 62.1%, respectively, had private insurance according to the PHC4 records. Medicaid managed care was associated with a statistically significant increase of 12.6 percentage points (95% CI, 9.4-15.8) in the probability of misclassifying Medicaid enrollment as private insurance in the registry.ConclusionsFindings suggest caution in conducting and interpreting research using insurance variables in cancer registries.

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