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Reviewed byPlaininsurer Editorial, Insurance Editorial Team

Data sources

Plaininsurer synthesizes data from these public-domain federal sources:

CMS (Centers for Medicare & Medicaid Services) — data.cms.gov
Data.gov — data.gov

PlainInsurer

Insurance company complaint ratios, claim denial rates, and reputation grades — sourced from NAIC and CMS public data.

Data: NAIC complaint index (2024) · CMS Transparency in Coverage (PY2025) · NAIC Auto Insurance Database (2023)

Published by PlainInsurer, an independent insurance-data publisher. Not affiliated with the NAIC, CMS, or any insurer. See our editorial & corrections policy.

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