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Learn how to correctly report CPT 52442 with base code 52441, meet documentation requirements, avoid common denials, and keep multi-implant claims clean.

California internal medicine billing carries a layer of complexity most states don't: 24 distinct Medi-Cal managed care plans, IPA capitation arrangements running alongside fee-for-service claims, and a 2026 CalAIM restructuring of payment logic. This guide compares 10 billing companies serving California internal medicine practices, the criteria worth evaluating any of them against, and what's genuinely changed for 2026.