CMS Releases 400+ New Diagnosis Codes for FY 2026, Effective October 1

The Centers for Medicare & Medicaid Services and CDC have announced over 400 new ICD-10-CM diagnostic codes taking effect October 1, 2025, including codes for diabetes remission, multiple sclerosis progression, and various other conditions. These coding changes will affect claims processing, documentation requirements, and reimbursement methodologies for Medicaid managed care plans that rely on encounter data and risk adjustment. MCOs will need to update systems, train providers, and adjust coding workflows ahead of the October implementation date.

Managed Care · Finance

This is outside commentary from Avalere, not part of Medicaid Monitor's independently scored news coverage.

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