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C-Codes

Outpatient Prospective Payment System

622 codes, grouped by CMS code range, with removed codes labelled.

C1000–C1999134 codes
C2000–C299934 codes
C5000–C59998 codes
C7000–C799973 codes
C8000–C899951 codes
C9000–C9999322 codes

Disclaimer: This utility is for reference and administrative decision support only. It is not a substitute for direct professional medical advice, clinical diagnosis, or legal coding audits. Always verify complex claims against the official national codebooks.

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ICD-10-CM is published by CMS and the CDC; HCPCS Level II, ICD-10-PCS and MS-DRG by CMS. All are works of the US federal government. CPT is a registered trademark of the American Medical Association and is not reproduced on this site; WHO ICD-10 is not reproduced either. MedCoder.ai is an independent reference and is not affiliated with, endorsed by, or sponsored by CMS, the CDC, the AMA, the WHO, the National Library of Medicine, or AHRQ. All data sources · how we verify · scope and limitations · third-party software notices.

Current data releases:ICD-10-CM FY2027 · ICD-10-PCS FY2027 · HCPCS October 2026 · MS-DRG v44 · Medicare Code Editor v44.0 · NCCI PTP Q4 2026 · MUE Q4 2026 · NCD code lists 2026-01 · LCD export September 28, 2026 · All releases and sources

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