M18
ICD-10Non-billable categoryOsteoarthritis of first carpometacarpal joint
Official ICD-10-CM descriptor (FY2026)
Osteoarthritis of first carpometacarpal joint
M18 is a category heading, not a billable code. CMS does not accept it on a claim; report one of the more specific codes beneath it.
More specific codes under M18
- M18.0Bilateral primary osteoarth of first carpometacarp joints
- M18.1Unilateral primary osteoarth of first carpometacarp jointcategory
- M18.2Bi post-trauma osteoarth of first carpometacarp joints
- M18.3Unil post-trauma osteoarth of first carpometacarp jointcategory
- M18.4Oth bi secondary osteoarth of first carpometacarp joints
- M18.5Oth unil secondary osteoarth of first carpometacarp jointcategory
- M18.9Osteoarthritis of first carpometacarpal joint, unspecified
Where this code sits
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ICD-10-CM FY2026. Centers for Medicare & Medicaid Services (CMS) / National Center for Health Statistics (NCHS), “2026 ICD-10-CM Code Descriptions in Tabular Order” (icd10cm_order_2026.txt). Download the original file from cms.gov. Public domain (US Government work). Descriptors, billable flags and instructional notes on this page are reproduced from that file without modification. Krasyn adds no clinical guidance.