M18
Non-billableOsteoarthritis of first carpometacarpal joint
M18 is the ICD-10-CM code for Osteoarthritis of first carpometacarpal joint. It is a non-billable category code — use a more specific child code such as M18.0 for billing.
- Status
- Header (non-billable)
- Chapter
- M00-M99
- Subcodes
- 7
- Edition
- FY2026
M00-M99 Diseases of the musculoskeletal system and connective tissue
What this means — in plain language
MedlinePlus · NIHWhat is osteoarthritis? Osteoarthritis, sometimes called OA, is a type of arthritis that only affects the joints, usually in the hands, knees, hips, neck, and lower back. It's the most common type of arthritis. In a healthy joint, the ends of the bones are covered with a smooth, slippery tissue called cartilage. The cartilage pads the bones and helps them glide easily when you move the joint. With osteoarthritis,…
Read more about Osteoarthritis at MedlinePlus ↗Source: U.S. National Library of Medicine (MedlinePlus). Informational only — not medical advice.
Frequently asked questions
Source: CMS ICD-10-CM FY2026. For informational purposes only — not medical advice. See our medical disclaimer.
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