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  3. Ch. M00-M99
  4. Sec. M15-M19
  5. Category M18
Category M18

Osteoarthritis of first carpometacarpal joint

Clinical Classification Guidelines

Specific Diagnosis Codes

Bilateral primary osteoarthritis of first carpometacarpal joints
M18.0
Unilateral primary osteoarthritis of first carpometacarpal joint
M18.1
Unilateral primary osteoarthritis of first carpometacarpal joint, unspecified hand
M18.10
Unilateral primary osteoarthritis of first carpometacarpal joint, right hand
M18.11
Unilateral primary osteoarthritis of first carpometacarpal joint, left hand
M18.12
Bilateral post-traumatic osteoarthritis of first carpometacarpal joints
M18.2
Unilateral post-traumatic osteoarthritis of first carpometacarpal joint
M18.3
Unilateral post-traumatic osteoarthritis of first carpometacarpal joint, unspecified hand
M18.30
Unilateral post-traumatic osteoarthritis of first carpometacarpal joint, right hand
M18.31
Unilateral post-traumatic osteoarthritis of first carpometacarpal joint, left hand
M18.32
Other bilateral secondary osteoarthritis of first carpometacarpal joints
M18.4
Other unilateral secondary osteoarthritis of first carpometacarpal joint
M18.5
Other unilateral secondary osteoarthritis of first carpometacarpal joint, unspecified hand
M18.50
Other unilateral secondary osteoarthritis of first carpometacarpal joint, right hand
M18.51
Other unilateral secondary osteoarthritis of first carpometacarpal joint, left hand
M18.52
Osteoarthritis of first carpometacarpal joint, unspecified
M18.9
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Data updated for October 2025 release.

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