M18.10 Unilateral primary osteoarthritis of first carpometacarpal joint, unspecified hand

Billable ICD-10-CM code, FY2026.

Applies from M18.1 Unilateral primary osteoarthritis of first carpometacarpal joint

Applicable to

• Primary osteoarthritis of first carpometacarpal joint NOS

MS-DRG index

Defines the logic of DRG(s) 553-554 in MDC 08.

Approximate ICD-9-CM (GEMs)

• 715.14 Osteoarthrosis, localized, primary, hand (approximate)

Code annotations containing back-references to M18.10

Back-references to M18.1

• Type 2 Excludes: M19.04 Primary osteoarthritis, hand ("primary osteoarthritis of first carpometacarpal joint (M18.0-, M18.1-)")

Back-references to M18

• Type 1 Excludes: M12 Other and unspecified arthropathy ("arthrosis (M15-M19)")
• Type 1 Excludes: M13 Other arthritis ("arthrosis (M15-M19)")
• Type 1 Excludes: M13 Other arthritis ("osteoarthritis (M15-M19)")
• Type 1 Excludes: M13.8 Other specified arthritis ("osteoarthritis (M15-M19)")
• Type 1 Excludes: M15 Polyosteoarthritis ("bilateral involvement of single joint (M16-M19)")

Nearby codes

• M18 Osteoarthritis of first carpometacarpal joint
• M18.0 Bilateral primary osteoarthritis of first carpometacarpal joints
• M18.1 Unilateral primary osteoarthritis of first carpometacarpal joint
• M18.10 Unilateral primary osteoarthritis of first carpometacarpal joint, unspecified hand (this code)
• M18.11 Unilateral primary osteoarthritis of first carpometacarpal joint, right hand
• M18.12 Unilateral primary osteoarthritis of first carpometacarpal joint, left hand
• M18.2 Bilateral post-traumatic osteoarthritis of first carpometacarpal joints
• M18.3 Unilateral post-traumatic osteoarthritis of first carpometacarpal joint
• M18.30 Unilateral post-traumatic osteoarthritis of first carpometacarpal joint, unspecified hand