M18.1 Unilateral primary osteoarthritis of first carpometacarpal joint

Non-billable header with 3 child codes.

Applicable to

• Primary osteoarthritis of first carpometacarpal joint NOS

Codes under M18.1

• M18.10 Unilateral primary osteoarthritis of first carpometacarpal joint, unspecified hand
• M18.11 Unilateral primary osteoarthritis of first carpometacarpal joint, right hand
• M18.12 Unilateral primary osteoarthritis of first carpometacarpal joint, left hand

Code annotations containing back-references to M18.1

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)")

Diagnosis Index entries for M18.1

• Osteoarthritis › primary › hand joint › first carpometacarpal joint

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 (this code)
• M18.10 Unilateral primary osteoarthritis of first carpometacarpal joint, unspecified hand
• 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