Skip to content
HCC Buddy home

M18.10

Billable

Unilateral primary osteoarthritis of first carpometacarpal joint, unspecified hand

This code does not map to an HCC category in any model (V28, V24, ESRD, RxHCC).

What This Code Means

Primary osteoarthritis of the thumb base joint on one hand, but the specific hand (right or left) is not documented.

Coding Tips

  • •Request clarification on which hand is affected to assign the more specific M18.11 or M18.12 code
  • •This unspecified code should be avoided when laterality information is available in the record

Code Hierarchy

└M18Osteoarthritis of first carpometacarpal joint└M18.1Unilateral primary osteoarthritis of first carpometacarpal joint└M18.10Unilateral primary osteoarthritis of first carpometacarpal joint, unspecified hand
└M18.10Unilateral primary osteoarthritis of first carpometacarpal joint, unspecified hand

Open M18.10 in the Interactive Encoder

See full code details, AI coding tips, HCC mappings, and related codes in our interactive encoder. Start your 14-day Pro trial — no credit card required.

Open in EncoderStart 14-Day Pro Trial