M18.5
M18.5 — Other unilateral secondary osteoarthritis of first carpometacarpal joint
Non-billable headerICD-10-CM
M18.5 is a non-billable header ICD-10-CM code for other unilateral secondary osteoarthritis of first carpometacarpal joint. It cannot be billed on its own: choose one of the more specific child codes below.
Inclusion terms
Alternative wordings a physician may use in the chart for this same code.
- Secondary osteoarthritis of first carpometacarpal joint NOS
Risk adjustment
M18.5 does not map to an HCC and does not risk-adjust under CMS-HCC V28. That is normal — most ICD-10 codes do not. It still needs to be coded correctly; it just will not move a RAF score.
Code to one of these instead M18.5
3 child codes. Green means billable.
Related codes at this level
Codes that share M18. If M18.5 is not quite right, the correct code is usually one of these.
- M18.0Bilateral primary osteoarthritis of first carpometacarpal joints
- M18.1Unilateral primary osteoarthritis of first carpometacarpal joint
- M18.2Bilateral post-traumatic osteoarthritis of first carpometacarpal joints
- M18.3Unilateral post-traumatic osteoarthritis of first carpometacarpal joint
- M18.4Other bilateral secondary osteoarthritis of first carpometacarpal joints
- M18.9Osteoarthritis of first carpometacarpal joint, unspecified
Questions about M18.5
- Is M18.5 a billable ICD-10-CM code?
- No. M18.5 is a non-billable header code. Code to a higher level of specificity using one of its child codes.
- Where does M18.5 sit in the tabular list?
- Diseases of the musculoskeletal system and connective tissue (M00-M99), in the block Osteoarthritis (M15-M19).