ICD-10 Coding for Tarsometatarsal Joint Osteophyte
Use ICD-10 code M25.77- (Osteophyte, ankle and foot) for a tarsometatarsal joint bone spur, with the appropriate laterality modifier (1 for right, 2 for left).
Specific Coding Guidance
The correct code is:
- M25.771 - Osteophyte, right ankle and foot
- M25.772 - Osteophyte, left ankle and foot
This code encompasses bone spurs/osteophytes in the ankle and foot region, which includes the tarsometatarsal (TMT) joints.
Clinical Context for Documentation
To support proper coding, your documentation should specify:
- Exact joint location: Which TMT joint(s) are affected (1st through 5th)
- Laterality: Right, left, or bilateral
- Associated conditions: Whether this is related to osteoarthritis, post-traumatic changes, or isolated osteophyte formation
The TMT joints are common sites for osteophyte formation, particularly in the setting of osteoarthritis or post-traumatic arthritis 1. The second TMT joint is notably the most stable and frequently affected by fracture-dislocations rather than pure ligamentous injuries 2, which may predispose to later osteophyte development.
Alternative Codes if Osteoarthritis is Present
If the osteophyte is part of documented osteoarthritis rather than an isolated finding, consider instead:
- M19.071/M19.072 - Primary osteoarthritis, ankle and foot (right/left)
This would be more appropriate if there is radiographic evidence of joint space narrowing, subchondral sclerosis, or other arthritic changes beyond just the osteophyte 3.
Common Documentation Pitfalls
- Don't use codes for ankle impingement (which typically refers to tibiotalar osteophytes 4) when the pathology is specifically at the TMT joints
- Avoid using unspecified joint codes when the specific TMT joint location can be documented
- If bilateral, code both sides separately rather than using an unspecified laterality code