M77.51 (Other enthesopathy of right foot and ankle) compared with M77.52 (Other enthesopathy of left foot and ankle), from the official CMS tabular data. M77.51 and M77.52 code the same condition on opposite sides.
Same condition; these differ only in which side is documented.
These codes share a category and title and differ only in the side affected. The documentation decides which applies, and a bilateral code is reported only where the code set provides one.
Source: ICD-10-CM tabular list (laterality variant derived from the code title)
Same condition, opposite side. M77.51 and M77.52 name the same condition on opposite sides of the body.
Same category and title, differing only in which side is affected — the documentation decides which one applies, and a bilateral code is reported only where the code set provides one.
| M77.51Other enthesopathy of right foot and ankle | M77.52Other enthesopathy of left foot and ankle | |
|---|---|---|
| Billing status | Billable | Billable |
| Classification | M00-M99 — Diseases of the Musculoskeletal System and Connective Tissue (M00-M99) | M00-M99 — Diseases of the Musculoskeletal System and Connective Tissue (M00-M99) |
| Definition | Other enthesopathy of right foot and ankle is a billable ICD-10-CM diagnosis code (M77.51). | Other enthesopathy of left foot and ankle is a billable ICD-10-CM diagnosis code (M77.52). |
Derived from the official CMS ICD-10-CM tabular data (FY2026). Not billing advice; verify sequencing rules for the encounter. All data sources