M87.377 (Other secondary osteonecrosis, right toe(s)) compared with M87.379 (Other secondary osteonecrosis, unspecified toe(s)), from the official CMS tabular data. M87.377 and M87.379 code the same condition on opposite sides. MedCoder-derived
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. M87.377 and M87.379 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.
| M87.377Other secondary osteonecrosis, right toe(s) | M87.379Other secondary osteonecrosis, unspecified toe(s) | |
|---|---|---|
| Billing status | Billable | Billable |
| Classification | M00-M99 — Diseases of the musculoskeletal system and connective tissue | M00-M99 — Diseases of the musculoskeletal system and connective tissue |
| Definition | Other secondary osteonecrosis, right toe(s) is a billable ICD-10-CM diagnosis code (M87.377). | Other secondary osteonecrosis, unspecified toe(s) is a billable ICD-10-CM diagnosis code (M87.379). |
| Includes | avascular necrosis of bone | avascular necrosis of bone |
| Use additional code | code to identify major osseous defect, if applicable (M89.7-) | code to identify major osseous defect, if applicable (M89.7-) |
Derived from the official CMS ICD-10-CM tabular data (FY2026). Not billing advice; verify sequencing rules for the encounter. All data sources