M87.121 (Osteonecrosis due to drugs, right humerus) compared with M87.129 (Osteonecrosis due to drugs, unspecified humerus), from the official CMS tabular data. M87.121 and M87.129 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. M87.121 and M87.129 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.
| M87.121Osteonecrosis due to drugs, right humerus | M87.129Osteonecrosis due to drugs, unspecified humerus | |
|---|---|---|
| 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 | Osteonecrosis due to drugs, right humerus is a billable ICD-10-CM diagnosis code (M87.121). | Osteonecrosis due to drugs, unspecified humerus is a billable ICD-10-CM diagnosis code (M87.129). |
| Includes | avascular necrosis of bone | avascular necrosis of bone |
| Use additional code | code for adverse effect, if applicable, to identify drug (T36-T50 with fifth or sixth character 5) code to identify major osseous defect, if applicable (M89.7-) | code for adverse effect, if applicable, to identify drug (T36-T50 with fifth or sixth character 5) 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