M86.121 (Other acute osteomyelitis, right humerus) compared with M86.129 (Other acute osteomyelitis, unspecified humerus), from the official CMS tabular data. M86.121 and M86.129 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. M86.121 and M86.129 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.
| M86.121Other acute osteomyelitis, right humerus | M86.129Other acute osteomyelitis, 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 | Other acute osteomyelitis, right humerus is a billable ICD-10-CM diagnosis code (M86.121). | Other acute osteomyelitis, unspecified humerus is a billable ICD-10-CM diagnosis code (M86.129). |
| Use additional code | code (B95-B97) to identify infectious agent code to identify major osseous defect, if applicable (M89.7-) | code (B95-B97) to identify infectious agent 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