M86.351 (Chronic multifocal osteomyelitis, right femur) compared with M86.359 (Chronic multifocal osteomyelitis, unspecified femur), from the official CMS tabular data. M86.351 and M86.359 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. M86.351 and M86.359 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.
| M86.351Chronic multifocal osteomyelitis, right femur | M86.359Chronic multifocal osteomyelitis, unspecified femur | |
|---|---|---|
| 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 | Chronic multifocal osteomyelitis, right femur is a billable ICD-10-CM diagnosis code (M86.351). | Chronic multifocal osteomyelitis, unspecified femur is a billable ICD-10-CM diagnosis code (M86.359). |
| 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