M86.171 (Other acute osteomyelitis, right ankle and foot) compared with M86.172 (Other acute osteomyelitis, left ankle and foot), from the official CMS tabular data. M86.171 and M86.172 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. M86.171 and M86.172 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.
| M86.171Other acute osteomyelitis, right ankle and foot | M86.172Other acute osteomyelitis, left ankle and foot | |
|---|---|---|
| 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 ankle and foot is a billable ICD-10-CM diagnosis code (M86.171). | Other acute osteomyelitis, left ankle and foot is a billable ICD-10-CM diagnosis code (M86.172). |
| 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