M86.421 (Chronic osteomyelitis with draining sinus, right humerus) compared with M86.429 (Chronic osteomyelitis with draining sinus, unspecified humerus), from the official CMS tabular data. M86.421 and M86.429 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. M86.421 and M86.429 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.
| M86.421Chronic osteomyelitis with draining sinus, right humerus | M86.429Chronic osteomyelitis with draining sinus, 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 | Chronic osteomyelitis with draining sinus, right humerus is a billable ICD-10-CM diagnosis code (M86.421). | Chronic osteomyelitis with draining sinus, unspecified humerus is a billable ICD-10-CM diagnosis code (M86.429). |
| 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