M87 vs M91
M87 (Osteonecrosis) compared with M91 (Juvenile osteochondrosis of hip and pelvis), from the official CMS tabular data. Do not report these codes together: the official tabular list marks them Excludes1.
Can these codes be reported together?
No — do not report together. M87 carries an Excludes1 note covering M91: “juvenile osteonecrosis (M91-M92)”
Sole exception: when the two conditions are documented as unrelated to each other (ICD-10-CM Official Guidelines, Section I.A.12.a).
Side by side
| M87Osteonecrosis | M91Juvenile osteochondrosis of hip and pelvis | |
|---|---|---|
| Billing status | Non-billable header | Non-billable header |
| 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 is a non-billable ICD-10-CM category code (M87). | Juvenile osteochondrosis of hip and pelvis is a non-billable ICD-10-CM category code (M91). |
| Includes | avascular necrosis of bone | — |
| Use additional code | 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