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Compare/M87 vs M93

M87 vs M93

M87 (Osteonecrosis) compared with M93 (Other osteochondropathies), 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 M93: “osteochondropathies (M90-M93)”

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

M87OsteonecrosisM93Other osteochondropathies
Billing statusNon-billable header

Report instead: M87.00, M87.011, M87.012, M87.019, M87.021

Non-billable header

Report instead: M93.001, M93.002, M93.003, M93.004, M93.011

ClassificationM00-M99 — Diseases of the Musculoskeletal System and Connective Tissue (M00-M99)M00-M99 — Diseases of the Musculoskeletal System and Connective Tissue (M00-M99)
DefinitionOsteonecrosis is a non-billable ICD-10-CM category code (M87).Other osteochondropathies is a non-billable ICD-10-CM category code (M93).
Includes
avascular necrosis of bone
—
Use additional code
code to identify major osseous defect, if applicable (M89.7-)
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Derived from the official CMS ICD-10-CM tabular data (FY2026). Not billing advice; verify sequencing rules for the encounter. All data sources