ICD-10-CM 2027
ICD-10 code for bone necrosis
From the official ICD-10-CM alphabetic index entry “Necrosis, necrotic (ischemic) › bone”. Page updated September 29, 2026.
About coding bone necrosis
The ICD-10-CM code for bone necrosis is M87.9 (Osteonecrosis, unspecified). The official index lists 3 more specific codes, so check the documentation for details such as type, cause, site or severity before settling on M87.9.
Within M87, choose M87.9 (unspecified) only when documentation doesn't support a more specific option: idiopathic aseptic necrosis of bone (M87.0), due to drugs (M87.1), due to previous trauma (M87.2), other secondary osteonecrosis (M87.3) and other osteonecrosis (M87.8).
Use an additional code to identify major osseous defect, if applicable (M89.7-).
As a secondary diagnosis it is a CC (complication or comorbidity), which can move an inpatient stay into the "with CC" MS-DRG of its family, unless the principal diagnosis excludes it.
More specific bone necrosis codes (official index)
Common questions about bone necrosis ICD-10 codes
What is the ICD-10 code for bone necrosis?
- M87.9 — Osteonecrosis, unspecified. More specific codes apply when the documentation supports them: M87.00, J32.2, M27.2.
What is the ICD-10 code for ethmoid bone necrosis?
- J32.2 — Chronic ethmoidal sinusitis.
What is the ICD-10 code for jaw bone necrosis?
- M27.2 — Inflammatory conditions of jaws.
Is M87.9 billable?
- Yes. M87.9 is a billable/specific ICD-10-CM code valid for FY2027 (October 1, 2026 – September 30, 2027).
Can M87.9 be used as a principal diagnosis?
- Yes. The Medicare Code Editor doesn't restrict M87.9 as a principal diagnosis.
Is M87.9 a CC or MCC?
- M87.9 is a CC (complication or comorbidity) under MS-DRG v44.0, unless excluded by the principal diagnosis.