ICD-10-CM 2027
ICD-10 code for idiopathic aseptic osteonecrosis
Idiopathic aseptic necrosis of unspecified bone
From the official ICD-10-CM alphabetic index entry “Osteonecrosis › idiopathic aseptic”. Page updated September 29, 2026.
About coding idiopathic aseptic osteonecrosis
The ICD-10-CM code for idiopathic aseptic osteonecrosis is M87.00 (Idiopathic aseptic necrosis of unspecified bone). The official index lists 24 more specific codes, so check the documentation for details such as type, cause, site or severity before settling on M87.00.
Within M87.0, choose M87.00 (unspecified bone) only when documentation doesn't support a more specific option: shoulder (M87.01), humerus (M87.02), radius, ulna and carpus (M87.03), hand and fingers (M87.04), pelvis and femur (M87.05), tibia and fibula (M87.06), ankle, foot and toes (M87.07), other site (M87.08) and 1 more.
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 idiopathic aseptic osteonecrosis codes (official index)
- ankle M87.07 — Idiopathic aseptic necrosis of ankle, foot and toes
- carpus M87.03 — Idiopathic aseptic necrosis of radius, ulna and carpus
- clavicle M87.01 — Idiopathic aseptic necrosis of shoulder
- femur M87.05 — Idiopathic aseptic necrosis of pelvis and femur
- fibula M87.06 — Idiopathic aseptic necrosis of tibia and fibula
- finger M87.04 — Idiopathic aseptic necrosis of hand and fingers
- humerus M87.02 — Idiopathic aseptic necrosis of humerus
- ilium M87.050 — Idiopathic aseptic necrosis of pelvis
- ischium M87.050 — Idiopathic aseptic necrosis of pelvis
- metacarpus M87.04 — Idiopathic aseptic necrosis of hand and fingers
- metatarsus M87.07 — Idiopathic aseptic necrosis of ankle, foot and toes
- multiple sites M87.09 — Idiopathic aseptic necrosis of bone, multiple sites
- neck M87.08 — Idiopathic aseptic necrosis of bone, other site
- pelvis M87.050 — Idiopathic aseptic necrosis of pelvis
- pubic ramus [pubis] M87.050 — Idiopathic aseptic necrosis of pelvis
- radius M87.03 — Idiopathic aseptic necrosis of radius, ulna and carpus
- rib M87.08 — Idiopathic aseptic necrosis of bone, other site
- scapula M87.01 — Idiopathic aseptic necrosis of shoulder
- skull M87.08 — Idiopathic aseptic necrosis of bone, other site
- tarsus M87.07 — Idiopathic aseptic necrosis of ankle, foot and toes
- tibia M87.06 — Idiopathic aseptic necrosis of tibia and fibula
- toe M87.07 — Idiopathic aseptic necrosis of ankle, foot and toes
- ulna M87.03 — Idiopathic aseptic necrosis of radius, ulna and carpus
- vertebra M87.08 — Idiopathic aseptic necrosis of bone, other site
Common questions about idiopathic aseptic osteonecrosis ICD-10 codes
What is the ICD-10 code for idiopathic aseptic osteonecrosis?
- M87.00 — Idiopathic aseptic necrosis of unspecified bone. More specific codes apply when the documentation supports them: M87.07, M87.03, M87.01, M87.05 and others below.
What is the ICD-10 code for ankle idiopathic aseptic osteonecrosis?
- M87.07 — Idiopathic aseptic necrosis of ankle, foot and toes (header code; choose a more specific subcode).
What is the ICD-10 code for carpus idiopathic aseptic osteonecrosis?
- M87.03 — Idiopathic aseptic necrosis of radius, ulna and carpus (header code; choose a more specific subcode).
What is the ICD-10 code for clavicle idiopathic aseptic osteonecrosis?
- M87.01 — Idiopathic aseptic necrosis of shoulder (header code; choose a more specific subcode).
What is the ICD-10 code for femur idiopathic aseptic osteonecrosis?
- M87.05 — Idiopathic aseptic necrosis of pelvis and femur (header code; choose a more specific subcode).
What is the ICD-10 code for fibula idiopathic aseptic osteonecrosis?
- M87.06 — Idiopathic aseptic necrosis of tibia and fibula (header code; choose a more specific subcode).
What is the ICD-10 code for finger idiopathic aseptic osteonecrosis?
- M87.04 — Idiopathic aseptic necrosis of hand and fingers (header code; choose a more specific subcode).
Is M87.00 billable?
- Yes. M87.00 is a billable/specific ICD-10-CM code valid for FY2027 (October 1, 2026 – September 30, 2027).
Can M87.00 be used as a principal diagnosis?
- Yes. The Medicare Code Editor doesn't restrict M87.00 as a principal diagnosis.
Is M87.00 a CC or MCC?
- M87.00 is a CC (complication or comorbidity) under MS-DRG v44.0, unless excluded by the principal diagnosis.