M87
Osteonecrosis
M87 is a non-billable ICD-10-CM code category for osteonecrosis. Report a more specific code from it instead. It is part of the FY2027 code set, effective October 1, 2026. The more specific codes under it are M87.0 Idiopathic aseptic necrosis of bone, M87.1 Osteonecrosis due to drugs, M87.2 Osteonecrosis due to previous trauma, M87.3 Other secondary osteonecrosis and 2 more. Its coding notes include a Use additional code instruction, 3 Excludes1 entries and 10 Excludes2 entries.
Guidelines tip
From the FY2027 Official Guidelines. ICD10Ref adds no rules of its own.
When the lower or upper end of a bone is affected near a joint, the site is the bone, not the joint.
Use additional code
Add the listed code as a secondary code, if known.
- code to identify major osseous defect, if applicable (M89.7-)
Excludes1
Not coded here. The listed conditions generally should not be reported together.
- juvenile osteonecrosis (M91-M92)
- osteochondropathies (M90-M93)
Excludes2
Not included here. Both codes may be reported if the patient has both conditions.
Also from chapter/block level (10 notes)
- arthropathic psoriasis (L40.5-)
- certain conditions originating in the perinatal period (P04-P96)
- certain infectious and parasitic diseases (A00-B99)
- compartment syndrome (traumatic) (T79.A-)
- complications of pregnancy, childbirth and the puerperium (O00-O9A)
- congenital malformations, deformations, and chromosomal abnormalities (Q00-Q99)
- endocrine, nutritional and metabolic diseases (E00-E88)
- injury, poisoning and certain other consequences of external causes (S00-T88)
- neoplasms (C00-D49)
- symptoms, signs and abnormal clinical and laboratory findings, not elsewhere classified (R00-R94)
Includes
Further defines or gives examples of the content of the category.
- avascular necrosis of bone
Notes
Also from chapter/block level (1 note)
- Use an external cause code following the code for the musculoskeletal condition, if applicable, to identify the cause of the musculoskeletal condition