Alphabetic Index FY2027

M87.8

Other osteonecrosis

FY2027Chapter 13: Diseases of the musculoskeletal system and connective tissue/M86–M90 Other osteopathies

Non-billable headerNot valid on its own. Use one of the more specific codes under it.

M87.8 is a non-billable ICD-10-CM code header for other 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 M87.80 Other osteonecrosis, unspecified bone; M87.81 Other osteonecrosis, shoulder; M87.82 Other osteonecrosis, humerus; M87.83 Other osteonecrosis of radius, ulna and carpus and 6 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.

Guidelines I.C.13.a.1Site of bone conditions: bone, not jointRead the official text

Use additional code

Add the listed code as a secondary code, if known.

Inherited from M87 Osteonecrosis
  • code to identify major osseous defect, if applicable (M89.7-)

Excludes1

Not coded here. The listed conditions generally should not be reported together.

Inherited from M87 Osteonecrosis
  • juvenile osteonecrosis (M91-M92)
  • osteochondropathies (M90-M93)
Also from chapter/block level (1 note)
Inherited from M86–M90 Other osteopathies
  • postprocedural osteopathies (M96.-)

Excludes2

Not included here. Both codes may be reported if the patient has both conditions.

Also from chapter/block level (10 notes)
Inherited from Chapter 13 Diseases of the musculoskeletal system and connective tissue
  • 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.

Inherited from M87 Osteonecrosis
  • avascular necrosis of bone

Notes

Also from chapter/block level (1 note)
Inherited from Chapter 13 Diseases of the musculoskeletal system and connective tissue
  • Use an external cause code following the code for the musculoskeletal condition, if applicable, to identify the cause of the musculoskeletal condition

More specific codes under M87.8 10