Coding and coverage · ICD-10-CM

M90

M90.5 Osteonecrosis in diseases classified elsewhere

Not billable (header)Chapter 13

Report one of the more specific codes below.

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Codes under this one

  • M90.50 Osteonecrosis in diseases classified elsewhere, unspecified site
  • M90.51 Osteonecrosis in diseases classified elsewhere, shoulderHeader
  • M90.52 Osteonecrosis in diseases classified elsewhere, upper armHeader
  • M90.53 Osteonecrosis in diseases classified elsewhere, forearmHeader
  • M90.54 Osteonecrosis in diseases classified elsewhere, handHeader
  • M90.55 Osteonecrosis in diseases classified elsewhere, thighHeader
  • M90.56 Osteonecrosis in diseases classified elsewhere, lower legHeader
  • M90.57 Osteonecrosis in diseases classified elsewhere, ankle and footHeader
  • M90.58 Osteonecrosis in diseases classified elsewhere, other site
  • M90.59 Osteonecrosis in diseases classified elsewhere, multiple sites

Instructional notes

Chapter 13

Excludes2Not included here: the patient may have both; report both when both are present.
  • 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)
Notes
  • Use an external cause code following the code for the musculoskeletal condition, if applicable, to identify the cause of the musculoskeletal condition

M90

Excludes1Not coded here: never report with this code, except when the two conditions are unrelated.
  • osteochondritis, osteomyelitis, and osteopathy (in):
  • cryptococcosis (B45.3)
  • diabetes mellitus (E08-E13 with .69-)
  • gonococcal (A54.43)
  • neurogenic syphilis (A52.11)
  • renal osteodystrophy (N25.0)
  • salmonellosis (A02.24)
  • secondary syphilis (A51.46)
  • syphilis (late) (A52.77)

This code

Code firstSequence the underlying condition first.
  • underlying disease, such as:
  • caisson disease (T70.3)
  • hemoglobinopathy (D50-D64)

Chapter 13: Diseases of the musculoskeletal system and connective tissue · M80-M94 Osteopathies and chondropathies (M80-M94)

Source: ICD-10-CM FY 2027 code descriptions and tabular list (CMS and CDC National Center for Health Statistics), effective 2026-10-01 through 2027-09-30 · CMS ICD-10 files. HCC mapping: CMS-HCC V28, payment year 2027. As of 2026-11-04.

Coverage and payment depend on the claim details; confirm with the Medicare Administrative Contractor.