Alphabetic Index FY2027

M90.5

Osteonecrosis in diseases classified elsewhere

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.

M90.5 is a non-billable ICD-10-CM code header for osteonecrosis in diseases classified elsewhere. 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 M90.50 Osteonecrosis in diseases classified elsewhere, unspecified site; M90.51 Osteonecrosis in diseases classified elsewhere, shoulder; M90.52 Osteonecrosis in diseases classified elsewhere, upper arm; M90.53 Osteonecrosis in diseases classified elsewhere, forearm and 6 more. Its coding notes include a Code first instruction, 10 Excludes1 entries and 10 Excludes2 entries.

Code first

If the underlying condition listed here is present and known, sequence it first.

This code
  • underlying disease, such as:
    • caisson disease (T70.3)
    • hemoglobinopathy (D50-D64)

Excludes1

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

Inherited from M90 Osteopathies in diseases classified elsewhere
  • osteochondritis, osteomyelitis, and osteopathy (in):
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)

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 M90.5 10