M90.539
Osteonecrosis in diseases classified elsewhere, unspecified forearm
Billable FY2026 2025-10-01 → 2026-09-30
This is the unspecified option. 2 more
specific codes sit alongside it. Worth
checking whether the documentation supports one of them.
Exclusions 19 never code together
M90code
Excludes1
- osteochondritis, osteomyelitis, and osteopathy (in):
- cryptococcosis (B45.3)B45.3
- diabetes mellitus (E08-E13 with .69-)E08-E13
- gonococcal (A54.43)A54.43
- neurogenic syphilis (A52.11)A52.11
- renal osteodystrophy (N25.0)N25.0
- salmonellosis (A02.24)A02.24
- secondary syphilis (A51.46)A51.46
- syphilis (late) (A52.77)A52.77
M00-M99chapter
Excludes2
- arthropathic psoriasis (L40.5-)L40.5-
- certain conditions originating in the perinatal period (P04-P96)P04-P96
- certain infectious and parasitic diseases (A00-B99)A00-B99
- compartment syndrome (traumatic) (T79.A-)T79.A-
- complications of pregnancy, childbirth and the puerperium (O00-O9A)O00-O9A
- congenital malformations, deformations, and chromosomal abnormalities (Q00-Q99)Q00-Q99
- endocrine, nutritional and metabolic diseases (E00-E88)E00-E88
- injury, poisoning and certain other consequences of external causes (S00-T88)S00-T88
- neoplasms (C00-D49)C00-D49
- symptoms, signs and abnormal clinical and laboratory findings, not elsewhere classified (R00-R94)R00-R94
Excludes1 — never code together. The excluded condition and this one are mutually exclusive.
Excludes2 — not included here, but the patient may have both. Code both when documented.
Instructional notes 4
Index entries leading here filed at null
No alphabetic index entry points at this code.
Alongside this code 2 same parent — M90.53
Additional references
AHA Coding Clinic® Licence required
Official coding advice for this code. Published by the American Hospital Association. Not included in this installation.