10ICD Code Hub

M90.5

Header — not billable

Osteonecrosis in diseases classified elsewhere

The ICD-10 code for osteonecrosis in diseases classified elsewhere is M90.5.

M90.5 is a non-billable header code. It groups related conditions but cannot be used on its own for reimbursement — select one of the 10 more specific codes below.

Clinical notes

Code first

This code represents a manifestation of an underlying disease. Coding convention requires the underlying (etiology) code to be sequenced first, with this code listed second.

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

Documentation support

General coding-documentation guidance — not a substitute for payer-specific requirements or professional coding judgment.

Child codes under M90.5

Related codes in this category