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M05.4

M05.4: Rheumatoid myopathy with rheumatoid arthritis

Non-billable headerICD-10-CM

M05.4 is a non-billable header ICD-10-CM code for rheumatoid myopathy with rheumatoid arthritis. It cannot be billed on its own: choose one of the more specific child codes below.

Excludes1 inherited from the categories above M05.4

A category’s note binds every code beneath it.

Written on M05: Rheumatoid arthritis with rheumatoid factor

  • rheumatic fever (I00)
  • juvenile rheumatoid arthritis (M08.-)
  • rheumatoid arthritis of spine (M45.-)

Other codes that can never be billed with M05.4

Their own Excludes1 notes name this code, so the conflict is not listed above.

  • R76.81Abnormal rheumatoid factor and anti-citrullinated protein antibody without rheumatoid arthritis

Risk adjustment

No CMS-HCC V28 category: this code does not change a RAF score.

Code history

Unchanged in every release from FY2024 to FY2027.

Code to one of these instead M05.4

9 child codes. Green means billable.

Other codes under M05

ICD-10-CMFY2027· effective October 1, 2026

Loaded directly from the CMS/NCHS ICD-10-CM public-domain release: see data sources and our editorial policy. If this page disagrees with the CMS tabular list, this page is wrong. Reference information for professional coders; not medical or billing advice.