2026
ICD-10-CM
Diagnosis
Code

M05.A Abnormal rheumatoid factor and anti-citrullinated protein antibody with rheumatoid arthritis

  • Billable
  • 2026–2026

M05.A is a new billable/specific diagnosis code introduced in the 2026 ICD-10-CM used to classify the following condition: Abnormal rheumatoid factor and anti-citrullinated protein antibody with rheumatoid arthritis.

Code first

  • Rheumatoid arthritis with rheumatoid factor by site, if known (M05.00 to M05.8A)

Versions

  1. 2026

    New code