M05.A

Billable

Abnormal rheumatoid factor and anti-citrullinated protein antibody with rheumatoid arthritis

M05.A is the ICD-10-CM code for Abnormal rheumatoid factor and anti-citrullinated protein antibody with rheumatoid arthritis. It is a billable, specific code valid for reimbursement.

Status
Billable
Chapter
M00-M99
Parent
M05
Edition
FY2026

M00-M99 Diseases of the musculoskeletal system and connective tissue

Code first

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

Frequently asked questions

What is ICD-10 code M05.A?
M05.A is the ICD-10-CM code for "Abnormal rheumatoid factor and anti-citrullinated protein antibody with rheumatoid arthritis". It falls under M00-M99 Diseases of the musculoskeletal system and connective tissue.
Is M05.A a billable code?
Yes — M05.A is a billable, specific ICD-10-CM code valid for reimbursement.

Source: CMS ICD-10-CM FY2026. For informational purposes only — not medical advice. See our medical disclaimer.

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