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)

Medications indicated for this condition

FDA labeling

Drugs whose FDA labeling lists this condition's category among its indications. Informational only — not a treatment recommendation or medical advice.

Conditions mapped to this code

MedlinePlus · NIH

Plain-language health-topic references grounded in MedlinePlus (NIH/NLM).

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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