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M05.9 — Rheumatoid arthritis with rheumatoid factor, unspecified
M05.9
What this code means
Rheumatoid arthritis in which the rheumatoid factor blood test is positive; the sites involved are not specified.
Also called: seropositive rheumatoid arthritis, rheumatoid arthritis with rheumatoid factor.
When this code is used
Used for rheumatoid arthritis with rheumatoid factor, unspecified.
Where it sits in ICD-10-CM
Code M05.9 belongs to Chapter 13: Diseases of the musculoskeletal system and connective tissue, which covers codes M00–M99 in the FY2027 ICD-10-CM tabular list. The official description above is copied verbatim from the CDC/NCHS FY2027 code file.
Related symptoms
Frequently asked questions
What is ICD-10-CM code M05.9?
M05.9 is the ICD-10-CM diagnosis code for “Rheumatoid arthritis with rheumatoid factor, unspecified”. Rheumatoid arthritis in which the rheumatoid factor blood test is positive; the sites involved are not specified.
When is code M05.9 used?
Used for rheumatoid arthritis with rheumatoid factor, unspecified. It belongs to Chapter 13 of ICD-10-CM (Diseases of the musculoskeletal system and connective tissue).
This guide explains ICD-10-CM codes in plain language for patients, students and other readers. It is educational information only — not coding, billing or medical advice. The code recorded for any real encounter is assigned from the full clinical documentation by the treating team and qualified coders, and only they can decide which code fits a specific case.