ICD-10 Code M06.00 – Rheumatoid arthritis without rheumatoid factor, unspecified site (2026): Diagnosis, Symptoms & Billing Guide
2026 ICD-10-CM Diagnosis Code M06.00 – Rheumatoid arthritis without rheumatoid factor, unspecified site
What it is
This code identifies rheumatoid arthritis when the record states there is no rheumatoid factor and the affected site is not specified. Use it for a documented RA diagnosis without a named joint or body region.
Clinical signs
Typical findings include chronic inflammatory joint pain, swelling, stiffness, and reduced range of motion. Clinical features vary; refer to documentation, especially when serology is negative or not clearly reported.
When to use this code
Use this code when the provider documents rheumatoid arthritis without rheumatoid factor and does not name the involved site. It also fits notes that confirm RA but leave the joint location unspecified. If the site is documented later, code more specifically.
Do not use for
Do not use this code for rheumatoid arthritis with rheumatoid factor or for a clearly stated site-specific RA code. Check documentation if the note only says “arthritis” or if the diagnosis is uncertain.
Coding tip
Query for the involved site when the record says RA is present but does not specify location.