ICD-10 Code M05.821 – Other rheumatoid arthritis with rheumatoid factor of right elbow (2026): Diagnosis, Symptoms & Billing Guide
2026 ICD-10-CM Diagnosis Code M05.821 – Other rheumatoid arthritis with rheumatoid factor of right elbow
What it is
This code identifies rheumatoid arthritis with rheumatoid factor affecting the right elbow, when the record does not fit a more specific rheumatoid arthritis subtype. Use it for inflammatory joint disease documented in that exact location.
Clinical signs
Typical findings include chronic joint pain, swelling, stiffness, and reduced range of motion in the right elbow. Clinical features vary; refer to documentation for rheumatoid factor positivity and the specific joint involved.
When to use this code
Use this code when the provider documents rheumatoid arthritis with rheumatoid factor and specifies the right elbow as the affected site. It also applies when the note states “other rheumatoid arthritis” without a more precise subtype.
If the documentation names another joint, a different laterality, or a more specific rheumatoid arthritis category, you should not code M05.821. Check documentation when the site, laterality, or disease type is unclear.
Do not use for
Do not use it for rheumatoid arthritis without rheumatoid factor, or for elbow pain, swelling, or stiffness without a documented rheumatoid arthritis diagnosis. Do not use when the left elbow or an unspecified elbow is recorded.
Coding tip
Verify both rheumatoid factor involvement and right-sided elbow specificity before assigning M05.821.