ICD-10 Code M05.81 – Other rheumatoid arthritis with rheumatoid factor of shoulder (2026): Diagnosis, Symptoms & Billing Guide
2026 ICD-10-CM Diagnosis Code M05.81 – Other rheumatoid arthritis with rheumatoid factor of shoulder
What it is
This code identifies rheumatoid arthritis affecting the shoulder when rheumatoid factor is present, but the presentation does not fit a more specific rheumatoid arthritis code. Use it for documented RA involving the shoulder joint.
Clinical signs
Typical findings include chronic inflammatory joint pain, stiffness, swelling, and reduced shoulder range of motion. Clinical features vary; refer to documentation.
When to use this code
Use this code when the record clearly documents rheumatoid arthritis with rheumatoid factor involving the shoulder. It is appropriate when the provider specifies the shoulder as the affected site and no more specific rheumatoid arthritis subtype is named.
Check documentation if the note mentions multiple joints, unspecified RA, or a different rheumatoid arthritis category. Code only what the clinician documents.
Do not use for
Do not use it for shoulder pain, osteoarthritis, or rheumatoid arthritis without rheumatoid factor. It is also incorrect when the chart identifies a different joint or a more specific RA code.
Coding tip
Verify both the rheumatoid factor association and the shoulder site in the provider note before assigning M05.81.