ICD-10 Code M05.772 – Rheumatoid arthritis with rheumatoid factor of left ankle and foot without organ or systems involvement (2026): Diagnosis, Symptoms & Billing Guide
2026 ICD-10-CM Diagnosis Code M05.772 – Rheumatoid arthritis with rheumatoid factor of left ankle and foot without organ or systems involvement
What it is
This code identifies rheumatoid arthritis with rheumatoid factor affecting the left ankle and foot, without documented involvement of other organs or body systems. Use it when the record clearly links the disease to the left ankle and foot.
Clinical signs
Typical findings include inflammatory joint pain, swelling, stiffness, and reduced motion in the left ankle or foot. Clinical features vary; refer to documentation for confirmation of rheumatoid factor and site involvement.
When to use this code
Use this code when the provider documents rheumatoid arthritis with rheumatoid factor and specifies the left ankle and foot as the affected site. It also requires documentation that no organ or systemic involvement is present.
If the note only says rheumatoid arthritis, or does not identify the left side, ankle, or foot, check documentation before assigning this code. Do not assume laterality or systemic status from imaging alone.
Do not use for
Do not use this code for rheumatoid arthritis without rheumatoid factor, or when the affected site is not the left ankle and foot. Check documentation if organ or systemic involvement is reported.
Coding tip
Verify both laterality and the absence of organ or systemic involvement before coding M05.772.