ICD-10 Code M06.062 – Rheumatoid arthritis without rheumatoid factor, left knee (2026): Diagnosis, Symptoms & Billing Guide
2026 ICD-10-CM Diagnosis Code M06.062 – Rheumatoid arthritis without rheumatoid factor, left knee
What it is
This code identifies rheumatoid arthritis affecting the left knee when rheumatoid factor is not present. Use it for a documented seronegative rheumatoid arthritis diagnosis limited to, or specifically involving, the left knee.
Clinical signs
Typical findings include inflammatory joint pain, swelling, stiffness, and reduced range of motion in the left knee. Clinical features vary; refer to documentation for serologic status and joint involvement.
When to use this code
Use this code when the provider documents rheumatoid arthritis without rheumatoid factor and specifies the left knee. It is appropriate for encounters focused on that joint, including ongoing management or evaluation of documented disease.
If the record mentions rheumatoid arthritis but does not identify the left knee, or does not confirm absence of rheumatoid factor, check documentation before coding. You need both the seronegative status and laterality.
Do not use for
Do not use this code for osteoarthritis, traumatic knee pain, or rheumatoid arthritis with positive rheumatoid factor. Check documentation if the joint, laterality, or serologic status is unclear.
Coding tip
Confirm both “without rheumatoid factor” and “left knee” in the provider note before assigning M06.062.