ICD-10 Code M05.362 – Rheumatoid Heart Disease with Rheumatoid Arthritis of Left Knee (2026): Diagnosis, Symptoms & Billing Guide
2026 ICD-10-CM Diagnosis Code M05.362 – Rheumatoid heart disease with rheumatoid arthritis of left knee
What it is
This code identifies rheumatoid arthritis affecting the left knee in a patient who also has rheumatoid heart disease. Use it when the record clearly links both the joint disease and the cardiac involvement.
Clinical signs
Typical findings include inflammatory arthritis of the left knee, such as pain, swelling, stiffness, and reduced range of motion. Clinical features vary; refer to documentation for evidence of rheumatoid heart disease.
When to use this code
Use M05.362 when the provider documents rheumatoid arthritis of the left knee together with rheumatoid heart disease in the same patient. The diagnosis should be explicit, not assumed from a general rheumatoid arthritis history. If the heart disease is not documented, check documentation and code the more specific confirmed condition.
Do not use for
Do not use this code for rheumatoid arthritis without left knee involvement, or for isolated cardiac disease without documented rheumatoid heart disease. Do not assign it when the laterality or the heart involvement is unclear.
Coding tip
Verify both the left-knee site and the rheumatoid heart disease linkage in the provider note before selecting M05.362.