ICD-10 Code M05.452 – Rheumatoid myopathy with rheumatoid arthritis of left hip (2026): Diagnosis, Symptoms & Billing Guide
2026 ICD-10-CM Diagnosis Code M05.452 – Rheumatoid myopathy with rheumatoid arthritis of left hip
What it is
This code identifies rheumatoid arthritis affecting the left hip, with associated rheumatoid myopathy. Use it when the record shows both inflammatory joint disease and muscle involvement in that same limb region.
Clinical signs
Typical findings include chronic inflammatory joint pain, stiffness, swelling, and reduced range of motion in the left hip. Muscle weakness or wasting related to rheumatoid disease may also be documented; clinical features vary, refer to documentation.
When to use this code
Use this code when the provider documents rheumatoid arthritis of the left hip together with rheumatoid myopathy. It is appropriate for outpatient, inpatient, or problem-list coding when the diagnosis is established and clearly linked in the note. If laterality or myopathy is unclear, check documentation.
Do not use for
Do not use this code for rheumatoid arthritis without muscle involvement, or for hip pain from non-rheumatoid causes. Do not assign it when the record names another joint, another side, or does not specify the left hip.
Coding tip
Confirm both components—rheumatoid arthritis and myopathy—are documented together, and verify left-sided laterality before coding.