ICD-10 Code M05.812 – Other rheumatoid arthritis with rheumatoid factor of left shoulder (2026): Diagnosis, Symptoms & Billing Guide
2026 ICD-10-CM Diagnosis Code M05.812 – Other rheumatoid arthritis with rheumatoid factor of left shoulder
What it is
This code identifies rheumatoid arthritis affecting the left shoulder when rheumatoid factor is present and the condition is not described by a more specific rheumatoid arthritis code. It signals inflammatory joint disease documented in the left shoulder.
Clinical signs
Typical findings include shoulder pain, stiffness, swelling, and reduced range of motion. Clinical features vary; refer to documentation for confirmation of rheumatoid factor positivity and left shoulder involvement.
When to use this code
Use this code when the record clearly documents rheumatoid arthritis with rheumatoid factor and specifies the left shoulder as the affected site. It may apply to outpatient, inpatient, or specialty notes when the diagnosis is established. If the chart only says rheumatoid arthritis without laterality or factor status, check documentation.
Do not use for
Do not use it for rheumatoid arthritis without rheumatoid factor, or when the shoulder side is not documented. Do not substitute it for other shoulder disorders, such as degenerative or traumatic conditions.
Coding tip
Verify both the rheumatoid factor status and left-sided shoulder documentation before assigning M05.812.