Rheumatoid arthritis without rheumatoid factor, unsp hip

This code signifies a diagnosis of rheumatoid arthritis where laboratory tests for rheumatoid factor (RF) are negative, and the specific hip joint affected is not documented. It represents a seronegative form of chronic inflammatory arthritis primarily affecting the synovial joints, leading to pain, swelling, and potential joint destruction.

This code is appropriate when a patient presents with clinical signs and symptoms of rheumatoid arthritis, but RF testing is negative, and the medical record only specifies "hip" involvement without laterality (left or right) or further anatomical detail. Documentation should clearly state "seronegative rheumatoid arthritis" or "rheumatoid arthritis without rheumatoid factor" and mention hip involvement.

• Ensure documentation explicitly states "without rheumatoid factor" or "seronegative" to differentiate from seropositive forms.
• Avoid using this code if laterality (left or right hip) is specified; instead, use the more specific codes M06.051 or M06.052.
• Always sequence this code after any underlying cause or associated systemic conditions, if applicable.