Rheumatoid arthritis w/o rheumatoid factor, multiple sites

This code signifies a chronic autoimmune inflammatory condition affecting multiple joints, characterized by the absence of rheumatoid factor (RF) in diagnostic testing. It indicates a seronegative form of rheumatoid arthritis impacting various anatomical locations throughout the body.

Apply this code when documentation explicitly states a diagnosis of seronegative rheumatoid arthritis affecting more than one joint. This diagnosis is typically supported by clinical findings, imaging, and laboratory results confirming the absence of RF.

• Ensure documentation specifies "seronegative" or "without rheumatoid factor" to differentiate from seropositive forms.
• Confirm that multiple joint sites are affected; if only one site is involved, a more specific code for that site should be used.
• Do not use this code if the patient has tested positive for rheumatoid factor; refer to codes for seropositive rheumatoid arthritis.