Abn rheu fctr & anti-citrul protein antibody w rheu arthrit

This code signifies a diagnosis of rheumatoid arthritis (RA) in a patient who also exhibits abnormal levels of both rheumatoid factor (RF) and anti-citrullinated protein antibodies (ACPA). It indicates a specific serological profile associated with RA, often correlating with more severe disease.

Use this code when documentation clearly states a diagnosis of rheumatoid arthritis and laboratory results confirm the presence of both elevated rheumatoid factor and positive anti-citrullinated protein antibodies. This code is appropriate when the clinician explicitly links these serological findings to the RA diagnosis.

• Ensure documentation specifies both abnormal RF and ACPA in conjunction with the RA diagnosis.
• Do not use this code if only one of the serological markers (RF or ACPA) is abnormal, or if the RA diagnosis is not confirmed.
• This code is more specific than M05.0 (Seropositive rheumatoid arthritis with rheumatoid factor) or M05.1 (Seropositive rheumatoid arthritis with anti-citrullinated protein antibody), so use it when both are present.