ICD-10-CM > M00-M99 > M05-M14 > M05 > M05.A M05.A Abnormal rheumatoid factor and anti-citrullinated protein antibody with rheumatoid arthritis Billable/Specific Copy Code Copy Description Code First rheumatoid arthritis with rheumatoid factor by site, if known (M05.00 to M05.8A)
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