Felty's syndrome, unspecified ankle and foot

This code signifies Felty's syndrome, a rare and severe manifestation of rheumatoid arthritis characterized by the triad of seropositive rheumatoid arthritis, splenomegaly, and neutropenia. This specific code is used when the ankle and foot are affected, but the laterality (right, left, or bilateral) is not specified in the medical record.

Apply this code when documentation clearly states a diagnosis of Felty's syndrome with involvement of the ankle and/or foot, and the specific side is not documented. It is appropriate for patients presenting with symptoms such as joint pain, swelling, and stiffness in the ankle and foot, in conjunction with systemic signs of Felty's syndrome.

• Always attempt to clarify laterality (right, left, bilateral) with the provider if not documented, as more specific codes exist.
• Code the underlying rheumatoid arthritis (M05.-) as the primary diagnosis, followed by this code for the manifestation.
• Ensure documentation supports the presence of splenomegaly and neutropenia for a definitive diagnosis of Felty's syndrome.