Synovial hypertrophy, NEC, multiple sites

This code signifies an abnormal overgrowth or thickening of the synovial membrane, which lines the joints, affecting multiple joints throughout the body. This hypertrophy can lead to joint pain, swelling, and reduced range of motion due to the increased synovial tissue. It is a non-specific finding, indicating the presence of synovial proliferation without identifying an underlying cause.

Use this code when documentation explicitly states "synovial hypertrophy" affecting more than one joint, and no more specific diagnosis (e.g., rheumatoid arthritis, gout) is provided or confirmed. This code is appropriate when the hypertrophy is a primary finding or a significant contributing factor to the patient's symptoms, and the underlying etiology remains unknown or unclassified.

• Ensure documentation specifies "multiple sites" or lists several affected joints to support the "multiple sites" specificity.
• Always sequence this code after a more definitive diagnosis if the synovial hypertrophy is a manifestation of an underlying systemic condition (e.g., inflammatory arthropathy).
• Avoid using this code if a more specific diagnosis for the synovial hypertrophy (e.g., pigmented villonodular synovitis, rheumatoid synovitis) is documented.