Synovial hypertrophy, NEC, unsp upper arm

This code signifies an abnormal overgrowth of the synovial membrane, the tissue lining the joint capsule, in an unspecified upper arm. This hypertrophy is not attributable to other specific conditions like rheumatoid arthritis or infection. It typically results in joint swelling, pain, and restricted movement.

Apply this code when documentation specifies synovial hypertrophy in the upper arm, but the laterality (right or left) is not recorded. This diagnosis is often made via imaging studies such as MRI or ultrasound, or during arthroscopy, confirming the synovial thickening without a more specific underlying cause.

• Ensure documentation clearly states "unspecified upper arm" or lacks laterality for the affected arm.
• If laterality is documented (e.g., right or left upper arm), use the more specific code (M67.221 or M67.222).
• Always review the medical record for any underlying conditions that might cause synovial hypertrophy, as these would be coded first if applicable.