Tibial collateral bursitis [Pellegrini-Stieda], right leg

This code describes inflammation of the bursa located near the medial collateral ligament (MCL) of the right knee, often associated with the Pellegrini-Stieda syndrome, which involves calcification of the MCL. It presents as localized pain, swelling, and tenderness on the medial aspect of the right knee.

Use this code when documentation specifies bursitis affecting the tibial collateral ligament on the right leg, particularly if Pellegrini-Stieda syndrome is also noted or suspected. Supporting documentation includes physician notes detailing physical exam findings (e.g., tenderness over the MCL insertion), imaging reports (e.g., ultrasound, X-ray showing calcification), and a clear diagnosis of right tibial collateral bursitis.

• Ensure laterality is clearly documented as "right leg" to avoid incorrect coding.
• Distinguish from MCL sprains or tears (S83.4- codes) which involve ligamentous injury rather than bursal inflammation.
• If Pellegrini-Stieda syndrome is explicitly diagnosed and involves calcification, consider additional codes for calcification if separately documented and clinically significant.