Transient synovitis, other site

This code signifies a temporary, non-infectious inflammation of the synovial membrane in a joint other than the hip. It is characterized by acute joint pain and swelling, typically resolving spontaneously without long-term sequelae.

Apply this code when documentation specifies transient synovitis affecting a joint such as the knee, ankle, shoulder, or elbow. It is commonly seen in pediatric patients following a viral illness or minor trauma, presenting with a limp or refusal to bear weight.

• Ensure the documentation explicitly states "transient synovitis" and specifies a joint site other than the hip.
• Differentiate from septic arthritis, which requires a different code and often involves systemic symptoms.
• Do not use for chronic or recurrent synovitis, which would necessitate a more specific diagnosis.