Mumps orchitis

This code signifies inflammation of one or both testicles caused by the mumps virus. It is a common complication of mumps, particularly in post-pubertal males, and can lead to testicular atrophy and infertility.

Apply this code when documentation explicitly states a diagnosis of orchitis directly attributed to a mumps infection. This typically occurs in the context of an active mumps case or a recent history of mumps with subsequent development of testicular inflammation.

• Ensure the documentation clearly links the orchitis to mumps; do not assume causality.
• Do not confuse with orchitis due to other infectious agents (e.g., bacterial) or non-infectious causes.
• Sequence this code as the primary diagnosis if it is the reason for the encounter, otherwise, sequence after the mumps infection code (B26.9).