Herpesviral infection of perianal skin and rectum

This code signifies a herpes simplex virus (HSV) infection affecting the skin around the anus and/or the lining of the rectum. It encompasses both primary and recurrent episodes of anogenital herpes specifically localized to these areas.

Apply this code when documentation explicitly states a diagnosis of herpesviral infection involving the perianal skin, the rectum, or both. This diagnosis is typically supported by clinical examination findings (e.g., vesicles, ulcers, erythema) and/or positive laboratory tests for HSV.

• Differentiate from other sexually transmitted infections (STIs) that may present with similar symptoms in the anogenital region.
• Ensure the documentation specifies "herpesviral" or "herpes simplex" and the affected anatomical sites (perianal, rectum).
• Do not use for herpes infections in other anatomical sites; specific codes exist for oral, genital (non-perianal/rectal), or disseminated herpes.