Endometriosis of pelvic peritoneum, oth sites, unsp depth

This code signifies the presence of endometrial tissue outside the uterus, specifically located on the pelvic peritoneum, but in a site other than the cul-de-sac, uterosacral ligament, or broad ligament. The depth of infiltration of this endometrial tissue is not specified in the clinical documentation.

Use this code when documentation confirms endometriosis affecting the pelvic peritoneum at a site not otherwise specified (e.g., pelvic sidewall, anterior peritoneum) and the depth of invasion is not recorded. This diagnosis is typically made via surgical visualization and biopsy.

• Ensure documentation specifies "pelvic peritoneum" and a site other than those with more specific codes (N80.31-N80.36).
• Do not use if the depth of endometriosis is documented (e.g., superficial, deep infiltrating), as more specific codes exist.
• Consider sequencing this code after any associated infertility or chronic pelvic pain, if applicable, as the underlying cause.