Deep endometriosis of ovary, unspecified ovary

This code signifies the presence of endometrial tissue deeply embedded within the ovarian stroma, without specifying which ovary is affected. This condition is a form of endometriosis where the ectopic endometrial implants penetrate more than 5 mm into the ovarian cortex. It can lead to significant pain, infertility, and the formation of endometriomas.

Apply this code when documentation confirms deep endometriosis involving an ovary, but the laterality (left or right) is not specified. This is appropriate when surgical pathology or imaging reports clearly identify deep ovarian involvement without laterality, or when the physician's diagnosis explicitly states "deep endometriosis of ovary, unspecified."

• Ensure documentation specifies "deep" involvement; superficial ovarian endometriosis codes are distinct.
• Avoid using this code if laterality is documented; instead, select the appropriate N80.121 (right) or N80.122 (left) code.
• Always sequence this code after any codes for associated complications, such as infertility (N97.x) or chronic pelvic pain (R10.2).