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ICD-10-CM 2027

ICD-10 code for thorax endometriosis

N80.B

Endometriosis of cardiothoracic space

Header — needs a more specific code

From the official ICD-10-CM alphabetic index entry “Endometriosis › thorax”. Page updated September 29, 2026.

About coding thorax endometriosis

The ICD-10-CM code for thorax endometriosis is N80.B (Endometriosis of cardiothoracic space).

Within N80 (endometriosis), N80.B is specifically for endometriosis of cardiothoracic space. Related codes cover of uterus (N80.0), of ovary (N80.1), of fallopian tube (N80.2), of pelvic peritoneum (N80.3), of rectovaginal septum and vagina (N80.4), of intestine (N80.5), in cutaneous scar (N80.6), other endometriosis (N80.8) and 4 more.

To report this condition, pick the subcode that matches the documentation: N80.B1 (pleura), N80.B2 (lung), N80.B3 (diaphragm), N80.B4 (space), N80.B5 (space) and N80.B6 (space).

It was added in FY2023, effective October 1, 2022.

Common questions about thorax endometriosis ICD-10 codes

What is the ICD-10 code for thorax endometriosis?

N80.B — Endometriosis of cardiothoracic space (a header code; report a more specific subcode).

Is N80.B billable?

No. N80.B is a header code. Report one of its more specific subcodes instead.