ICD-10-CM 2027 diagnosis code
N80.1Endometriosis of ovary
N80.1 is a header code, so it can't be reported by itself. Choose one of the 3 more specific codes beneath it.
Code last changed in FY2023 (effective October 1, 2022). Source: official FY2027 ICD-10-CM release from CDC/NCHS and CMS. Page updated September 29, 2026. About our data
About N80.1
N80.1 is the ICD-10-CM diagnosis code for endometriosis of ovary. It belongs to category N80 (endometriosis), block N80-N98 (noninflammatory disorders of female genital tract) and chapter 14 (diseases of the genitourinary system). It is a header code, so it can't be reported by itself; one of its 3 subcodes must be used instead.
Within N80 (endometriosis), N80.1 is specifically for endometriosis of ovary. Related codes cover of uterus (N80.0), 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), unspecified (N80.9) and 4 more.
To report this condition, pick the subcode that matches the documentation: N80.10 (unspecified depth), N80.11 (ovary) and N80.12 (ovary).
It has been part of ICD-10-CM since the code set took effect on October 1, 2015, and changed in FY2023 (expanded into subcodes).
Before ICD-10, this condition was coded in ICD-9-CM as 617.1 (endometriosis of ovary).
Specific codes under N80.1
Notes that apply from higher levels
Instructions written at a parent level also apply to N80.1.
Broader instructions also apply from Chapter 14: Diseases of the genitourinary system.
Codes whose notes reference N80.1
- D27Excludes2
ICD-9-CM equivalent
Converter →- 617.1Endometriosis of ovaryexact
From the CMS 2018 General Equivalence Mappings (GEMs), the final GEMs release.
Code history
- 2016
- 2017
- 2018
- 2019
- 2020
- 2021
- 2022
- 2023
- 2024
- 2025
- 2026
- 2027
- FY2016 (effective 10/1/2015): Added (first year of ICD-10-CM)
- FY2023 (effective 10/1/2022): Expanded — no longer billable