ICD-10-CM 2027 diagnosis code
O00.21Ovarian pregnancy with intrauterine pregnancy
O00.21 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 FY2018 (effective October 1, 2017). Source: official FY2027 ICD-10-CM release from CDC/NCHS and CMS. Page updated September 29, 2026. About our data
About O00.21
O00.21 is the ICD-10-CM diagnosis code for ovarian pregnancy with intrauterine pregnancy. It belongs to category O00 (ectopic pregnancy), block O00-O08 (pregnancy with abortive outcome) and chapter 15 (pregnancy, childbirth and the puerperium). It is a header code, so it can't be reported by itself; one of its 3 subcodes must be used instead.
Within O00.2 (ovarian pregnancy), O00.21 is specifically for ovarian pregnancy with intrauterine pregnancy. Related codes cover without intrauterine pregnancy (O00.20).
To report this condition, pick the subcode that matches the documentation: O00.211 (pregnancy), O00.212 (pregnancy) and O00.219 (pregnancy).
Use an additional code from category O08 to identify any associated complication.
It was added in FY2017, effective October 1, 2016, and changed in FY2018.
Specific codes under O00.21
Notes that apply from higher levels
Instructions written at a parent level also apply to O00.21.
› From O00 Ectopic pregnancy
- ruptured ectopic pregnancy
- code from category O08 to identify any associated complication
Broader instructions also apply from O00-O08 Pregnancy with abortive outcome and Chapter 15: Pregnancy, childbirth and the puerperium.
Alphabetic index entries
2 entriesTerms in the official ICD-10-CM index that lead to O00.21.
Code history
- 2016
- 2017
- 2018
- 2019
- 2020
- 2021
- 2022
- 2023
- 2024
- 2025
- 2026
- 2027
- FY2017 (effective 10/1/2016): Added
- FY2018 (effective 10/1/2017): Expanded — no longer billable
Common questions about O00.21
Is O00.21 billable?
- No. O00.21 is a header code. Report one of its more specific subcodes instead.