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ICD-10-CM 2027 diagnosis code

O00.3Cesarean scar ectopic pregnancy

Not billable — use a more specific codeNew for 2027

O00.3 is a header code, so it can't be reported by itself. Choose one of the 2 more specific codes beneath it.

Code last changed in FY2027 (effective October 1, 2026). Source: official FY2027 ICD-10-CM release from CDC/NCHS and CMS. Page updated September 29, 2026. About our data

About O00.3

O00.3 is the ICD-10-CM diagnosis code for cesarean scar ectopic 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 2 subcodes must be used instead.

Within O00 (ectopic pregnancy), O00.3 is specifically for cesarean scar ectopic pregnancy. Related codes cover abdominal pregnancy (O00.0), tubal pregnancy (O00.1), ovarian pregnancy (O00.2), cervical ectopic pregnancy (O00.4), cornual ectopic pregnancy (O00.5), other ectopic pregnancy (O00.8) and unspecified (O00.9).

To report this condition, pick the subcode that matches the documentation: O00.31 (without intrauterine pregnancy) and O00.32 (with intrauterine pregnancy).

Use an additional code from category O08 to identify any associated complication.

It was added in FY2027, effective October 1, 2026.

Specific codes under O00.3

Notes that apply from higher levels

Instructions written at a parent level also apply to O00.3.

› From O00 Ectopic pregnancy
Includes
  • ruptured ectopic pregnancy
Use additional code
  • 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.

Code history

  1. 2016
  2. 2017
  3. 2018
  4. 2019
  5. 2020
  6. 2021
  7. 2022
  8. 2023
  9. 2024
  10. 2025
  11. 2026
  12. 2027
  • FY2027 (effective 10/1/2026): Added

Common questions about O00.3

Is O00.3 billable?

No. O00.3 is a header code. Report one of its more specific subcodes instead.

Did O00.3 change for 2027?

Yes. For FY2027 (effective October 1, 2026) it was added to the code set.