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ICD-10-CM 2027 diagnosis code

O00Ectopic pregnancy

Not billable — use a more specific code

O00 is a header code, so it can't be reported by itself. Choose one of the 8 more specific codes beneath it.

Source: official FY2027 ICD-10-CM release from CDC/NCHS and CMS, effective October 1, 2026. Updated September 29, 2026. About our data

About O00

O00 is the ICD-10-CM diagnosis code for ectopic pregnancy. It belongs to 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 8 subcodes must be used instead.

To report this condition, pick the subcode that matches the documentation: O00.0 (pregnancy), O00.1 (pregnancy), O00.2 (pregnancy), O00.3 (pregnancy), O00.4 (pregnancy), O00.5 (pregnancy), O00.8 (pregnancy) and O00.9 (unspecified).

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

It has been part of ICD-10-CM since the code set took effect on October 1, 2015 and hasn't changed since.

Specific codes under O00

Coding notes

IncludesFurther defines the content of the category
  • ruptured ectopic pregnancy
Use additional codeAdd a secondary code to fully describe the condition
  • code from category O08 to identify any associated complication

Notes that apply from higher levels

Instructions written at a parent level also apply to O00.

Broader instructions also apply from O00-O08 Pregnancy with abortive outcome and Chapter 15: Pregnancy, childbirth and the puerperium.

Codes whose notes reference O00

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
  • FY2016 (effective 10/1/2015): Added (first year of ICD-10-CM)
  • No changes since FY2016.

Common questions about O00

Is O00 billable?

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