ICD-10-CM 2027 diagnosis code

O15Eclampsia

Not billable — use a more specific code

O15 is a header code, so it can't be reported by itself. Choose one of the 4 more specific codes beneath it.

Code unchanged since ICD-10-CM took effect on October 1, 2015. Source: official FY2027 ICD-10-CM release from CDC/NCHS and CMS. Page updated September 29, 2026. About our data

About O15

O15 is the ICD-10-CM diagnosis code for eclampsia. It belongs to block O10-O16 (edema, proteinuria and hypertensive disorders in pregnancy, childbirth and the puerperium) and chapter 15 (pregnancy, childbirth and the puerperium). It is a header code, so it can't be reported by itself; one of its 4 subcodes must be used instead.

To report this condition, pick the subcode that matches the documentation: O15.0 (complicating pregnancy), O15.1 (complicating labor), O15.2 (complicating the puerperium) and O15.9 (unspecified as to time period).

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 O15

Coding notes

IncludesFurther defines the content of the category

convulsions following conditions in O10-O14 and O16

Notes that apply from higher levels

Instructions written at a parent level also apply to O15.

Broader instructions also apply from Chapter 15: Pregnancy, childbirth and the puerperium.

Alphabetic index entries

1 entries

Terms in the official ICD-10-CM index that lead to O15.

Pregnancy (single) (uterine) › complicated by (care of) (management affected by) › eclampsia, eclamptic (coma) (convulsions) (delirium) (nephritis) (uremia)

Codes whose notes reference O15

I16.1Code also

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)
No changes since FY2016.

Common questions about O15

Is O15 billable?: No. O15 is a header code. Report one of its more specific subcodes instead.