2025
ICD-10-CM
Diagnosis
Code

O40 Polyhydramnios

  • Non-billable
  • 2016–2025

O40 is a non-billable/non-specific diagnosis code from the 2025 ICD-10-CM used to classify the following condition: Polyhydramnios.

Includes

  • Hydramnios

Type 1 excludes

  • Encounter for suspected maternal and fetal conditions ruled out (Z03.7-)

Seventh character note

  • One of the following 7th characters is to be assigned to each code under category O40. 7th character 0 is for single gestations and multiple gestations where the fetus is unspecified. 7th characters 1 through 9 are for cases of multiple gestations to identify the fetus for which the code applies. The appropriate code from category O30, Multiple gestation, must also be assigned when assigning a code from category O40 that has a 7th character of 1 through 9.

Seventh character extensions

  • 0: not applicable or unspecified

  • 1: fetus 1

  • 2: fetus 2

  • 3: fetus 3

  • 4: fetus 4

  • 5: fetus 5

  • 9: other fetus

Codes

Versions

  1. 2025

    No changes

  2. 2024

    No changes

  3. 2023

    No changes

  4. 2022

    No changes

  5. 2021

    No changes

  6. 2020

    No changes

  7. 2019

    No changes

  8. 2018

    No changes

  9. 2017

    No changes

  10. 2016

    New code