ICD-10-CM O40: Polyhydramnios

ICD-10-CM Diagnosis Code (2025)

Official Description for O40

Polyhydramnios

Coding Notes & Guidelines for O40

Includes Notes

hydramnios

Excludes1: Not Coded Here

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

7th Character Guidance

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.

7th Character Definitions
  • 0: not applicable or unspecified
  • 1: fetus 1
  • 2: fetus 2
  • 3: fetus 3
  • 4: fetus 4
  • 5: fetus 5
  • 9: other fetus

Child Codes (More Specific Codes for O40):

O40.1 - Polyhydramnios, first trimester O40.2 - Polyhydramnios, second trimester O40.3 - Polyhydramnios, third trimester O40.9 - Polyhydramnios, unspecified trimester

About ICD-10-CM Code O40 (Polyhydramnios)

ICD-10-CM code O40 is a billable or specific ICD-10-CM code that can be used to indicate a diagnosis for reimbursement purposes. The 2025 edition of ICD-10-CM O40 became effective on October 1, 2024.

This page provides detailed information about O40 - Polyhydramnios. It includes common terminology, coding guidelines such as "Includes," "Excludes1," and "Excludes2" notes, and information on required 7th characters. Utilizing this information correctly is essential for accurate medical coding and claims submission for conditions like Polyhydramnios.