2026 ICD-10-CM Diagnosis Code O40Polyhydramnios
O40 is a non-billable ICD-10-CM category code for polyhydramnios, so it cannot be submitted on claims. Use a more specific code from this category instead, such as O40.1XX0, O40.1XX1, O40.1XX2, and O40.1XX3.
Code Identity
Code Classification
Specific Coding for PolyhydramniosOverview
Tabular List NotesGuidance
Coding notes and annotation back-references applicable to this code.
Includes
- hydramnios
Type 1 Excludes
- encounter for suspected maternal and fetal conditions ruled out Z03.7
7th 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
7th Character
- 0 - not applicable or unspecified
- 1 - fetus 1
- 2 - fetus 2
- 3 - fetus 3
- 4 - fetus 4
- 5 - fetus 5
- 9 - other fetus
This note appears immediately under a three character code title to further define, or give examples of, the content of the category.
A type 1 excludes note is a pure excludes note. It means "NOT CODED HERE!" An Excludes1 note indicates that the code excluded should never be used at the same time as the code above the Excludes1 note. An Excludes1 is used when two conditions cannot occur together, such as a congenital form versus an acquired form of the same condition.
Certain ICD-10-CM categories have applicable 7th characters. The applicable 7th character is required for all codes within the category, or as the notes in the Tabular List instruct. The 7th character must always be the 7th character in the data field. If a code that requires a 7th character is not 6 characters, a placeholder X must be used to fill in the empty characters.
Indicates that a seventh character is to be assigned to codes in a subcategory.
Index to Diseases and InjuriesGuidance
Alphabetical index entries that point to this code.
- Pregnancy (single) (uterine) - See Also: Delivery and Puerperal; - Z33.1
External Cause of Injuries IndexGuidance
References for this code in the External Cause of Injuries Index.
- Pregnancy(single) (uterine)
- complicated by (care of) (management affected by)
- polyhydramnios
Clinical InformationClinical
Polyhydramnios
a condition of abnormally high amniotic fluid volume, such as greater than 2,000 ml in the last trimester and usually diagnosed by ultrasonographic criteria (amniotic fluid index). it is associated with maternal diabetes mellitus; multiple pregnancy; chromosomal disorders; and congenital abnormalities.
Patient EducationClinical
Health Problems in Pregnancy
A health problem in pregnancy is any disease or condition that could affect your health or the health of your fetus. Some health problems may make it more likely that you will have a high-risk pregnancy. A high-risk pregnancy is one in which you, your fetus, or both are at higher risk for health problems than in a typical pregnancy.
The full article covers:
- What are health problems in pregnancy?
- What raises my risk for health problems during pregnancy?
- Can chronic health conditions cause problems in pregnancy?
- Can health problems in pregnancy be prevented?
Read the full article at MedlinePlus
Courtesy of MedlinePlus, a service of the U.S. National Library of Medicine.
