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  5. Polyhydramnios (O40)

Polyhydramnios (O40)

ICD-10 code O40 and its subcodes are used to identify and classify different forms of polyhydramnios, a condition characterized by an excessive amount of amniotic fluid during pregnancy. These codes specify the trimester affected; first, second, or third; and differentiate cases involving one or more fetuses.

The ICD-10 code for polyhydramnios ranges from O40.1 for the first trimester, O40.2 for the second, and O40.3 for the third trimester, each with further subcodes indicating the fetus number when multiple pregnancies are involved. The unspecified trimester code O40.9 covers polyhydramnios cases when the pregnancy stage is unknown or unspecified. This comprehensive coding assists healthcare providers and coders in accurately documenting the timing and complexity of polyhydramnios cases, which may also be referenced under terms like "fetal disorder due to acute hydramnios" or "polyhydramnios due to maternal disease." This specificity supports precise diagnosis, treatment planning, and epidemiological tracking of polyhydramnios.

Instructional Notations

Includes

This note appears immediately under a three character code title to further define, or give examples of, the content of the category.

  • hydramnios

Type 1 Excludes

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.

  • encounter for suspected maternal and fetal conditions ruled out Z03.7

7th Character Note

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.

  • 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

Indicates that a seventh character is to be assigned to codes in a subcategory.

  • 0 - not applicable or unspecified
  • 1 - fetus 1
  • 2 - fetus 2
  • 3 - fetus 3
  • 4 - fetus 4
  • 5 - fetus 5
  • 9 - other fetus

Clinical Terms

The following clinical terms provide additional context, helping users better understand the clinical background and common associations for each diagnosis listed in this section. Including related terms alongside ICD-10-CM codes supports coders, billers, and healthcare professionals in improving accuracy, enhancing documentation, and facilitating research or patient education.

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.