U.S. ICD-10-CM reference · FY2027
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O40Category · further specificity requiredCurrent

Polyhydramnios

HierarchyO30-O48 · O40

Code-level instructions

Includes

hydramnios

Excludes 1

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

Seventh character

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.

0 — not applicable or unspecified

1 — fetus 1

2 — fetus 2

3 — fetus 3

4 — fetus 4

5 — fetus 5

9 — other fetus

Inherited instructions

Chapters 15 · Pregnancy, childbirth and the puerperium (O00-O9A)

Excludes 1

supervision of normal pregnancy (Z34.-)

Excludes 2
  • mental and behavioral disorders associated with the puerperium (F53.-)
  • obstetrical tetanus (A34)
  • postpartum necrosis of pituitary gland (E23.0)
  • puerperal osteomalacia (M83.0)
Use additional code

code, if applicable, from category Z3A, Weeks of gestation, to identify the specific week of the pregnancy, if known.

Note
  • CODES FROM THIS CHAPTER ARE FOR USE ONLY ON MATERNAL RECORDS, NEVER ON NEWBORN RECORDS
  • Codes from this chapter are for use for conditions related to or aggravated by the pregnancy, childbirth, or by the puerperium (maternal causes or obstetric causes)
  • Trimesters are counted from the first day of the last menstrual period. They are defined as follows:
  • 1st trimester- less than 14 weeks 0 days
  • 2nd trimester- 14 weeks 0 days to less than 28 weeks 0 days
  • 3rd trimester- 28 weeks 0 days until delivery

More specific codes

O40.1Polyhydramnios, first trimesterCategory · further specificity requiredO40.2Polyhydramnios, second trimesterCategory · further specificity requiredO40.3Polyhydramnios, third trimesterCategory · further specificity requiredO40.9Polyhydramnios, unspecified trimesterCategory · further specificity required
Code edition