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O40

⚠ Non-billable (Header)

Polyhydramnios

Pregnancy, childbirth and the puerperium (O00-O9A)

⚠️ This is a category header code — not billable. Use a more specific child code below.

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✅ Includes

  • • hydramnios

❌ Excludes1

direct

Cannot be coded with O40

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

Child Codes (4)

O40.1Polyhydramnios, first trimesterO40.2Polyhydramnios, second trimesterO40.3Polyhydramnios, third trimesterO40.9Polyhydramnios, unspecified trimester

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Code Information

CodeO40
BillableNo — Header code
CategoryPregnancy, childbirth and the puerperium (O00-O9A)
Excludes11 rule(s)
Excludes20 note(s)
Child codes4

Data Source

CMS ICD-10-CM 2026 Tabular List

Updated October 1, 2025 (FY2026)