ICD-10-CM Code For Polyhydramnios: Group Overview

The International Classification of Diseases, Tenth Revision, Clinical Modification (ICD-10-CM) code group O40 includes diagnoses for polyhydramnios, covering excessive accumulation of amniotic fluid and its subtypes such as mild, moderate, severe, and specified or unspecified timing relative to labor and delivery. These ICD-10-CM diagnosis codes are used to document maternal-fetal conditions that affect pregnancy management, capturing severity, timing, and associated complications relevant to maternal and fetal care. Accurate coding within the ICD-10-CM O40 group supports proper claim adjudication, complete clinical documentation, and appropriate reimbursement.

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ICD-10-CM O40: Polyhydramnios Overview

The International Classification of Diseases, Tenth Revision, Clinical Modification (ICD-10-CM) code group O40 covers polyhydramnios, an excessive accumulation of amniotic fluid during pregnancy that can affect fetal and maternal outcomes. These diagnoses target the amniotic cavity and fetal environment and are part of maternal care related to potential delivery problems. Accurate coding is important for reflecting clinical complexity and supporting appropriate reimbursement and continuity of care.

When to Use

Use a code from this group when clinical assessment documents an excessive volume of amniotic fluid during pregnancy and the provider records the level of severity or specifies timing relative to labor. Select the most specific code available to reflect associated complications, severity, and whether the condition is antepartum or during labor and delivery.

ICD-10-CM Codes

28 rows

ICD-10-CM Code	Description
O40.1XX0	Polyhydramnios, first trimester, not applicable or unspecified
O40.1XX1	Polyhydramnios, first trimester, fetus 1
O40.1XX2	Polyhydramnios, first trimester, fetus 2
O40.1XX3	Polyhydramnios, first trimester, fetus 3
O40.1XX4	Polyhydramnios, first trimester, fetus 4
O40.1XX5	Polyhydramnios, first trimester, fetus 5
O40.1XX9	Polyhydramnios, first trimester, other fetus
O40.2XX0	Polyhydramnios, second trimester, not applicable or unspecified
O40.2XX1	Polyhydramnios, second trimester, fetus 1
O40.2XX2	Polyhydramnios, second trimester, fetus 2
O40.2XX3	Polyhydramnios, second trimester, fetus 3
O40.2XX4	Polyhydramnios, second trimester, fetus 4
O40.2XX5	Polyhydramnios, second trimester, fetus 5
O40.2XX9	Polyhydramnios, second trimester, other fetus
O40.3XX0	Polyhydramnios, third trimester, not applicable or unspecified
O40.3XX1	Polyhydramnios, third trimester, fetus 1
O40.3XX2	Polyhydramnios, third trimester, fetus 2
O40.3XX3	Polyhydramnios, third trimester, fetus 3
O40.3XX4	Polyhydramnios, third trimester, fetus 4
O40.3XX5	Polyhydramnios, third trimester, fetus 5

Showing 1–20 of 28

DRG Codes

6 rows

DRG Code	Description
817	Other Antepartum Diagnoses with O.R. Procedures with MCC
818	Other Antepartum Diagnoses with O.R. Procedures with CC
819	Other Antepartum Diagnoses with O.R. Procedures without CC/MCC
831	Other Antepartum Diagnoses without O.R. Procedures with MCC
832	Other Antepartum Diagnoses without O.R. Procedures with CC
833	Other Antepartum Diagnoses without O.R. Procedures without CC/MCC

Typical Clinical Scenarios

A 34-year-old pregnant woman at 34 weeks’ gestation presents to labor and delivery with progressive abdominal discomfort, rapid uterine growth on fundal height measurement, and dyspnea. Ultrasound shows an amniotic fluid index (AFI) >25 cm without evidence of fetal anomalies, and fetal monitoring demonstrates reassuring heart rate patterns; evaluation attributes the excess fluid to idiopathic polyhydramnios that requires serial monitoring and possible induction planning. Typical codes: O40.1XX3, O40.1XX0
A 29-year-old woman at 30 weeks’ gestation with poorly controlled gestational diabetes is referred for fetal ultrasound after decreased fetal movements; ultrasound reveals a markedly elevated AFI with macrosomic fetal measurements and signs of maternal respiratory compromise from the distended uterus. Because polyhydramnios is associated with maternal diabetes and may precipitate preterm labor or need for inpatient management, a code reflecting polyhydramnios associated with diabetes is assigned. Typical codes: O40.2XX3, O40.2XX1
A 26-year-old primigravida at 28 weeks is admitted emergently for preterm labor after sudden onset of severe abdominal pain and uterine tenderness; ultrasound demonstrates polyhydramnios with suspected placental abruption and nonreassuring fetal testing, complicating delivery planning. In this acute complication scenario, polyhydramnios is coded alongside the obstetric emergency because the excess fluid contributed to maternal-fetal instability and delivery decisions. Typical codes: O40.3XX3, O40.3XX9

Related Codes

O30-MULTIPLE-GESTATION-PREGNANCY

ICD-10-CM Code For Multiple Gestation: Group Overview

O31-COMPLICATIONS-SPECIFIC-TO-MULTIPLE-GESTATION

ICD-10-CM Code For Complications Specific To Multiple Gestation: Group Overview

O32-MALPRESENTATION-OF-FETUS

ICD-10-CM Code For Maternal Care For Malpresentation Of Fetus: Group Overview

O33-MATERNAL-CARE-FOR-DISPROPORTION

ICD-10-CM Code For Maternal Care For Disproportion: Group Overview

O34-ABNORMALITY-OF-PELVIC-ORGANS

ICD-10-CM Code For Maternal Care For Abnormality Of Pelvic Organs: Group Overview

O35-MATERNAL-CARE-FOR-FETAL-ABNORMALITY

ICD-10-CM Code For Maternal Care For Known Or Suspected Fetal Abnormality And Damage: Group Overview

O36-MATERNAL-CARE-OTHER-FETAL-PROBLEMS

ICD-10-CM Code For Maternal Care For Other Fetal Problems: Group Overview

O41-OTHER-DISORDERS-OF-AMNIOTIC-FLUID

ICD-10-CM Code For Other Disorders Of Amniotic Fluid And Membranes: Group Overview

O42-PREMATURE-RUPTURE-OF-MEMBRANES

ICD-10-CM Code For Premature Rupture Of Membranes: Group Overview

O43-PLACENTAL-DISORDERS

ICD-10-CM Code For Placental Disorders: Group Overview

Showing 1–10 of 15

Frequently Asked Questions

References

1.CPT® Codes and Descriptions. AAPC. Retrieved Aug 11, 2026.Maintains the CPT code set's official descriptions and guidelines, licensed from the American Medical Association, used as the definitional source for CPT codes on this page.
2.HCPCS Quarterly Update. Centers for Medicare & Medicaid Services (CMS). Retrieved Aug 11, 2026.CMS's quarterly release of HCPCS Level II codes and short/long descriptors, the source for HCPCS code definitions and update history.
3.ICD-10-CM Full Code List. Centers for Medicare & Medicaid Services (CMS). Retrieved Aug 11, 2026.CMS's complete ICD-10-CM diagnosis code list, used to cross-reference diagnosis codes associated with this procedure or service.

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When to Use

ICD-10-CM Codes

28 rows

ICD-10-CM Code	Description
O40.1XX0	Polyhydramnios, first trimester, not applicable or unspecified
O40.1XX1	Polyhydramnios, first trimester, fetus 1
O40.1XX2	Polyhydramnios, first trimester, fetus 2
O40.1XX3	Polyhydramnios, first trimester, fetus 3
O40.1XX4	Polyhydramnios, first trimester, fetus 4
O40.1XX5	Polyhydramnios, first trimester, fetus 5
O40.1XX9	Polyhydramnios, first trimester, other fetus
O40.2XX0	Polyhydramnios, second trimester, not applicable or unspecified
O40.2XX1	Polyhydramnios, second trimester, fetus 1
O40.2XX2	Polyhydramnios, second trimester, fetus 2
O40.2XX3	Polyhydramnios, second trimester, fetus 3
O40.2XX4	Polyhydramnios, second trimester, fetus 4
O40.2XX5	Polyhydramnios, second trimester, fetus 5
O40.2XX9	Polyhydramnios, second trimester, other fetus
O40.3XX0	Polyhydramnios, third trimester, not applicable or unspecified
O40.3XX1	Polyhydramnios, third trimester, fetus 1
O40.3XX2	Polyhydramnios, third trimester, fetus 2
O40.3XX3	Polyhydramnios, third trimester, fetus 3
O40.3XX4	Polyhydramnios, third trimester, fetus 4
O40.3XX5	Polyhydramnios, third trimester, fetus 5

Showing 1–20 of 28

DRG Codes

6 rows

DRG Code	Description
817	Other Antepartum Diagnoses with O.R. Procedures with MCC
818	Other Antepartum Diagnoses with O.R. Procedures with CC
819	Other Antepartum Diagnoses with O.R. Procedures without CC/MCC
831	Other Antepartum Diagnoses without O.R. Procedures with MCC
832	Other Antepartum Diagnoses without O.R. Procedures with CC
833	Other Antepartum Diagnoses without O.R. Procedures without CC/MCC

Typical Clinical Scenarios

A 34-year-old pregnant woman at 34 weeks’ gestation presents to labor and delivery with progressive abdominal discomfort, rapid uterine growth on fundal height measurement, and dyspnea. Ultrasound shows an amniotic fluid index (AFI) >25 cm without evidence of fetal anomalies, and fetal monitoring demonstrates reassuring heart rate patterns; evaluation attributes the excess fluid to idiopathic polyhydramnios that requires serial monitoring and possible induction planning. Typical codes: O40.1XX3, O40.1XX0
A 29-year-old woman at 30 weeks’ gestation with poorly controlled gestational diabetes is referred for fetal ultrasound after decreased fetal movements; ultrasound reveals a markedly elevated AFI with macrosomic fetal measurements and signs of maternal respiratory compromise from the distended uterus. Because polyhydramnios is associated with maternal diabetes and may precipitate preterm labor or need for inpatient management, a code reflecting polyhydramnios associated with diabetes is assigned. Typical codes: O40.2XX3, O40.2XX1
A 26-year-old primigravida at 28 weeks is admitted emergently for preterm labor after sudden onset of severe abdominal pain and uterine tenderness; ultrasound demonstrates polyhydramnios with suspected placental abruption and nonreassuring fetal testing, complicating delivery planning. In this acute complication scenario, polyhydramnios is coded alongside the obstetric emergency because the excess fluid contributed to maternal-fetal instability and delivery decisions. Typical codes: O40.3XX3, O40.3XX9

Related Codes

O30-MULTIPLE-GESTATION-PREGNANCY

ICD-10-CM Code For Multiple Gestation: Group Overview

O31-COMPLICATIONS-SPECIFIC-TO-MULTIPLE-GESTATION

ICD-10-CM Code For Complications Specific To Multiple Gestation: Group Overview

O32-MALPRESENTATION-OF-FETUS

ICD-10-CM Code For Maternal Care For Malpresentation Of Fetus: Group Overview

O33-MATERNAL-CARE-FOR-DISPROPORTION

ICD-10-CM Code For Maternal Care For Disproportion: Group Overview

O34-ABNORMALITY-OF-PELVIC-ORGANS

ICD-10-CM Code For Maternal Care For Abnormality Of Pelvic Organs: Group Overview

O35-MATERNAL-CARE-FOR-FETAL-ABNORMALITY

ICD-10-CM Code For Maternal Care For Known Or Suspected Fetal Abnormality And Damage: Group Overview

O36-MATERNAL-CARE-OTHER-FETAL-PROBLEMS

ICD-10-CM Code For Maternal Care For Other Fetal Problems: Group Overview

O41-OTHER-DISORDERS-OF-AMNIOTIC-FLUID

ICD-10-CM Code For Other Disorders Of Amniotic Fluid And Membranes: Group Overview

O42-PREMATURE-RUPTURE-OF-MEMBRANES

ICD-10-CM Code For Premature Rupture Of Membranes: Group Overview

O43-PLACENTAL-DISORDERS

ICD-10-CM Code For Placental Disorders: Group Overview

Showing 1–10 of 15

Frequently Asked Questions

References

1.CPT® Codes and Descriptions. AAPC. Retrieved Aug 11, 2026.Maintains the CPT code set's official descriptions and guidelines, licensed from the American Medical Association, used as the definitional source for CPT codes on this page.
2.HCPCS Quarterly Update. Centers for Medicare & Medicaid Services (CMS). Retrieved Aug 11, 2026.CMS's quarterly release of HCPCS Level II codes and short/long descriptors, the source for HCPCS code definitions and update history.
3.ICD-10-CM Full Code List. Centers for Medicare & Medicaid Services (CMS). Retrieved Aug 11, 2026.CMS's complete ICD-10-CM diagnosis code list, used to cross-reference diagnosis codes associated with this procedure or service.

Published by

Trek Health powers OpenPayer with a leading commercial payer intelligence platform, seamlessly converting fragmented payer data into actionable insights for provider organizations.

ICD-10-CM Code For Polyhydramnios: Group Overview

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ICD-10-CM O40: Polyhydramnios Overview

ICD-10-CM Code For Polyhydramnios: Group Overview

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ICD-10-CM O40: Polyhydramnios Overview

When to Use

ICD-10-CM Codes

DRG Codes

Typical Clinical Scenarios

Related Codes

Which ICD-10-CM code group covers polyhydramnios?

How are timing and fetus number represented in the `O40` codes?

What clinical documentation does accurate coding in group `O40` support?

Which DRGs may be associated with diagnoses from the `O40` group?

Do the `O40` codes indicate severity of polyhydramnios?

References

When to Use

ICD-10-CM Codes

DRG Codes

Typical Clinical Scenarios

Related Codes

Which ICD-10-CM code group covers polyhydramnios?

How are timing and fetus number represented in the `O40` codes?

What clinical documentation does accurate coding in group `O40` support?

Which DRGs may be associated with diagnoses from the `O40` group?

Do the `O40` codes indicate severity of polyhydramnios?

References