Polyhydramnios
In Maternal care related to the fetus and amniotic cavity and possible delivery problems (O30-O48), chapter 15: Pregnancy, Childbirth and the Puerperium
28 billable codes under O40: none are a CC or MCC; none map to an HCC.
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Instructional notes
Includes: conditions that are coded here
- hydramnios
Excludes1: not coded here, use a different code
- encounter for suspected maternal and fetal conditions ruled out (Z03.7-)
Official coding guidelines
From the ICD-10-CM Official Guidelines for Coding and Reporting, FY 2027 (CMS and NCHS). Links open the PDF at the right page.
Coding of obstetric cases with O00-O9A codes: sequencing priority, trimester and fetus characters, principal diagnosis selection, delivery outcome, and pregnancy-related complications.
- General Rules for Obstetric Cases (page 63)
- Selection of OB Principal or First-listed Diagnosis (page 64)
- Pre-existing conditions versus conditions due to the pregnancy (page 65)
- Pre-existing hypertension in pregnancy (page 66)
- Fetal Conditions Affecting the Management of the Mother (page 66)
- HIV Infection in Pregnancy, Childbirth and the Puerperium (page 66)
- Diabetes mellitus in pregnancy (page 66)
- Long term use of insulin and oral hypoglycemics (page 67)
All codes under O40
O40 can't be used on a claim. Pick a billable code below; grey headings group them.
- O40.1Polyhydramnios, first trimester
- O40.1XX0Polyhydramnios, first trimester, not applicable or unspecified
- O40.1XX1Polyhydramnios, first trimester, fetus 1
- O40.1XX2Polyhydramnios, first trimester, fetus 2
- O40.1XX3Polyhydramnios, first trimester, fetus 3
- O40.1XX4Polyhydramnios, first trimester, fetus 4
- O40.1XX5Polyhydramnios, first trimester, fetus 5
- O40.1XX9Polyhydramnios, first trimester, other fetus
- O40.2Polyhydramnios, second trimester
- O40.2XX0Polyhydramnios, second trimester, not applicable or unspecified
- O40.2XX1Polyhydramnios, second trimester, fetus 1
- O40.2XX2Polyhydramnios, second trimester, fetus 2
- O40.2XX3Polyhydramnios, second trimester, fetus 3
- O40.2XX4Polyhydramnios, second trimester, fetus 4
- O40.2XX5Polyhydramnios, second trimester, fetus 5
- O40.2XX9Polyhydramnios, second trimester, other fetus
- O40.3Polyhydramnios, third trimester
- O40.3XX0Polyhydramnios, third trimester, not applicable or unspecified
- O40.3XX1Polyhydramnios, third trimester, fetus 1
- O40.3XX2Polyhydramnios, third trimester, fetus 2
- O40.3XX3Polyhydramnios, third trimester, fetus 3
- O40.3XX4Polyhydramnios, third trimester, fetus 4
- O40.3XX5Polyhydramnios, third trimester, fetus 5
- O40.3XX9Polyhydramnios, third trimester, other fetus
- O40.9Polyhydramnios, unspecified trimester
- O40.9XX0Polyhydramnios, unspecified trimester, not applicable or unspecified
- O40.9XX1Polyhydramnios, unspecified trimester, fetus 1
- O40.9XX2Polyhydramnios, unspecified trimester, fetus 2
- O40.9XX3Polyhydramnios, unspecified trimester, fetus 3
- O40.9XX4Polyhydramnios, unspecified trimester, fetus 4
- O40.9XX5Polyhydramnios, unspecified trimester, fetus 5
- O40.9XX9Polyhydramnios, unspecified trimester, other fetus
O40 MS-DRGs
As the principal diagnosis, all 28 billable codes under O40 group to MS-DRG 817, 818, 819, 831, 832, or 833 (v44.0). Which one applies depends on procedures performed, secondary diagnoses (CC/MCC), and the patient's age and discharge status.
- DRG 817 Other Antepartum Diagnoses with O.R. Procedures with MCC
- DRG 818 Other Antepartum Diagnoses with O.R. Procedures with CC
- DRG 819 Other Antepartum Diagnoses with O.R. Procedures without CC/MCC
- DRG 831 Other Antepartum Diagnoses without O.R. Procedures with MCC
- DRG 832 Other Antepartum Diagnoses without O.R. Procedures with CC
- DRG 833 Other Antepartum Diagnoses without O.R. Procedures without CC/MCC
Other codes that refer to O40
Notes on these codes point to O40.
- Z03.7 Excludes1: known or suspected fetal anomalies affecting management of mother, not ruled out (O26.-, O35.-, O36.-, O40.-, O41.-)
About the condition
Plain-language background from MedlinePlus (National Library of Medicine), not coding guidance.
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.
Read more about health problems in pregnancy on MedlinePlusCode history
Valid since FY2016, when ICD-10-CM took effect on October 1, 2015. No changes since.