Skip to main content
ICD-10/O40.3XX0

O40.3XX0 ICD-10-CM Code: Polyhydramnios, third trimester, not applicable or unspecified

Billing Status: YES. This is a valid, specific, and billable ICD-10-CM reference.

Inpatient Payment Groups (MS-DRG)

MS-DRGs this diagnosis helps define, as principal or secondary, per the CMS ICD-10-CM/PCS MS-DRG Definitions Manual v43.0 (FY2026), Appendix B.

  • MS-DRG 817 — OTHER ANTEPARTUM DIAGNOSES WITH O.R. PROCEDURES WITH MCC (MDC 14)
  • MS-DRG 818 — OTHER ANTEPARTUM DIAGNOSES WITH O.R. PROCEDURES WITH CC (MDC 14)
  • MS-DRG 819 — OTHER ANTEPARTUM DIAGNOSES WITH O.R. PROCEDURES WITHOUT CC/MCC (MDC 14)
  • MS-DRG 831 — OTHER ANTEPARTUM DIAGNOSES WITHOUT O.R. PROCEDURES WITH MCC (MDC 14)
  • MS-DRG 832 — OTHER ANTEPARTUM DIAGNOSES WITHOUT O.R. PROCEDURES WITH CC (MDC 14)
  • MS-DRG 833 — OTHER ANTEPARTUM DIAGNOSES WITHOUT O.R. PROCEDURES WITHOUT CC/MCC (MDC 14)

A diagnosis appearing in a group's logic does not by itself determine the DRG assigned to a stay; the grouper uses the full claim.

Code Set: Valid FY2026 and FY2027. FY2026 took effect October 1, 2025.

Official Registry Overview & Definition

Polyhydramnios, third trimester, not applicable or unspecified is a billable ICD-10-CM diagnosis code (O40.30).

Official Tabular Instructional Notes

Sequencing, inclusion, and exclusion notes published for O40.3XX0 in the official ICD-10-CM tabular list.

Includes

Conditions the official ICD-10-CM tabular list includes under this code.

  • hydramnios

Excludes1 — Not Coded Here

Conditions that can never be reported with this code; the two are mutually exclusive.

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

Frequently Asked Questions (FAQ) & Clinical Guidance

Does O40.3XX0 require a 7th character?

Yes. 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..

Nearest Codes in This Family

Official ICD-10-CM classifications closest to O40.3XX0 in its code family, with their registry titles.

  • 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
  • O40.3 — Polyhydramnios, third trimester
  • 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

View all codes in the O40 family