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O40 ICD-10-CM Code: Polyhydramnios

Billing Status: NO. This is a clinician non-billable / parent hierarchy grouping in the ICD-10-CM system.

Official Registry Overview & Definition

Polyhydramnios is a non-billable ICD-10-CM category code (O40). A more specific billable subcode must be selected for claims submission.

Official Tabular Instructional Notes

Sequencing, inclusion, and exclusion notes published for O40 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 generally not reported together with this code (Excludes1) -- an error unless the two conditions are documented as unrelated to each other (ICD-10-CM Official Guidelines, Section I.A.12.a).

Frequently Compared Codes

The official Excludes notes on O40 name these codes. Each comparison page covers when the two can — or must not — be reported together.

Change history

No changes recorded for this code — unchanged since the FY2016 baseline of the change ledger.

Verify Before Coding

  • Not billable as written — a more specific code is required: O40.1XX0, O40.1XX1, O40.1XX2, O40.1XX3, O40.1XX4.
  • Requires a 7th 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." Options: O40.1XX0, O40.1XX1, O40.1XX2, O40.1XX3, O40.1XX4, O40.1XX5

From the code registry, the Medicare Code Editor, and the MS-DRG Definitions Manual. Check it against a full claim.

Contextual Map

Every relationship of O40 in one view: hierarchy, official tabular instructions in both directions, clinical classification, risk adjustment, MS-DRG participation, index terms and change history — each edge carrying the CMS source it derives from.

Hierarchy

  • O00-O9A — Chapter 15: Pregnancy, Childbirth and the Puerperium (O00-O9A) (O00-O9A) [Hierarchy]
  • O30-O48 — Maternal care related to the fetus and amniotic cavity and possible delivery problems [Hierarchy]

Excludes1

  • Z03.7 — Encounter for suspected maternal and fetal conditions ruled out [Excludes1]: “encounter for suspected maternal and fetal conditions ruled out (Z03.7-)” · check together

Referenced by Excludes1 notes

  • Z03.7 — Encounter for suspected maternal and fetal conditions ruled out [Excludes1]: “known or suspected fetal anomalies affecting management of mother, not ruled out (O26.-, O35.-, O36.-, O40.-, O41.-)” · check together

Nearest codes (32)

  • O40.1 — Polyhydramnios, first trimester [Sibling]
  • O40.1XX0 — Polyhydramnios, first trimester, not applicable or unspecified [Sibling]
  • O40.1XX1 — Polyhydramnios, first trimester, fetus 1 [Sibling]
  • O40.1XX2 — Polyhydramnios, first trimester, fetus 2 [Sibling]
  • O40.1XX3 — Polyhydramnios, first trimester, fetus 3 [Sibling]
  • O40.1XX4 — Polyhydramnios, first trimester, fetus 4 [Sibling]
  • O40.1XX5 — Polyhydramnios, first trimester, fetus 5 [Sibling]
  • O40.1XX9 — Polyhydramnios, first trimester, other fetus [Sibling]
  • and 24 more

Referenced by Other Codes

Official ICD-10-CM tabular notes on other codes that name O40 or its code family.

1 Excludes1 notes: Z03.7.

Frequently Asked Questions (FAQ) & Clinical Guidance

Can O40 be billed directly?

No. O40 (Polyhydramnios) is a non-billable ICD-10-CM category code. A more specific billable subcode must be selected based on clinical documentation.

Does O40 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.; 0: not applicable or unspecified; 1: fetus 1; 2: fetus 2; 3: fetus 3; 4: fetus 4; 5: fetus 5; 9: other fetus.

Nearest Codes in This Family

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

  • O40.1 — Polyhydramnios, first trimester
  • 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
  • O40.2 — Polyhydramnios, second trimester
  • 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
  • O40.3 — Polyhydramnios, third trimester
  • 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
  • O40.3XX9 — Polyhydramnios, third trimester, other fetus
  • O40.9 — Polyhydramnios, unspecified trimester
  • O40.9XX0 — Polyhydramnios, unspecified trimester, not applicable or unspecified
  • O40.9XX1 — Polyhydramnios, unspecified trimester, fetus 1
  • O40.9XX2 — Polyhydramnios, unspecified trimester, fetus 2
  • O40.9XX3 — Polyhydramnios, unspecified trimester, fetus 3
  • O40.9XX4 — Polyhydramnios, unspecified trimester, fetus 4
  • O40.9XX5 — Polyhydramnios, unspecified trimester, fetus 5
  • O40.9XX9 — Polyhydramnios, unspecified trimester, other fetus