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O36.23X2 ICD-10-CM Code: Maternal care for hydrops fetalis, third trimester, fetus 2

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, 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.

Official Registry Overview & Definition

Maternal care for hydrops fetalis, third trimester, fetus 2 is a billable ICD-10-CM diagnosis code (O36.232).

Official Tabular Instructional Notes

Sequencing, inclusion, and exclusion notes published for O36.23X2 in the official ICD-10-CM tabular list.

Includes

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

  • the listed conditions in the fetus as a reason for hospitalization or other obstetric care of the mother, or for termination of pregnancy

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).

Excludes2 — Not Included Here

Conditions not covered by this code, but which may be reported alongside it when both are present.

Frequently Compared Codes

The official Excludes notes on O36.23X2 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

  • Age-restricted: the Medicare Code Editor lists this as a maternity (age 9-64) diagnosis; other ages are presumed incorrect.

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 O36.23X2 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]
  • O36 — Clinical Diagnosis [Hierarchy]
  • O36.2 — Clinical Diagnosis [Hierarchy]
  • O36.23 — Clinical Diagnosis [Hierarchy]
  • O36.23X — Clinical Diagnosis [Hierarchy]

Referenced by Excludes1 notes

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

Clinical classification (CCSR)

  • PRG013 — Maternal care related to fetal conditions [CCSR]

Potential MS-DRG

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

MDC crossing · procedures (94)

  • MDC 14 — Pregnancy, Childbirth and the Puerperium [MDC crossing]: “Pregnancy, Childbirth and the Puerperium — the grouper's crossing between diagnoses and procedures: a principal diagnosis sets the MDC, and same-MDC procedures move the stay to its surgical DRGs.”
  • 0U570ZZ — Destruction of Bilateral Fallopian Tubes, Open Approach [Same-MDC procedure]: “Destruction of Bilateral Fallopian Tubes, Open Approach — grouped in MDC 14, the procedure side of this code's crossing.” · check together
  • 0U573ZZ — Destruction of Bilateral Fallopian Tubes, Percutaneous Approach [Same-MDC procedure]: “Destruction of Bilateral Fallopian Tubes, Percutaneous Approach — grouped in MDC 14, the procedure side of this code's crossing.” · check together
  • 0U574ZZ — Destruction of Bilateral Fallopian Tubes, Percutaneous Endoscopic Approach [Same-MDC procedure]: “Destruction of Bilateral Fallopian Tubes, Percutaneous Endoscopic Approach — grouped in MDC 14, the procedure side of this code's crossing.” · check together
  • 0U577ZZ — Destruction of Bilateral Fallopian Tubes, Via Natural or Artificial Opening [Same-MDC procedure]: “Destruction of Bilateral Fallopian Tubes, Via Natural or Artificial Opening — grouped in MDC 14, the procedure side of this code's crossing.” · check together
  • 0U578ZZ — Destruction of Bilateral Fallopian Tubes, Via Natural or Artificial Opening Endoscopic [Same-MDC procedure]: “Destruction of Bilateral Fallopian Tubes, Via Natural or Artificial Opening Endoscopic — grouped in MDC 14, the procedure side of this code's crossing.” · check together
  • and 89 more

Nearest codes (40)

  • O36 — Maternal care for other fetal problems [Sibling]
  • O36.20X9 — Maternal care for hydrops fetalis, unspecified trimester, other fetus [Sibling]
  • O36.21 — Maternal care for hydrops fetalis, first trimester [Sibling]
  • O36.21X0 — Maternal care for hydrops fetalis, first trimester, not applicable or unspecified [Sibling]
  • O36.21X1 — Maternal care for hydrops fetalis, first trimester, fetus 1 [Sibling]
  • O36.21X2 — Maternal care for hydrops fetalis, first trimester, fetus 2 [Sibling]
  • O36.21X3 — Maternal care for hydrops fetalis, first trimester, fetus 3 [Sibling]
  • O36.21X4 — Maternal care for hydrops fetalis, first trimester, fetus 4 [Sibling]
  • and 32 more

Referenced by Other Codes

Clinical classification (AHRQ CCSR):PRG013 — Maternal care related to fetal conditions (default).

Clinical Classifications Software Refined (CCSR) for ICD-10-CM Diagnoses. Healthcare Cost and Utilization Project (HCUP), Agency for Healthcare Research and Quality.

Potential MS-DRG Relationships (FY2026)

Not on the CMS CC/MCC list — as a secondary diagnosis this code does not change MS-DRG severity.

Named in the grouper logic of 6 MS-DRGs: DRG 817 (MDC 14), DRG 818 (MDC 14), DRG 819 (MDC 14), DRG 831 (MDC 14), DRG 832 (MDC 14), DRG 833 (MDC 14).

From the CMS MS-DRG Definitions Manual (Appendices B and C). Actual DRG assignment depends on the complete claim.

Official ICD-10-CM tabular notes on other codes that name O36.23X2 or its code family.

1 Excludes1 notes: Z03.7 (via O36.-).

Frequently Asked Questions (FAQ) & Clinical Guidance

Does O36.23X2 require a 7th character?

Yes. One of the following 7th characters is to be assigned to each code under category O36. 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 O36 that has a 7th character of 1 through 9..

Nearest Codes in This Family

Official ICD-10-CM classifications closest to O36.23X2 in its code family, with their registry titles.

  • O36.22X5 — Maternal care for hydrops fetalis, second trimester, fetus 5
  • O36.22X9 — Maternal care for hydrops fetalis, second trimester, other fetus
  • O36.23 — Maternal care for hydrops fetalis, third trimester
  • O36.23X0 — Maternal care for hydrops fetalis, third trimester, not applicable or unspecified
  • O36.23X1 — Maternal care for hydrops fetalis, third trimester, fetus 1
  • O36.23X3 — Maternal care for hydrops fetalis, third trimester, fetus 3
  • O36.23X4 — Maternal care for hydrops fetalis, third trimester, fetus 4
  • O36.23X5 — Maternal care for hydrops fetalis, third trimester, fetus 5
  • O36.23X9 — Maternal care for hydrops fetalis, third trimester, other fetus
  • O36.4 — Maternal care for intrauterine death

View all codes in the O36 family