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ICD-10/O09.A3

O09.A3 ICD-10-CM Code: Supervision of pregnancy with history of molar pregnancy, third trimester

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 998 — PRINCIPAL DIAGNOSIS INVALID AS DISCHARGE DIAGNOSIS (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

Supervision of pregnancy with history of molar pregnancy, third trimester is a billable ICD-10-CM diagnosis code (O09.A3).

Change history

  • FY2017 — 2016-10-01
    Added to the code set
    Supervision of pregnancy with history of molar pregnancy, third trimester
    FY2017 changes

Verify Before Coding

  • Principal-diagnosis restriction. The Medicare Code Editor lists this code as unacceptable as a principal diagnosis: it describes a circumstance influencing health status rather than a current illness or injury being treated. It is valid as a secondary diagnosis.
  • 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 O09.A3 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]
  • O09-O09 — Supervision of high risk pregnancy [Hierarchy]

Referenced by Excludes1 notes

  • Z34 — Encounter for supervision of normal pregnancy [Excludes1](via O09.-): “encounter for supervision of high risk pregnancy (O09.-)” · check together

Referenced by Code First instructions

  • Z3A — Weeks of gestation [Code First](via O09.-): “obstetric condition or encounter for delivery (O09-O60, O80-O82, O94-O9A)” · check together

Clinical classification (CCSR)

  • PRG008 — Supervision of high-risk pregnancy [CCSR]

Potential MS-DRG

  • DRG 998 — PRINCIPAL DIAGNOSIS INVALID AS DISCHARGE DIAGNOSIS [MS-DRG]: “PRINCIPAL DIAGNOSIS INVALID AS DISCHARGE DIAGNOSIS (MDC 14)”

Nearest codes (40)

  • O09 — Supervision of high risk pregnancy [Sibling]
  • O09.61 — Supervision of young primigravida [Sibling]
  • O09.611 — Supervision of young primigravida, first trimester [Sibling]
  • O09.612 — Supervision of young primigravida, second trimester [Sibling]
  • O09.613 — Supervision of young primigravida, third trimester [Sibling]
  • O09.619 — Supervision of young primigravida, unspecified trimester [Sibling]
  • O09.62 — Supervision of young multigravida [Sibling]
  • O09.621 — Supervision of young multigravida, first trimester [Sibling]
  • and 32 more

Change history

  • FY2017 — Added to the code set [Change history]

Referenced by Other Codes

Clinical classification (AHRQ CCSR):PRG008 — Supervision of high-risk pregnancy (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 1 MS-DRG: DRG 998 (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 O09.A3 or its code family.

1 Excludes1 notes: Z34 (via O09.-).

1 Code First instructions: Z3A (via O09.-).

Nearest Codes in This Family

Official ICD-10-CM classifications closest to O09.A3 in its code family, with their registry titles.

  • O09.893 — Supervision of other high risk pregnancies, third trimester
  • O09.899 — Supervision of other high risk pregnancies, unspecified trimester
  • O09.9 — Supervision of high risk pregnancy, unspecified
  • O09.90 — Supervision of high risk pregnancy, unspecified, unspecified trimester
  • O09.91 — Supervision of high risk pregnancy, unspecified, first trimester
  • O09.92 — Supervision of high risk pregnancy, unspecified, second trimester
  • O09.93 — Supervision of high risk pregnancy, unspecified, third trimester
  • O09.A — Supervision of pregnancy with history of molar pregnancy
  • O09.A0 — Supervision of pregnancy with history of molar pregnancy, unspecified trimester
  • O09.A1 — Supervision of pregnancy with history of molar pregnancy, first trimester

View all codes in the O09 family