Skip to content
Dx

ICD-10-CM 2027 diagnosis code

O46.90Antepartum hemorrhage, unspecified, unspecified trimester

✓ Billable / specificMaternity · age 9–64Female only

O46.90 is a valid, billable ICD-10-CM code for antepartum hemorrhage, unspecified, unspecified trimester. It can be reported on claims for dates of service from October 1, 2026 – September 30, 2027.

Looking up by condition? See ICD-10 code for Antepartum with hemorrhage.

Code unchanged since ICD-10-CM took effect on October 1, 2015. Source: official FY2027 ICD-10-CM release from CDC/NCHS and CMS. Page updated September 29, 2026. About our data

About O46.90

O46.90 is the ICD-10-CM diagnosis code for antepartum hemorrhage, unspecified, unspecified trimester. It belongs to category O46 (antepartum hemorrhage, not elsewhere classified), block O30-O48 (maternal care related to the fetus and amniotic cavity and possible delivery problems) and chapter 15 (pregnancy, childbirth and the puerperium). It is billable, so it can be reported on its own for dates of service from October 1, 2026 through September 30, 2027.

Within O46.9, choose O46.90 (unspecified trimester) only when documentation doesn't support a more specific option: first trimester (O46.91), second trimester (O46.92) and third trimester (O46.93).

It is not a CC or MCC, so as a secondary diagnosis it doesn't change the MS-DRG severity level.

In MS-DRG v44.0, it is part of the grouping logic for DRG 817 (Other Antepartum Diagnoses with O.R. Procedures with MCC, relative weight 2.0534), DRG 818 (Other Antepartum Diagnoses with O.R. Procedures with CC, relative weight 1.2942), DRG 819 (Other Antepartum Diagnoses with O.R. Procedures without CC/MCC, relative weight 0.7739), DRG 831 (Other Antepartum Diagnoses without O.R. Procedures with MCC, relative weight 1.1558), DRG 832 (Other Antepartum Diagnoses without O.R. Procedures with CC, relative weight 0.7585) and DRG 833 (Other Antepartum Diagnoses without O.R. Procedures without CC/MCC, relative weight 0.5002), in MDC 14 (Pregnancy, Childbirth and the Puerperium), as a principal or secondary diagnosis. The DRG a claim lands in depends on the principal diagnosis, procedures and any CC/MCC secondary diagnoses.

The Medicare Code Editor treats this as a maternity diagnosis, expected only for patients age 9 through 64.

It is on the CMS list of diagnoses consistent only with female patients (the sex-conflict edit itself was retired in FY2025).

It has been part of ICD-10-CM since the code set took effect on October 1, 2015 and hasn't changed since.

Before ICD-10, this condition was coded in ICD-9-CM as 641.90 (unspecified antepartum hemorrhage, unspecified as to episode of care or not applicable).

Notes that apply from higher levels

Instructions written at a parent level also apply to O46.90.

› From O46 Antepartum hemorrhage, not elsewhere classified
Excludes1
  • hemorrhage in early pregnancy (O20.-)
  • intrapartum hemorrhage NEC (O67.-)
  • placenta previa (O44.-)
  • premature separation of placenta [abruptio placentae] (O45.-)

Broader instructions also apply from Chapter 15: Pregnancy, childbirth and the puerperium.

Alphabetic index entries

1 entries

Terms in the official ICD-10-CM index that lead to O46.90.

MS-DRG v44.0 grouping

All DRGs →

Inpatient MS-DRGs this diagnosis can group to, as the principal or a secondary diagnosis, depending on the rest of the claim.

ICD-9-CM equivalent

Converter →
  • 641.90Unspecified antepartum hemorrhage, unspecified as to episode of care or not applicableapproximate

From the CMS 2018 General Equivalence Mappings (GEMs), the final GEMs release.

Code history

  1. 2016
  2. 2017
  3. 2018
  4. 2019
  5. 2020
  6. 2021
  7. 2022
  8. 2023
  9. 2024
  10. 2025
  11. 2026
  12. 2027
  • FY2016 (effective 10/1/2015): Added (first year of ICD-10-CM)
  • No changes since FY2016.

Common questions about O46.90

Is O46.90 billable?

Yes. O46.90 is a billable/specific ICD-10-CM code valid for FY2027 (October 1, 2026 – September 30, 2027).

Can O46.90 be used as a principal diagnosis?

Yes. The Medicare Code Editor doesn't restrict O46.90 as a principal diagnosis.

Is O46.90 a CC or MCC?

No. O46.90 is neither a CC nor an MCC under MS-DRG v44.0.

What DRG does O46.90 group to?

O46.90 is used in the MS-DRG v44.0 logic for MS-DRG 817 (Other Antepartum Diagnoses with O.R. Procedures with MCC), MS-DRG 818 (Other Antepartum Diagnoses with O.R. Procedures with CC), MS-DRG 819 (Other Antepartum Diagnoses with O.R. Procedures without CC/MCC), MS-DRG 831 (Other Antepartum Diagnoses without O.R. Procedures with MCC), MS-DRG 832 (Other Antepartum Diagnoses without O.R. Procedures with CC) and MS-DRG 833 (Other Antepartum Diagnoses without O.R. Procedures without CC/MCC). Which one applies depends on whether it is the principal diagnosis and on the rest of the claim.

What is the ICD-9 code for O46.90?

The CMS General Equivalence Mappings map O46.90 to ICD-9-CM 641.90.