2027 ICD-10-CM Diagnosis Code O90.3Peripartum cardiomyopathy

ICD-10-CM Codes›O00-O9A›O85-O92›O90

ICD-10-CM O90.3
CMSSource: CMS FY 2027 ICD-10-CM dataset · Effective Oct 1, 2026 – Sep 30, 2027

O90.3 is a billable ICD-10-CM diagnosis code for peripartum cardiomyopathy. It is valid on HIPAA claims for fiscal year 2027 (October 1, 2026 through September 30, 2027) and groups to MS-DRG 769, 776. As a secondary diagnosis, it counts as a major complication or comorbidity (MCC) and places an inpatient stay in the highest severity level of its MS-DRG family. It does not count, however, when the principal diagnosis is one of 227 closely related codes. The code is restricted by the Medicare Code Editor to maternity cases (age 9 through 64). Coders also document this condition as dilated peripartum cardiomyopathy. In AHRQ's Clinical Classifications Software (CCSR), this diagnosis falls under Myocarditis and cardiomyopathy and Other specified complications in pregnancy.

Code Identity

ICD-10-CM Code
O90.3
Billable Status
Yes — Valid for Submission
Code Describes
Peripartum cardiomyopathy
Short Description
Peripartum cardiomyopathy
Same as the full description in the CMS dataset.
Parent Code
O90
Complications of the puerperium, not elsewhere classified

Code Classification

ChapterO00-O9APregnancy, childbirth and the puerperium
SectionO85-O92Complications predominantly related to the puerperium
CategoryO90Complications of the puerperium, not elsewhere classified
This CodeO90.3Peripartum cardiomyopathy

Code EditsBilling

Medicare Code Editor checks that affect claim validity for O90.3.

Maternity diagnoses
The Medicare Code Editor detects inconsistencies in maternity cases by checking a patient's age and any diagnosis on the patient's record. The maternity code edits apply to patients age ange is 9–64 years inclusive (e.g., diabetes in pregnancy, antepartum pulmonary complication).

Approximate SynonymsGuidance

Alternate terms and clinical phrases that map to this code.

  • Dilated peripartum cardiomyopathy
  • Heart disease in mother complicating pregnancy, childbirth AND/OR puerperium
  • Postpartum cardiomyopathy

Instructional NotesGuidance

Instructions from the official ICD-10-CM Tabular List that apply to O90.3: its own notes plus those printed at block O85-O92 and Chapter 15. A note printed at a category, block or chapter applies to every code under it.

Applicable To

Conditions this code is used for: synonyms of the title or, for "other specified" codes, the conditions assigned to it. The list is not exhaustive.

  • Conditions in I42.- arising during pregnancy and the puerperium

Excludes1

Not coded here: the excluded code is never reported together with this one, unless the two conditions are unrelated.

On O90.3 itself
  • pre-existing heart disease complicating pregnancy and the puerperium (O99.4-)
From Chapter 15 (O00-O9A) Pregnancy, childbirth and the puerperium applies to 2,481 codes
  • supervision of normal pregnancy (Z34.-)

Excludes2

Not included here: the excluded condition is not part of this code, but a patient may have both, so both codes may be reported.

From Block O85-O92 Complications predominantly related to the puerperium applies to 114 codes
  • mental and behavioral disorders associated with the puerperium (F53.-)
  • obstetrical tetanus (A34)
  • puerperal osteomalacia (M83.0)
From Chapter 15 (O00-O9A) Pregnancy, childbirth and the puerperium applies to 2,481 codes
  • mental and behavioral disorders associated with the puerperium (F53.-)
  • obstetrical tetanus (A34)
  • postpartum necrosis of pituitary gland (E23.0)
  • puerperal osteomalacia (M83.0)

Use Additional Code

Add a second code, after this one, to fully describe the condition.

From Chapter 15 (O00-O9A) Pregnancy, childbirth and the puerperium applies to 2,481 codes
  • code, if applicable, from category Z3A, Weeks of gestation, to identify the specific week of the pregnancy, if known.

Notes

General instructions on how these codes are used.

From Chapter 15 (O00-O9A) Pregnancy, childbirth and the puerperium applies to 2,481 codes
  • CODES FROM THIS CHAPTER ARE FOR USE ONLY ON MATERNAL RECORDS, NEVER ON NEWBORN RECORDS
  • Codes from this chapter are for use for conditions related to or aggravated by the pregnancy, childbirth, or by the puerperium (maternal causes or obstetric causes)
  • Trimesters are counted from the first day of the last menstrual period. They are defined as follows:
  • 1st trimester- less than 14 weeks 0 days
  • 2nd trimester- 14 weeks 0 days to less than 28 weeks 0 days
  • 3rd trimester- 28 weeks 0 days until delivery

Source: CMS ICD-10-CM Tabular List. How to read instructional notes.

Referenced in Other NotesGuidance

Instructional notes printed at other codes that name O90.3, its category, or a range that includes it.

Excludes1 1

These codes carry an Excludes1 note naming O90.3: they are not reported together with it, unless the two conditions are unrelated.

  • O99.4 Diseases of the circulatory system complicating pregnancy, childbirth and the puerperium
    peripartum cardiomyopathy (O90.3)

Excludes2 1

These codes carry an Excludes2 note naming O90.3: its condition is not part of those codes, and both may be reported when the patient has both.

  • I42 Cardiomyopathy
    peripartum cardiomyopathy (O90.3)

Index to Diseases and InjuriesGuidance

Alphabetical index entries that point to this code.

Clinical ClassificationClinical

AHRQ’s CCSR groups this code into broader clinical categories.

CCSR CIR005
Myocarditis and cardiomyopathy
Default principal diagnosis: inpatient No · outpatient No
CCSR PRG028
Other specified complications in pregnancy
Default principal diagnosis: inpatient Yes · outpatient Yes

Clinical InformationClinical

  • Peripartum Cardiomyopathy

    a rare form of dilated cardiomyopathy which causes heart enlargement and weakness during the last month of pregnancy or within five months of delivery.

Patient EducationClinical

Cardiomyopathy

Cardiomyopathy is the name for diseases of the heart muscle. These diseases enlarge your heart muscle or make it thicker and more rigid than normal. In rare cases, scar tissue replaces the muscle tissue.

Read the full article at MedlinePlus

Courtesy of MedlinePlus, a service of the U.S. National Library of Medicine.

Convert O90.3 to ICD-9-CMHistory

The closest ICD-9-CM equivalents under the General Equivalence Mappings.

ICD-9-CM
674.52 Peripart card del w p/p
Approximate The match is approximate rather than exact.
ICD-9-CM
674.54 Peripartum card-postpart
Approximate The match is approximate rather than exact.

Code HistoryHistory

FY 2016AddedAdded to the ICD-10-CM code setEffective October 1, 2015, the first year of ICD-10-CM.
FY 2017–2026No changes
FY 2027CurrentCurrent code set, no changesEffective October 1, 2026 through September 30, 2027.

Questions About O90.3Overview

What is the ICD-10 code for peripartum cardiomyopathy?

The ICD-10-CM code for peripartum cardiomyopathy is O90.3 (sometimes written as O903). It is billable on HIPAA-covered claims from October 1, 2026 through September 30, 2027.

Is O90.3 (Complications of the puerperium, not elsewhere classified) a billable code?

Yes. This is a billable ICD-10-CM code, specific enough to report peripartum cardiomyopathy on HIPAA-covered claims from October 1, 2026 through September 30, 2027.

What MS-DRG does O90.3 group to?

When peripartum cardiomyopathy is the principal diagnosis on an inpatient stay, it groups to MS-DRG 769, 776, with relative weights from 0.6718 to 1.6666 depending on complications. Higher weights mean higher Medicare reimbursement.

Is O90.3 a CC or MCC?

CMS lists O90.3 as an MCC (major complication or comorbidity) for FY 2027. Reported as a secondary diagnosis, it places the inpatient stay in the highest-weighted DRG of its severity family. It does not count when the principal diagnosis is one of the 227 closely related codes in its exclusion list.

Who can O90.3 be reported for?

The Medicare Code Editor checks peripartum cardiomyopathy against patient demographics: this code is intended for maternity cases (age 9 through 64). Claims outside these limits are flagged as inconsistent.