2026 ICD-10-CM Diagnosis Code O99.43Diseases of the circulatory system complicating the puerperium

ICD-10-CM Codes›O00-O9A›O94-O9A›O99

ICD-10-CM O99.43
CMSSource: CMS FY 2026 ICD-10-CM dataset · Effective Oct 1, 2025 – Sep 30, 2026

O99.43 is a billable ICD-10-CM diagnosis code for diseases of the circulatory system complicating the puerperium. It is valid on HIPAA claims for fiscal year 2026 (October 1, 2025 through September 30, 2026). The code is restricted by the Medicare Code Editor to maternity cases (age 9 through 64). Coders also document this condition as cerebrovascular disorder in the puerperium. In AHRQ's Clinical Classifications Software (CCSR), this diagnosis falls under Complications specified during the puerperium.

Code Identity

ICD-10-CM Code
O99.43
Billable Status
Yes — Valid for Submission
Code Describes
Diseases of the circulatory system complicating the puerperium
Short Description
Diseases of the circ sys complicating the puerperium
Parent Code
O99.4
Diseases of the circulatory system complicating pregnancy, childbirth and the puerperium

Code Classification

ChapterO00-O9APregnancy, childbirth and the puerperium
SectionO94-O9AOther obstetric conditions, not elsewhere classified
CategoryO99Other maternal diseases classifiable elsewhere but complicating pregnancy, childbirth and the puerperium
This CodeO99.43Diseases of the circulatory system complicating the puerperium

Code EditsBilling

Medicare Code Editor checks that affect claim validity for O99.43.

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.

  • Cerebrovascular disorder in the puerperium
  • Heart disease in mother complicating pregnancy, childbirth AND/OR puerperium
  • Postpartum heart murmur
  • Stroke in the puerperium

Index to Diseases and InjuriesGuidance

Alphabetical index entries that point to this code.

External Cause of Injuries IndexGuidance

References for this code in the External Cause of Injuries Index.

    • Puerperal, puerperium(complicated by, complications)
      • apoplexy
    • Puerperal, puerperium(complicated by, complications)
      • cerebrovascular disorder (conditions in I60-I69)
    • Puerperal, puerperium(complicated by, complications)
      • circulatory system disorder
    • Puerperal, puerperium(complicated by, complications)
      • disease
        • cerebrovascular (acute)
    • Puerperal, puerperium(complicated by, complications)
      • hematoma, subdural
    • Puerperal, puerperium(complicated by, complications)
      • hemiplegia, cerebral
        • due to cerebrovascular disorder
    • Puerperal, puerperium(complicated by, complications)
      • hemorrhage
        • brain
    • Puerperal, puerperium(complicated by, complications)
      • hemorrhage
        • bulbar
    • Puerperal, puerperium(complicated by, complications)
      • hemorrhage
        • cerebellar
    • Puerperal, puerperium(complicated by, complications)
      • hemorrhage
        • cerebral
    • Puerperal, puerperium(complicated by, complications)
      • hemorrhage
        • cortical
    • Puerperal, puerperium(complicated by, complications)
      • hemorrhage
        • extradural
    • Puerperal, puerperium(complicated by, complications)
      • hemorrhage
        • internal capsule
    • Puerperal, puerperium(complicated by, complications)
      • hemorrhage
        • intracranial
    • Puerperal, puerperium(complicated by, complications)
      • hemorrhage
        • intrapontine
    • Puerperal, puerperium(complicated by, complications)
      • hemorrhage
        • meningeal
    • Puerperal, puerperium(complicated by, complications)
      • hemorrhage
        • pontine
    • Puerperal, puerperium(complicated by, complications)
      • hemorrhage
        • subarachnoid
    • Puerperal, puerperium(complicated by, complications)
      • hemorrhage
        • subcortical
    • Puerperal, puerperium(complicated by, complications)
      • hemorrhage
        • subdural
    • Puerperal, puerperium(complicated by, complications)
      • hemorrhage
        • ventricular
    • Puerperal, puerperium(complicated by, complications)
      • ischemia, cerebral
    • Puerperal, puerperium(complicated by, complications)
      • monoplegia, cerebral
    • Puerperal, puerperium(complicated by, complications)
      • occlusion, precerebral artery
    • Puerperal, puerperium(complicated by, complications)
      • paralysis
        • cerebral
    • Puerperal, puerperium(complicated by, complications)
      • paralytic stroke
    • Puerperal, puerperium(complicated by, complications)
      • stroke
    • Thrombosis, thrombotic(bland) (multiple) (progressive) (silent) (vessel)
      • brain (artery) (stem)
        • puerperal
    • Thrombosis, thrombotic(bland) (multiple) (progressive) (silent) (vessel)
      • puerperal, postpartum
        • brain (artery)
    • Thrombosis, thrombotic(bland) (multiple) (progressive) (silent) (vessel)
      • puerperal, postpartum
        • cardiac
    • Thrombosis, thrombotic(bland) (multiple) (progressive) (silent) (vessel)
      • puerperal, postpartum
        • cerebral (artery)

Clinical ClassificationClinical

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

CCSR PRG027
Complications specified during the puerperium
Default principal diagnosis: inpatient Yes · outpatient Yes

Patient EducationClinical

Heart Diseases

Heart disease is a general term that includes many types of heart problems. It's a type of cardiovascular disease, which means heart and blood vessel disease.

The full article covers:

  • What is heart disease?
  • What are the types of heart disease?
  • What causes heart diseases?
  • Who is more likely to develop heart diseases?
  • What are the symptoms of heart disease?
  • How are heart diseases diagnosed?
  • What are the treatments for heart disease?
  • Can heart diseases be prevented?

Read the full article at MedlinePlus

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

Convert O99.43 to ICD-9-CMHistory

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

ICD-9-CM
674.04 Cerebrovasc dis-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 2017–2025No changes
FY 2026CurrentCurrent code set, no changesEffective October 1, 2025 through September 30, 2026.

Questions About O99.43Overview

Is O99.43 a billable code?

Yes. This is a billable ICD-10-CM code, specific enough to report diseases of the circulatory system complicating the puerperium on HIPAA-covered claims from October 1, 2025 through September 30, 2026.

Who can O99.43 be reported for?

The Medicare Code Editor checks diseases of the circulatory system complicating the puerperium against patient demographics: this code is intended for maternity cases (age 9 through 64). Claims outside these limits are flagged as inconsistent.

What is the ICD-9 equivalent of O99.43?

Under the General Equivalence Mappings, diseases of the circulatory system complicating the puerperium converts to ICD-9-CM 674.04 (cerebrovasc dis-postpart). The mapping is approximate, so confirm the match fits the documentation.

Footnotes

[1] Not chronic - A diagnosis code that does not fit the criteria for chronic condition (duration, ongoing medical treatment, and limitations) is considered not chronic. Some codes designated as not chronic are acute conditions. Other diagnosis codes that indicate a possible chronic condition, but for which the duration of the illness is not specified in the code description (i.e., we do not know the condition has lasted 12 months or longer) also are considered not chronic.