ICD10
ICD-10 Code O99.4: Diseases of the circulatory system complicating pregnancy, childbirth and the puerperium
Reviewed by HealthAssure Clinical TeamUpdated 26 May 2026
What is this code?
ICD-10 entries help standardize how diagnoses are organized for coding, reporting, analytics, and documentation. This code sits within the broader ICD-10 area for Pregnancy, childbirth and the puerperium (O00-O9A).
đź“‹Clinical overview
This ICD-10 overview page groups maternal circulatory-system complication codes under a broad parent code. The most accurate billable code usually depends on whether the record specifies pregnancy versus childbirth versus puerperium timing and whether the underlying cardiac or vascular diagnosis is named more specifically.
When is it used?
- May be used when a clinician documents diseases of the circulatory system complicating pregnancy, childbirth and the puerperium in a patient's medical record.
- May appear in hospital records, claims, referrals, and clinical documentation.
- This code may act more like a grouping or parent code, so a more specific child code may be used in final documentation when available.
What it does not mean
- A code alone does not explain severity, treatment plan, or outcome.
- A medical code should not be treated as a substitute for a doctor's diagnosis or advice.
- This entry may represent a broader category rather than the most specific billable code.
đź©şClinical context
When commonly used
- Parent-code browsing, coding review, and clinical-reference workflows where the goal is to understand the broader maternal circulatory complication family before selecting a timing-specific child code.
- Documentation review where the chart clearly links cardiovascular disease to obstetric care, but the user is navigating the broad umbrella page rather than a more specific child page.
Common workup
- Related procedures or service context already linked on this page include Obstetric ultrasound, Fetal nonstress testing.
Common management context
- Overview-level review often includes blood-pressure or cardiovascular assessment context, medication review, obstetric monitoring, and coordination with cardiology or maternal-fetal medicine.
- The final billable code usually becomes more specific when the chart identifies maternal timing and the underlying cardiac or vascular diagnosis elsewhere in the record.
- Specialist context already linked on this page includes Obstetrician, Gynecologist.
🔍Key distinctions
Important notes
- This parent page is an umbrella overview for multiple maternal circulatory-system complication codes rather than the most specific billable child code.
- Maternal timing and the underlying cardiovascular diagnosis are the key distinctions across this family.
- This overview page groups maternal circulatory-system-disease codes across pregnancy, childbirth, and the puerperium, so the final billable code usually depends on maternal timing and whether the chart identifies a more specific cardiac or vascular condition.
Important exclusions
- peripartum cardiomyopathy (O90.3)
- hypertensive disorders (O10-O16)
- obstetric embolism (O88.-)
- venous complications and cerebrovenous sinus thrombosis in labor, childbirth and the puerperium (O87.-)
- venous complications and cerebrovenous sinus thrombosis in pregnancy (O22.-)
Related codes to consider
O99.42Diseases of the circulatory system complicating childbirth
Related maternal circulatory-system disease ICD-10 code; documentation often becomes more specific when the chart identifies maternal timing or the underlying cardiac or vascular diagnosis.
O99.43Diseases of the circulatory system complicating the puerperium
Related maternal circulatory-system disease ICD-10 code; documentation often becomes more specific when the chart identifies maternal timing or the underlying cardiac or vascular diagnosis.
Code hierarchy
chapter
15Pregnancy, childbirth and the puerperium (O00-O9A)
block
O94-O9AOther obstetric conditions, not elsewhere classified
category
O99Other maternal diseases classifiable elsewhere but complicating pregnancy, childbirth and the puerperium
currentO99
Official coding notes
Inclusion terms
- Conditions in I00-I99
Excludes1 (do not code together)
- peripartum cardiomyopathy (O90.3)
Excludes2 (may code together if documented)
- hypertensive disorders (O10-O16)
- obstetric embolism (O88.-)
- venous complications and cerebrovenous sinus thrombosis in labor, childbirth and the puerperium (O87.-)
- venous complications and cerebrovenous sinus thrombosis in pregnancy (O22.-)
Where you may see this code
You may see this entry in coding references, medical records, or claims workflows when a broader diagnosis category is being reviewed before a more specific code is chosen.
Related specialists
ObstetricianGynecologist
Related procedures
Obstetric ultrasound
May appear in pregnancy follow-up pathways when maternal diseases complicate pregnancy and fetal well-being is monitored.
Fetal nonstress testing
May be used in selected higher-risk pregnancy monitoring pathways.
Related codes
Sibling codes
O99.0Anemia complicating pregnancy, childbirth and the puerperiumO99.1Other diseases of the blood and blood-forming organs and certain disorders involving the immune mechanism complicating pregnancy, childbirth and the puerperiumO99.2Endocrine, nutritional and metabolic diseases complicating pregnancy, childbirth and the puerperiumO99.3Mental disorders and diseases of the nervous system complicating pregnancy, childbirth and the puerperiumO99.5Diseases of the respiratory system complicating pregnancy, childbirth and the puerperiumO99.6Diseases of the digestive system complicating pregnancy, childbirth and the puerperiumO99.7Diseases of the skin and subcutaneous tissue complicating pregnancy, childbirth and the puerperiumO99.8Other specified diseases and conditions complicating pregnancy, childbirth and the puerperium
Mapped diagnoses and classifications
SNOMED_CT 72281000119102high
Aortic valve disease during pregnancy
Source: SNOMED International ICD-10 map
SNOMED_CT 10743121000119108high
Aortic valve disorder in mother complicating childbirth
Source: SNOMED International ICD-10 map
SNOMED_CT 72291000119104high
Cardiac arrhythmia during pregnancy
Source: SNOMED International ICD-10 map
SNOMED_CT 10743741000119103high
Cardiac arrhythmia in mother complicating childbirth
Source: SNOMED International ICD-10 map
SNOMED_CT 274121004high
Cardiac disease in pregnancy
Source: SNOMED International ICD-10 map
SNOMED_CT 6594005high
Cerebrovascular disorder in the puerperium
Source: SNOMED International ICD-10 map
Coding guidelines
Compatibility
Legacy code aligns to an official FY 2026 category. Frontend should resolve to the official category page and surface the billable child codes.
Legacy codes
O99.4
Replacement codes
O99.42 — Diseases of the circulatory system complicating childbirthO99.43 — Diseases of the circulatory system complicating the puerperium
Common synonyms
Diseases of the circulatory system complicating pregnancy, childbirth and the puerperium
Frequently asked questions
About this content
This page is prepared by HealthAssure's clinical team using official coding standards from ICD-10. AI tools assist with drafting explanations, which are then reviewed and verified by healthcare professionals for accuracy. This content is for informational purposes and does not replace professional medical advice. Meet our team.