ICD10
ICD-10 Code O99.41: Diseases of the circulatory system complicating pregnancy
Reviewed by HealthAssure Clinical TeamUpdated 21 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 code is commonly used when documentation describes a maternal circulatory-system disease complicating pregnancy, childbirth, or the puerperium. The most accurate code depends on maternal timing and whether the chart more specifically identifies the underlying cardiac or vascular diagnosis elsewhere in the record.
When is it used?
- May be used when a clinician documents diseases of the circulatory system complicating pregnancy 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
- Obstetric, cardiology, maternal-fetal medicine, inpatient, delivery, postpartum, and prenatal documentation where maternal circulatory disease materially affects pregnancy monitoring or management.
- Coding and utilization-review workflows where the record clearly ties maternal circulatory-system disease to pregnancy, childbirth, or the puerperium and maternal timing changes the final complication code.
Common workup
- Related procedures or service context already linked on this page include Obstetric ultrasound, Fetal nonstress testing.
Common management context
- Maternal circulatory-system disease follow-up often includes blood-pressure or cardiovascular assessment context, medication review, obstetric monitoring, and coordination with cardiology or maternal-fetal medicine.
- Documentation usually becomes more specific when the chart identifies trimester or delivery timing, the underlying cardiac or vascular diagnosis, severity, and whether additional maternal-fetal surveillance is needed.
- Specialist context already linked on this page includes Obstetrician, Gynecologist.
🔍Key distinctions
Important notes
- This ICD-10 family captures maternal circulatory-system disease as a pregnancy-related, childbirth-related, or puerperium-related complication, while separate diagnosis coding may still carry the underlying cardiovascular disorder detail documented elsewhere in the chart.
- Trimester or maternal timing detail matters, and clearer chart language about the underlying cardiac or vascular condition can add specificity beyond this broad maternal complication family.
- This title reflects maternal circulatory-system disease complicating pregnancy, which is coded separately from similar maternal circulatory complications during childbirth or the puerperium.
Related codes to consider
O99.411Diseases of the circulatory system complicating pregnancy, first trimester
Related maternal circulatory-system disease ICD-10 code; documentation often becomes more specific when the chart identifies trimester or delivery timing, the underlying cardiovascular diagnosis, or clearer pregnancy context.
O99.412Diseases of the circulatory system complicating pregnancy, second trimester
Related maternal circulatory-system disease ICD-10 code; documentation often becomes more specific when the chart identifies trimester or delivery timing, the underlying cardiovascular diagnosis, or clearer pregnancy context.
O99.413Diseases of the circulatory system complicating pregnancy, third trimester
Related maternal circulatory-system disease ICD-10 code; documentation often becomes more specific when the chart identifies trimester or delivery timing, the underlying cardiovascular diagnosis, or clearer pregnancy context.
O99.419Diseases of the circulatory system complicating pregnancy, unspecified trimester
Related maternal circulatory-system disease ICD-10 code; documentation often becomes more specific when the chart identifies trimester or delivery timing, the underlying cardiovascular diagnosis, or clearer pregnancy context.
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
category
O99.4Diseases of the circulatory system complicating pregnancy, childbirth and the puerperium
currentO99.4
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
O99.411Diseases of the circulatory system complicating pregnancy, first trimestercodeO99.412Diseases of the circulatory system complicating pregnancy, second trimestercodeO99.413Diseases of the circulatory system complicating pregnancy, third trimestercodeO99.419Diseases of the circulatory system complicating pregnancy, unspecified trimestercode
Sibling codes
Coding guidelines
Common synonyms
Diseases of the circulatory system complicating pregnancy
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.