ICD10
ICD-10 Code O99.0: Anemia 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 code is commonly used when documentation describes anemia complicating pregnancy, childbirth, or the puerperium. The most accurate code depends on the maternal timing context and whether the chart later identifies a more specific anemia type or cause.
When is it used?
- May be used when a clinician documents anemia 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
- Obstetric, prenatal, inpatient, and postpartum documentation where maternal anemia affects pregnancy monitoring, delivery planning, or recovery follow-up.
- Coding and utilization-review workflows where trimester or delivery timing is known and anemia materially affects maternal care.
Common workup
- Common related testing on this page includes Complete blood count, Ferritin, Iron studies.
- Related procedures or service context already linked on this page include Obstetric ultrasound, Fetal nonstress testing.
Common management context
- Maternal-anemia follow-up often includes hemoglobin or CBC review, iron-status evaluation context, medication or supplement review, and monitoring for delivery-related blood-loss risk.
- Documentation usually becomes more specific when the chart identifies iron deficiency, blood loss, chronic disease, or the exact pregnancy, childbirth, or puerperium timing.
- Specialist context already linked on this page includes Obstetrician, Gynecologist, Hematologist.
🔍Key distinctions
Important notes
- This ICD-10 family is used when maternal anemia complicates pregnancy-related care, but separate codes may still be needed when the anemia type or underlying cause is clearly documented.
- Trimester and delivery timing matter, while more specific anemia-type documentation can add clinical context beyond this maternal-complication code alone.
- This title reflects anemia complicating pregnancy, which is coded separately from anemia during childbirth or the puerperium.
- Maternal anemia during childbirth is coded separately from antepartum or postpartum encounters because the delivery context changes management and blood-loss considerations.
- Puerperium or postpartum maternal-anemia documentation is coded separately from pregnancy or childbirth encounters because the maternal recovery context has changed.
Important exclusions
- anemia arising in the puerperium (O90.81)
- postpartum anemia NOS (O90.81)
Related codes to consider
O99.02Anemia complicating childbirth
Related maternal-anemia ICD-10 code; documentation often becomes more specific when the chart identifies trimester, delivery timing, or the underlying anemia cause.
O99.03Anemia complicating the puerperium
Related maternal-anemia ICD-10 code; documentation often becomes more specific when the chart identifies trimester, delivery timing, or the underlying anemia cause.
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 D50-D64
Excludes1 (do not code together)
- anemia arising in the puerperium (O90.81)
- postpartum anemia NOS (O90.81)
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
ObstetricianGynecologistHematologist
Related tests
Complete blood count
Commonly reviewed when assessing anemia complicating pregnancy.
Ferritin
May help evaluate iron deficiency in pregnancy-related anemia workup.
Iron studies
May be reviewed when anemia in pregnancy raises concern for iron deficiency.
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.
Sibling codes
O99.1Other 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 puerperiumO99.4Diseases of the circulatory 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 238419741000119109high
Alpha thalassaemia trait in mother complicating pregnancy
Source: SNOMED International ICD-10 map
SNOMED_CT 313291009high
Anaemia during the puerperium
Source: SNOMED International ICD-10 map
SNOMED_CT 10741751000119100high
Anemia in mother complicating childbirth
Source: SNOMED International ICD-10 map
SNOMED_CT 45828008high
Anemia in mother complicating pregnancy, childbirth AND/OR puerperium
Source: SNOMED International ICD-10 map
SNOMED_CT 27342004high
Anemia of pregnancy
Source: SNOMED International ICD-10 map
SNOMED_CT 413567003high
Aplastic anemia associated with pregnancy
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
O99.0
Replacement codes
O99.02 — Anemia complicating childbirthO99.03 — Anemia complicating the puerperium
Common synonyms
Anemia 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.