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ICD-10 Guide
DiagnosesAnemia In Pregnancy

Anemia In Pregnancy

ICD-10 Coding for Anemia in Pregnancy(O99.011, O99.012, O99.013)

PRIMARY SPECIALTYObstetrics
COMPLEXITYHigh
LAST UPDATED09/15/2025
Sam Tuffun, PT, DPT
Physical Therapist | Medical Coding & Billing Contributor

Diagnosis Overview

What is Anemia In Pregnancy?
Essential facts and insights about Anemia in Pregnancy

Key Clinical Considerations:

  • Symptoms may include fatigue, weakness, pallor, and shortness of breath.
  • Laboratory findings typically include hemoglobin levels below 11 g/dL in the first and third trimesters, and below 10.5 g/dL in the second trimester.
  • Physical examination may reveal signs of pallor, tachycardia, or hypotension.
  • Imaging is generally not required for diagnosis but may be used to rule out other conditions.
  • Severity is often classified as mild (10-11 g/dL), moderate (7-10 g/dL), or severe (<7 g/dL) based on hemoglobin levels.

Clinical Information

Clinical Criteria & Documentation Requirements

  • Document the patient's hemoglobin and hematocrit levels along with the trimester of pregnancy.
  • Use specific terminology such as 'iron deficiency anemia' or 'folate deficiency anemia' when applicable.
  • Examples include: 'Patient presents with fatigue and hemoglobin of 9.5 g/dL, diagnosed with moderate anemia in pregnancy.'
  • Medical necessity must be established through documentation of symptoms and laboratory results.
  • Quality measures may include tracking hemoglobin levels and treatment response.

Coding Guidelines

Usage Guidelines & Examples

  • Use O99.011 for mild anemia, O99.012 for moderate anemia, and O99.013 for severe anemia in pregnancy.
  • Do not use these codes for anemia unrelated to pregnancy or for conditions like chronic anemia.
  • Related codes include D50.0 for iron deficiency anemia and D64.9 for unspecified anemia.
  • Common errors include misclassifying the severity of anemia or failing to document the trimester.
  • In complex cases, ensure to document all contributing factors and co-morbidities.

Code Exclusions

Important Exclusions

  • Excludes anemia due to chronic disease or malignancy.
  • Alternative codes for excluded conditions include D63.8 for anemia in chronic disease.
  • Conditions are excluded to ensure accurate representation of pregnancy-related anemia.
  • Common mistakes include coding anemia without confirming pregnancy status.
  • Related but distinct conditions include aplastic anemia and hemolytic anemia.

Related ICD-10 Codes

Primary Codes
O99.011
Mild anemia in pregnancy
O99.012
Moderate anemia in pregnancy
O99.013
Severe anemia in pregnancy
Ancillary Codes
D50.9
Differential Codes
O26.89
O26.89
if anemia is due to pregnancy-related hemodilution without pre-existing condition.

Related CPT Codes

CPT codes will be available in a future update.

Specialty Focus

Primary Specialty

Obstetrics

Specialty Applications

  • Applies to pregnant women diagnosed with anemia during any trimester.
  • Patient populations include women of childbearing age, particularly those with dietary deficiencies.
  • Clinical settings include obstetric clinics, hospitals, and emergency departments.
  • Specialty-specific applications are relevant in obstetrics and maternal-fetal medicine.
  • Treatment contexts include prenatal care and management of anemia during labor.

Coding Complexity

High Complexity

This diagnosis requires careful attention to:

  • Comprehensive clinical documentation
  • Accurate code selection based on clinical criteria
  • Proper exclusion considerations
  • Specialty-specific coding guidelines

Documentation

Documentation Templates

Template 1

Template: 'Patient diagnosed with anemia in pregnancy based on hemoglobin of [value].'

Template 2

Template: 'Clinical presentation consistent with moderate anemia including fatigue and pallor.'

Template 3

Template: 'Diagnostic criteria met as evidenced by hemoglobin levels below 10.5 g/dL.'

Template 4

Template: 'Treatment plan initiated for anemia with iron supplementation.'

Template 5

Template: 'Follow-up care for anemia in pregnancy including monitoring hemoglobin levels.'

Billing Information

Billing Considerations

  • Ensure proper documentation for billing
  • Verify code specificity requirements
  • Check for any additional codes needed
  • Review payer-specific guidelines

Common Issues

  • Insufficient clinical documentation
  • Incorrect code selection
  • Missing supporting diagnoses
  • Timing and frequency documentation

Frequently Asked Questions

What documentation is required for this diagnosis?

Document hemoglobin levels, symptoms, and trimester.

How does this differ from similar diagnoses?

Differentiated by severity and relation to pregnancy.

What are common billing considerations?

Ensure accurate coding to reflect severity for reimbursement.

What procedures are typically associated?

CPT codes for iron supplementation or transfusion may apply.

Are there any quality reporting implications?

Monitor hemoglobin levels as part of quality measures.