ICD-10 Logo
ICDxICD-10 Medical Coding
ICD-10 Logo
ICDxICD-10 Medical Coding
ICD 10 CodesDiagnoses
ICD 10 CodesDiagnoses
ICD-10 Logo
ICDxICD-10 Medical Coding

Comprehensive ICD-10-CM code reference with AI-powered search capabilities.

© 2025 ICD Code Compass. All rights reserved.

Browse

  • All Chapters
  • All Categories
  • Diagnoses

Tools

  • AI Code Search
ICD-10-CM codes are maintained by the CDC and CMS. This tool is for reference purposes only.
v1.0.0
ICD-10 Guide
DiagnosesMacrocytosis

Macrocytosis

ICD-10 Coding for Macrocytosis(D51.0, R71.8)

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

Diagnosis Overview

What is Macrocytosis?
Essential facts and insights about Macrocytosis

Key Clinical Considerations:

  • Fatigue, weakness, pallor
  • Mean corpuscular volume (MCV) > 100 fL, macrocytic anemia on complete blood count (CBC)
  • Enlarged spleen (splenomegaly), signs of underlying vitamin deficiency

Clinical Information

Clinical Criteria & Documentation Requirements

  • Patient history including symptoms and duration, laboratory results, and any underlying conditions
  • ICD-10-CM terminology such as 'macrocytic anemia', 'vitamin B12 deficiency', 'folate deficiency'
  • Example: 'Patient presents with macrocytosis confirmed by CBC showing MCV of 105 fL.'

Coding Guidelines

Usage Guidelines & Examples

  • Follow guidelines for coding macrocytic anemia based on underlying causes.
  • Common errors include misclassifying macrocytosis as normocytic anemia.

Code Exclusions

Important Exclusions

  • Thalassemia, myelodysplastic syndromes
  • Alternative codes for normocytic or microcytic anemia

Related ICD-10 Codes

Primary Codes
D64.9
Anemia, unspecified
D53.1
Vitamin B12 deficiency anemia
D50.9
Iron deficiency anemia, unspecified
Ancillary Codes
R71.8
Differential Codes
D52.0
B12
.
D51.0
D51.0
if
B12
deficiency is confirmed.

Related CPT Codes

CPT codes will be available in a future update.

Specialty Focus

Primary Specialty

Hematology

Specialty Applications

  • Patients with nutritional deficiencies, chronic alcoholism, liver disease
  • Hematology clinics, primary care settings, emergency departments

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

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

Documentation requirements?

Document the patient's symptoms, lab results, and any relevant medical history.

Billing considerations?

Ensure accurate coding of underlying causes to avoid claim denials.