ICD10BillableValid for clinical use
ICD-10 Code N64.1: Fat necrosis of breast
Reviewed by HealthAssure Clinical TeamUpdated 26 May 2026
What is this code?
ICD-10 codes are diagnosis classification codes used in healthcare records, reporting, coding workflows, and billing support. This code sits within the broader ICD-10 area for Diseases of the genitourinary system (N00-N99).
When is it used?
- May be used when a clinician documents fat necrosis of breast in a patient's medical record.
- May appear in hospital records, claims, referrals, and clinical documentation.
- This code can be used as a clinically usable diagnosis entry in standardized coding workflows.
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.
Code hierarchy
chapter
14Diseases of the genitourinary system (N00-N99)
block
N60-N65Disorders of breast
category
N64Other disorders of breast
currentN64
Official coding notes
Inclusion terms
- Fat necrosis (segmental) of breast
Applicable to
- breast necrosis due to breast graft (T85.898)
Code first
- breast necrosis due to breast graft (T85.898)
Where you may see this code
You may see this code in hospital records, discharge summaries, insurance claims, encounter documentation, referrals, or other healthcare billing and coding records.
Related specialists
UrologistGynecologist
Related codes
Sibling codes
Coverage-related procedures and services
CPT 19318high
BREAST REDUCTION
Source: CMS coverage guidance
CPT 19300high
MASTECTOMY FOR GYNECOMASTIA
Source: CMS coverage guidance
CPT 19325high
BREAST AUGMENTATION WITH IMPLANT
Source: CMS coverage guidance
CPT 19369high
BREAST RECONSTRUCTION; WITH BIPEDICLED TRANSVERSE RECTUS ABDOMINIS MYOCUTANEOUS (TRAM) FLAP
Source: CMS coverage guidance
CPT 19364high
BREAST RECONSTRUCTION; WITH FREE FLAP (EG, FTRAM, DIEP, SIEA, GAP FLAP)
Source: CMS coverage guidance
CPT 19361high
BREAST RECONSTRUCTION; WITH LATISSIMUS DORSI FLAP
Source: CMS coverage guidance
Mapped diagnoses and classifications
SNOMED_CT 15954301000119104high
Bilateral fat necrosis of breasts
Source: SNOMED International ICD-10 map
SNOMED_CT 21381006high
Fat necrosis of breast
Source: SNOMED International ICD-10 map
SNOMED_CT 15954261000119107high
Fat necrosis of left breast
Source: SNOMED International ICD-10 map
SNOMED_CT 15954341000119102high
Fat necrosis of right breast
Source: SNOMED International ICD-10 map
Coding guidelines
Compatibility
Legacy and official ICD code match exactly.
Legacy codes
N64.1
Common synonyms
Fat necrosis of breast
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.