2026 ICD-10-CM Diagnosis Code N64Other disorders of breast

ICD-10-CM Codes›N00–N99›N60-N65›N64

ICD-10-CM N64
CMSSource: CMS FY 2026 ICD-10-CM dataset · Effective Oct 1, 2025 – Sep 30, 2026

N64 is a non-billable ICD-10-CM category code for other disorders of breast, so it cannot be submitted on claims. Use a more specific code from this category instead, such as N64.0, N64.1, N64.2, and N64.3.

Code Identity

ICD-10-CM Code
N64
Billable Status
No — Non-Billable Category
Code Describes
Other disorders of breast
Chapter
N60-N65
Disorders of breast

Code Classification

ChapterN00–N99Diseases of the genitourinary system
SectionN60-N65Disorders of breast
CategoryN64Other disorders of breast
This CodeN64Other disorders of breast

Specific Coding for Other disorders of breastOverview

Non-specific codes like N64 require more characters. Use one of these billable codes instead:

  • Use N64.0 for Fissure and fistula of nipple

  • Use N64.1 for Fat necrosis of breast

  • Use N64.2 for Atrophy of breast

  • Use N64.3 for Galactorrhea not associated with childbirth

  • Use N64.4 for Mastodynia

  • N64.5 for Other signs and symptoms in breast

  • Use N64.51 for Induration of breast

  • Use N64.52 for Nipple discharge

  • Use N64.53 for Retraction of nipple

  • Use N64.59 for Other signs and symptoms in breast

  • N64.8 for Other specified disorders of breast

  • Use N64.81 for Ptosis of breast

  • Use N64.82 for Hypoplasia of breast

  • Use N64.89 for Other specified disorders of breast

  • Use N64.9 for Disorder of breast, unspecified

Tabular List NotesGuidance

Coding notes and annotation back-references applicable to this code.

Type 2 Excludes

  • mechanical complication of breast prosthesis and implant T85.4

Patient EducationClinical

Breast Diseases

Breast diseases include various conditions and changes in your breast. Most women experience breast changes at some time. Your age, hormone levels, and medicines you take may cause lumps, bumps, and discharges of fluids that are not breast milk.

The full article covers:

  • What are breast diseases?
  • What are the symptoms of breast disease?
  • How are breast diseases diagnosed?
  • What are the treatments for breast disease?

Read the full article at MedlinePlus

Courtesy of MedlinePlus, a service of the U.S. National Library of Medicine.

Code HistoryHistory

FY 2016AddedAdded to the ICD-10-CM code setEffective October 1, 2015, the first year of ICD-10-CM.
FY 2017–2025No changes
FY 2026CurrentCurrent code set, no changesEffective October 1, 2025 through September 30, 2026.

Questions About N64Overview

Is N64 (Other disorders of breast) a billable code?

No. This is a category header that groups the codes for other disorders of breast, and headers cannot be submitted on claims. Claims for other disorders of breast need a more specific code from this category, such as N64.0, N64.1, and N64.2.