2027 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 2027 ICD-10-CM dataset · Effective Oct 1, 2026 – Sep 30, 2027

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
Short Description
Other disorders of breast
Same as the full description in the CMS dataset.
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

Instructional NotesGuidance

Instructions from the official ICD-10-CM Tabular List that apply to N64: its own notes plus those printed at block N60-N65 and Chapter 14. A note printed at a category, block or chapter applies to every code under it.

Excludes1

Not coded here: the excluded code is never reported together with this one, unless the two conditions are unrelated.

From Block N60-N65 Disorders of breast applies to 60 codes
  • disorders of breast associated with childbirth (O91-O92)

Excludes2

Not included here: the excluded condition is not part of this code, but a patient may have both, so both codes may be reported.

On N64 itself
  • mechanical complication of breast prosthesis and implant (T85.4-)
From Chapter 14 (N00-N99) Diseases of the genitourinary system applies to 838 codes
  • certain conditions originating in the perinatal period (P04-P96)
  • certain infectious and parasitic diseases (A00-B99)
  • complications of pregnancy, childbirth and the puerperium (O00-O9A)
  • congenital malformations, deformations and chromosomal abnormalities (Q00-Q99)
  • endocrine, nutritional and metabolic diseases (E00-E88)
  • injury, poisoning and certain other consequences of external causes (S00-T88)
  • neoplasms (C00-D49)
  • symptoms, signs and abnormal clinical and laboratory findings, not elsewhere classified (R00-R94)

Source: CMS ICD-10-CM Tabular List. How to read instructional notes.

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 2017–2026No changes
FY 2027CurrentCurrent code set, no changesEffective October 1, 2026 through September 30, 2027.

Questions About N64Overview

What is the ICD-10 code for other disorders of breast?

N64 is the ICD-10-CM category for other disorders of breast, but it is a non-billable header: claims need a more specific code from this category, listed on this page.

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.