2021 ICD-10-CM Code N64.9

Disorder of breast, unspecified

Version 2021
Billable Code
Unspecified Code
MS-DRG Mapping
OB/GYN

Valid for Submission

N64.9 is a billable diagnosis code used to specify a medical diagnosis of disorder of breast, unspecified. The code N64.9 is valid during the fiscal year 2021 from October 01, 2020 through September 30, 2021 for the submission of HIPAA-covered transactions.

The ICD-10-CM code N64.9 might also be used to specify conditions or terms like abnormal nipple, breast problem, chronic disease of breast, disorder of breast, disorder of nipple , lesion of breast, etc.

The code is commonly used in ob/gyn medical specialties to specify clinical concepts such as lump in breast and other disorders of the breast.

Unspecified diagnosis codes like N64.9 are acceptable when clinical information is unknown or not available about a particular condition. Although a more specific code is preferable, unspecified codes should be used when such codes most accurately reflect what is known about a patient's condition. Specific diagnosis codes should not be used if not supported by the patient's medical record.

ICD-10:N64.9
Short Description:Disorder of breast, unspecified
Long Description:Disorder of breast, unspecified

Code Classification

Index to Diseases and Injuries

The Index to Diseases and Injuries is an alphabetical listing of medical terms, with each term mapped to one or more ICD-10 code(s). The following references for the code N64.9 are found in the index:

Approximate Synonyms

The following clinical terms are approximate synonyms or lay terms that might be used to identify the correct diagnosis code:

Convert N64.9 to ICD-9 Code

Information for Patients


Breast Diseases

Most women experience breast changes at some time. Your age, hormone levels, and medicines you take may cause lumps, bumps, and discharges (fluids that are not breast milk).

If you have a breast lump, pain, discharge or skin irritation, see your health care provider. Minor and serious breast problems have similar symptoms. Although many women fear cancer, most breast problems are not cancer.

Some common breast changes are

NIH: National Cancer Institute


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Code History

  • FY 2021 - No Change, effective from 10/1/2020 through 9/30/2021
  • FY 2020 - No Change, effective from 10/1/2019 through 9/30/2020
  • FY 2019 - No Change, effective from 10/1/2018 through 9/30/2019
  • FY 2018 - No Change, effective from 10/1/2017 through 9/30/2018
  • FY 2017 - No Change, effective from 10/1/2016 through 9/30/2017
  • FY 2016 - New Code, effective from 10/1/2015 through 9/30/2016 (First year ICD-10-CM implemented into the HIPAA code set)