ICD-10-CM 2027 diagnosis code

N64Other disorders of breast

Not billable — use a more specific code

N64 is a header code, so it can't be reported by itself. Choose one of the 8 more specific codes beneath it.

Code unchanged since ICD-10-CM took effect on October 1, 2015. Source: official FY2027 ICD-10-CM release from CDC/NCHS and CMS. Page updated September 29, 2026. About our data

About N64

N64 is the ICD-10-CM diagnosis code for other disorders of breast. It belongs to block N60-N65 (disorders of breast) and chapter 14 (diseases of the genitourinary system). It is a header code, so it can't be reported by itself; one of its 8 subcodes must be used instead.

To report this condition, pick the subcode that matches the documentation: N64.0 (nipple), N64.1 (breast), N64.2 (breast), N64.3 (childbirth), N64.4 (Mastodynia), N64.5 (breast), N64.8 (breast) and N64.9 (unspecified).

The conditions in its Excludes2 note aren't part of N64, but may be coded alongside it if the patient has both: mechanical complication of breast prosthesis and implant (T85.4-).

It has been part of ICD-10-CM since the code set took effect on October 1, 2015 and hasn't changed since.

Specific codes under N64

Coding notes

Excludes2Not included here — may be reported together if both conditions exist

mechanical complication of breast prosthesis and implant (T85.4-)

Notes that apply from higher levels

Instructions written at a parent level also apply to N64.

Broader instructions also apply from N60-N65 Disorders of breast and Chapter 14: Diseases of the genitourinary system.

Code history

2016
2017
2018
2019
2020
2021
2022
2023
2024
2025
2026
2027

FY2016 (effective 10/1/2015): Added (first year of ICD-10-CM)
No changes since FY2016.

Common questions about N64

Is N64 billable?: No. N64 is a header code. Report one of its more specific subcodes instead.