ICD-10-CM 2027 diagnosis code
N64.8Other specified disorders of breast
N64.8 is a header code, so it can't be reported by itself. Choose one of the 3 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 N64.8
N64.8 is the ICD-10-CM diagnosis code for other specified disorders of breast. It belongs to category N64 (other disorders of breast), 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 3 subcodes must be used instead.
Within N64, choose N64.8 (Other specified disorders of breast) only when documentation doesn't support a more specific option: fissure and fistula of nipple (N64.0), fat necrosis of breast (N64.1), atrophy of breast (N64.2), Galactorrhea not associated with childbirth (N64.3), Mastodynia (N64.4), other signs and symptoms in breast (N64.5) and disorder of breast, unspecified (N64.9).
To report this condition, pick the subcode that matches the documentation: N64.81 (breast), N64.82 (breast) and N64.89 (breast).
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 N64.8
Notes that apply from higher levels
Instructions written at a parent level also apply to N64.8.
› From N64 Other disorders of breast
- mechanical complication of breast prosthesis and implant (T85.4-)
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 N64.8
Is N64.8 billable?
- No. N64.8 is a header code. Report one of its more specific subcodes instead.