ICD-10-CM 2027 diagnosis code

H74.8XOther specified disorders of middle ear and mastoid

Not billable — use a more specific code

H74.8X is a header code, so it can't be reported by itself. Choose one of the 4 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 H74.8X

H74.8X is the ICD-10-CM diagnosis code for other specified disorders of middle ear and mastoid. It belongs to category H74 (other disorders of middle ear mastoid), block H65-H75 (diseases of middle ear and mastoid) and chapter 8 (diseases of the ear and mastoid process). It is a header code, so it can't be reported by itself; one of its 4 subcodes must be used instead.

To report this condition, pick the subcode that matches the documentation: H74.8X1 (mastoid), H74.8X2 (mastoid), H74.8X3 (bilateral) and H74.8X9 (unspecified ear).

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 H74.8X

Notes that apply from higher levels

Instructions written at a parent level also apply to H74.8X.

› From H74 Other disorders of middle ear mastoid

Excludes2

mastoiditis (H70.-)

Broader instructions also apply from Chapter 8: Diseases of the ear and mastoid process.

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 H74.8X

Is H74.8X billable?: No. H74.8X is a header code. Report one of its more specific subcodes instead.