ICD-10-CM 2027 diagnosis code

H74Other disorders of middle ear mastoid

Not billable — use a more specific code

H74 is a header code, so it can't be reported by itself. Choose one of the 7 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

H74 is the ICD-10-CM diagnosis code for other disorders of middle ear mastoid. It belongs to 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 7 subcodes must be used instead.

To report this condition, pick the subcode that matches the documentation: H74.0 (Tympanosclerosis), H74.1 (disease), H74.2 (ossicles), H74.3 (ossicles), H74.4 (ear), H74.8 (mastoid) and H74.9 (mastoid).

The conditions in its Excludes2 note aren't part of H74, but may be coded alongside it if the patient has both: mastoiditis (H70.-).

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

Coding notes

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

mastoiditis (H70.-)

Notes that apply from higher levels

Instructions written at a parent level also apply to H74.

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

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