ICD-10-CM 2027 diagnosis code

H66.3XOther chronic suppurative otitis media

Not billable — use a more specific code

H66.3X 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 H66.3X

H66.3X is the ICD-10-CM diagnosis code for other chronic suppurative otitis media. It belongs to category H66 (suppurative and unspecified otitis media), 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: H66.3X1 (right ear), H66.3X2 (left ear), H66.3X3 (bilateral) and H66.3X9 (unspecified ear).

Use an additional code to identify: exposure to environmental tobacco smoke (Z77.22), exposure to tobacco smoke in the perinatal period (P96.81), history of tobacco dependence (Z87.891), occupational exposure to environmental tobacco smoke (Z57.31), tobacco dependence (F17.-) and 1 more.

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 H66.3X

Notes that apply from higher levels

Instructions written at a parent level also apply to H66.3X.

› From H66.3 Other chronic suppurative otitis media

Excludes1

tuberculous otitis media (A18.6)

Use additional code

code for any associated perforated tympanic membrane (H72.-)

› From H66 Suppurative and unspecified otitis media

Includes

suppurative and unspecified otitis media with myringitis

Use additional code

code to identify:
exposure to environmental tobacco smoke (Z77.22)
exposure to tobacco smoke in the perinatal period (P96.81)
history of tobacco dependence (Z87.891)
occupational exposure to environmental tobacco smoke (Z57.31)
tobacco dependence (F17.-)
tobacco use (Z72.0)

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 H66.3X

Is H66.3X billable?: No. H66.3X is a header code. Report one of its more specific subcodes instead.