H66.21 – Chronic atticoantral suppurative otitis media, right ear

ICD-10-CM 2027 diagnosis code · Diseases of middle ear and mastoid

Billable code

ICD-10-CM code H66.21

Code: H66.21 (claims format: H6621)
Description: Chronic atticoantral suppurative otitis media, right ear
Billable: Yes – valid for HIPAA-covered transactions
Valid for: Dates of service October 1, 2026 – September 30, 2027 (FY2027)
Chapter: 8. Diseases of the ear and mastoid process (H60-H95)
Block: H65-H75 Diseases of middle ear and mastoid
Parent codes: H66 › H66.2

Notes inherited from parent codes

Instructional notes at a category or block level apply to every code below it.

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)

H66.2 – Chronic atticoantral suppurative otitis media

Applicable to:

Chronic atticoantral disease

Use additional code:

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

Index terms for H66.21

Entries in the ICD-10-CM alphabetic index that lead to this code:

Related codes in H66.2

Frequently asked questions

What is ICD-10 code H66.21?

H66.21 is the ICD-10-CM code for chronic atticoantral suppurative otitis media, right ear, in the block H65-H75 (Diseases of middle ear and mastoid).

Is H66.21 a billable code?

Yes. H66.21 is a billable/specific code that can be used to indicate a diagnosis for reimbursement purposes.

What category does H66.21 belong to?

It belongs to category H66 – Suppurative and unspecified otitis media.

Source: CDC/NCHS ICD-10-CM FY2027 code files, tabular list and index. Reference only – code assignment must follow the official ICD-10-CM guidelines and documentation in the medical record.