NPI Atlas

H70.91 – Unspecified mastoiditis, right ear

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

Billable code

ICD-10-CM code H70.91

Code: H70.91 (claims format: H7091)
Description: Unspecified mastoiditis, 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: H70 › H70.9

Related codes in H70.9

H70.90 – Unspecified mastoiditis, unspecified earBillable
H70.92 – Unspecified mastoiditis, left earBillable
H70.93 – Unspecified mastoiditis, bilateralBillable

Frequently asked questions

What is ICD-10 code H70.91?

H70.91 is the ICD-10-CM code for unspecified mastoiditis, right ear, in the block H65-H75 (Diseases of middle ear and mastoid).

Is H70.91 a billable code?

Yes. H70.91 is a billable/specific code that can be used to indicate a diagnosis for reimbursement purposes.

What category does H70.91 belong to?

It belongs to category H70 – Mastoiditis and related conditions.

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.