10ICD Code Hub

H70.9

Header — not billable

Unspecified mastoiditis

The ICD-10 code for unspecified mastoiditis is H70.9.

H70.9 is a non-billable header code. It groups related conditions but cannot be used on its own for reimbursement — select one of the 4 more specific codes below.

Documentation support

General coding-documentation guidance — not a substitute for payer-specific requirements or professional coding judgment.

Child codes under H70.9

Related codes in this category