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H70.9

Non-billable

Unspecified mastoiditis

H70.9 is the ICD-10-CM code for Unspecified mastoiditis. It is a non-billable category code — use a more specific child code such as H70.90 for billing.

Status
Header (non-billable)
Chapter
H60-H95
Parent
H70
Subcodes
4
Edition
FY2026

H60-H95 Diseases of the ear and mastoid process

No additional coding notes for this code.

Frequently asked questions

What is ICD-10 code H70.9?
H70.9 is the ICD-10-CM code for "Unspecified mastoiditis". It falls under H60-H95 Diseases of the ear and mastoid process.
Is H70.9 a billable code?
No — H70.9 is a non-billable header code. Use a more specific child code (such as H70.90) for billing.
What are the subcodes of H70.9?
H70.9 has 4 more specific child codes, including H70.90, H70.91, H70.92.

Source: CMS ICD-10-CM FY2026. For informational purposes only — not medical advice. See our medical disclaimer.

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