H70.1
Non-billableChronic mastoiditis
H70.1 is the ICD-10-CM code for Chronic mastoiditis. It is a non-billable category code — use a more specific child code such as H70.10 for billing.
H60-H95 Diseases of the ear and mastoid process
Includes
- •Caries of mastoid
- •Fistula of mastoid
Excludes1 — not coded here
- •tuberculous mastoiditis (A18.03)
Frequently asked questions
- What is ICD-10 code H70.1?
- H70.1 is the ICD-10-CM code for "Chronic mastoiditis". It falls under H60-H95 Diseases of the ear and mastoid process.
- Is H70.1 a billable code?
- No — H70.1 is a non-billable header code. Use a more specific child code (such as H70.10) for billing.
- What are the subcodes of H70.1?
- H70.1 has 4 more specific child codes, including H70.10, H70.11, H70.12.
- What is excluded from H70.1?
- Excludes1 (not coded here): tuberculous mastoiditis (A18.03).
Source: CMS ICD-10-CM FY2026. For informational purposes only — not medical advice. See our medical disclaimer.
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