ICD-10-CM H70.1 is the diagnosis code for Chronic mastoiditis. This code falls under the section "Diseases of middle ear and mastoid" within Chapter 8 — Diseases of the ear and mastoid process (H60-H95). It is a non-billable/non-specific ICD-10-CM code that should not be used for reimbursement. A more specific sub-code is required for billing. Medical coders and healthcare providers use this code to document and classify diagnoses in electronic health records, insurance claims, and clinical databases.
The following conditions should never be coded at the same time as H70.1. They are mutually exclusive:
Understanding where H70.1 sits in the ICD-10-CM classification helps ensure proper coding:
No, H70.1 is a non-billable/non-specific code. You should use a more specific sub-code for billing and reimbursement.
H70.1 is the ICD-10-CM diagnosis code for "Chronic mastoiditis". It is used by healthcare providers to classify and document this condition in medical records and insurance claims.
The parent code of H70.1 is H70 ("Mastoiditis and related conditions"). H70.1 provides a more specific classification within this category.
H70.1 is located in Section H65-H75 — "Diseases of middle ear and mastoid" within Chapter 8 of the ICD-10-CM Tabular List.
H70.1 has 4 sub-code(s) that provide more specific detail: H70.10, H70.11, H70.12, H70.13.
Use H70.1 when the patients documented diagnosis matches "Chronic mastoiditis" and the clinical documentation supports this level of specificity. Always verify with the latest ICD-10-CM guidelines and payer requirements.
The ICD-10-CM code for Chronic mastoiditis is H70.1.
No, H70.1 is non-billable. Use a more specific sub-code for primary diagnosis billing.
H70.1 is in Chapter 8 of the ICD-10-CM Tabular List.
Type 1 Excludes for H70.1 include: tuberculous mastoiditis (A18.03).
Yes, H70.1 is a valid ICD-10-CM code for the 2026 fiscal year, subject to official CMS updates.