H70.9
Header — not billableUnspecified 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.
- •This is a non-billable header code. Documentation must support a more specific child code before this diagnosis can be reported on a claim.
- •This code describes an unspecified presentation. If the medical record documents a more specific detail (e.g. laterality, type, or affected site), a more specific sibling code should be used instead — see Related codes below.
- •As a general rule, code to the highest level of specificity supported by the documentation in the medical record.
Related codes in this category
- H70.0Acute mastoiditisnon-billable header
- H70.1Chronic mastoiditisnon-billable header
- H70.2Petrositisnon-billable header
- H70.8Other mastoiditis and related conditionsnon-billable header
- H70.9Unspecified mastoiditisnon-billable header