H70.009
Billable codeAcute mastoiditis without complications, unspecified ear
The ICD-10 code for acute mastoiditis without complications, unspecified ear is H70.009.
Documentation support
General coding-documentation guidance — not a substitute for payer-specific requirements or professional coding judgment.
- •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.
- •Laterality-specific codes exist for this condition — confirm the affected side is documented.
- •As a general rule, code to the highest level of specificity supported by the documentation in the medical record.
Related codes in this category
- H70.001Acute mastoiditis without complications, right ear
- H70.002Acute mastoiditis without complications, left ear
- H70.003Acute mastoiditis without complications, bilateral
- H70.009Acute mastoiditis without complications, unspecified ear
ICD-9-CM equivalent
Informational only — GEM mappings are approximate, not guaranteed one-to-one equivalents. Verify before use in billing.
- 38300Approximate match
Associated MS-DRGs
H70.009 can serve as the principal diagnosis for these Medicare Severity Diagnosis-Related Groups.
Informational only — actual DRG assignment also depends on procedures, complications/comorbidities (CC/MCC), discharge status, and payer-specific rules not reflected here.