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ICD-10-CM · FY 2026 APRIL UPDATE

H70

Mastoiditis and related conditions

Diagnosis reference

Nonbillable category

This entry is a category or subcategory. Choose the appropriate billable descendant based on the clinical documentation.

Effective periodOctober 1, 2026–September 30, 2027
SourceCMS ICD-10-CM order file
ClassificationDiagnosis · clinical modification

Related entries

Up to 30 descendants in this category

CODEDESCRIPTIONTYPE
H70.0Acute mastoiditisCategory
H70.00Acute mastoiditis without complicationsCategory
H70.001Acute mastoiditis without complications, right earBillable
H70.002Acute mastoiditis without complications, left earBillable
H70.003Acute mastoiditis without complications, bilateralBillable
H70.009Acute mastoiditis without complications, unspecified earBillable
H70.01Subperiosteal abscess of mastoidCategory
H70.011Subperiosteal abscess of mastoid, right earBillable
H70.012Subperiosteal abscess of mastoid, left earBillable
H70.013Subperiosteal abscess of mastoid, bilateralBillable
H70.019Subperiosteal abscess of mastoid, unspecified earBillable
H70.09Acute mastoiditis with other complicationsCategory
H70.091Acute mastoiditis with other complications, right earBillable
H70.092Acute mastoiditis with other complications, left earBillable
H70.093Acute mastoiditis with other complications, bilateralBillable
H70.099Acute mastoiditis with other complications, unspecified earBillable
H70.1Chronic mastoiditisCategory
H70.10Chronic mastoiditis, unspecified earBillable
H70.11Chronic mastoiditis, right earBillable
H70.12Chronic mastoiditis, left earBillable
H70.13Chronic mastoiditis, bilateralBillable
H70.2PetrositisCategory
H70.20Unspecified petrositisCategory
H70.201Unspecified petrositis, right earBillable
H70.202Unspecified petrositis, left earBillable
H70.203Unspecified petrositis, bilateralBillable
H70.209Unspecified petrositis, unspecified earBillable
H70.21Acute petrositisCategory
H70.211Acute petrositis, right earBillable
H70.212Acute petrositis, left earBillable

Use the complete reference

This reference does not reproduce the full tabular hierarchy, inclusion notes, Excludes1/2 notes, sequencing instructions, or seventh-character rules. Review the official tables and coding guidelines.

Open official CMS files

ICD-10-CM codes describe diagnoses. They do not have an independent Medicare PFS reimbursement amount, and billability alone does not establish coverage.