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    OpenPayerBilling CodesDiseases of middle ear and mastoidICD-10-CM h70-mastoiditis-and-related-conditions
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    ICD-10-CM Code For Mastoiditis And Related Conditions: Group Overview

    The International Classification of Diseases, Tenth Revision, Clinical Modification (ICD-10-CM) code group H70 includes acute and chronic mastoiditis, mastoid abscess, and related inflammatory conditions of the mastoid and middle ear that may involve postinfectious or postoperative complications. These ICD-10-CM diagnosis codes are used to document clinical scenarios such as suppurative mastoiditis, mastoiditis with abscess, and sequelae affecting the temporal bone, capturing disease severity, extent of infection, and presence of complications. Accurate coding within the ICD-10-CM H70 group supports proper claim adjudication, complete clinical documentation, and appropriate reimbursement.

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    ICD-10-CM H70: Mastoiditis And Related Conditions Overview

    The diagnoses in this group represent infections and inflammatory conditions of the mastoid process and adjacent middle ear structures. These conditions affect the temporal bone and middle ear, frequently arising as complications of acute otitis media. Accurate coding matters for proper clinical documentation and influences reimbursement and utilization review.

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    When to Use

    Use a code from this group when a patient has a documented diagnosis of mastoiditis, mastoid abscess, or related inflammatory complication of the mastoid or adjacent middle ear structures. Select the specific code that reflects acuity, laterality, presence of abscess, and any sequelae or postoperative status as documented in the medical record.

    ICD-10-CM Codes

    40 rows

    ICD-10-CM CodeDescription
    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
    H70.011Subperiosteal abscess of mastoid, right ear
    H70.012Subperiosteal abscess of mastoid, left ear
    H70.013Subperiosteal abscess of mastoid, bilateral
    H70.019Subperiosteal abscess of mastoid, unspecified ear
    H70.091Acute mastoiditis with other complications, right ear
    H70.092Acute mastoiditis with other complications, left ear
    H70.093Acute mastoiditis with other complications, bilateral
    H70.099Acute mastoiditis with other complications, unspecified ear
    H70.10Chronic mastoiditis, unspecified ear
    H70.11Chronic mastoiditis, right ear
    H70.12Chronic mastoiditis, left ear
    H70.13Chronic mastoiditis, bilateral
    H70.201Unspecified petrositis, right ear
    H70.202Unspecified petrositis, left ear
    H70.203Unspecified petrositis, bilateral
    H70.209Unspecified petrositis, unspecified ear

    Showing 1–20 of 40

    DRG Codes

    7 rows

    DRG CodeDescription
    152Otitis Media and URI with MCC
    153Otitis Media and URI without MCC
    154Other Ear, Nose, Mouth and Throat Diagnoses with MCC
    155Other Ear, Nose, Mouth and Throat Diagnoses with CC
    156Other Ear, Nose, Mouth and Throat Diagnoses without CC/MCC
    791Prematurity with Major Problems
    793Full Term Neonate with Major Problems

    Typical Clinical Scenarios

    • A child presents to the emergency department with high fever, severe ear pain, erythema and swelling behind the auricle, and a fluctuant, tender mastoid area following several days of acute otitis media. The clinician documents acute mastoiditis with signs of subperiosteal abscess and initiates urgent management for an acute suppurative infection; a code from this group is assigned to capture the acute mastoid infection and laterality if specified. Typical codes: H70.011, H70.012
    • An adult with a history of recurrent middle ear infections reports months of intermittent ear drainage, hearing loss, and persistent granulation tissue in the mastoid region despite medical therapy; otologic exam and imaging show chronic mastoiditis without acute abscess. The diagnosis reflects a chronic inflammatory process of the mastoid related to chronic otitis media and is coded to indicate chronic mastoid disease and laterality. Typical codes: H70.10, H70.11
    • A patient hospitalized for intracranial complications after acute ear infection develops septic thrombophlebitis or intracranial abscess traced to mastoid infection; the mastoid disease is coded as the related infectious source and its acuity/laterality documented to support the complication linkage. Typical codes: H70.221, H70.222

    Related Codes

    H65-NONSUPPURATIVE-OTITIS-MEDIA

    ICD-10-CM Code For Nonsuppurative Otitis Media: Group Overview

    H66-SUPPURATIVE-AND-UNSPECIFIED-OTITIS-MEDIA

    ICD-10-CM Code For Suppurative And Unspecified Otitis Media: Group Overview

    H67-OTITIS-MEDIA-IN-DISEASES-CLASSIFIED-ELSEWHERE

    ICD-10-CM Code For Otitis Media In Diseases Classified Elsewhere: Group Overview

    H68-EUSTACHIAN-SALPINGITIS-AND-OBSTRUCTION

    ICD-10-CM Code For Eustachian Salpingitis And Obstruction: Group Overview

    H69-OTHER-AND-UNSPECIFIED-EUSTACHIAN-TUBE

    ICD-10-CM Code For Other And Unspecified Disorders Of Eustachian Tube: Group Overview

    H71-CHOLESTEATOMA-OF-MIDDLE-EAR

    ICD-10-CM Code For Cholesteatoma Of Middle Ear: Group Overview

    H72-PERFORATION-OF-TYMPANIC-MEMBRANE

    ICD-10-CM Code For Perforation Of Tympanic Membrane: Group Overview

    H73-OTHER-DISORDERS-OF-TYMPANIC-MEMBRANE

    ICD-10-CM Code For Other Disorders Of Tympanic Membrane: Group Overview

    H74-OTHER-DISORDERS-MIDDLE-EAR-MASTOID

    ICD-10-CM Code For Other Disorders Of Middle Ear Mastoid: Group Overview

    H75-OTHER-MIDDLE-EAR-DISORDERS

    ICD-10-CM Code For Other Disorders Of Middle Ear And Mastoid In Diseases Classified Elsewhere: Group Overview

    Frequently Asked Questions

    References

    1. 1.CPT® Codes and Descriptions. AAPC. Retrieved Aug 11, 2026.Maintains the CPT code set's official descriptions and guidelines, licensed from the American Medical Association, used as the definitional source for CPT codes on this page.
    2. 2.HCPCS Quarterly Update. Centers for Medicare & Medicaid Services (CMS). Retrieved Aug 11, 2026.CMS's quarterly release of HCPCS Level II codes and short/long descriptors, the source for HCPCS code definitions and update history.
    3. 3.ICD-10-CM Full Code List. Centers for Medicare & Medicaid Services (CMS). Retrieved Aug 11, 2026.CMS's complete ICD-10-CM diagnosis code list, used to cross-reference diagnosis codes associated with this procedure or service.
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