1. Home
  2. ICD-10-CM Codes List
  3. H60–H95
  4. H65-H75
  5. Mastoiditis and related conditions (H70)

Mastoiditis and related conditions (H70)

ICD-10 code H70 covers mastoiditis and related conditions affecting the mastoid bone located behind the ear. These include both acute and chronic infections, complications like abscesses, and inflammation of nearby structures such as the petrous part of the temporal bone.

This section details specific codes like H70.001 for acute mastoiditis of the right ear, often known as "acute right mastoiditis," helping clinicians precisely document the ear affected. Codes such as H70.011 refer to a subperiosteal abscess of the mastoid, a pus-filled infection beneath the bone’s surface, with laterality specified for accurate reporting. Chronic conditions, including "chronic suppurative mastoiditis" coded under H70.10, address long-term infections and inflammation. The code range also includes petrositis (H70.2), inflammation of the petrous temporal bone, and other complications like postauricular fistula (H70.81). Use of these codes enables detailed classification by ear side and complication presence, vital for billing and treatment tracking when coding for mastoid infections and related disorders.

  • Diseases of the ear and mastoid process (H60–H95)

    • Diseases of middle ear and mastoid (H65-H75)

        • Mastoiditis and related conditions (H70)

        • H70 Mastoiditis and related conditions
        • H70.0 Acute mastoiditis
        • H70.00 Acute mastoiditis without complications
        • H70.001 Acute mastoiditis without complications, right ear
        • H70.002 Acute mastoiditis without complications, left ear
        • H70.003 Acute mastoiditis without complications, bilateral
        • H70.009 Acute mastoiditis without complications, unspecified ear
        • H70.01 Subperiosteal abscess of mastoid
        • H70.011 Subperiosteal abscess of mastoid, right ear
        • H70.012 Subperiosteal abscess of mastoid, left ear
        • H70.013 Subperiosteal abscess of mastoid, bilateral
        • H70.019 Subperiosteal abscess of mastoid, unspecified ear
        • H70.09 Acute mastoiditis with other complications
        • H70.091 Acute mastoiditis with other complications, right ear
        • H70.092 Acute mastoiditis with other complications, left ear
        • H70.093 Acute mastoiditis with other complications, bilateral
        • H70.099 Acute mastoiditis with other complications, unspecified ear
        • H70.1 Chronic mastoiditis
        • H70.10 Chronic mastoiditis, unspecified ear
        • H70.11 Chronic mastoiditis, right ear
        • H70.12 Chronic mastoiditis, left ear
        • H70.13 Chronic mastoiditis, bilateral
        • H70.2 Petrositis
        • H70.20 Unspecified petrositis
        • H70.201 Unspecified petrositis, right ear
        • H70.202 Unspecified petrositis, left ear
        • H70.203 Unspecified petrositis, bilateral
        • H70.209 Unspecified petrositis, unspecified ear
        • H70.21 Acute petrositis
        • H70.211 Acute petrositis, right ear
        • H70.212 Acute petrositis, left ear
        • H70.213 Acute petrositis, bilateral
        • H70.219 Acute petrositis, unspecified ear
        • H70.22 Chronic petrositis
        • H70.221 Chronic petrositis, right ear
        • H70.222 Chronic petrositis, left ear
        • H70.223 Chronic petrositis, bilateral
        • H70.229 Chronic petrositis, unspecified ear
        • H70.8 Other mastoiditis and related conditions
        • H70.81 Postauricular fistula
        • H70.811 Postauricular fistula, right ear
        • H70.812 Postauricular fistula, left ear
        • H70.813 Postauricular fistula, bilateral
        • H70.819 Postauricular fistula, unspecified ear
        • H70.89 Other mastoiditis and related conditions
        • H70.891 Other mastoiditis and related conditions, right ear
        • H70.892 Other mastoiditis and related conditions, left ear
        • H70.893 Other mastoiditis and related conditions, bilateral
        • H70.899 Other mastoiditis and related conditions, unspecified ear
        • H70.9 Unspecified mastoiditis
        • H70.90 Unspecified mastoiditis, unspecified ear
        • H70.91 Unspecified mastoiditis, right ear
        • H70.92 Unspecified mastoiditis, left ear
        • H70.93 Unspecified mastoiditis, bilateral

Clinical Terms

The following clinical terms provide additional context, helping users better understand the clinical background and common associations for each diagnosis listed in this section. Including related terms alongside ICD-10-CM codes supports coders, billers, and healthcare professionals in improving accuracy, enhancing documentation, and facilitating research or patient education.

Mastoiditis

Inflammation of the honeycomb-like MASTOID BONE in the skull just behind the ear. It is usually a complication of OTITIS MEDIA.

Petrositis

Inflammation of PETROUS BONE.

Petrous Bone

The dense rock-like part of temporal bone that contains the INNER EAR. Petrous bone is located at the base of the skull. Sometimes it is combined with the MASTOID PROCESS and called petromastoid part of temporal bone.