1. H70 Mastoiditis and related conditions

    1. H70.0 Acute mastoiditis

      Inclusion term(s):

      • Abscess of mastoid
      • Empyema of mastoid
      1. 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
      2. 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
      3. 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
    2. H70.1 Chronic mastoiditis

      Inclusion term(s):

      • Caries of mastoid
      • Fistula of mastoid
      1. H70.10 Chronic mastoiditis, unspecified ear

      2. H70.11 Chronic mastoiditis, right ear

      3. H70.12 Chronic mastoiditis, left ear

      4. H70.13 Chronic mastoiditis, bilateral

    3. H70.2 Petrositis

      Inclusion term(s):

      • Inflammation of petrous bone
      1. 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
      2. 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
      3. 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
    4. H70.8 Other mastoiditis and related conditions

      1. 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
      2. 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
    5. H70.9 Unspecified mastoiditis

      1. H70.90 Unspecified mastoiditis, unspecified ear

      2. H70.91 Unspecified mastoiditis, right ear

      3. H70.92 Unspecified mastoiditis, left ear

      4. H70.93 Unspecified mastoiditis, bilateral

Abbreviations used here:

NEC Not elsewhere classifiable
This abbreviation in the Tabular List represents “other specified”. When a specific code is not available for a condition, the Tabular List includes an NEC entry under a code to identify the code as the “other specified” code.

NOS Not otherwise specified
This abbreviation is the equivalent of unspecified.