Mastoiditis and related conditions (H70) ICD-10-CM
The H70 code range covers mastoiditis and related conditions with 54 ICD-10-CM diagnosis codes. 40 of them are billable and valid for claim submission in fiscal year 2026, and the category headers group them but cannot themselves be billed.
Codes in the H70 Range 54 codes · 40 billable
- H70 Mastoiditis and related conditionsNon-billable
- H70.0 Acute mastoiditisNon-billable
- H70.00 Acute mastoiditis without complicationsNon-billable
- 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 mastoidNon-billable
- 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 complicationsNon-billable
- 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 mastoiditisNon-billable
- 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 PetrositisNon-billable
- H70.20 Unspecified petrositisNon-billable
- 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 petrositisNon-billable
- 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 petrositisNon-billable
- 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 conditionsNon-billable
- H70.81 Postauricular fistulaNon-billable
- 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 conditionsNon-billable
- 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 mastoiditisNon-billable
- 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 in This Code Range
Definitions from the National Library of Medicine for conditions coded in the H70 range.
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.
About the H70 Code Range
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.
Questions About This Page
How many billable codes are in the H70 range?
Of the 54 codes in this range, 40 are billable and valid for claim submission from October 1, 2025 through September 30, 2026. Category header codes group them but cannot be reported on claims.
What does the H70 range classify?
The range classifies mastoiditis and related conditions. Each code links to its own reference page with billing status, MS-DRG grouping, coding notes, and clinical information.
Related References
Source: CMS FY 2026 ICD-10-CM Tabular List and order file, effective October 1, 2025 through September 30, 2026.
