2026 ICD-10-CM Diagnosis Code H70Mastoiditis and related conditions

ICD-10-CM Codes›H60–H95›H65-H75›H70

ICD-10-CM H70
CMSSource: CMS FY 2026 ICD-10-CM dataset · Effective Oct 1, 2025 – Sep 30, 2026

H70 is a non-billable ICD-10-CM category code for mastoiditis and related conditions, so it cannot be submitted on claims. Use a more specific code from this category instead, such as H70.001, H70.002, H70.003, and H70.009.

Code Identity

ICD-10-CM Code
H70
Billable Status
No — Non-Billable Category
Code Describes
Mastoiditis and related conditions
Chapter
H65-H75
Diseases of middle ear and mastoid

Code Classification

ChapterH60–H95Diseases of the ear and mastoid process
SectionH65-H75Diseases of middle ear and mastoid
CategoryH70Mastoiditis and related conditions
This CodeH70Mastoiditis and related conditions

Specific Coding for Mastoiditis and related conditionsOverview

Non-specific codes like H70 require more characters. Use one of these billable codes instead:

  • H70.0 for Acute mastoiditis

  • H70.00 for Acute mastoiditis without complications

  • H70.01 for Subperiosteal abscess of mastoid

  • H70.09 for Acute mastoiditis with other complications

  • H70.1 for Chronic mastoiditis

  • Use H70.10 for Chronic mastoiditis, unspecified ear

  • Use H70.11 for Chronic mastoiditis, right ear

  • Use H70.12 for Chronic mastoiditis, left ear

  • Use H70.13 for Chronic mastoiditis, bilateral

  • H70.2 for Petrositis

  • H70.20 for Unspecified petrositis

  • H70.21 for Acute petrositis

  • H70.22 for Chronic petrositis

  • H70.8 for Other mastoiditis and related conditions

  • H70.81 for Postauricular fistula

  • H70.89 for Other mastoiditis and related conditions

  • H70.9 for Unspecified mastoiditis

  • Use H70.90 for Unspecified mastoiditis, unspecified ear

  • Use H70.91 for Unspecified mastoiditis, right ear

  • Use H70.92 for Unspecified mastoiditis, left ear

  • Use H70.93 for Unspecified mastoiditis, bilateral

Patient EducationClinical

Ear Infections

Ear infections are the most common reason parents bring their child to a doctor. Three out of four children will have at least one ear infection by their third birthday. Adults can also get ear infections, but they are less common.

Read the full article at MedlinePlus

Courtesy of MedlinePlus, a service of the U.S. National Library of Medicine.

Code HistoryHistory

FY 2016AddedAdded to the ICD-10-CM code setEffective October 1, 2015, the first year of ICD-10-CM.
FY 2017–2025No changes
FY 2026CurrentCurrent code set, no changesEffective October 1, 2025 through September 30, 2026.

Questions About H70Overview

Is H70 (Mastoiditis and related conditions) a billable code?

No. This is a category header that groups the codes for mastoiditis and related conditions, and headers cannot be submitted on claims. Claims for mastoiditis and related conditions need a more specific code from this category, such as H70.001, H70.002, and H70.003.