ICD-10-CM Alphabetic Index · FY 2026 13 Entries
Mastoiditis in the ICD-10-CM Index ICD-10-CM
The main term Mastoiditis (coalescent) (hemorrhagic) (suppurative) carries 13 index entries pointing to 9 ICD-10-CM codes. The default entry is H70.9, the code the bare main term maps to; every indented line below refines the term by site, cause, or type. Verify any candidate code in the Tabular List before using it.
✓ Built from the official CMS FY 2026 index fileEffective Oct 1, 2025 – Sep 30, 2026
13
Index Entries
9
Codes Referenced
H70.9
Default Code
M
Letter
13 of 13 shown
ICD-10-CM
Index Entries Under Mastoiditis 13 entries · 9 codes
Mastoiditis (coalescent) (hemorrhagic) (suppurative) H70.9 Non-billable
acute, subacute H70.00 Non-billable
complicated NEC H70.09 Non-billable
subperiosteal H70.01 Non-billable
chronic (necrotic) (recurrent) H70.1 Non-billable
in (due to)
infectious disease NEC B99 Non-billable
parasitic disease NEC B89
tuberculosis A18.03
petrositis see Petrositis
postauricular fistula see Fistula, postauricular
specified NEC H70.89 Non-billable
tuberculous A18.03
The info icon previews the code's description and billable status; the code link opens its full page with all notations.
Related Index Terms
Source: Centers for Medicare & Medicaid Services, FY 2026 ICD-10-CM Index to Diseases and Injuries release files, effective October 1, 2025 through September 30, 2026.
