H70.1 is the ICD-10 code for Chronic mastoiditis. It is a four-character subcategory of H70 (Mastoiditis and related conditions), the most specific level in the WHO edition. It belongs to the block H65–H75 (Diseases of middle ear and mastoid) in Chapter VIII, Diseases of the ear and mastoid process.
- Code type
- Subcategory (4 characters)
- Chapter
- VIII · H60–H95
- Classification
- WHO ICD-10, 2019 version
What H70.1 includes
Conditions and terms that are coded here.
- Caries
- of mastoid
- Fistula
- of mastoid
H70.1 in national editions
Countries report with their own edition of ICD-10. Most keep the WHO code and add more specific codes beneath it.
H70.1Kronisk mastoidit
H70.1Kronisk mastoiditt
DH701Kronisk mastoiditis
H70.1Pitkäaikainen kartiolisäkkeen tulehdus
H70.1Chronische Mastoiditis
H70.1Mastoïdite chronique
H70.1chronische mastoïditis
Listed through more specific codes:
- H70.10Chronic mastoiditis, unspecified ear
- H70.11Chronic mastoiditis, right ear
- H70.12Chronic mastoiditis, left ear
- H70.13Chronic mastoiditis, bilateral
Based on the World Health Organization’s International Statistical Classification of Diseases and Related Health Problems, 10th revision (ICD-10), 2019 version, and the national editions published by each country’s health authority. This page is a reference, not coding advice; follow your national coding rules when you report.
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