H70 – Mastoiditis and related conditions
ICD-10-CM 2027 diagnosis code · Diseases of middle ear and mastoid
ICD-10-CM code
H70
- Code
H70(claims format:H70)- Description
- Mastoiditis and related conditions
- Billable
- No – use a more specific code below
- Valid for
- Dates of service October 1, 2026 – September 30, 2027 (FY2027)
- Chapter
- 8. Diseases of the ear and mastoid process (H60-H95)
- Block
- H65-H75 Diseases of middle ear and mastoid
Billable codes under H70
H70 is a header code and cannot be used on claims. Choose the most specific code:
- H70.0 – Acute mastoiditisHeader (more codes below)
- H70.1 – Chronic mastoiditisHeader (more codes below)
- H70.2 – PetrositisHeader (more codes below)
- H70.8 – Other mastoiditis and related conditionsHeader (more codes below)
- H70.9 – Unspecified mastoiditisHeader (more codes below)
Frequently asked questions
What is ICD-10 code H70?
H70 is the ICD-10-CM code for mastoiditis and related conditions, in the block H65-H75 (Diseases of middle ear and mastoid).
Is H70 a billable code?
No. H70 is a header code with more specific child codes; report one of the billable codes listed above.
Source: CDC/NCHS ICD-10-CM FY2027 code files, tabular list and index. Reference only – code assignment must follow the official ICD-10-CM guidelines and documentation in the medical record.