H70.0 – Acute mastoiditis
ICD-10-CM 2027 diagnosis code · Diseases of middle ear and mastoid
ICD-10-CM code
H70.0
- Code
H70.0(claims format:H700)- Description
- Acute mastoiditis
- 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
- Parent codes
- H70
Billable codes under H70.0
H70.0 is a header code and cannot be used on claims. Choose the most specific code:
- H70.00 – Acute mastoiditis without complicationsHeader (more codes below)
- H70.01 – Subperiosteal abscess of mastoidHeader (more codes below)
- H70.09 – Acute mastoiditis with other complicationsHeader (more codes below)
Notes for H70.0
Applicable to:
- Abscess of mastoid
- Empyema of mastoid
Related codes in H70
Frequently asked questions
What is ICD-10 code H70.0?
H70.0 is the ICD-10-CM code for acute mastoiditis, in the block H65-H75 (Diseases of middle ear and mastoid).
Is H70.0 a billable code?
No. H70.0 is a header code with more specific child codes; report one of the billable codes listed above.
What category does H70.0 belong to?
It belongs to category H70 – Mastoiditis and related conditions.
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.