H70.0
Acute mastoiditis
Non-billable headerNot valid on its own. Use one of the more specific codes under it.
H70.0 is a non-billable ICD-10-CM code header for acute mastoiditis. Report a more specific code from it instead. It is part of the FY2027 code set, effective October 1, 2026. The more specific codes under it are H70.00 Acute mastoiditis without complications, H70.01 Subperiosteal abscess of mastoid and H70.09 Acute mastoiditis with other complications. Its coding notes include 8 Excludes2 entries.
Excludes2
Not included here. Both codes may be reported if the patient has both conditions.
Also from chapter/block level (8 notes)
Inherited from Chapter 8 Diseases of the ear and mastoid process
- certain conditions originating in the perinatal period (P04-P96)
- certain infectious and parasitic diseases (A00-B99)
- complications of pregnancy, childbirth and the puerperium (O00-O9A)
- congenital malformations, deformations and chromosomal abnormalities (Q00-Q99)
- endocrine, nutritional and metabolic diseases (E00-E88)
- injury, poisoning and certain other consequences of external causes (S00-T88)
- neoplasms (C00-D49)
- symptoms, signs and abnormal clinical and laboratory findings, not elsewhere classified (R00-R94)
Inclusion terms
Conditions classified to this code.
This code
- Abscess of mastoid
- Empyema of mastoid
Notes
Also from chapter/block level (1 note)
Inherited from Chapter 8 Diseases of the ear and mastoid process
- Use an external cause code following the code for the ear condition, if applicable, to identify the cause of the ear condition