ICD-10-CM category
H70: Mastoiditis and related conditions
Codes under H70 (Mastoiditis and related conditions). A ✓ marks a billable (fully specified) code; category codes without a ✓ are not billable on their own.
| Code | Description | Billable |
|---|---|---|
| H70.0 | Acute mastoiditis | — |
| H70.0 | Acute mastoiditis | — |
| H70.00 | Acute mastoiditis without complications | — |
| H70.00 | Acute mastoiditis without complications | — |
| H70.001 | Acute mastoiditis without complications, right ear | ✓ |
| H70.001 | Acute mastoiditis without complications, right ear | ✓ |
| H70.01 | Subperiosteal abscess of mastoid | — |
| H70.01 | Subperiosteal abscess of mastoid | — |
| H70.1 | Chronic mastoiditis | — |
| H70.1 | Chronic mastoiditis | — |
| H70.002 | Acute mastoiditis without complications, left ear | ✓ |
| H70.002 | Acute mastoiditis without complications, left ear | ✓ |
| H70.2 | Petrositis | — |
| H70.2 | Petrositis | — |
| H70.003 | Acute mastoiditis without complications, bilateral | ✓ |
| H70.003 | Acute mastoiditis without complications, bilateral | ✓ |
| H70.8 | Other mastoiditis and related conditions | — |
| H70.8 | Other mastoiditis and related conditions | — |
| H70.009 | Acute mastoiditis without complications, unspecified ear | ✓ |
| H70.009 | Acute mastoiditis without complications, unspecified ear | ✓ |
| H70.09 | Acute mastoiditis with other complications | — |
| H70.09 | Acute mastoiditis with other complications | — |
| H70.9 | Unspecified mastoiditis | — |
| H70.9 | Unspecified mastoiditis | — |
| H70.10 | Chronic mastoiditis, unspecified ear | ✓ |
| H70.10 | Chronic mastoiditis, unspecified ear | ✓ |
| H70.011 | Subperiosteal abscess of mastoid, right ear | ✓ |
| H70.011 | Subperiosteal abscess of mastoid, right ear | ✓ |
| H70.11 | Chronic mastoiditis, right ear | ✓ |
| H70.11 | Chronic mastoiditis, right ear | ✓ |
| H70.012 | Subperiosteal abscess of mastoid, left ear | ✓ |
| H70.012 | Subperiosteal abscess of mastoid, left ear | ✓ |
| H70.12 | Chronic mastoiditis, left ear | ✓ |
| H70.12 | Chronic mastoiditis, left ear | ✓ |
| H70.013 | Subperiosteal abscess of mastoid, bilateral | ✓ |
| H70.013 | Subperiosteal abscess of mastoid, bilateral | ✓ |
| H70.13 | Chronic mastoiditis, bilateral | ✓ |
| H70.13 | Chronic mastoiditis, bilateral | ✓ |
| H70.019 | Subperiosteal abscess of mastoid, unspecified ear | ✓ |
| H70.019 | Subperiosteal abscess of mastoid, unspecified ear | ✓ |
| H70.20 | Unspecified petrositis | — |
| H70.20 | Unspecified petrositis | — |
| H70.21 | Acute petrositis | — |
| H70.21 | Acute petrositis | — |
| H70.22 | Chronic petrositis | — |
| H70.22 | Chronic petrositis | — |
| H70.81 | Postauricular fistula | — |
| H70.81 | Postauricular fistula | — |
| H70.89 | Other mastoiditis and related conditions | — |
| H70.89 | Other mastoiditis and related conditions | — |
| H70.90 | Unspecified mastoiditis, unspecified ear | ✓ |
| H70.90 | Unspecified mastoiditis, unspecified ear | ✓ |
| H70.091 | Acute mastoiditis with other complications, right ear | ✓ |
| H70.091 | Acute mastoiditis with other complications, right ear | ✓ |
| H70.91 | Unspecified mastoiditis, right ear | ✓ |
| H70.91 | Unspecified mastoiditis, right ear | ✓ |
| H70.092 | Acute mastoiditis with other complications, left ear | ✓ |
| H70.092 | Acute mastoiditis with other complications, left ear | ✓ |
| H70.92 | Unspecified mastoiditis, left ear | ✓ |
| H70.92 | Unspecified mastoiditis, left ear | ✓ |
| H70.093 | Acute mastoiditis with other complications, bilateral | ✓ |
| H70.093 | Acute mastoiditis with other complications, bilateral | ✓ |
| H70.93 | Unspecified mastoiditis, bilateral | ✓ |
| H70.93 | Unspecified mastoiditis, bilateral | ✓ |
| H70.099 | Acute mastoiditis with other complications, unspecified ear | ✓ |
| H70.099 | Acute mastoiditis with other complications, unspecified ear | ✓ |
| H70.201 | Unspecified petrositis, right ear | ✓ |
| H70.201 | Unspecified petrositis, right ear | ✓ |
| H70.202 | Unspecified petrositis, left ear | ✓ |
| H70.202 | Unspecified petrositis, left ear | ✓ |
| H70.203 | Unspecified petrositis, bilateral | ✓ |
| H70.203 | Unspecified petrositis, bilateral | ✓ |
| H70.209 | Unspecified petrositis, unspecified ear | ✓ |
| H70.209 | Unspecified petrositis, unspecified ear | ✓ |
| H70.211 | Acute petrositis, right ear | ✓ |
| H70.211 | Acute petrositis, right ear | ✓ |
| H70.212 | Acute petrositis, left ear | ✓ |
| H70.212 | Acute petrositis, left ear | ✓ |
| H70.213 | Acute petrositis, bilateral | ✓ |
| H70.213 | Acute petrositis, bilateral | ✓ |
| H70.219 | Acute petrositis, unspecified ear | ✓ |
| H70.219 | Acute petrositis, unspecified ear | ✓ |
| H70.221 | Chronic petrositis, right ear | ✓ |
| H70.221 | Chronic petrositis, right ear | ✓ |
| H70.222 | Chronic petrositis, left ear | ✓ |
| H70.222 | Chronic petrositis, left ear | ✓ |
| H70.223 | Chronic petrositis, bilateral | ✓ |
| H70.223 | Chronic petrositis, bilateral | ✓ |
| H70.229 | Chronic petrositis, unspecified ear | ✓ |
| H70.229 | Chronic petrositis, unspecified ear | ✓ |
| H70.811 | Postauricular fistula, right ear | ✓ |
| H70.811 | Postauricular fistula, right ear | ✓ |
| H70.812 | Postauricular fistula, left ear | ✓ |
| H70.812 | Postauricular fistula, left ear | ✓ |
| H70.813 | Postauricular fistula, bilateral | ✓ |
| H70.813 | Postauricular fistula, bilateral | ✓ |
| H70.819 | Postauricular fistula, unspecified ear | ✓ |
| H70.819 | Postauricular fistula, unspecified ear | ✓ |
| H70.891 | Other mastoiditis and related conditions, right ear | ✓ |
| H70.891 | Other mastoiditis and related conditions, right ear | ✓ |
| H70.892 | Other mastoiditis and related conditions, left ear | ✓ |
| H70.892 | Other mastoiditis and related conditions, left ear | ✓ |
| H70.893 | Other mastoiditis and related conditions, bilateral | ✓ |
| H70.893 | Other mastoiditis and related conditions, bilateral | ✓ |
| H70.899 | Other mastoiditis and related conditions, unspecified ear | ✓ |
| H70.899 | Other mastoiditis and related conditions, unspecified ear | ✓ |
Frequently asked questions
What is ICD-10-CM code H70?
H70 is an ICD-10-CM category covering Mastoiditis and related conditions. It contains 106 more specific diagnosis codes, 80 of which are billable.
Is H70 a billable code?
No — H70 is a category header and isn't billable on its own. Code to the highest level of specificity using one of its subcodes (for example H70.0 — Acute mastoiditis). 80 of the 106 codes under H70 are billable.
What codes fall under H70?
H70 includes H70.0, H70.0, H70.00, H70.00, H70.001, plus 101 more. See the full list with descriptions and billable status above.
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Informational only, not coding or medical advice. Verify against the official ICD-10-CM (FY2026) and your payer's guidelines.
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