| H6993 | Unspecified Eustachian tube disorder, bilateral |
| H70 | Mastoiditis and related conditions |
| H700 | Acute mastoiditis |
| H7000 | Acute mastoiditis without complications |
| H70001 | Acute mastoiditis without complications, right ear |
| H70002 | Acute mastoiditis without complications, left ear |
| H70003 | Acute mastoiditis without complications, bilateral |
| H70009 | Acute mastoiditis without complications, unspecified ear |
| H7001 | Subperiosteal abscess of mastoid |
| H70011 | Subperiosteal abscess of mastoid, right ear |
| H70012 | Subperiosteal abscess of mastoid, left ear |
| H70013 | Subperiosteal abscess of mastoid, bilateral |
| H70019 | Subperiosteal abscess of mastoid, unspecified ear |
| H7009 | Acute mastoiditis with other complications |
| H70091 | Acute mastoiditis with other complications, right ear |
| H70092 | Acute mastoiditis with other complications, left ear |
| H70093 | Acute mastoiditis with other complications, bilateral |
| H70099 | Acute mastoiditis with other complications, unspecified ear |
| H701 | Chronic mastoiditis |
| H7010 | Chronic mastoiditis, unspecified ear |
| H7011 | Chronic mastoiditis, right ear |
| H7012 | Chronic mastoiditis, left ear |
| H7013 | Chronic mastoiditis, bilateral |
| H702 | Petrositis |
| H7020 | Unspecified petrositis |
| H70201 | Unspecified petrositis, right ear |
| H70202 | Unspecified petrositis, left ear |
| H70203 | Unspecified petrositis, bilateral |
| H70209 | Unspecified petrositis, unspecified ear |
| H7021 | Acute petrositis |
| H70211 | Acute petrositis, right ear |
| H70212 | Acute petrositis, left ear |
| H70213 | Acute petrositis, bilateral |
| H70219 | Acute petrositis, unspecified ear |
| H7022 | Chronic petrositis |
| H70221 | Chronic petrositis, right ear |
| H70222 | Chronic petrositis, left ear |
| H70223 | Chronic petrositis, bilateral |
| H70229 | Chronic petrositis, unspecified ear |
| H708 | Other mastoiditis and related conditions |
| H7081 | Postauricular fistula |
| H70811 | Postauricular fistula, right ear |
| H70812 | Postauricular fistula, left ear |
| H70813 | Postauricular fistula, bilateral |
| H70819 | Postauricular fistula, unspecified ear |
| H7089 | Other mastoiditis and related conditions |
| H70891 | Other mastoiditis and related conditions, right ear |
| H70892 | Other mastoiditis and related conditions, left ear |
| H70893 | Other mastoiditis and related conditions, bilateral |
| H70899 | Other mastoiditis and related conditions, unspecified ear |