ICD-10-CM > H60-H95 > H65-H75 > H70 > H70.2 H70.2 Petrositis Non-Billable/Non-Specific Applicable To Inflammation of petrous bone Codes H70.20Unspecified petrositisH70.201Unspecified petrositis, right earH70.202Unspecified petrositis, left earH70.203Unspecified petrositis, bilateralH70.209Unspecified petrositis, unspecified earH70.21Acute petrositisH70.211Acute petrositis, right earH70.212Acute petrositis, left earH70.213Acute petrositis, bilateralH70.219Acute petrositis, unspecified earH70.22Chronic petrositisH70.221Chronic petrositis, right earH70.222Chronic petrositis, left earH70.223Chronic petrositis, bilateralH70.229Chronic petrositis, unspecified ear