H70.2 PetrositisNon-billable header with 3 child codes.
M86 Osteomyelitis ("petrous bone (H70.2-)")H74 Other disorders of middle ear mastoid ("mastoiditis (H70.-)")H70.1 Chronic mastoiditisH70.10 Chronic mastoiditis, unspecified earH70.11 Chronic mastoiditis, right earH70.12 Chronic mastoiditis, left earH70.13 Chronic mastoiditis, bilateralH70.2 Petrositis (this code)H70.20 Unspecified petrositisH70.201 Unspecified petrositis, right earH70.202 Unspecified petrositis, left earH70.203 Unspecified petrositis, bilateralH70.209 Unspecified petrositis, unspecified ear