ICD-10-CM > H60-H95 > H65-H75 > H70 > H70.0 > H70.01 H70.01 Subperiosteal abscess of mastoid Non-Billable/Non-Specific Codes H70.011Subperiosteal abscess of mastoid, right earH70.012Subperiosteal abscess of mastoid, left earH70.013Subperiosteal abscess of mastoid, bilateralH70.019Subperiosteal abscess of mastoid, unspecified ear