ICD-10-CM > J00-J99 > J00-J06 > J03 > J03.9 J03.9 Acute tonsillitis, unspecified Non-Billable/Non-Specific Applicable To Follicular tonsillitis (acute)Gangrenous tonsillitis (acute)Infective tonsillitis (acute)Tonsillitis (acute) NOSUlcerative tonsillitis (acute) Type 1 Excludes influenza virus with other respiratory manifestations (J09.X2, J10.1, J11.1) Codes J03.90Acute tonsillitis, unspecifiedJ03.91Acute recurrent tonsillitis, unspecified