J35.0Chronic tonsillitis and adenoiditis

J35.0 is the ICD-10-CM diagnosis code for chronic tonsillitis and adenoiditis. It belongs to category J35 (chronic diseases of tonsils and adenoids), block J30-J39 (other diseases of upper respiratory tract) and chapter 10 (diseases of the respiratory system). It is a header code, so it can't be reported by itself; one of its 3 subcodes must be used instead.

Within J35 (chronic diseases of tonsils and adenoids), J35.0 is specifically for chronic tonsillitis and adenoiditis. Related codes cover hypertrophy of tonsils (J35.1), hypertrophy of adenoids (J35.2), hypertrophy of tonsils with hypertrophy of adenoids (J35.3), other chronic diseases of tonsils and adenoids (J35.8) and chronic disease of tonsils and adenoids, unspecified (J35.9).

To report this condition, pick the subcode that matches the documentation: J35.01 (tonsillitis), J35.02 (adenoiditis) and J35.03 (adenoiditis).

The conditions in its Excludes2 note aren't part of J35.0, but may be coded alongside it if the patient has both: acute tonsillitis (J03.-).

It has been part of ICD-10-CM since the code set took effect on October 1, 2015 and hasn't changed since.