ICD-10-CM 2027
ICD-10 code for tonsils enlargement
From the official ICD-10-CM alphabetic index entry “Enlargement, enlarged › tonsils”. Page updated September 29, 2026.
About coding tonsils enlargement
The ICD-10-CM code for tonsils enlargement is J35.1 (Hypertrophy of tonsils). The official index lists 1 more specific code, so check the documentation for details such as type, cause, site or severity before settling on J35.1.
Within J35 (chronic diseases of tonsils and adenoids), J35.1 is specifically for hypertrophy of tonsils. Related codes cover chronic tonsillitis and adenoiditis (J35.0), 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).
Don't report J35.1 together with the conditions in its Excludes1 note: hypertrophy of tonsils with tonsillitis (J35.0-).
It is not a CC or MCC, so as a secondary diagnosis it doesn't change the MS-DRG severity level.
More specific tonsils enlargement codes (official index)
- with adenoids J35.3 — Hypertrophy of tonsils with hypertrophy of adenoids
Don't confuse with (Excludes1 for J35.1)
- hypertrophy of tonsils with tonsillitis (J35.0-)
Common questions about tonsils enlargement ICD-10 codes
What is the ICD-10 code for tonsils enlargement?
- J35.1 — Hypertrophy of tonsils. More specific codes apply when the documentation supports them: J35.3.
Is J35.1 billable?
- Yes. J35.1 is a billable/specific ICD-10-CM code valid for FY2027 (October 1, 2026 – September 30, 2027).
Can J35.1 be used as a principal diagnosis?
- Yes. The Medicare Code Editor doesn't restrict J35.1 as a principal diagnosis.
Is J35.1 a CC or MCC?
- No. J35.1 is neither a CC nor an MCC under MS-DRG v44.0.