2026 ICD-10-CM Diagnosis Code J35.1Hypertrophy of tonsils
ICD-10-CM Codes›J00–J99›J30-J39›J35
- Billable — Valid for Submission
- Chronic Condition
J35.1 is a billable ICD-10-CM diagnosis code for hypertrophy of tonsils. It is valid on HIPAA claims for fiscal year 2026 (October 1, 2025 through September 30, 2026) and groups to MS-DRG 154 through 156. In AHRQ's Clinical Classifications Software (CCSR), this diagnosis falls under Acute and chronic tonsillitis.
Code Identity
Code Classification
Approximate SynonymsGuidance
Alternate terms and clinical phrases that map to this code.
- Enlarged tonsil
- Enlargement of left tonsil
- Enlargement of right tonsil
- Finding of size of tonsil
- Hyperplasia of tonsils
- Hypertrophy of tonsils
- Large tonsils
Tabular List NotesGuidance
Coding notes and annotation back-references applicable to this code.
Inclusion Terms
- Enlargement of tonsils
Type 1 Excludes
- hypertrophy of tonsils with tonsillitis J35.0
These terms are the conditions for which that code is to be used. The terms may be synonyms of the code title, or, in the case of "other specified" codes, the terms are a list of the various conditions assigned to that code. The inclusion terms are not necessarily exhaustive. Additional terms found only in the Alphabetic Index may also be assigned to a code.
A type 1 excludes note is a pure excludes note. It means "NOT CODED HERE!" An Excludes1 note indicates that the code excluded should never be used at the same time as the code above the Excludes1 note. An Excludes1 is used when two conditions cannot occur together, such as a congenital form versus an acquired form of the same condition.
Index to Diseases and InjuriesGuidance
Alphabetical index entries that point to this code.
- Enlargement, enlarged - See Also: Hypertrophy;
- tonsils - J35.1
External Cause of Injuries IndexGuidance
References for this code in the External Cause of Injuries Index.
- Enlargement, enlarged
- tonsils
- Hyperplasia, hyperplastic
- tonsils (faucial) (infective) (lingual) (lymphoid)
- Hypertrophy, hypertrophic
- lingual tonsil (infective)
- Hypertrophy, hypertrophic
- tonsils (faucial) (infective) (lingual) (lymphoid)
Clinical ClassificationClinical
AHRQ’s CCSR groups this code into broader clinical categories.
Convert J35.1 to ICD-9-CMHistory
The closest ICD-9-CM equivalents under the General Equivalence Mappings.
Code HistoryHistory
Questions About J35.1Overview
Is J35.1 (Chronic diseases of tonsils and adenoids) a billable code?
Yes. This is a billable ICD-10-CM code, specific enough to report hypertrophy of tonsils on HIPAA-covered claims from October 1, 2025 through September 30, 2026.
What MS-DRG does J35.1 group to?
When hypertrophy of tonsils is the principal diagnosis on an inpatient stay, it groups to MS-DRG 154, 155, 156, with relative weights from 0.6911 to 1.5635 depending on complications. Higher weights mean higher Medicare reimbursement.
What is the ICD-9 equivalent of J35.1?
Under the General Equivalence Mappings, hypertrophy of tonsils converts to ICD-9-CM 474.11 (hypertrophy tonsils). The mapping is a direct match.
Footnotes
[1] Chronic - a chronic condition code indicates a condition lasting 12 months or longer and its effect on the patient based on one or both of the following criteria:
- The condition results in the need for ongoing intervention with medical products,treatment, services, and special equipment
- The condition places limitations on self-care, independent living, and social interactions.
