J35.1 ICD-10-CA code: Hypertrophy of tonsils
J35.1 is the ICD-10-CA code for “Hypertrophy of tonsils” in CIHI’s FY 2026–2027 release, in effect from Apr 1, 2026.
Official description
J35.1Hypertrophy of tonsils
ICD-10-CA · Canada · Also written J351
Index terms
Entries in CIHI’s alphabetical index that lead to J35.1. Searching the index by the condition the note names is how coders reach this code.
- Enlargement, enlarged, tonsils
- Hypertrophy, hypertrophic, lingual tonsil (infective)
- Hyperplasia, hyperplastic, tonsils (faucial) (infective) (lingual) (lymphoid)
- Hypertrophy, hypertrophic, tonsils (faucial) (infective) (lingual) (lymphoid)
Notes for J35.1
As CIHI prints them, with any note J35.1 takes from the headings above it.
Includes
- Enlargement of tonsils
Excludes
Conditions classified elsewhere.
- Certain:• conditions originating in the perinatal period (P00-P96)• infectious and parasitic diseases (A00-B99)complications of pregnancy, childbirth and the puerperium (O00-O99)congenital malformations, deformations and chromosomal abnormalities (Q00-Q99)endocrine, nutritional and metabolic diseases (E00-E90)injury, poisoning and certain other consequences of external causes (S00-T98)neoplasms (C00-D48)symptoms, signs and abnormal clinical and laboratory findings, not elsewhere classified (R00-R99)From Chapter 10: Diseases of the respiratory system (J00-J99)
Note
- When a respiratory condition is described as occurring in more than one site and is not specifically indexed, it should be classified to the lower anatomic site (e.g., tracheobronchitis to bronchitis in J40).From Chapter 10: Diseases of the respiratory system (J00-J99)
Where J35.1 sits
- 1ChapterChapter 10: Diseases of the respiratory system (J00-J99)
- 2Block J30-J39Other diseases of upper respiratory tract
- 3Category J35Chronic diseases of tonsils and adenoids
- 4Valid code J35.1Hypertrophy of tonsils
Source and release
- Data release
- ICD-10-CA · FY 2026–2027
- Effective date
- Apr 1, 2026
- Publisher
- CIHI
This page is built from the ICD-10-CA catalog that Vero Codes reads when it suggests codes: Canadian Institute for Health Information’s FY 2026–2027 release, imported from the publisher’s file and checked against it. The description, notes and structured data come from the same record.
Frequently asked questions
What does ICD-10-CA code J35.1 mean?
J35.1 is the ICD-10-CA code for “Hypertrophy of tonsils” in CIHI’s ICD-10-CA FY 2026–2027 release.
Where is J35.1 in ICD-10-CA?
J35.1 sits under J35 Chronic diseases of tonsils and adenoids, within J30-J39 Other diseases of upper respiratory tract, within Chapter 10: Diseases of the respiratory system (J00-J99).
What coding notes apply to J35.1?
ICD-10-CA lists Includes, Note, Excludes notes for J35.1, including those from the headings it sits under. They are listed on this page with where each one comes from.
Which ICD-10-CA release does this page use?
It uses CIHI’s FY 2026–2027 release, in effect from Apr 1, 2026 to Mar 31, 2027. It is a reference: confirm the code against the current list and the payer’s rules before you submit it.