E21 ICD-10-CA category: Hyperparathyroidism and other disorders of parathyroid gland
E21 isn’t a code on its own. Choose one of the 6 codes beneath it, the one the documentation supports.
Official description
E21Hyperparathyroidism and other disorders of parathyroid gland
ICD-10-CA · Canada
Codes in E21
E21 isn’t a code on its own. Open the code that matches what the note documents.
Notes for E21
As CIHI prints them, with any note E21 takes from the headings above it.
Excludes
Conditions classified elsewhere.
- Osteomalacia:• adult (M83.-)• infantile and juvenile (E55.0)
- Galactorrhoea (N64.3)gynaecomastia (N62)From E20-E35 Disorders of other endocrine glands
- Complications of pregnancy, childbirth and the puerperium (O00-O99)symptoms, signs and abnormal clinical and laboratory findings, not elsewhere classified (R00-R99)transitory endocrine and metabolic disorders specific to fetus and newborn (P70-P74)From Chapter 4: Endocrine, nutritional and metabolic diseases (E00-E90)
Note
- All neoplasms, whether functionally active or not, are classified in Chapter II. Appropriate codes in this chapter (i.e. E05.8)(E07.0) (E16-E31)(E34.-) may be used, if desired, as additional codes to indicate either functional activity by neoplasms and ectopic endocrine tissue or hyperfunction and hypofunction of endocrine glands associated with neoplasms and other conditions classified elsewhere.From Chapter 4: Endocrine, nutritional and metabolic diseases (E00-E90)
Where E21 sits
- 1ChapterChapter 4: Endocrine, nutritional and metabolic diseases (E00-E90)
- 2Block E20-E35Disorders of other endocrine glands
- 3Category E21Hyperparathyroidism and other disorders of parathyroid gland
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
Is E21 a valid ICD-10-CA code?
No. E21 (Hyperparathyroidism and other disorders of parathyroid gland) is a category heading in CIHI’s ICD-10-CA FY 2026–2027 release. It holds 6 codes; record the one the documentation supports.
Where is E21 in ICD-10-CA?
E21 sits under E20-E35 Disorders of other endocrine glands, within Chapter 4: Endocrine, nutritional and metabolic diseases (E00-E90).
What coding notes apply to E21?
ICD-10-CA lists Excludes, Note notes for E21, 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.
Codes beside E21
View E20-E35E20HypoparathyroidismE22Hyperfunction of pituitary glandE23Hypofunction and other disorders of pituitary glandE24Cushing's syndromeE25Adrenogenital disordersE26HyperaldosteronismE27Other disorders of adrenal glandE28Ovarian dysfunctionE29Testicular dysfunctionE30Disorders of puberty, not elsewhere classifiedE31Polyglandular dysfunctionE32Diseases of thymusE34Other endocrine disordersE35Disorders of endocrine glands in diseases classified elsewhere