ICD10Check
CheckerBrowseOpen

E21

⚠ Non-billable (Header)

Hyperparathyroidism and other disorders of parathyroid gland

Endocrine, nutritional and metabolic diseases (E00-E89)

⚠️ This is a category header code — not billable. Use a more specific child code below.

Check This Code

❌ Excludes1

direct

Cannot be coded with E21

  • • adult osteomalacia (M83.-)
  • • ectopic hyperparathyroidism (E34.2)
  • • hungry bone syndrome (E83.81)
  • • infantile and juvenile osteomalacia (E55.0)

⚠️ Excludes2

direct

May be coded together if both conditions coexist

  • • familial hypocalciuric hypercalcemia (E83.52)

Child Codes (6)

E21.0Primary hyperparathyroidismE21.1Secondary hyperparathyroidism, not elsewhere classifiedE21.2Other hyperparathyroidismE21.3Hyperparathyroidism, unspecifiedE21.4Other specified disorders of parathyroid glandE21.5Disorder of parathyroid gland, unspecified

🧪 Validate Combinations

Add E21 to the Excludes Checker to validate against your full code list.

Open in Checker →

Code Information

CodeE21
BillableNo — Header code
CategoryEndocrine, nutritional and metabolic diseases (E00-E89)
Excludes14 rule(s)
Excludes21 note(s)
Child codes6

Data Source

CMS ICD-10-CM 2026 Tabular List

Updated October 1, 2025 (FY2026)