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E21.1

✓ Billable

Secondary hyperparathyroidism, not elsewhere classified

Endocrine, nutritional and metabolic diseases (E00-E89)

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❌ Excludes1

direct

Cannot be coded with E21.1

  • • secondary hyperparathyroidism of renal origin (N25.81)

❌ Excludes1

inherited from E21

Rules from parent category E21: Hyperparathyroidism and other disorders of parathyroid gland

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

⚠️ Excludes2

inherited from E21

Rules from parent category E21: Hyperparathyroidism and other disorders of parathyroid gland

  • • familial hypocalciuric hypercalcemia (E83.52)

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Code Information

CodeE21.1
BillableYes
ParentE21
CategoryEndocrine, nutritional and metabolic diseases (E00-E89)
Excludes15 rule(s)
Excludes21 note(s)

Data Source

CMS ICD-10-CM 2026 Tabular List

Updated October 1, 2025 (FY2026)