All ICD10 Codes

E21

Non-Billable
ChapterE00–E89
Rankcategory
Official Description

Hyperparathyroidism and other disorders of parathyroid gland

Use a more specific code (6 billable)
E21.0Primary hyperparathyroidismE21.1Secondary hyperparathyroidism, not elsewhere classifiedE21.2Other hyperparathyroidismE21.3Hyperparathyroidism, unspecifiedE21.4Other specified disorders of parathyroid glandE21.5Disorder of parathyroid gland, unspecified
Metadata & Insights
  • •Non-billable category (requires more specific sub-code).
  • •Chapter 4: Endocrine, Nutritional and Metabolic Diseases (E00-E89).

CH4 Parent Instructions

Excludes1(Not coded here. Use a different code.)
  • transitory endocrine and metabolic disorders specific to newborn (P70-P74)

E20-E35 Parent Instructions

Excludes1(Not coded here. Use a different code.)

Instructional Notes

Excludes1(Not coded here. Use a different code.)
  • adult osteomalacia (M83.-)
  • ectopic hyperparathyroidism (E34.2)
  • hungry bone syndrome (E83.81)
  • infantile and juvenile osteomalacia (E55.0)
Excludes2(Not included here. Code separately if applicable.)
  • familial hypocalciuric hypercalcemia (E83.52)

Clinical Hierarchy

BillableHas subcodes
CH4Endocrine, nutritional and metabolic diseases (E00-E89)
E20-E35Disorders of other endocrine glands (E20-E35)
E21Hyperparathyroidism and other disorders of parathyroid glandNot billable
E21.0Primary hyperparathyroidismBillable
E21.1Secondary hyperparathyroidism, not elsewhere classifiedBillable
E21.2Other hyperparathyroidismBillable
E21.3Hyperparathyroidism, unspecifiedBillable
E21.4Other specified disorders of parathyroid glandBillable
E21.5Disorder of parathyroid gland, unspecifiedBillable

Applicable Ancestor Context

The following parent sections contain instructions or notes that apply to E21:

blockE20-E35
Disorders of other endocrine glands (E20-E35)
View context instructions
chapterCH4
Endocrine, nutritional and metabolic diseases (E00-E89)
View context instructions

MS-DRG Classification

2026

No direct MS-DRG triggers identified.

Cross Reference

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