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E21

Non-billable

Hyperparathyroidism and other disorders of parathyroid gland

E21 is the ICD-10-CM code for Hyperparathyroidism and other disorders of parathyroid gland. It is a non-billable category code — use a more specific child code such as E21.0 for billing.

Status
Header (non-billable)
Chapter
E00-E89
Subcodes
6
Edition
FY2026

E00-E89 Endocrine, nutritional and metabolic diseases

Excludes1 — not coded here

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

Excludes2 — not included here

  • •familial hypocalciuric hypercalcemia (E83.52)

Frequently asked questions

What is ICD-10 code E21?
E21 is the ICD-10-CM code for "Hyperparathyroidism and other disorders of parathyroid gland". It falls under E00-E89 Endocrine, nutritional and metabolic diseases.
Is E21 a billable code?
No — E21 is a non-billable header code. Use a more specific child code (such as E21.0) for billing.
What are the subcodes of E21?
E21 has 6 more specific child codes, including E21.0, E21.1, E21.2.
What is excluded from E21?
Excludes1 (not coded here): adult osteomalacia (M83.-); ectopic hyperparathyroidism (E34.2); hungry bone syndrome (E83.81); infantile and juvenile osteomalacia (E55.0).

Source: CMS ICD-10-CM FY2026. For informational purposes only — not medical advice. See our medical disclaimer.

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