E21.1Billable

Secondary hyperparathyroidism, not elsewhere classified

Chapter
4. Endocrine, nutritional and metabolic diseases
Category
E21
Effective date
October 1, 2026

Related codes in category E21

E21Hyperparathyroidism and other disorders of parathyroid glandE21.0Primary hyperparathyroidismYesE21.2Other hyperparathyroidismYesE21.3Hyperparathyroidism, unspecifiedYesE21.4Other specified disorders of parathyroid glandYesE21.5Disorder of parathyroid gland, unspecifiedYes

Frequently asked questions

What is ICD-10 code E21.1?

E21.1 is an ICD-10-CM diagnosis code for Secondary hyperparathyroidism, not elsewhere classified.

Is E21.1 a billable code?

Yes. E21.1 is billable and specific enough to be used on a claim.

What ICD-10-CM chapter is E21.1 in?

E21.1 falls under Chapter 4: Endocrine, nutritional and metabolic diseases.

When did E21.1 become effective?

E21.1 has been effective since October 1, 2026, per the CMS/CDC ICD-10-CM annual release.

What other codes are related to E21.1?

E21.1 belongs to category E21, which includes 6 other codes — see the related codes list on this page.

ICD-10-CM data maintained by CDC/CMS (public domain). Always verify codes with authoritative sources before making coding or billing decisions.