E21

Hyperparathyroidism and other disorders of parathyroid gland

Diagnosis reference

Nonbillable category

This entry is a category or subcategory. Choose the appropriate billable descendant based on the clinical documentation.

Effective periodOctober 1, 2026–September 30, 2027

SourceCMS ICD-10-CM order file

ClassificationDiagnosis · clinical modification

Related entries

Up to 30 descendants in this category

CODE	DESCRIPTION	TYPE
E21.0	Primary hyperparathyroidism	Billable
E21.1	Secondary hyperparathyroidism, not elsewhere classified	Billable
E21.2	Other hyperparathyroidism	Billable
E21.3	Hyperparathyroidism, unspecified	Billable
E21.4	Other specified disorders of parathyroid gland	Billable
E21.5	Disorder of parathyroid gland, unspecified	Billable

Use the complete reference

This reference does not reproduce the full tabular hierarchy, inclusion notes, Excludes1/2 notes, sequencing instructions, or seventh-character rules. Review the official tables and coding guidelines.

Open official CMS files

ICD-10-CM codes describe diagnoses. They do not have an independent Medicare PFS reimbursement amount, and billability alone does not establish coverage.