E21.3 ICD-10-CM Code: Hyperparathyroidism, unspecified
E21.3 is the billable ICD-10-CM code for “Hyperparathyroidism, unspecified” in the FY 2027 U.S. code set, effective Oct 1, 2026.
Official description
E21.3Hyperparathyroidism, unspecified
ICD-10-CM diagnosis code · United States clinical modification
More specific than E21.3
View categoryE21.3 is an unspecified code, for when the note doesn’t say more. If it documents the type, cause, or site, one of these codes may fit better.
Where E21.3 sits
- 1
Chapter 4
Endocrine, nutritional and metabolic diseases (E00-E89)
- 2
Section
Disorders of other endocrine glands (E20-E35)
- 3
Category E21
Hyperparathyroidism and other disorders of parathyroid gland
- 4
Code E21.3
Hyperparathyroidism, unspecified
Notes for this code
Inclusion terms
No inclusion terms are listed for E21.3.
Code first
No “code first” instruction is listed for E21.3.
Use additional code
No “use additional code” instruction is listed for E21.3.
Excludes1
Conditions that should not be reported together with this code.
No Excludes1 note is listed for E21.3.
Excludes2
Conditions not included here that may be reported separately when present.
No Excludes2 note is listed for E21.3.
Source and release
- Data release
- U.S. ICD-10-CM · FY 2027
- Effective date
- Oct 1, 2026
- Publisher
- Vero Scribe Inc.
This reference is generated from Vero’s ICD-10-CM description, hierarchy, and code-note dataset. The visible content and structured data share that source.
Frequently asked questions
What does ICD-10-CM code E21.3 mean?
E21.3 is the FY 2027 U.S. ICD-10-CM code for “Hyperparathyroidism, unspecified.”
Is E21.3 a billable or specific ICD-10-CM code?
Yes. In the FY 2027 reference data used on this page, E21.3 has no child codes and is presented as a billable/specific code. Always confirm the active code set and payer requirements before use.
Where is E21.3 located in ICD-10-CM?
E21.3 is listed in Chapter 4, Endocrine, nutritional and metabolic diseases (E00-E89), within Disorders of other endocrine glands (E20-E35) (E20–E35), under category E21, Hyperparathyroidism and other disorders of parathyroid gland.
What coding notes are listed for E21.3?
No inclusion terms are listed for E21.3 in this reference record. No code-first instruction is listed. No Excludes1 note is listed. No Excludes2 note is listed.