E21 Hyperparathyroidism and other disorders of parathyroid gland

⚠ Non-Billable ICD-10-CM 2026
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The ICD-10-CM code for Hyperparathyroidism and other disorders of parathyroid gland is E21 (FY2026). It is a non-billable category code — select a more specific code below for claims.

Classification

Section
E20-E35: Disorders of other endocrine glands (E20-E35)
Category E21
7 codes (6 billable)
FY2026 Status
Stable since FY2024
Excludes1
Not coded here. These conditions should NOT be coded together with E21.
  • adult osteomalacia (M83.-)
  • ectopic hyperparathyroidism (E34.2)
  • hungry bone syndrome (E83.81)
  • infantile and juvenile osteomalacia (E55.0)
Excludes2
Not included here. These conditions are coded elsewhere but may be coded together if applicable.
  • familial hypocalciuric hypercalcemia (E83.52)

Official Coding Guidelines

Diabetes mellitus (TOC entry)

a. Diabetes mellitus ................................................................................................................... 39

— ICD-10-CM Official Guidelines for Coding and Reporting, FY2026, Section I.C.4.a
Obesity (TOC entry)

b. Obesity .................................................................................................................................. 42

— ICD-10-CM Official Guidelines for Coding and Reporting, FY2026, Section I.C.4.b

Source: CMS — ICD-10-CM Official Guidelines for Coding and Reporting, FY2026

References

Cite This Page

Reference E21 with the canonical source and edition:

E21 — Hyperparathyroidism and other disorders of parathyroid gland. ICD-10 Coding Pro (ICD-10-CM FY2026). https://icd10codingpro.com/codes/E21

Canonical URL: https://icd10codingpro.com/codes/E21

Related Codes

More Specific Codes

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

All Codes in E21

Every most-specific code under E21 Hyperparathyroidism and other disorders of parathyroid gland (6 codes):

Show the complete E21 code list
E21.0 Primary hyperparathyroidism E21.1 Secondary hyperparathyroidism, not elsewhere classified E21.2 Other hyperparathyroidism E21.3 Hyperparathyroidism, unspecified E21.4 Other specified disorders of parathyroid gland E21.5 Disorder of parathyroid gland, unspecified
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Reviewed by Prajwal Shrestha, CPC, CRC
Certified Professional Coder (CPC) and Certified Risk Adjustment Coder (CRC) · AAPC Member ID 01997614 · About · Editorial policy · Content last reviewed: 2025-10-01

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