E20.9 Hypoparathyroidism, unspecified

The ICD-10-CM code for Hypoparathyroidism, unspecified is E20.9 (FY2026). It is a billable, claim-ready diagnosis code.

Classification

Chapter

4: Endocrine, nutritional and metabolic diseases (E00-E89)

Section

E20-E35: Disorders of other endocrine glands (E20-E35)

Category E20

12 codes (9 billable)

FY2026 Status

Stable since FY2024

Also Known As

ICD-10-CM Alphabetic Index entries that lead to E20.9:

• Hypoparathyroidism
• Parathyroid tetany
• Deficiency, deficient › parathyroid (gland)
• Tetany (due to) › parathyroid (gland)
• Insufficiency, insufficient › parathyroid (gland)
• Myopathy › in (due to) › hypoparathyroidism
• Cataract (cortical) (immature) (incipient) › in (due to) › hypoparathyroidism

Inclusion Terms

• Parathyroid tetany

U.S. Hospital Utilization

• An estimated 8,080 U.S. inpatient stays in 2023 included E20.9 among the documented diagnoses.
• 395 stays listed it as the principal diagnosis.

Source: National Inpatient Sample (NIS), Healthcare Cost and Utilization Project (HCUP), Agency for Healthcare Research and Quality, 2016–2023. National survey-weighted estimates.

Official Coding Guidelines

Diabetes mellitus (TOC entry)

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

Obesity (TOC entry)

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

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

References

• CMS — ICD-10-CM Official Code Set and Guidelines, FY2026
• CDC/NCHS — ICD-10-CM Files and Browser Tool
• AHRQ — HCUP National Inpatient Sample, Frequencies by Diagnosis Code (2016–2023)