E05.81 Other thyrotoxicosis with thyrotoxic crisis or storm

The ICD-10-CM code for Other thyrotoxicosis with thyrotoxic crisis or storm is E05.81 (FY2026). It is a billable, claim-ready diagnosis code.

Classification

Chapter

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

Section

E00-E07: Disorders of thyroid gland (E00-E07)

Category E05

22 codes (14 billable)

FY2026 Status

Stable since FY2024

Also Known As

ICD-10-CM Alphabetic Index entries that lead to E05.81:

• Hyperthyroidism (latent) (pre-adult) (recurrent) › specified NEC › with thyroid storm
• Hypersecretion › hormone (s) › thyroid stimulating › with thyroid storm
• Thyrotoxicosis (recurrent) › due to › overproduction of thyroid-stimulating hormone › with thyroid storm
• Thyrotoxicosis (recurrent) › due to › specified cause NEC › with thyroid storm

U.S. Hospital Utilization

• An estimated 235 U.S. inpatient stays in 2023 included E05.81 among the documented diagnoses.
• 115 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)