ICD-10-CM 2027 diagnosis code

E05Thyrotoxicosis [hyperthyroidism]

Not billable — use a more specific code

E05 is a header code, so it can't be reported by itself. Choose one of the 7 more specific codes beneath it.

Code unchanged since ICD-10-CM took effect on October 1, 2015. Source: official FY2027 ICD-10-CM release from CDC/NCHS and CMS. Page updated September 29, 2026. About our data

About E05

E05 is the ICD-10-CM diagnosis code for thyrotoxicosis [hyperthyroidism]. It belongs to block E00-E07 (disorders of thyroid gland) and chapter 4 (endocrine, nutritional and metabolic diseases). It is a header code, so it can't be reported by itself; one of its 7 subcodes must be used instead.

To report this condition, pick the subcode that matches the documentation: E05.0 (goiter), E05.1 (nodule), E05.2 (goiter), E05.3 (tissue), E05.4 (factitia), E05.8 (thyrotoxicosis) and E05.9 (unspecified).

Don't report E05 together with the conditions in its Excludes1 note: chronic thyroiditis with transient thyrotoxicosis (E06.2) and neonatal thyrotoxicosis (P72.1).

It has been part of ICD-10-CM since the code set took effect on October 1, 2015 and hasn't changed since.

Specific codes under E05

Coding notes

Excludes1Not coded here — never report together with this code

chronic thyroiditis with transient thyrotoxicosis (E06.2)
neonatal thyrotoxicosis (P72.1)

Notes that apply from higher levels

Instructions written at a parent level also apply to E05.

Broader instructions also apply from Chapter 4: Endocrine, nutritional and metabolic diseases.

Codes whose notes reference E05

G73.3Code first
G99.0Code first
I27.29Code also
M14.8Code first

Code history

2016
2017
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2021
2022
2023
2024
2025
2026
2027

FY2016 (effective 10/1/2015): Added (first year of ICD-10-CM)
No changes since FY2016.

Common questions about E05

Is E05 billable?: No. E05 is a header code. Report one of its more specific subcodes instead.