ICD-10-CM 2027 diagnosis code
E05.3Thyrotoxicosis from ectopic thyroid tissue
E05.3 is a header code, so it can't be reported by itself. Choose one of the 2 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 E05.3
E05.3 is the ICD-10-CM diagnosis code for thyrotoxicosis from ectopic thyroid tissue. It belongs to category E05 (thyrotoxicosis [hyperthyroidism]), 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 2 subcodes must be used instead.
Within E05 (thyrotoxicosis [hyperthyroidism]), E05.3 is specifically for thyrotoxicosis from ectopic thyroid tissue. Related codes cover thyrotoxicosis with diffuse goiter (E05.0), thyrotoxicosis with toxic single thyroid nodule (E05.1), thyrotoxicosis with toxic multinodular goiter (E05.2), thyrotoxicosis factitia (E05.4), other thyrotoxicosis (E05.8) and thyrotoxicosis, unspecified (E05.9).
To report this condition, pick the subcode that matches the documentation: E05.30 (without thyrotoxic crisis or storm) and E05.31 (with thyrotoxic crisis or storm).
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 E05.3
Notes that apply from higher levels
Instructions written at a parent level also apply to E05.3.
Broader instructions also apply from Chapter 4: Endocrine, nutritional and metabolic diseases.
Code history
- 2016
- 2017
- 2018
- 2019
- 2020
- 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 E05.3
Is E05.3 billable?
- No. E05.3 is a header code. Report one of its more specific subcodes instead.