E05.5 ICD-10-CA code: Thyroid crisis or storm
E05.5 is the ICD-10-CA code for “Thyroid crisis or storm” in CIHI’s FY 2026–2027 release, in effect from Apr 1, 2026.
Official description
E05.5Thyroid crisis or storm
ICD-10-CA · Canada · Also written E055
Index terms
Entries in CIHI’s alphabetical index that lead to E05.5. Searching the index by the condition the note names is how coders reach this code.
- Storm, thyroid
- Crisis, thyroid
- Crisis, thyrotoxic
- Thyrotoxic, storm or crisis
- Delirium, delirious (acute or subacute) (not alcohol or drug induced), thyroid
Notes for E05.5
As CIHI prints them, with any note E05.5 takes from the headings above it.
Includes
- Thyroid (thyrotoxic):• eye disease† (H58.8*)• heart disease† (I43.8*)From E05 Thyrotoxicosis [hyperthyroidism]
Excludes
Conditions classified elsewhere.
- Chronic thyroiditis with transient thyrotoxicosis (E06.2)neonatal thyrotoxicosis (P72.1)From E05 Thyrotoxicosis [hyperthyroidism]
- Complications of pregnancy, childbirth and the puerperium (O00-O99)symptoms, signs and abnormal clinical and laboratory findings, not elsewhere classified (R00-R99)transitory endocrine and metabolic disorders specific to fetus and newborn (P70-P74)From Chapter 4: Endocrine, nutritional and metabolic diseases (E00-E90)
Note
- All neoplasms, whether functionally active or not, are classified in Chapter II. Appropriate codes in this chapter (i.e. E05.8)(E07.0) (E16-E31)(E34.-) may be used, if desired, as additional codes to indicate either functional activity by neoplasms and ectopic endocrine tissue or hyperfunction and hypofunction of endocrine glands associated with neoplasms and other conditions classified elsewhere.From Chapter 4: Endocrine, nutritional and metabolic diseases (E00-E90)
Where E05.5 sits
- 1ChapterChapter 4: Endocrine, nutritional and metabolic diseases (E00-E90)
- 2Block E00-E07Disorders of thyroid gland
- 3Category E05Thyrotoxicosis [hyperthyroidism]
- 4Valid code E05.5Thyroid crisis or storm
Source and release
- Data release
- ICD-10-CA · FY 2026–2027
- Effective date
- Apr 1, 2026
- Publisher
- CIHI
This page is built from the ICD-10-CA catalog that Vero Codes reads when it suggests codes: Canadian Institute for Health Information’s FY 2026–2027 release, imported from the publisher’s file and checked against it. The description, notes and structured data come from the same record.
Frequently asked questions
What does ICD-10-CA code E05.5 mean?
E05.5 is the ICD-10-CA code for “Thyroid crisis or storm” in CIHI’s ICD-10-CA FY 2026–2027 release.
Where is E05.5 in ICD-10-CA?
E05.5 sits under E05 Thyrotoxicosis [hyperthyroidism], within E00-E07 Disorders of thyroid gland, within Chapter 4: Endocrine, nutritional and metabolic diseases (E00-E90).
What coding notes apply to E05.5?
ICD-10-CA lists Includes, Excludes, Note notes for E05.5, including those from the headings it sits under. They are listed on this page with where each one comes from.
Which ICD-10-CA release does this page use?
It uses CIHI’s FY 2026–2027 release, in effect from Apr 1, 2026 to Mar 31, 2027. It is a reference: confirm the code against the current list and the payer’s rules before you submit it.