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E05.90 — Thyrotoxicosis, unspecified without thyrotoxic crisis or storm
E05.90
What this code means
Thyrotoxicosis means excess thyroid hormone in the body, speeding up metabolism, without a documented crisis.
Also called: hyperthyroidism, overactive thyroid, thyrotoxicosis.
When this code is used
Used for thyrotoxicosis (hyperthyroidism) without thyrotoxic crisis or storm, cause unspecified.
Where it sits in ICD-10-CM
Code E05.90 belongs to Chapter 4: Endocrine, nutritional and metabolic diseases, which covers codes E00–E89 in the FY2027 ICD-10-CM tabular list. The official description above is copied verbatim from the CDC/NCHS FY2027 code file.
Related symptoms
Related anatomy
Watch: related videos
Frequently asked questions
What is ICD-10-CM code E05.90?
E05.90 is the ICD-10-CM diagnosis code for “Thyrotoxicosis, unspecified without thyrotoxic crisis or storm”. Thyrotoxicosis means excess thyroid hormone in the body, speeding up metabolism, without a documented crisis.
When is code E05.90 used?
Used for thyrotoxicosis (hyperthyroidism) without thyrotoxic crisis or storm, cause unspecified. It belongs to Chapter 4 of ICD-10-CM (Endocrine, nutritional and metabolic diseases).
This guide explains ICD-10-CM codes in plain language for patients, students and other readers. It is educational information only — not coding, billing or medical advice. The code recorded for any real encounter is assigned from the full clinical documentation by the treating team and qualified coders, and only they can decide which code fits a specific case.