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E04.1 — Nontoxic single thyroid nodule
E04.1
What this code means
A single lump (nodule) in the thyroid gland that is not overactive; most are benign.
Also called: thyroid nodule, nontoxic single thyroid nodule.
When this code is used
Used for a nontoxic single thyroid nodule.
Where it sits in ICD-10-CM
Code E04.1 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 anatomy
Watch: related videos
Frequently asked questions
What is ICD-10-CM code E04.1?
E04.1 is the ICD-10-CM diagnosis code for “Nontoxic single thyroid nodule”. A single lump (nodule) in the thyroid gland that is not overactive; most are benign.
When is code E04.1 used?
Used for a nontoxic single thyroid nodule. 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.