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C73 — Malignant neoplasm of thyroid gland
C73
What this code means
Cancer that starts in the thyroid, the butterfly-shaped gland at the front of the neck.
Also called: thyroid cancer.
When this code is used
Used for malignant neoplasm of the thyroid gland.
Where it sits in ICD-10-CM
Code C73 belongs to Chapter 2: Neoplasms, which covers codes C00–D49 in the FY2027 ICD-10-CM tabular list. The official description above is copied verbatim from the CDC/NCHS FY2027 code file.
Learn more about this condition
Related anatomy
Watch: related videos
Frequently asked questions
What is ICD-10-CM code C73?
C73 is the ICD-10-CM diagnosis code for “Malignant neoplasm of thyroid gland”. Cancer that starts in the thyroid, the butterfly-shaped gland at the front of the neck.
When is code C73 used?
Used for malignant neoplasm of the thyroid gland. It belongs to Chapter 2 of ICD-10-CM (Neoplasms).
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.