ICD-10 Code C15.9 – Malignant neoplasm of esophagus, unspecified (2026): Diagnosis, Symptoms & Billing Guide
2026 ICD-10-CM Diagnosis Code C15.9 – Malignant neoplasm of esophagus, unspecified
What it is
C15.9 identifies a malignant tumor of the esophagus when the site is not further specified. Use it when the record confirms esophageal cancer but does not document a more precise location.
Clinical signs
Clinical features vary; refer to documentation. Commonly recorded findings include progressive dysphagia, weight loss, odynophagia, or endoscopic evidence of an esophageal mass, but you should code only what is documented.
When to use this code
Use C15.9 when the provider documents primary esophageal malignancy and the chart does not identify the upper, middle, or lower esophagus. It also applies when pathology or imaging confirms esophageal cancer, but the exact subsite remains unspecified. If later documentation gives a more precise location, code that instead.
Do not use for
Do not use this code for benign esophageal lesions, suspected cancer without confirmation, or malignancy that is clearly documented in a specific esophageal subsite. Check documentation if the cancer involves the gastroesophageal junction or another adjacent site.
Coding tip
If the record says only “esophageal cancer,” assign C15.9 unless a more specific esophageal location is documented.