Malignant neoplasm of upper third of esophagus

This code signifies a cancerous tumor located in the upper third of the esophagus, which is the muscular tube connecting the throat to the stomach. This malignancy originates in the tissues lining the esophageal wall in its most superior segment.

Apply this code when documentation confirms a primary malignant neoplasm specifically affecting the cervical or upper thoracic portion of the esophagus. This diagnosis is typically established through biopsy and imaging studies.

• Ensure the documentation clearly specifies "upper third" or a synonymous anatomical location (e.g., cervical esophagus).
• Distinguish from malignancies of the middle or lower esophagus, which have different ICD-9-CM codes.
• Always sequence this code as the primary diagnosis when it is the reason for the encounter.