Answer & Rationale

What is the date of diagnosis?
The date of diagnosis is 01/02/2004, the date of the CT scan, because that is the first time the acoustic neuroma was diagnosed. The date of diagnosis is the first date the condition was recognized by a medical practitioner, not the first date of pathologic confirmation.

What is the sequence number?
The sequence number is 60 because it is a solitary benign tumor.

What is the CS extension?
The CS extension code is 05, benign.

Primary site: C72.4 acoustic nerve

Histology: 9560/09 acoustic neuroma