Hi storm214,
As a fellow cvs tech, I can give you a few hints to find the right insurance. When a customer presents his or her insurance card, I immediately look for the RxBin number. Then I look for the PCN number. When you type in the Bin, insurances with the same bin will show up in alphabetical order. If you still don't see the one you're looking for, you can look on the back of the card, and usually there's information about pharmacy benefits.
Here are the common RxBin's that I have memorized.
1. 003858 - Express Scripts (ignore the first 3 letters in the ID, start with the first numerical digit)
2. 610502 - Aetna (Type ID exactly as it shows on the card)
3. 600428 - Blue Shield (ignore the first 3 letters in the ID, start with the 4th digit. Sometimes it's a number, and sometimes it's the letter "J")
4. 610053 - Anthem Blue Cross (ignore the first 3 letters, start with the first numerical digit in the ID number)
5. 610014 - Medco Express Scripts
6. 004336 - Health Net (ID number always start with the letter "R") and Caremark
7. 610279 - OptumRx and United Health Care
Hope this helps you! As you spend more time at Drop-Off, you'll become more familiar with insurances.