As for your first question, 00840 is the proper code for a lap appy. If an AAPC course told you otherwise, be sure to let them know the error so they can correct it.
As for modifiers and billing, some of this will vary based on payer requirements. It's always a good idea to get to know your payers and how they want you to bill.
Which concurrency modifiers you use will depend on your practice. If you bill for an anesthesiologist and he/she always works alone, you will use AA. If your doc works with CRNAs or you bill for CRNAs, you will need those modifiers as well.
For some payers (including Medicare) you need QS to report MAC when that is the mode of anesthesia.
You also want to use the physical status modifiers. Some payers will allow extra payment for these and some won't but it's a good idea to include them.
Fees are pretty straightforward. Add the base units (RVG value) to the time units (1 unit for every 15 minutes - Medicare wants this down to the minute, no rounding. most others want it rounded. We round up for 7 minutes or more and down for 6 minutes or less) plus any modifying units (for example, P4 = 2 units, 99140 = 2 units) and multiply the result by the doc's fee. Sounds like you're going way beyond what most coders do. I'm surprised the billing system doesn't do the charge calculations for you.
It also sounds like you're working without a Crosswalk and RVG. I highly recommend you get these. I can't imagine coding/billing anesthesia without them.
Hope this was some help. Good luck!
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