Find missing rows from two data sets based on multiple criteria

Question

I have two datasets, one of claims I have submitted to our biller, another of claims that my biller has in their system. These data sets contain some of the same data and some different data.

I need to compare the two data sets based on 3 columns and find any rows in my data set that are missing from my billers data set.

I am open to different solutions. It can create a 3rd data set with only the missing rows, or it can add a new column into my data set that tells me if the row is missing from the billers data.

My data:

Billers data:

In the example I need to find the missing rows based on PHN (Health Card), Bill Date (Date of Service), Fee Code (Billing Code).

Here is a link to a sample sheet that may be helpful https://docs.google.com/spreadsheets/d/1gFQUQhKw2tc8ioaGHe-rmTaUWvhzq4Qq9JU7FIb4chY/edit?usp=sharing