The Total Billed Amount on the Monthly $ report should correlate with the ChiroTouch Insurance Billings report. It should count any line item in the ledger that has been marked with a "B" during the specified time period (B =Billed). It includes charges that were billed during the specified time period to the primary policy. Secondary billings are not included.
Note: Some charges (such as personal injury) are not technically "billed" through ChiroTouch and will not show up in the Total Billed Amount. See ChiroTouch help article named "Move a charge from W (waiting) to B (billed) without actually billing" as a workaround to this issue.