Formula help to sum groups within a large table based on filters

Hello everyone,

I'm having trouble coming up with the correct DAX expression for a measure I need.

My data is only available in one large table.

Encounter IDs are unique to patient visits (a concatenated acct number & date of service). For each Encounter ID there are multiple Procedure Codes charged, and each Procedure code has an RVU number attached to it. Therefore, there are multiple instances of any one Encounter ID in the table.

I am trying to write a measure that basically does the following:

For each DISTINCT Encounter ID, Adding all of the RVU values that were Charged, Adding those values together for a complete total, and then classifying that Encounter as Low RVU (<5 total) or High RVU (> 5 total).

Putting it another way, I want to 

1. Filter the table using the first Encounter ID and a [Record Type Desc] = "Charge"

2. Add the RVU value of all rows of the filtered table to come up with a SUM of RVU for that specific Encounter ID

3. Iterating this process for each Distinct Encounter ID

4. then adding the SUM of RVU for each Encounter ID together for an overall total RVU value

then

5. classifying each Encounter ID as "High" (Sum of Encoutner RVU >5) or "Low" (Sum of Encounter RVU <5)

I have tried many combinations of CALCULATE, SUM, SUMX and FILTER but cannot seem to get it to work and can't find any previous article that I can correlate directly. Any help would be greatly appreciated!!