To get paid correctly for the drugs you dispense, you simply report the correct HCPCS code and billable units. In reality, many hospitals, clinics and other providers leave thousands of dollars behind every day, often because they don't accurately translate dosages into billable units according to HCPCS drug code descriptions. Billing errors also occur due to incorrect HCPCS drug codes, incomplete pricing data, lack of documented medical necessity and limited coding resources.