The decision
A billing company may assign assistants to one client or distribute tasks across several accounts. Decide the model before hiring and document how work is prioritised when queues compete. Avoid allowing urgent work for one client to silently consume another client's committed capacity.
What to compare
Keep client-specific instructions, permissions and escalation contacts distinct. Confirm that agreements and approved access cover the proposed working arrangement. Train the assistant on the differences between systems and payer workflows instead of assuming all accounts are interchangeable.
Before you commit
Build a staffing plan around recurring volume, peak periods and absence cover. Review quality by client and task. A single blended productivity number can hide where the team is overloaded.