Assisted Living Facilities

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My PCP provider sees patients at an Assisted Living facility. I have always billed POS 13 and CPT 99324-99337. I have a new provider that says he bills his Assisted Living facility patient with home codes (99341-99350) with POS 12. Under what circumstance is it okay to bill a home visit for an ALF patient? Does it depend if they are in a private appt., memory care unit, etc. located in in the ALF?