Making sure your claims are adequately documented is more important than ever before under the Patient-Driven Groupings Model that took effect Jan. 1. A new tool from one HHH Medicare Administrative Contractor can help. MAC CGS has updated its Home Health Documentation Checklist tool at . The checklist covers the face-to -face encounter, homebound status, plan of care, orders, medical necessity, certification/recertification and OASIS, CGS explains.