The line between health plan and provider organization is blurring quickly. Last week, Humana announced they will spend up to $550 million on senior-focused primary care centers (see Humana To Shell Out $550 Million To Buy Clinics From PE Partner). As part of their strategy to own provider capacity, Humana is reorganizing and rebranding their home health division (see Humana Finalizes Rebrand Of Home Health Division From Kindred At Home To CenterWell). This "payvider" phenomenon—organizations with health insuring and service delivery capacity—is one of the trends in the field shaping specialty and primary care organization strategy (For more on the strategic implications…