Hospitalists as extensivists

I had heard something about this, but couldn't find it. A colleague here finally tracked it down. The story is about Caremore, a California based organization. Hospitalists generally are internal medicine doctors based in the hospital; but here they care for frail elderly members at high risk of hospital admission or readmission in skilled nursing facilities and in outpatient settings both before and after a hospital stay. Here's an article on the AHRQ Innovations Exchange website.

An excerpt:

A Medicare Advantage plan expanded the role of its employed hospitalists, using them to continue following and caring for recently discharged members until their condition stabilizes, as well as other members at high risk of a hospital admission. Known as "extensivists" and supported by sophisticated information technology (IT) systems, these physicians generally split their time between the hospital, where they round on a small group of members each day, and an outpatient clinic, where they see recently discharged members and other members at high risk of an admission. Once or twice a week, these physicians also see members in SNFs.

The results:

The program reduced readmission rates and has led to low LOS (lengths of stay) and to below-average inpatient utilization in a high-acuity population.

Is this worth considering more broadly? What are the conditions for success? I welcome your thoughts.