The problem with American health care is not the care. It’s the insurance.

Both parties have stumbled to enact comprehensive health care reformbecause they insist on patching up a rickety, malfunctioning model. The insurance company model drives up prices and fragments care. Rather than rejecting this jerry-built structure, the Democrats’ Obamacare legislation simply added a cracked support beam or two. The Republican bill will knock those out to focus on spackling other dilapidated parts of the system.

An alternative structure can be found in the early decades of the 20th century, when the medical marketplace offered a variety of models. Unions, businesses, consumer cooperatives and ethnic and African-American mutual aid societies had diverse ways of organizing and paying for medical care.

Physicians established a particularly elegant model: the prepaid doctor group. Unlike today’s physician practices, these groups usually staffed a variety of specialists, including general practitioners, surgeons and obstetricians. Patients received integrated care in one location, with group physicians from across specialties meeting regularly to review treatment options for their chronically ill or hard-to-treat patients.

Individuals and families paid a monthly fee, not to an insurance company but directly to the physician group. This system held down costs. Physicians typically earned a base salary plus a percentage of the group’s quarterly profits, so they lacked incentive to either ration care, which would lose them paying patients, or provide unnecessary care. ...