New smartphone apps can deliver doctors to your doorstep.

Heal is a smartphone app similar to the on-demand car service Uber, but instead of a car, a doctor shows up at your door. Users download the app and then type in a few details such as address and the reason for the visit. After adding a credit card and a request for a family doctor or a pediatrician, the physician arrives in 20 to 60 minutes for a flat fee of $99. Heal began in Los Angeles in February, recently expanded to San Francisco and is set to roll out in another 15 major cities this year. Heal doctors are on call from 8 a.m. to 8 p.m., seven days a week, said Dr. Renee Dua, a founder and the chief medical officer of Heal.

Heal doctors arrive with a medical assistant and a kit stocked with the latest high-tech health gadgets, including tools needed to take your vitals or shoot high-definition video of your eardrum. Heal has a roster of doctors who have affiliations with respected hospitals and programs such as the University of California, Los Angeles; Columbia; and Stanford.

“We’re bringing back old-school techniques with new-school technology,” Dr. Dua said.

Obviously, Heal doctors can offer only limited services on a house call. Among other things, they can diagnose and treat moderate ailments like bronchitis, give flu shots, stitch up a nasty cut or write a prescription (they will even pick the prescription up for an extra $19). But you will have to file the insurance paperwork.

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Jeffrey R. Ungvary President