Updated November 2026How we check doctors
Pins show each doctor's main office. Gold pins are in Massachusetts, navy pins are nearby.
Same order as the list above. A comparison, not a ranking.
| Doctor | Type | Education and training | Reviews |
|---|---|---|---|
| Lynne Ahn, MD | Concierge · Gastroenterology physician | University of California, San Francisco | |
| Charles Birbara, MD | Concierge · Rheumatology |
FindMyDirectDoctor lists 2 doctors for igg4 related disease in Massachusetts. We last checked this list in November 2026.
We confirmed board certification for 1 doctor on this list. Each profile shows the board and the specialty.
It depends on the practice. Many direct primary care and concierge practices charge a membership fee instead of billing insurance for office visits, and some also accept insurance. Each profile says how its practice works when the practice states it.