• Walden Surgical Associates

Make an Appointment

We look forward to becoming acquainted with you and your family. We hope to be able to meet your health care needs and address your concerns. Please call the office to schedule your first appointment.


Insurance Information

We are proud to accept most major insurance carriers including the following. Call the office if you don’t see your insurance listed.

  • AETNA US HealthCare
  • Blue Cross / Blue Shield of Massachusetts
  • Boston Medical Center Connector Plan B
  • Commonwealth Care Alliance Senior Care Options
  • Fallon (Community Health Plan & Select plans only)
  • Harvard Pilgrim Health Care
  • HP Focus Network
  • MassHealth/Medicaid – Standard (Partners Healthcare Choice ACO only)
  • Medicare
  • Neighborhood Health Plan – Commercial
  • Network Health – Commercial only
  • Tufts Health Plans
  • Tufts Health Plan Senior Care Options
  • Tufts Direct
  • Tufts Medicare Preferred
  • Tufts Network Health
  • US Family Health Plans
  • Unicare – GIC
  • UnitedHealthcare

What our patients have to say about us:

In my own mind, I had overblown the difficulty of having a colonoscopy, but it turned out to be a piece of cake. The sedatives we use these days are terrific. But when I woke up afterwards, Dr. Raj Devarajan, my gastroenterologist, gave me the bad news: he found a mass in my large intestine. He said this kind of mass turns out to be cancer in the vast majority of cases. I would need to have surgery.

Read James’ full story

James Street
Pauline Avery wasn’t worried about her symptoms. But then she described her mild stomach pain and bowel changes to Betty Pomerleau, MD, her primary care physician at Lincoln Physicians. “Dr. Pomerleau said ‘let’s check it out,’ so I was scheduled for a CT scan,” Ms. Avery recalls. The test revealed a mass in her colon, so she went for a colonoscopy, which provided a more detailed diagnosis, as well as devastating news.

Read Pauline’s full story

Pauline Avery
John Yates was not eager to have hernia surgery this past summer. But, Mr. Yates couldn’t ignore the symptoms which included pain in his lower left abdomen and a bulge that became more prominent throughout the day.

Read John’s full story

John Yates

Dr. Alexandra Columbus

Alexandra Columbus, MD

Dr. Columbus is board certified in both general surgery and colorectal surgery. Her clinical interests include anorectal disease, colon and rectal cancer, diverticular disease, inflammatory bowel disease, and pelvic floor dysfunction. Read more

Meet the staff:

Dr. Atif Khan

Dr. Atif Khan

Dr. Khan is board certified in surgery, and his clinical interests include laparoscopic (minimally invasive) surgery of the abdomen and treating diseases of the gastrointestinal tract and skin. He joined the staff at Emerson Hospital in 2010 and he is currently the Chief of General/Vascular Surgery.
Read more

Dr. Elizaveta Ragulin Coyne

Dr. Ragulin Coyne

Dr. Ragulin Coyne is board certified in surgery. Dr. Ragulin Coyne’s clinical interests are laparoscopic surgery including complex hernias, endocrine surgery, breast surgery, and melanoma surgery. She also performs gallbladder surgery and a variety of gastrointestinal procedures and is a member of the American College of Surgeons and Society for Surgery of the Alimentary Tract.  Read more

Dr. Christopher Schlieve

Christopher Schlieve, MD

Christopher Schlieve, MD, is board certified in general surgery. His clinical interests include adult and pediatric minimally-invasive general surgery, abdominal wall defects, gastrointestinal and colorectal disease, as well as breast, melanoma, and thyroid/parathyroid surgery. Read more