Dr. Karin L. Andersson, MD

Gastroenterology (Gastroenterology Physician)

Medicare participating

Medical school: Yale University School of Medicine (2000)
Years since graduation: 26
In the NPI registry since: 2005
Medicare patients seen, 2024: 298

The NPI date is when this clinician registered for a National Provider Identifier, the billing number used on health claims. It is not a license, graduation or board-certification date. NPIs were first issued in May 2005 and became required on claims in 2007–2008, so an early date usually means the clinician was already in practice before then. What an NPI is

Education and training

2000Medical school: Yale University School of Medicine
2005Registered with an NPI (national billing number; not a license date) — NPIs began in 2005, so practice likely started earlier

Undergraduate school, residency, fellowship, licensing exams and board certification aren’t in public federal data. Board certification can be confirmed with the certifying board (ABMS member boards for MDs, AOA boards for DOs).

Specialties and state licenses

Gastroenterology Physician primary
MA license 213884
Internal Medicine Physician
MA license 213884

As reported to the NPI registry. To confirm a license is current, check the state medical board.

Map: Gastroenterology per capita by county →

Where they work

Hospitals

Brigham and Women's Hospital Boston, MA
Massachusetts General Hospital Boston, MA
Newton-Wellesley Hospital Newton, MA
North Shore Medical Center - Salem, MA
Wentworth-Douglass Hospital Dover, NH

Medical groups

Massachusetts General Physicians Organization Inc (3,558 clinicians)
The General Hospital Corporation (1,267 clinicians)

Hospitals this clinician lists with Medicare, and groups they bill Medicare through (Care Compare). Affiliation doesn’t mean they see patients at every location.

Medicare patients and services

Medicare patients, 2024: 298
Services billed: 552
Patients’ average age: 71

Most frequent Medicare services, 2023
Service	Times	Patients
Established patient office or other outpatient visit, 30-39 minutes	163	130
Subsequent hospital care with moderate levelof medical decision making, if using time, at least 35 minutes	74	30
Moderate sedation services provided by the same physician or other qualified health care professional performing a gastrointestinal endoscopic service that sedation supports, requiring the presence of an independent trained observer to assist in the monito	63	63
Established patient office or other outpatient visit, 40-54 minutes	47	42
Removal of polyps or growths of large bowel using an endoscope with mechanical snare	37	37
Subsequent hospital care with moderate levelof medical decision making, if using time, at least 50 minutes	32	13
Initial hospital care with straightforward or low-level medical decision making, if using time, at least 55 minutes	18	18
Colorectal cancer screening; colonoscopy on individual at high risk	16	16
Telephone medical discussion with physician, 21-30 minutes	15	12
Biopsy of esophagus, stomach, and/or upper small bowel using a flexible endoscope	15	15

Medicare fee-for-service only. CMS leaves out services billed for fewer than 11 patients. These figures describe a practice’s Medicare work; they aren’t a measure of quality.

Medicare prescriptions

Most prescribed drugs, Medicare Part D 2024
Drug	Prescriptions
Gavilyte-G (peg3350/sod sulf,bicarb,cl/kcl) Other prescribers in Boston, MA	60
Vemlidy (tenofovir alafenamide)	52
Omeprazole Other prescribers in Boston, MA	47
Famotidine Other prescribers in Boston, MA	33
Ursodiol Other prescribers in Boston, MA	23
Mycophenolate Mofetil Other prescribers in Boston, MA	22
Carvedilol Other prescribers in Boston, MA	21
Azathioprine Other prescribers in Boston, MA	16
Entecavir	14
Tacrolimus Other prescribers in Boston, MA	12

Prescriptions filled under Medicare Part D, including refills. CMS leaves out drugs prescribed fewer than 11 times.

At a glance