Dr. Alan Chen, M.D.
Gastroenterology (Gastroenterology Physician)
20911 Earl St Ste 220
Torrance, CA 90503
Who else practices at this address →
Los Angeles County includes primary care (7% of residents) and mental health (13% of residents) shortage areas. About shortage areas
- Medicare participating
At a glance
- Medical school
- Duke University School of Medicine (2014)
- Years since graduation
- 12
- In the NPI registry since
- 2014
- Medicare patients seen, 2024
- 452
Licensed in California since 2026, according to the Medical Board of California. We show license dates only for the states that publish them in bulk; see which states do. For other states, check the state medical board.
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. What an NPI is
Education and training
- 2014Medical school: Duke University School of Medicine
- 2014Registered with an NPI (national billing number; not a license date)
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
CA license C207362 (first issued 2026; current) · MD license D0089536
As reported to the NPI registry. To confirm a license is current, check the state medical board.
Where they work
Hospitals
- Medstar Franklin Square Medical Center Rosedale, MD
Medical groups
- Medstar Medical Group II LLC (3,767 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
- 452
- Services billed
- 723
- Patients’ average age
- 72
| Service | Times | Patients |
|---|---|---|
| Initial hospital care with moderate level of medical decision making, if using time, at least 75 minutes | 99 | 98 |
| Established patient office or other outpatient visit, 30-39 minutes | 88 | 79 |
| New patient office or other outpatient visit, 45-59 minutes | 81 | 81 |
| Removal of polyps or growths of large bowel using an endoscope with mechanical snare | 60 | 60 |
| Diagnostic exam of esophagus, stomach, and/or upper small bowel using a flexible endoscope | 55 | 54 |
| Biopsy of esophagus, stomach, and/or upper small bowel using a flexible endoscope | 49 | 49 |
| Biopsy of large bowel using a flexible endoscope | 46 | 46 |
| New patient office or other outpatient visit, 30-44 minutes | 43 | 43 |
| Established patient office or other outpatient visit, 20-29 minutes | 34 | 30 |
| Colorectal cancer screening; colonoscopy on individual at high risk | 32 | 31 |
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
Prescriptions filled under Medicare Part D, including refills. CMS leaves out drugs prescribed fewer than 11 times.
Payments from drug and device companies
In 2025, 5 companies reported 11 payments worth $241 in total to this clinician.
| Ardelyx, Inc. | $62.24 |
|---|---|
| Janssen Biotech, Inc. | $60.96 |
| Pfizer Inc. | $59.01 |
| Takeda Pharmaceuticals U.S.A., Inc. | $35.92 |
| AbbVie Inc. | $22.90 |
| Food and Beverage | $241 |
|---|
From CMS Open Payments. A payment is not evidence of wrongdoing; many are for consulting, teaching or meals. Clinicians can review and dispute their records with CMS.