Dr. Ann M. Chen, MD
Gastroenterology (Gastroenterology Physician)
300 Pasteur Dr, A149, Mc5202
Stanford, CA 94305
Who else practices at this address →
Santa Clara County includes mental health (13% of residents) shortage areas. About shortage areas
- Medicare participating
At a glance
- Medical school
- Albert Einstein College of Medicine of Yeshiva University (2000)
- Years since graduation
- 26
- In the NPI registry since
- 2006
- Medicare patients seen, 2024
- 112
Licensed in California since 2001, 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. 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: Albert Einstein College of Medicine of Yeshiva University
- 2006Registered 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
CA license A76890 (first issued 2001; current)
As reported to the NPI registry. To confirm a license is current, check the state medical board.
Where they work
Hospitals
- Santa Clara Valley Medical Center San Jose, CA
Medical groups
- County of Santa Clara (1,022 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
- 112
- Services billed
- 188
- Patients’ average age
- 72
| Service | Times | Patients |
|---|---|---|
| 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 | 81 | 77 |
| Initial hospital care with straightforward or low-level medical decision making, if using time, at least 55 minutes | 33 | 31 |
| Established patient office or other outpatient visit, 30-39 minutes | 29 | 28 |
| Diagnostic exam of esophagus, stomach, and/or upper small bowel using a flexible endoscope | 22 | 22 |
| Ultrasound guided needle aspiration or biopsy of esophagus, stomach, and/or upper small bowel using a flexible endoscope | 17 | 17 |
| Biopsy of esophagus, stomach, and/or upper small bowel using a flexible endoscope | 14 | 14 |
| Diagnostic exam of large bowel using a flexible endoscope | 14 | 14 |
| Biopsy of large bowel using a flexible endoscope | 13 | 13 |
| New patient office or other outpatient visit, 45-59 minutes | 11 | 11 |
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
| Drug | Prescriptions |
|---|---|
| Omeprazole Other prescribers in Stanford, CA | 47 |
| Entecavir | 17 |
| Famotidine Other prescribers in Stanford, CA | 17 |
| Linzess (linaclotide) Other prescribers in Stanford, CA | 12 |
| Peg-3350 And Electrolytes (peg3350/sod sulf,bicarb,cl/kcl) Other prescribers in Stanford, CA | 12 |
Prescriptions filled under Medicare Part D, including refills. CMS leaves out drugs prescribed fewer than 11 times.