Dr. Andreas M. Kaiser, M.D.
Colorectal Surgery (Colon & Rectal Surgery Physician)
1500 Duarte Rd
Duarte, CA 91010
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
- Years since graduation
- 38
- In the NPI registry since
- 2006
- Medicare patients seen, 2024
- 282
Licensed in California since 2002, 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
- 2006Registered with an NPI (national billing number; not a license date) — NPIs began in 2005, so practice likely started earlier
Medicare’s Care Compare data doesn’t list this clinician’s medical school. 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
-
Colon & Rectal Surgery Physician primary
CA license A81359 (first issued 2002; current) -
Surgery Physician
CA license A81359 (first issued 2002; current)
As reported to the NPI registry. To confirm a license is current, check the state medical board.
Where they work
Medical groups
- City of Hope Medical Foundation (982 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
- 282
- Services billed
- 843
- Patients’ average age
- 72
| Service | Times | Patients |
|---|---|---|
| Established patient office or other outpatient visit, 30-39 minutes | 290 | 205 |
| Established patient office or other outpatient visit, 40-54 minutes | 101 | 72 |
| New patient office or other outpatient visit, 45-59 minutes | 63 | 63 |
| New patient office or other outpatient visit, 60-74 minutes | 57 | 57 |
| Diagnostic exam of lower portion of large bowel using a flexible endoscope | 49 | 40 |
| Diagnostic exam of large bowel using a flexible endoscope | 31 | 31 |
| Biopsy of large bowel using a flexible endoscope | 20 | 20 |
| Repair of abdomen using abdominal lining graft | 20 | 20 |
| Closure of surgically created large or small bowel opening with bowel removal and reattachment | 11 | 11 |
| Removal of polyps or growths of large bowel using an endoscope with mechanical snare | 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 |
|---|---|
| Sod Sulf-Potass Sulf-Mag Sulf (sodium, potassium,mag sulfates) Other prescribers in Duarte, CA | 19 |
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, 2 companies reported 2 payments worth $119 in total to this clinician.
| Aroa Biosurgery Incorporated | $70.10 |
|---|---|
| Integra Lifesciences Corporation | $49.38 |
| Food and Beverage | $119 |
|---|
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.