Dr. Marcus H. Loo, M.D.
Urology (Urology Physician)
- Medicare participating
At a glance
- Medical school
- Js Weill Medical College, Cornell University (1981)
- Years since graduation
- 45
- In the NPI registry since
- 2005
- Medicare patients seen, 2024
- 284
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
- 1981Medical school: Js Weill Medical College, Cornell University
- 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
-
Urology Physician primary
NY license 159685
As reported to the NPI registry. To confirm a license is current, check the state medical board.
Medicare patients and services
- Medicare patients, 2024
- 284
- Services billed
- 1,329
- Patients’ average age
- 78
| Service | Times | Patients |
|---|---|---|
| Limited ultrasound scan of pelvis | 274 | 245 |
| Urinalysis, manual test | 258 | 183 |
| Ultrasound scan of pelvic region through rectum | 254 | 220 |
| Established patient office or other outpatient visit, 20-29 minutes | 224 | 180 |
| Electronic assessment of bladder emptying | 156 | 131 |
| Dilation of urethra using an endoscope | 70 | 58 |
| Telephone medical discussion with physician, 11-20 minutes | 62 | 56 |
| New patient office or other outpatient visit, 30-44 minutes | 60 | 60 |
| Established patient office or other outpatient visit, 30-39 minutes | 54 | 51 |
| Ultrasound measurement of bladder capacity after voiding | 45 | 40 |
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 |
|---|---|
| Tamsulosin Hcl Other prescribers in New York, NY | 2,757 |
| Finasteride Other prescribers in New York, NY | 2,675 |
| Ciprofloxacin Hcl Other prescribers in New York, NY | 779 |
| Myrbetriq (mirabegron) Other prescribers in New York, NY | 415 |
| Alfuzosin Hcl Er (alfuzosin hcl) Other prescribers in New York, NY | 273 |
| Dutasteride Other prescribers in New York, NY | 234 |
| Nitrofurantoin Mono-Macro (nitrofurantoin monohyd/m-cryst) Other prescribers in New York, NY | 214 |
| Silodosin Other prescribers in New York, NY | 138 |
| Oxybutynin Chloride Er (oxybutynin chloride) Other prescribers in New York, NY | 117 |
| Doxazosin Mesylate Other prescribers in New York, NY | 94 |
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, 6 companies reported 9 payments worth $235 in total to this clinician.
| Janssen Biotech, Inc. | $79.80 |
|---|---|
| Pfizer Inc. | $45.70 |
| AstraZeneca Pharmaceuticals LP | $35.06 |
| Progenics Pharmaceuticals, Inc. | $26.67 |
| Sumitomo Pharma America, Inc. | $24.98 |
| Coloplast Corp | $22.41 |
| Food and Beverage | $200 |
|---|---|
| Education | $35.06 |
What the payments were for
| Company | What it was for | Amount |
|---|---|---|
| AstraZeneca Pharmaceuticals LP Nov 13, 2025 | Education IMFINZI · Oncology · in-kind Company’s descriptionJournal Article | $35.06 |
Each payment as the company reported it, with the products it named. Meals are counted in the totals above but not listed one by one.
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.