Dr. Mark W. Dersch, MD
Urology (Urology Physician)
- Medicare participating
At a glance
- Medical school
- Indiana University School of Medicine (1989)
- Years since graduation
- 37
- In the NPI registry since
- 2006
- Medicare patients seen, 2024
- 1,034
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
- 1989Medical school: Indiana University School of Medicine
- 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
-
Urology Physician primary
FL license ME66575
As reported to the NPI registry. To confirm a license is current, check the state medical board.
Where they work
Hospitals
- Adventhealth Ocala Ocala, FL
Medical groups
- Advanced Urology Institute LLC (144 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
- 1,034
- Services billed
- 14,084
- Patients’ average age
- 78
| Service | Times | Patients |
|---|---|---|
| Bcg live intravesical instillation, 1 mg | 2,700 | 18 |
| Automated urinalysis test | 1,992 | 1,066 |
| Low osmolar contrast material, 300-399 mg/ml iodine concentration, per ml | 1,775 | 25 |
| Established patient office or other outpatient visit, 30-39 minutes | 1,325 | 812 |
| Insertion of needle into vein for collection of blood sample | 694 | 535 |
| Ultrasound measurement of bladder capacity after voiding | 445 | 311 |
| Established patient office or other outpatient visit, 20-29 minutes | 416 | 362 |
| Injection, gadolinium-based magnetic resonance contrast agent, not otherwise specified (nos), per ml | 270 | 16 |
| Chronic care management services, first 20 minutes of clinical staff time directed by health care professional, per calendar month | 263 | 64 |
| X-ray of abdomen, 1 view | 220 | 158 |
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 Ocala, FL | 1,273 |
| Finasteride Other prescribers in Ocala, FL | 832 |
| Dutasteride Other prescribers in Ocala, FL | 498 |
| Alfuzosin Hcl Er (alfuzosin hcl) Other prescribers in Ocala, FL | 187 |
| Solifenacin Succinate Other prescribers in Ocala, FL | 185 |
| Silodosin Other prescribers in Ocala, FL | 132 |
| Gemtesa (vibegron) Other prescribers in Ocala, FL | 122 |
| Orgovyx (relugolix) | 115 |
| Myrbetriq (mirabegron) Other prescribers in Ocala, FL | 93 |
| Tadalafil | 67 |
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, 23 companies reported 64 payments worth $2,204 in total to this clinician.
| Bayer HealthCare Pharmaceuticals Inc. | $273 |
|---|---|
| Procept Biorobotics Corporation | $260 |
| Sumitomo Pharma America, Inc. | $189 |
| Astellas Pharma US Inc | $178 |
| Janssen Biotech, Inc. | $161 |
| Ferring Pharmaceuticals Inc. | $157 |
| Teleflex LLC | $140 |
| AbbVie Inc. | $127 |
| Food and Beverage | $2,114 |
|---|---|
| Education | $89.84 |
What the payments were for
| Company | What it was for | Amount |
|---|---|---|
| Seagen Inc. Oct 9, 2025 | Education in-kind | $84.99 |
| Sumitomo Pharma America, Inc. Feb 4, 2025 | Education GEMTESA · UROLOGY · in-kind | $4.85 |
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.