Marcel Horowitz, M. D.
Marcel Horowitz, M. D. is an Urology Physician in Baltimore, MD, registered under NPI 1003079047. NPPES records them as a sole proprietor, meaning the practice is not incorporated as a separate legal entity.
Getting there
Here is what surrounds this office in Baltimore, based on OpenStreetMap data collected Sep 4, 2026. Parking is available about 0.26 mi away at Cathedral Street Lot. The nearest transit stop is 384 ft away, served by Eutaw Street & Madison Avenue Southbound. A pharmacy sits 0.31 mi from the entrance (CVS Pharmacy), which helps if you leave with a prescription. If you arrive early, there is a coffee shop 0.25 mi away.
Getting here and what is nearby
Restaurant The Land of Kush 50 ft ~1 min
Transit Eutaw Street & MLK Boulevard Northbound 106 ft ~1 min
Restaurant Hip Hop Fish & Chicken 80 ft ~1 min
Transit MLK Boulevard & Linden Avenue Near-side 314 ft ~2 min
Transit Eutaw Street & Madison Avenue Southbound 384 ft ~2 min
Restaurant Wendy's 576 ft ~3 min
901 McCulloh Street, Baltimore 21201
08:00-22:00
Coffee The Bun Shop 666 ft ~3 min
239 West Read Street, Baltimore 21201
Su-We 08:00-20:00, Th-Sa 08:00-03:00
Coffee Café Andamiro 856 ft ~4 min
Parking 994 ft ~4 min
Hotel Biltmore Suites Hotel - Main Building 0.20 mi ~4 min
Hotel Biltmore Suites Hotel - Park Avenue Building 0.21 mi ~5 min
West Madison Street, Baltimore 21201
Pharmacy Mt. Vernon Pharmacy 0.22 mi ~5 min
Convenience 7-Eleven 0.23 mi ~5 min
1020 Park Avenue, Baltimore 21201
Mo-Su 05:00-23:00
Parking Symphony Center Parking 0.23 mi ~5 min
1030 Park Avenue, Baltimore 21201
Pharmacy Community, A Walgreens Pharmacy 0.23 mi ~5 min
1114 Cathedral Street, Baltimore 21201
Coffee Cafe Fili 0.25 mi ~5 min
816 Cathedral Street, Baltimore 21201
Mo-Sa 08:00-19:00; Su 09:00-16:00
Parking Cathedral Street Lot 0.26 mi ~6 min
1150 Cathedral Street, Baltimore 21201
Convenience George’s Grocery 0.28 mi ~6 min
606A North Eutaw Street, Baltimore 21201
Hotel Revival Baltimore 0.31 mi ~7 min
Pharmacy CVS Pharmacy 0.31 mi ~7 min
Convenience Bolton Hill Grocery 0.36 mi ~8 min
1111 Park Avenue, Baltimore 21217
Grocery Save-A-Lot 0.37 mi ~8 min
Gas station Gulf 0.44 mi ~9 min
417 West Mulberry Street, Baltimore 21201
Gas station Exxon 0.48 mi ~10 min
Grocery Po Tung Oriental Grocery 0.49 mi ~10 min
Grocery 7 Food Market 0.49 mi ~10 min
Distances are straight‑line estimates — walking routes may be longer. Hours and phone numbers can change; call ahead to confirm.
Credentials and Medicare
| Licence | State | Specialty |
|---|---|---|
| D0058217 | MD | Urology Physician primary |
This provider holds licence D0058217 issued in MD. A licence number in NPPES reflects what was filed at registration — it does not confirm the licence is still active today.
This NPI does not appear in the PECOS Medicare enrolment file. Providers who do not bill Medicare — or who bill only through a group's enrolment — will not appear here. It is not a sign of any problem with the registration.
What Urology covers
A urologist manages benign and malignant medical and surgical disorders of the genitourinary system and the adrenal gland. This specialist has comprehensive knowledge of and skills in endoscopic, percutaneous and open surgery of congenital and acquired conditions of the urinary and reproductive systems and their contiguous structures. NUCC Health Care Provider Taxonomy, code 208800000X
The taxonomy records how the provider classifies their own practice. It does not confirm which conditions they currently treat, whether they are accepting new patients, or which insurance they take — call the office for that.
Full NPPES record
An NPI-1 identifies a single person. It stays with the clinician for life, even if they move practice or change state, which is why the address on file can lag behind where they actually work today.
| NPI | 1003079047 valid check digit |
|---|---|
| Entity type | Individual (NPI-1) |
| Enumeration date | Jul 9, 2008 |
| Last updated | Jul 9, 2008 |
| Status | Active |
| Sole proprietor | Yes |
| Gender | Male |
| Credential | M. D. |
| Practice address |
838 N EUTAW ST Baltimore, MD 21201 (410) 523-2150 |
| Mailing address |
1425 BOLTON ST Baltimore, MD 21217 |
Number check
How the check works, step by step
Every NPI carries a Luhn check digit — the same scheme used on credit cards. CMS prefixes the number with 80840 before computing it, which marks it as a US health identifier.
| Digit | 8 | 0 | 8 | 4 | 0 | 1 | 0 | 0 | 3 | 0 | 7 | 9 | 0 | 4 |
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
| Doubled? | — | ×2 | — | ×2 | — | ×2 | — | ×2 | — | ×2 | — | ×2 | — | ×2 |
| Value | 8 | 0 | 8 | 8 | 0 | 2 | 0 | 0 | 3 | 0 | 7 | 9 | 0 | 8 |
Sum = 53 · next multiple of 10 = 60 · check digit = 7 · actual last digit = 7
A valid check digit only means the number is well-formed. It does not mean the provider is licensed, active, or in good standing — those are separate questions answered by the sections above.