Derek Mason, MD, MPH
Derek Mason, MD, MPH is a provider specialising in Student in an Organized Health Care Education/Training Program in Baltimore, MD, registered under NPI 1003550633.
Getting there
Here is what surrounds this office in Baltimore, based on OpenStreetMap data collected Sep 3, 2026. Parking is available about 413 ft away. There is EV charging 0.40 mi from the office (Blink) — useful if you are driving in from out of town. The nearest transit stop is 0.24 mi away, served by Eastern Avenue & Bonsal Street Far-side Eastbound. A pharmacy sits 0.34 mi from the entrance (BMS Pharmacy), which helps if you leave with a prescription. If you arrive early, there is a coffee shop 0.32 mi away.
Getting here and what is nearby
Parking East Parking Garage 250 ft ~1 min
Parking 317 ft ~2 min
Transit Mason Lord Drive & Bayview Medical Offices 351 ft ~2 min
Parking 413 ft ~2 min
Pharmacy Johns Hopkins Outpatient Pharmacy 588 ft ~3 min
4940 Eastern Avenue, Baltimore 21224
Coffee J.C. Romero's Neighborhood Cafe 656 ft ~3 min
Gas station Marathon 0.22 mi ~5 min
5802 Eastern Avenue, Baltimore 21224
Grocery Koko Market 0.22 mi ~5 min
6020 Eastern Avenue, Baltimore 21224
Mo-Sa 09:00-22:00, Su 09:00-21:00
Transit Eastern Avenue & Anglesea Street Westbound 0.24 mi ~5 min
Transit Eastern Avenue & Bonsal Street Far-side Eastbound 0.24 mi ~5 min
Restaurant Seasons Pizza 0.25 mi ~6 min
Gas station Royal Farms 0.27 mi ~6 min
Restaurant Nékter Juice Bar 0.28 mi ~6 min
Restaurant Panda Express 0.28 mi ~6 min
5709 Eastern Avenue, Baltimore 21224
Mo-Sa 10:00-22:00; Su 10:30-21:30
Convenience Royal Farms 0.29 mi ~6 min
5801 Eastern Avenue, Baltimore 21224
Coffee Starbucks 0.32 mi ~7 min
Pharmacy BMS Pharmacy 0.34 mi ~7 min
EV charging Blink 0.36 mi ~8 min
Convenience 7-Eleven 0.36 mi ~8 min
Grocery Streets Market 0.37 mi ~8 min
5701 Fleet Street, Baltimore 21224
Mo-Su 08:00-22:00
EV charging Blink 0.40 mi ~9 min
Convenience Tiger Mart 0.44 mi ~9 min
6408 Eastern Avenue, Baltimore 21224
Gas station Exxon 0.44 mi ~9 min
Grocery Save Mart 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
NPPES does not list a state licence number for this record. That is not unusual — organizations and some provider types are not required to file one. Verify current licensure with the relevant state board before care.
- Status
- Approved
- Provider type
- Order And Referring Only - Psychiatry
- PAC ID
- 4486015013
- Enrollment ID
- I20230731000714
Medicare enrolment is recorded as approved under the provider type Order And Referring Only - Psychiatry. Being enrolled means the provider can bill Medicare; it does not tell you whether they are currently accepting new Medicare patients. Call the office to confirm.
What Student in an Organized Health Care Education/Training Program covers
An individual who is enrolled in an organized health care education/training program leading to a degree, certification, registration, and/or licensure to provide health care. NUCC Health Care Provider Taxonomy, code 390200000X
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 | 1003550633 valid check digit |
|---|---|
| Entity type | Individual (NPI-1) |
| Enumeration date | Apr 20, 2022 |
| Last updated | Apr 20, 2022 |
| Status | Active |
| Sole proprietor | No |
| Gender | Male |
| Credential | MD, MPH |
| Practice address |
4940 EASTERN AVE Baltimore, MD 21224 (410) 550-0100 |
| Mailing address |
20216 WILLOWBEND LN Parker, CO 80138 |
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 | 5 | 5 | 0 | 6 | 3 |
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
| Doubled? | — | ×2 | — | ×2 | — | ×2 | — | ×2 | — | ×2 | — | ×2 | — | ×2 |
| Value | 8 | 0 | 8 | 8 | 0 | 2 | 0 | 0 | 3 | 1 | 5 | 0 | 6 | 6 |
Sum = 47 · next multiple of 10 = 50 · check digit = 3 · actual last digit = 3
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.