Derek Thamarus
Derek Thamarus is a Registered Nurse in Detroit, MI, registered under NPI 1003536541. 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 Detroit, based on OpenStreetMap data collected Sep 21, 2026. Parking is available about 783 ft away at DMC North Deck. There is EV charging 0.38 mi from the office (Wayne State University - Parking Structure #6) — useful if you are driving in from out of town. The nearest transit stop is 603 ft away, served by Gratiot / Brush NS (WB). A pharmacy sits 0.32 mi from the entrance (Midtown Rx Pharmacy), which helps if you leave with a prescription. If you arrive early, there is a coffee shop 0.37 mi away.
Getting here and what is nearby
Parking VA Blue Parking Deck 471 ft ~2 min
399 East Canfield Street, Detroit 48201
Transit Canfield / Brush (WB) 528 ft ~2 min
Transit Gratiot / Brush NS (EB) 592 ft ~3 min
Transit Gratiot / Brush NS (WB) 603 ft ~3 min
Parking WSU Lot 75 629 ft ~3 min
545 East Canfield Street, Detroit 48201
Parking DMC North Deck 783 ft ~3 min
232 East Canfield Street, Detroit 48201
Restaurant Seva 779 ft ~3 min
Restaurant Savvy Sliders 986 ft ~4 min
4664 Woodward Avenue, Detroit 48201
Pharmacy CVS Pharmacy 0.20 mi ~4 min
Restaurant Subway 0.20 mi ~4 min
4201 Street, Detroit 48201
Mo-Fr 09:00-21:00; Sa 10:00-16:00
Grocery Food Pride Super Market 0.22 mi ~5 min
500 East Warren Avenue, Detroit 48201
Coffee Hannan Cafe 0.23 mi ~5 min
Gas station Shell 0.24 mi ~5 min
4661 Woodward Avenue, Detroit 48201
Pharmacy Knight Drugs 0.24 mi ~5 min
Convenience Shell Shop 0.25 mi ~5 min
EV charging Wayne State University - Parking Structure #8 0.28 mi ~6 min
Pharmacy Midtown Rx Pharmacy 0.32 mi ~7 min
4100 Woodward Avenue, Detroit 48201
Coffee Cass Cafe 0.34 mi ~7 min
Convenience Marathon 0.36 mi ~8 min
714 East Warren Avenue, Detroit 48201
Coffee The Red Hook - Midtown 0.37 mi ~8 min
3965 Woodward Avenue, Detroit 48201
Mo-Fr 07:00-17:00; Sa 08:00-17:00; Su 09:00-14:00
Gas station Marathon 0.37 mi ~8 min
714 East Warren Avenue, Detroit 48201
EV charging Wayne State University - Parking Structure #6 0.38 mi ~8 min
Convenience Marcus Market 0.46 mi ~10 min
4606 2nd Avenue, Detroit 48201
Gas station Mobil 0.49 mi ~10 min
Grocery Whole Foods Market 0.50 mi ~11 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 |
|---|---|---|
| 4704226619 | MI | Registered Nurse primary |
This provider holds licence 4704226619 issued in MI. 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 Registered Nurse covers
(1) A registered nurse is a person qualified by graduation from an accredited nursing school (depending upon schooling, a registered nurse may receive either a diploma from a hospital program, an associate degree in nursing (A.D.N.) or a Bachelor of Science degree in nursing (B.S.N.), who is licensed or certified by the state, and is practicing within the scope of that license or certification. R.N.'s assist patient in recovering and maintaining their physical or mental health. They assist physicians during treatments and examinations and administer medications. (2) A provider who is trained and educated in a formal nursing education program at an accredited school of nursing, passes a national certification examination, and is licensed by the state to practice nursing. The individual provides nursing services to patients or clients in areas such as health promotion, disease prevention, acute and chronic care and restoration and maintenance of health across the life span. NUCC Health Care Provider Taxonomy, code 163W00000X
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 | 1003536541 valid check digit |
|---|---|
| Entity type | Individual (NPI-1) |
| Enumeration date | Sep 2, 2022 |
| Last updated | Sep 2, 2022 |
| Status | Active |
| Sole proprietor | Yes |
| Gender | Male |
| Practice address |
4646 JOHN R ST Detroit, MI 48201 (313) 576-1294 |
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 | 3 | 6 | 5 | 4 |
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
| Doubled? | — | ×2 | — | ×2 | — | ×2 | — | ×2 | — | ×2 | — | ×2 | — | ×2 |
| Value | 8 | 0 | 8 | 8 | 0 | 2 | 0 | 0 | 3 | 1 | 3 | 3 | 5 | 8 |
Sum = 49 · next multiple of 10 = 50 · check digit = 1 · actual last digit = 1
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.