Willis Wilkerson
Willis Wilkerson is an Addiction (Substance Use Disorder) Counselor in Annapolis, MD, registered under NPI 1003659517. 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 Annapolis, based on OpenStreetMap data collected Oct 12, 2026. Parking is available about 0.48 mi away. The nearest transit stop is 0.20 mi away, served by Bywater Rd. and Great Bay Ave.. A pharmacy sits 0.28 mi from the entrance (Safeway), which helps if you leave with a prescription.
Getting here and what is nearby
Transit Copeland Street 810 ft ~4 min
Transit Bywater Rd. and Belle Dr. 947 ft ~4 min
Transit Bywater Rd. and Great Bay Ave. 0.20 mi ~5 min
Gas station Carroll Motor Fuels 0.25 mi ~6 min
1824 Forest Drive
Restaurant Dunkin' 0.27 mi ~6 min
Pharmacy Safeway 0.28 mi ~6 min
Grocery Safeway 0.29 mi ~6 min
1781 Forest Drive, Annapolis 21401
Mo-Su 06:00-22:00
Gas station Citgo 0.41 mi ~9 min
502 Cherry Grove Avenue
Parking 0.42 mi ~9 min
Restaurant Ledo Pizza 0.46 mi ~10 min
505 Cherry Grove Avenue
Parking 0.48 mi ~10 min
Parking 0.48 mi ~10 min
Restaurant Shika Sushi and Ramen 0.48 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 |
|---|---|---|
| SC3237 | MD | Addiction (Substance Use Disorder)… primary |
This provider holds licence SC3237 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 Addiction (Substance Use Disorder) covers
Definition to come... NUCC Health Care Provider Taxonomy, code 101YA0400X
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 | 1003659517 valid check digit |
|---|---|
| Entity type | Individual (NPI-1) |
| Enumeration date | Jun 13, 2024 |
| Last updated | Jun 13, 2024 |
| Status | Active |
| Sole proprietor | Yes |
| Gender | Male |
| Practice address |
603 BROACH CT Annapolis, MD 21401 (443) 481-0208 |
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 | 6 | 5 | 9 | 5 | 1 |
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
| Doubled? | — | ×2 | — | ×2 | — | ×2 | — | ×2 | — | ×2 | — | ×2 | — | ×2 |
| Value | 8 | 0 | 8 | 8 | 0 | 2 | 0 | 0 | 3 | 3 | 5 | 9 | 5 | 2 |
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.