Alexandra Williams, LCDC
Alexandra Williams, LCDC is an Addiction (Substance Use Disorder) Counselor in Mckinney, TX, registered under NPI 1003757196.
Getting there
Here is what surrounds this office in Mckinney, based on OpenStreetMap data collected Oct 24, 2026. Parking is available about 681 ft away at LOT B.
Getting here and what is nearby
Parking 476 ft ~2 min
Parking LOT C 521 ft ~2 min
Parking LOT B 681 ft ~3 min
Restaurant Fontina Ristorante 0.24 mi ~5 min
216 East Virginia Street
Tu-Th 11:00-21:00; Fr-Sa 11:00-22:00; Su 11:00-20:00
Restaurant Harvest at the Masonic 0.28 mi ~6 min
215 North Kentucky Street
Tu-Th 17:00-22:30; Fr 05:00-24:00; Sa 10:30-14:30,17:00-24:00
Restaurant Urban Grill & Wine Bar 0.29 mi ~6 min
218 East Louisiana Street
Mo 16:00-21:00; Tu-Th 11:00-21:00; Fr 11:00-22:00; Sa 10:00-22:00; Su 10:00-21:00
Hotel Grand Hotel 0.34 mi ~7 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 |
|---|---|---|
| 17585 | TX | Addiction (Substance Use Disorder)… primary |
This provider holds licence 17585 issued in TX. 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 | 1003757196 valid check digit |
|---|---|
| Entity type | Individual (NPI-1) |
| Enumeration date | Apr 2, 2026 |
| Last updated | Apr 2, 2026 |
| Status | Active |
| Sole proprietor | No |
| Gender | Female |
| Credential | LCDC |
| Practice address |
405 N MCDONALD ST STE B Mckinney, TX 75069 (972) 542-4144 Fax (972) 542-4154 |
| Mailing address |
8444 N 90TH ST STE 100 Scottsdale, AZ 85258 |
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 | 7 | 5 | 7 | 1 | 9 |
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
| Doubled? | — | ×2 | — | ×2 | — | ×2 | — | ×2 | — | ×2 | — | ×2 | — | ×2 |
| Value | 8 | 0 | 8 | 8 | 0 | 2 | 0 | 0 | 3 | 5 | 5 | 5 | 1 | 9 |
Sum = 54 · next multiple of 10 = 60 · check digit = 6 · actual last digit = 6
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.