Dahra Williams, PH.D.
Dahra Williams, PH.D. is a Clinical Psychologist in Hockessin, DE, registered under NPI 1003055427. 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 Hockessin, based on OpenStreetMap data collected Sep 2, 2026. Parking is available about 0.48 mi away at Pidmont Baseball. The nearest transit stop is 0.36 mi away. If you arrive early, there is a coffee shop 0.26 mi away.
Getting here and what is nearby
Restaurant Stone Mill Pizza 0.21 mi ~5 min
7313 Lancaster Pike, Hockessin 19707
We,Th,Su 12:00-20:00; Fr-Sa 12:00-21:00
Transit 0.23 mi ~5 min
Coffee Quinn's Cafe 0.26 mi ~6 min
7288 Lancaster Pike
Mo-Fr 07:00-15:00; Sa-Su 07:00-14:00
Restaurant Mexican Table Restaurant 0.26 mi ~6 min
7288 Lancaster Pike, Hockessin 19707
Su,Mo,Tu 11:00-21:00; We-Sa 11:00-22:00
Grocery Harvest Market Natural Foods 0.30 mi ~6 min
7417 Lancaster Pike, Hockessin 19707
Mo-Sa 08:00-20:00; Su 09:00-18:00
Transit 0.36 mi ~8 min
Restaurant George & Sons Seafood Market 0.37 mi ~8 min
1216 Old Lancaster Pike, Hockessin
Gas station Shell 0.38 mi ~8 min
Convenience Wawa 0.40 mi ~8 min
Parking 0.42 mi ~9 min
Grocery Chefs’ Haven 0.43 mi ~9 min
1304 Old Lancaster Pike, Hockessin
Mo,Su off; Tu-We,Fr 10:00-15:00; Th 10:00-17:00; Sa 09:00-13:00
Parking 0.48 mi ~10 min
Parking Pidmont Baseball 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 |
|---|---|---|
| B1-0000798 | DE | Clinical Psychologist primary |
This provider holds licence B1-0000798 issued in DE. 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 Clinical covers
A psychologist who provides continuing and comprehensive mental and behavioral health care for individuals and families; consultation to agencies and communities; training, education and supervision; and research-based practice. It is a specialty in breadth -- one that is broadly inclusive of severe psychopathology -- and marked by comprehensiveness and integration of knowledge and skill from a broad array of disciplines within and outside of psychology proper. The scope of clinical psychology encompasses all ages, multiple diversities and varied systems. NUCC Health Care Provider Taxonomy, code 103TC0700X
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 | 1003055427 valid check digit |
|---|---|
| Entity type | Individual (NPI-1) |
| Enumeration date | Feb 9, 2009 |
| Last updated | Feb 9, 2009 |
| Status | Active |
| Sole proprietor | Yes |
| Gender | Female |
| Credential | PH.D. |
| Practice address |
710 YORKLYN ROAD Hockessin, DE 19707 (302) 238-5255 Fax (302) 239-5531 |
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 | 5 | 5 | 4 | 2 |
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
| Doubled? | — | ×2 | — | ×2 | — | ×2 | — | ×2 | — | ×2 | — | ×2 | — | ×2 |
| Value | 8 | 0 | 8 | 8 | 0 | 2 | 0 | 0 | 3 | 0 | 5 | 1 | 4 | 4 |
Sum = 43 · next multiple of 10 = 50 · 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.