William Winn, ED.D
William Winn, ED.D is a Psychologist in Boston, MA, registered under NPI 1003053810. 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 Boston, based on OpenStreetMap data collected Sep 2, 2026. Parking is available about 0.32 mi away at Pilot House Parking. There is EV charging 0.34 mi from the office (ChargePoint) — useful if you are driving in from out of town. The nearest transit stop is 347 ft away, served by Aquarium Station - Outbound. A pharmacy sits 0.46 mi from the entrance (CVS Pharmacy), which helps if you leave with a prescription. If you arrive early, there is a coffee shop 0.20 mi away.
Getting here and what is nearby
Restaurant Legal Sea Foods 165 ft ~1 min
Su-Th 11:00-22:00; Fr,Sa 11:00-23:00
Coffee Koko Coffee 245 ft ~1 min
Mo-Su 07:00-19:00
Restaurant Harborview Cafe 261 ft ~1 min
Mo-Fr 09:00-16:00; Sa-Su 09:00-17:00
Restaurant State Street Provisions 267 ft ~2 min
Mo-Th 11:00-00:00, Fr 11:00-01:00, Sa 10:00-01:00, Su 09:00-00:00
Transit Atlantic Ave @ State St-Marriot Hotel 318 ft ~2 min
Transit Atlantic Ave @ Milk St 332 ft ~2 min
Hotel Boston Marriott Long Wharf 295 ft ~2 min
Transit Aquarium Station - Outbound 347 ft ~2 min
Parking Harbor Garage 392 ft ~2 min
Hotel Harborside Inn 643 ft ~3 min
Convenience 7-Eleven 708 ft ~3 min
Hotel Marriott Vacation Club Pulse® at Custom House 870 ft ~4 min
Coffee Starbucks 1,006 ft ~4 min
30 Rowes Wharf, Boston 02110
Mo-Fr 05:30-19:00; Sa 06:00-20:00; Su 06:00-19:00
Coffee Starbucks 0.20 mi ~4 min
Grocery Golden Goose Market 0.23 mi ~5 min
Grocery Pepper Palace 0.24 mi ~5 min
Parking Dock Square Parking Garage 0.25 mi ~5 min
20-30 Clinton Street, Boston 02109
Parking Pilot House Parking 0.32 mi ~7 min
2 Atlantic Avenue, Boston 02109
Mo-We 07:00-23:30; Th 07:00-01:00; Fr-Sa 07:00-02:00; Su 08:00-23:00
EV charging ChargePoint 0.34 mi ~7 min
Pharmacy CVS Pharmacy 0.35 mi ~8 min
Convenience BNC Market 0.38 mi ~8 min
226 Washington Street
Convenience Going Bananas 0.40 mi ~8 min
64 Salem Street, Boston 02113
Pharmacy CVS Pharmacy 0.46 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 |
|---|---|---|
| 2958 | MA | Psychologist primary |
This provider holds licence 2958 issued in MA. 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 Psychologist covers
A psychologist is an individual who is licensed to practice psychology which is defined as the observation, description, evaluation, interpretation, and modification of human behavior by the application of psychological principles, methods, and procedures, for the purpose of preventing or eliminating symptomatic, maladaptive, or undesired behavior and of enhancing interpersonal relationships, work and life adjustment, personal effectiveness, behavioral health, and mental health. The practice of psychology includes, but is not limited to, psychological testing and the evaluation or assessment of personal characteristics, such as intelligence, personality, abilities, interests, aptitudes, and neuropsychological functioning; counseling, psychoanalysis, psychotherapy, hypnosis, biofeedback, and behavior analysis and therapy; diagnosis and treatment of mental and emotional disorder or disability, alcoholism and substance abuse, disorders of habit or conduct, as well as of the psychological aspects of physical illness, accident, injury, or disability; and psycheducational evaluation, therapy, remediation, and consultation. Psychological services may be rendered to individuals, families, groups and the public. NUCC Health Care Provider Taxonomy, code 103T00000X
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 | 1003053810 valid check digit |
|---|---|
| Entity type | Individual (NPI-1) |
| Enumeration date | Jan 15, 2009 |
| Last updated | Jan 15, 2009 |
| Status | Active |
| Sole proprietor | Yes |
| Gender | Male |
| Credential | ED.D |
| Practice address |
66 LONG WHARF Boston, MA 02110 (617) 624-3340 Fax (617) 523-8197 |
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 | 3 | 8 | 1 |
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
| Doubled? | — | ×2 | — | ×2 | — | ×2 | — | ×2 | — | ×2 | — | ×2 | — | ×2 |
| Value | 8 | 0 | 8 | 8 | 0 | 2 | 0 | 0 | 3 | 0 | 5 | 6 | 8 | 2 |
Sum = 50 · next multiple of 10 = 50 · check digit = 0 · actual last digit = 0
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.