Dr. William J O'Brien, PSYD
Psychologist in Waltham, Massachusetts
1255740254- Practice location
- 105 Black Bear Dr Unit 1727, Waltham, MA 02451-0226
- Phone
- 617-645-8761
- Fax
- 617-645-8761
- Last updated
- November 9, 2026
William J. A. O'Brien is a Psychologist based in Waltham, MA. William J. A. O'Brien practices in Waltham, MA and has the professional credentials of PSYD. The NPI Number for William J. A. O'Brien is 1255740254. The current practice location address for William J. A. O'Brien is 105 Black Bear Dr Unit 1727, Waltham, MA 02451-0226 and can be reached out via phone at 617-645-8761 and via fax at 617-645-8761.
Provider Profile Details
- NPI Number
- 1255740254
- Provider Name
- William J. A. O'Brien
- Credential
- PSYD
- Provider Entity Type
- Individual
- Gender
- Male
- Address
- 105 Black Bear Dr Unit 1727, Waltham, MA 02451-0226
- Phone Number
- 617-645-8761
- Fax Number
- 617-645-8761
- Primary Taxonomy
- Psychologist · 103T00000X
- Sole Proprietor
- No
- Provider Enumeration Date
- August 5, 2014
- Last Update Date
- November 9, 2026
- Certification Date
- November 9, 2026
- NPI Status
- Active
Provider Business Practice Location Address Details
- Address
- 105 Black Bear Dr Unit 1727
Waltham, MA 02451-0226 - City
- Waltham
- State
- Massachusetts
- Zip
- 02451-0226
- Phone Number
- 617-645-8761
- Fax Number
- 617-645-8761
Provider Business Mailing Address Details
- Address
- 105 Black Bear Dr Unit 1727
Waltham, MA 02451-0226 - City
- Waltham
- State
- MA
- Zip
- 02451-0226
- Phone Number
- 617-645-8761
- Fax Number
- 617-645-8761
License Information
- Taxonomy
- Psychologist · 103T00000X · Primary
Legacy Identifiers
| Identifier | Type | State | Issuer |
|---|---|---|---|
| No legacy identifiers (Medicaid, Medicare or plan IDs) are on file for this provider. | |||
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- Dr. Carolyn E Cote, BA, MA, PSYDPsychologist · NPI 1316273006
- Dr. Nicholas A Rotolo, PSYDPsychologist · NPI 1932587078
- Dr. Roberta Caplan, PHDPsychologist · NPI 1801936497
Frequently Asked Questions
What is the NPI number of Dr. William J O'Brien, PSYD?
The NPI number of Dr. William J O'Brien, PSYD is 1255740254. It was assigned on August 5, 2014 and is currently active in the NPPES registry.
What is the specialty of Dr. William J O'Brien, PSYD?
Dr. William J O'Brien, PSYD is registered under the primary taxonomy Psychologist (code 103T00000X).
Where does Dr. William J O'Brien, PSYD practice?
The practice location is 105 Black Bear Dr Unit 1727, Waltham, MA 02451-0226. The office can be reached at 617-645-8761 (phone) or 617-645-8761 (fax).
What is an NPI number?
A National Provider Identifier (NPI) is a unique 10-digit identification number issued to health care providers in the United States by the Centers for Medicare and Medicaid Services (CMS). It is used in HIPAA standard transactions.
How do I verify this NPI record?
This record is sourced from the public NPPES NPI Registry maintained by CMS. You can confirm it by searching NPI 1255740254 directly on the NPPES registry website.