Michael Andrew Williston, PSY.D.
Psychologist · Wilmington, DE
Michael Andrew Williston, PSY.D. is a psychologist with a practice address in Wilmington, Delaware, and NPI 1093090474, issued on Oct 17, 2011. Check the license (Delaware B1-0011487, as entered in NPPES) with the Delaware board that licenses this profession; the Medicare figures below come from public CMS files.
- Name
- Michael Andrew Williston
- Credential
- PSY.D.
- Primary taxonomy
- Psychologist 103T00000X
- License numbers
- B1-0011487 DE
PS017269 PA
Self-reported in NPPES; status is on the state search - Practice location
- 4000 Nexus Dr Ste NE3-100, Wilmington, DE 19803
- Phone
- (302) 320-9771
- Enumerated
- Oct 17, 2011
- Record last updated
- Jan 13, 2025
- Fax
- (302) 623-7964
- Medicare enrollment
- Enrolled (PECOS I20250114000738); accepts Medicare assignment
- Telehealth
- Offers telehealth (CMS)
- Entity
- Type 1 · individual
8 nearest psychologist records → All 151 in Delaware → Look up another NPI →
Also registered at 4000 Nexus Dr Ste NE3-100
A shared address usually means a shared clinic or building; it does not show who employs whom.
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- Ashley Pipoli, PA-CPhysician Assistant1497388821
Verify Michael Andrew Williston in five checks
- 1IdentityNPI record in CMS NPPESNPI lookupConfirmed in NPPES
- 2LicenseActive license and public ordersWhich Delaware board licenses this profession
Search for license B1-0011487Check the board - 3Other statesLicenses and actions elsewhereDocInfo (FSMB)Not checked
- 4ExclusionsMedicare and Medicaid bansHHS-OIG exclusion listNot checked
- 5CertificationBoard certificationABMS AOA NCCPA AANPNot checked
Bills Medicare through one group practice
- Christiana Care Health Services IncWilmington, DE
Source: CMS Doctors and Clinicians National Downloadable File (the group practices a clinician bills Medicare through) (data.cms.gov).
Michael Andrew Williston among 151 psychologist records in Delaware
Michael Andrew Williston, PSY.D. is one of 151 psychologist records with a practice address in Delaware. 17% of them appear in a Medicare file (Part D prescribing, MIPS, Open Payments or Medicare group billing); this one does. Its NPI, issued in 2011, is newer than 56% of them.
- NPI issued2011 · 56% of these records are older, 42% newer
- In a Medicare fileYes · 17% of these records are
- In the CMS Doctors and Clinicians fileYes · 30% of these records are
- Graduated2011 · median 1999 among the 46 with a school on file
- Record last updated2025 · 68% of these records were not updated in five years or more
Source: CMS NPPES, file of Aug 9, 2026, every record with primary taxonomy 103T00000X and a Delaware practice address; Medicare files: CMS Part D Prescribers 2024, MIPS 2023, Open Payments 2024, Doctors and Clinicians (data.cms.gov).
80 psychologist records list a practice address in Wilmington
They are 80 of the 6,291 NPPES records with a practice address in Wilmington, and 151 psychologist records in Delaware.
All 151 in Delaware → Every provider in Wilmington → Psychologist nationwide →
The 8 psychologist records with the nearest ZIP codes
- Kathryn Bove, PHDWilmington, DE 198031518066463
- Leslie Connor, PH.D.Wilmington, DE 198031871641548
- Amy Diehl, PSY.D.Wilmington, DE 198031649399247
- Stephen Dijulio, PHDWilmington, DE 198031518925619
- Sharon Jacobs, PHDWilmington, DE 198031518066455
- Maidah Khalid-Janney, PSY.DWilmington, DE 198031538313242
- Christopher McGlinn, PHDWilmington, DE 198031093966574
- Hilna Moskowitz, PHDWilmington, DE 198031952400897
Common questions
What is Michael Andrew Williston, PSY.D.'s NPI number?
Michael Andrew Williston, PSY.D.'s National Provider Identifier (NPI) is 1093090474, issued on Oct 17, 2011. An NPI identifies a provider in billing; it is not a license.
Where is Michael Andrew Williston, PSY.D. located?
The NPPES record lists a practice address at 4000 Nexus Dr Ste NE3-100, Wilmington, DE, 19803. Phone: (302) 320-9771. Providers update this record themselves, so call before visiting.
How can I verify Michael Andrew Williston, PSY.D.'s license?
NPPES lists Delaware license number B1-0011487, as entered by the provider. Search the Delaware board that licenses this profession; the NPPES record confirms identity only.
Source: CMS National Plan and Provider Enumeration System (NPPES), file of Aug 9, 2026 (NPPES files on CMS.gov); NUCC Health Care Provider Taxonomy. Medicare files from data.cms.gov. An NPI identifies who bills; it is not a license.
Figures on PlainDoctor are read from the federal files each page names (CMS NPPES, Medicare Part D, MIPS, Open Payments; the HHS-OIG exclusion list only as counts) and from Census population estimates, with the file date shown beside them. See our editorial standards & corrections policy, the methodology behind these numbers, or report a data error. Data current as of Aug 9, 2026.