NPPES file of Aug 9, 2026

Gregory Alan Seidel, PH.D.

Clinical Neuropsychologist · Philadelphia, PA

Gregory Alan Seidel, PH.D. is a clinical neuropsychologist with a practice address in Philadelphia, Pennsylvania, and NPI 1447602982, issued on Jul 8, 2016. Check the license (Pennsylvania PS018084, as entered in NPPES) with the Pennsylvania board that licenses this profession; the Medicare figures below come from public CMS files.

Record from CMS NPPES, file of Aug 9, 2026 · method · Verify with CMS →

NPPES recordNPPES file of Aug 9, 2026
1447602982
Name
Gregory Alan Seidel
Credential
PH.D.
Primary taxonomy
Clinical Neuropsychologist 103G00000X
License number
PS018084 PA
Self-reported in NPPES; status is on the state search
Practice location
909 Walnut St FL 2, Philadelphia, PA 19107
Phone
(215) 955-7952
Enumerated
Jul 8, 2016
Record last updated
Oct 14, 2021 (not updated in 5 years: call before relying on the address or phone)
Medicare enrollment
Enrolled (PECOS I20160907000461); accepts Medicare assignment
Telehealth
Offers telehealth (CMS)
Entity
Type 1 · individual
Public record from CMS NPPES (open it on the CMS NPI Registry). Enrollment, assignment, school and telehealth: CMS Doctors and Clinicians file, Aug 2026. A record is not a license: verify it with the state board.
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8 nearest clinical neuropsychologist records → All 234 in Pennsylvania → Look up another NPI →

Also registered at 909 Walnut St FL 2

A shared address usually means a shared clinic or building; it does not show who employs whom.

  1. Shaista Alam, MDNeurology Physician1700149895
  2. Iyad Alnahhas, M.D., M.S.Neurology Physician1922428333
  3. Carrie Andrews, MDStudent in an Organized Health Care Education/Training Program1932662012
  4. Crystal Benjamin, M.D.Family Medicine Physician1912260290
  5. Matthew Berk, M.D.Neurology Physician1750724498
  6. James Castiglione, MDStudent in an Organized Health Care Education/Training Program1336887298

Verify Gregory Alan Seidel in five checks

  1. 1IdentityNPI record in CMS NPPESNPI lookupConfirmed in NPPES
  2. 2LicenseActive license and public ordersWhich Pennsylvania board licenses this profession
    Search for license PS018084    Check the board
  3. 3Other statesLicenses and actions elsewhereDocInfo (FSMB)Not checked
  4. 4ExclusionsMedicare and Medicaid bansHHS-OIG exclusion listNot checked
  5. 5CertificationBoard certificationABMS AOA NCCPA AANPNot checked
Find the Pennsylvania license search

PlainDoctor does not match the HHS-OIG exclusion list to individual records: most entries carry no NPI. Search the OIG exclusion list by name.

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Bills Medicare through one group practice

  1. Jefferson University PhysiciansPhiladelphia, PA

Source: CMS Doctors and Clinicians National Downloadable File (the group practices a clinician bills Medicare through) (data.cms.gov).

Gregory Alan Seidel among 234 clinical neuropsychologist records in Pennsylvania

Gregory Alan Seidel, PH.D. is one of 234 clinical neuropsychologist records with a practice address in Pennsylvania. 34% of them appear in a Medicare file (Part D prescribing, MIPS, Open Payments or Medicare group billing); this one does. Its NPI, issued in 2016, is newer than 67% of them.

  • NPI issued2016 · 67% of these records are older, 29% newer
  • In a Medicare fileYes · 34% of these records are
  • In the CMS Doctors and Clinicians fileYes · 43% of these records are
  • Graduated2014 · median 2009 among the 101 with a school on file
  • Record last updated2021 · 64% of these records were not updated in five years or more

Source: CMS NPPES, file of Aug 9, 2026, every record with primary taxonomy 103G00000X and a Pennsylvania practice address; Medicare files: CMS Part D Prescribers 2024, MIPS 2023, Open Payments 2024, Doctors and Clinicians (data.cms.gov).

Clinical Neuropsychologist providers in Pennsylvania

There are 234 clinical neuropsychologist records in Pennsylvania.

All 234 in Pennsylvania → Every provider in Philadelphia → Clinical Neuropsychologist nationwide →

The 8 clinical neuropsychologist records with the nearest ZIP codes

  1. Laura Brennan, PH.D.Philadelphia, PA 191071316206311
  2. Kathryn Lester, PSY.D.Philadelphia, PA 191071205126976
  3. Abigail Lyon, PSY.D.Philadelphia, PA 191071134615388
  4. Gerri McGinnis, PHDPhiladelphia, PA 191071972523033
  5. Victoria Oleynick, PHDPhiladelphia, PA 191071629807169
  6. Jennifer Tinker, PH.D.Philadelphia, PA 191071013264449
  7. Joseph Tracy, PHDPhiladelphia, PA 191071386667905
  8. Chelsea Black, PH.D.Philadelphia, PA 191041023463106

Common questions

What is Gregory Alan Seidel, PH.D.'s NPI number?

Gregory Alan Seidel, PH.D.'s National Provider Identifier (NPI) is 1447602982, issued on Jul 8, 2016. An NPI identifies a provider in billing; it is not a license.

Where is Gregory Alan Seidel, PH.D. located?

The NPPES record lists a practice address at 909 Walnut St FL 2, Philadelphia, PA, 19107. Phone: (215) 955-7952. Providers update this record themselves, so call before visiting.

How can I verify Gregory Alan Seidel, PH.D.'s license?

NPPES lists Pennsylvania license number PS018084, as entered by the provider. Search the Pennsylvania 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.

Written with AI tools from the named public files; every figure is computed from those files (how it is made).

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.