Diane Sizer, PH.D.
Psychologist · Southampton, PA
Diane Sizer, PH.D. is a psychologist with a practice address in Southampton, Pennsylvania, and NPI 1265478259, issued on Jun 20, 2006. Check the license (Pennsylvania PS008239L, as entered in NPPES) with the Pennsylvania board that licenses this profession; the Medicare figures below come from public CMS files.
- Name
- Diane Sizer
- Credential
- PH.D.
- Primary taxonomy
- Psychologist 103T00000X
- License numbers
- PS008239L PA
PS-008239-L PA
Self-reported in NPPES; status is on the state search - Practice location
- 928 Jaymor RD Ste B-150, Southampton, PA 18966
- Phone
- (215) 947-8654
- Enumerated
- Jun 20, 2006
- Record last updated
- Jul 3, 2024
- Fax
- (215) 938-7607
- Medicare enrollment
- Enrolled (PECOS I20171211002715); accepts Medicare assignment
- Entity
- Type 1 · individual
8 nearest psychologist records → All 2,687 in Pennsylvania → Look up another NPI →
Also registered at 928 Jaymor RD Ste B-150
A shared address usually means a shared clinic or building; it does not show who employs whom.
- Allison Abraham, PSY.D.Clinical Psychologist1164016929
- Tamara April-Davis, PSY.D.Clinical Psychologist1457921835
- Cristina Bannon, PSYDPsychologist1891591715
- Justin BennerClinical Social Worker1285033266
- Kali Carrara, PSY.D.Clinical Psychologist1538041272
- Katelyn CoffeyClinical Psychologist1619375490
Verify Diane Sizer in five checks
- 1IdentityNPI record in CMS NPPESNPI lookupConfirmed in NPPES
- 2LicenseActive license and public ordersWhich Pennsylvania board licenses this profession
Search for license PS008239LCheck 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
- Growth Opportunity CenterSouthampton, PA
Source: CMS Doctors and Clinicians National Downloadable File (the group practices a clinician bills Medicare through) (data.cms.gov).
Diane Sizer among 2,687 psychologist records in Pennsylvania
Diane Sizer, PH.D. is one of 2,687 psychologist records with a practice address in Pennsylvania. 13% of them appear in a Medicare file (Part D prescribing, MIPS, Open Payments or Medicare group billing); this one does. Its NPI, issued in 2006, is newer than 4% of them.
- NPI issued2006 · 4% of these records are older, 67% newer
- In a Medicare fileYes · 13% of these records are
- In the CMS Doctors and Clinicians fileYes · 22% of these records are
- Graduated1993 · median 2004 among the 585 with a school on file
- Record last updated2024 · 70% 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 Pennsylvania practice address; Medicare files: CMS Part D Prescribers 2024, MIPS 2023, Open Payments 2024, Doctors and Clinicians (data.cms.gov).
12 psychologist records list a practice address in Southampton
They are 12 of the 375 NPPES records with a practice address in Southampton, and 2,687 psychologist records in Pennsylvania.
All 2,687 in Pennsylvania → Every provider in Southampton → Psychologist nationwide →
The 8 psychologist records with the nearest ZIP codes
- Cristina Bannon, PSYDSouthampton, PA 189661891591715
- Morgan CaioneHolland, PA 189661598502742
- Joan Feinstein, PHD, JDSouthampton, PA 189661700055522
- Linda GreenbergSouthampton, PA 189661861860835
- Brittany Kennedy, PHDSouthampton, PA 189661689214231
- Stuart Kranson, MASouthampton, PA 189661851468698
- Faye Lovrinic, PSY.D.Southampton, PA 189661194925610
- Angelika Montalbano, PSYDSouthampton, PA 189661174030191
Common questions
What is Diane Sizer, PH.D.'s NPI number?
Diane Sizer, PH.D.'s National Provider Identifier (NPI) is 1265478259, issued on Jun 20, 2006. An NPI identifies a provider in billing; it is not a license.
Where is Diane Sizer, PH.D. located?
The NPPES record lists a practice address at 928 Jaymor RD Ste B-150, Southampton, PA, 18966. Phone: (215) 947-8654. Providers update this record themselves, so call before visiting.
How can I verify Diane Sizer, PH.D.'s license?
NPPES lists Pennsylvania license number PS008239L, 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.
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.