Diane Sizer, PH.D.
NPI 1265478259 · Psychologist · Southampton, PA
Enrolled with Medicare as Practitioner - Clinical Psychologist · source: CMS PECOS Public Provider Enrollment (2026.04.01)
Diane Sizer, PH.D. is a Psychologist provider in Southampton, PA (NPI 1265478259).
Provider details
- NPI number
- 1265478259
- Entity type
- Individual
- Primary specialty
- PsychologistBehavioral Health & Social Service Providers
- Credential
- PH.D.
- Sex
- Female
- Sole proprietor
- No
- License
- PS-008239-L (PA)
Specialties & taxonomies
Behavioral Health & Social Service Providers
Behavioral Health & Social Service Providers
Profile Score
A profile completeness & documented-activity index — NOT a quality, outcomes, or patient-satisfaction rating.
- Registry tenure38% of score
19 yrs in NPPES registry
- Profile completeness38% of score
100% of core fields populated
- Practice footprint23% of score
2 documented practice locations
Signals a provider has no public data for (e.g. Medicare claims) are left out of the score entirely — never counted as zero — so providers without that data are not penalized. See the full formula and weights in our methodology.
Practice location
Mailing address
Additional practice locations (1)
- 928 Jaymor Rd Ste B-150Southampton, PA 18966-3853Phone: (856) 745-9579Fax: (215) 938-7607
Registry dates
- Enumerated
- 2006-06-20
- Last updated
- 2024-07-03
- Certified
- 2024-07-03
Frequently asked questions
- What is Diane Sizer's NPI number?
- Diane Sizer's National Provider Identifier (NPI) is 1265478259, a unique 10-digit ID issued by CMS for use in standard healthcare transactions.
- What is Diane Sizer's specialty?
- Diane Sizer is listed in the NPPES registry with a primary specialty of Psychologist (Behavioral Health & Social Service Providers).
- Where is Diane Sizer located?
- Diane Sizer's practice location on file with NPPES is 928 Jaymor Rd Ste B-150, Southampton, PA 18966-3853.
- What is Diane Sizer's phone number?
- The practice phone number listed in the NPPES registry for Diane Sizer is (215) 947-8654.
- Does Diane Sizer accept Medicare?
- Diane Sizer is approved to bill Medicare according to CMS PECOS enrollment data (2026.04.01). Confirm current participation with the provider before scheduling.
- Is Diane Sizer's NPI active?
- Yes — Diane Sizer's NPI (1265478259) is active in the NPPES registry as of the last update on 2024-07-03.
Source: CMS NPPES Data Dissemination (June 2026). NPI Central is not affiliated with CMS. Data is provided as-is from the public registry.