Patrick Grehan, PH.D.
NPI 1407924368 · Clinical Psychologist · Garden City, NY
Enrolled with Medicare as Practitioner - Clinical Psychologist · source: CMS PECOS Public Provider Enrollment (2026.04.01)
Patrick Grehan, PH.D. is a Clinical Psychologist provider in Garden City, NY (NPI 1407924368).
Provider details
- NPI number
- 1407924368
- Entity type
- Individual
- Primary specialty
- Clinical PsychologistBehavioral Health & Social Service Providers
- Credential
- PH.D.
- Sex
- Male
- Sole proprietor
- Yes
- License
- 014194 (NY)
Specialties & taxonomies
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
1 documented practice location
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
Registry dates
- Enumerated
- 2006-11-30
- Last updated
- 2013-06-21
Frequently asked questions
- What is Patrick Grehan's NPI number?
- Patrick Grehan's National Provider Identifier (NPI) is 1407924368, a unique 10-digit ID issued by CMS for use in standard healthcare transactions.
- What is Patrick Grehan's specialty?
- Patrick Grehan is listed in the NPPES registry with a primary specialty of Clinical Psychologist (Behavioral Health & Social Service Providers).
- Where is Patrick Grehan located?
- Patrick Grehan's practice location on file with NPPES is 721 Franklin Ave, Garden City, NY 11530-4524.
- What is Patrick Grehan's phone number?
- The practice phone number listed in the NPPES registry for Patrick Grehan is (516) 256-9250.
- Does Patrick Grehan accept Medicare?
- Patrick Grehan is approved to bill Medicare according to CMS PECOS enrollment data (2026.04.01). Confirm current participation with the provider before scheduling.
- Is Patrick Grehan's NPI active?
- Yes — Patrick Grehan's NPI (1407924368) is active in the NPPES registry as of the last update on 2013-06-21.
Source: CMS NPPES Data Dissemination (June 2026). NPI Central is not affiliated with CMS. Data is provided as-is from the public registry.