Dr. Fred Krellenstein, Psychologist, P.C.
NPI 1215293709 · Clinical Psychologist · Syosset, NY
Enrolled with Medicare as Part B Supplier - Clinic/Group Practice · source: CMS PECOS Public Provider Enrollment (2026.04.01)
Dr. Fred Krellenstein, Psychologist, P.C. is a Clinical Psychologist organization in Syosset, NY (NPI 1215293709).
Provider details
- NPI number
- 1215293709
- Entity type
- Organization
- Primary specialty
- Clinical PsychologistBehavioral Health & Social Service Providers
- Organization subpart
- No
- Authorized official
- Fred Krellenstein, President(516) 921-3943
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
14 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
- 2012-04-09
- Last updated
- 2013-07-17
Frequently asked questions
- What is Dr. Fred Krellenstein, Psychologist, P.C.'s NPI number?
- Dr. Fred Krellenstein, Psychologist, P.C.'s National Provider Identifier (NPI) is 1215293709, a unique 10-digit ID issued by CMS for use in standard healthcare transactions.
- What type of organization is Dr. Fred Krellenstein, Psychologist, P.C.?
- Dr. Fred Krellenstein, Psychologist, P.C. is classified in the NPPES registry as Clinical Psychologist (Behavioral Health & Social Service Providers).
- Where is Dr. Fred Krellenstein, Psychologist, P.C. located?
- Dr. Fred Krellenstein, Psychologist, P.C.'s practice location on file with NPPES is 8 Holly Dr, Syosset, NY 11791-5718.
- What is Dr. Fred Krellenstein, Psychologist, P.C.'s phone number?
- The practice phone number listed in the NPPES registry for Dr. Fred Krellenstein, Psychologist, P.C. is (516) 921-3943.
- Does Dr. Fred Krellenstein, Psychologist, P.C. accept Medicare?
- Dr. Fred Krellenstein, Psychologist, P.C. is approved to bill Medicare according to CMS PECOS enrollment data (2026.04.01). Confirm current participation with the provider before scheduling.
- Who is the authorized official for Dr. Fred Krellenstein, Psychologist, P.C.?
- The authorized official listed on Dr. Fred Krellenstein, Psychologist, P.C.'s NPPES record is Fred Krellenstein, President. The authorized official registers and maintains the organization's NPI and is not necessarily its owner.
- Is Dr. Fred Krellenstein, Psychologist, P.C.'s NPI active?
- Yes — Dr. Fred Krellenstein, Psychologist, P.C.'s NPI (1215293709) is active in the NPPES registry as of the last update on 2013-07-17.
Source: CMS NPPES Data Dissemination (June 2026). NPI Central is not affiliated with CMS. Data is provided as-is from the public registry.