Quick answers
- Where does Fred B. Krellenstein see patients?
- Medicare's clinician data lists 1 practice location in Syosset, NY. Call before your visit to confirm the address.
- What is Fred B. Krellenstein's specialty?
- Medicare lists Clinical Psychologist as the primary specialty.
- Does Fred B. Krellenstein accept Medicare assignment?
- Yes. Medicare's clinician data says Fred B. Krellenstein accepts Medicare assignment (the Medicare-approved amount as full payment for covered services), as of 2026-10-02. Ask the office to confirm before your visit.
- Does Fred B. Krellenstein offer telehealth?
- Medicare's clinician data says Fred B. Krellenstein offers telehealth services. Ask the office which visits can be done by video or phone.
- What is the phone number for Fred B. Krellenstein?
- (516) 921-3943, as listed in official Medicare / NPI Registry data.
- What is Fred B. Krellenstein's NPI number?
- 1538258058. The NPI (National Provider Identifier) is the clinician's permanent federal ID; you can look it up in the official NPI Registry.
Practice locations
Addresses where Fred B. Krellenstein is enrolled with Medicare (CMS data updated 2026-10-02).
- 8 Holly DrSyosset, NY 11791 (516) 921‑3943
Specialties
- Clinical Psychologistprimary
Other clinical psychologists in Syosset
Clinicians with the same Medicare primary specialty in Syosset, NY — not a recommendation.
Clinician information
| Graduation year | 1983 |
|---|---|
| Gender (as listed) | Male |
| Medicare assignment | Accepts (Medicare-approved amount as full payment) |
| Telehealth | Offers telehealth services |
| NPI (National Provider Identifier) | 1538258058 |
| Corrections | Report an error or suggest an update → |
Most corrections must be made at the source: clinicians update their NPI Registry record (NPPES) and their Medicare enrollment (PECOS); this page follows the next data release.
Sources
- National Downloadable File (Doctors and Clinicians) — CMS, data updated 2026-10-02, retrieved 2026-10-29
- NPI Registry — U.S. Department of Health and Human Services (NPPES), the clinician’s official record
- Medicare Care Compare — official Medicare tool to look up clinicians