Quick answers
- Where does David C. Greczek see patients?
- Medicare's clinician data lists 1 practice location in Smithtown, NY. Call before your visit to confirm the address.
- What is David C. Greczek's specialty?
- Medicare lists Physician Assistant as the primary specialty.
- Does David C. Greczek accept Medicare assignment?
- Yes. Medicare's clinician data says David C. Greczek 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 David C. Greczek offer telehealth?
- Medicare's clinician data says David C. Greczek offers telehealth services. Ask the office which visits can be done by video or phone.
- What is the phone number for David C. Greczek?
- (631) 751-3000, as listed in official Medicare / NPI Registry data.
- What is David C. Greczek's NPI number?
- 1649990060. 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 David C. Greczek is enrolled with Medicare (CMS data updated 2026-10-02).
- 48 Route 25aSmithtown, NY 11787 (631) 751‑3000
Group practices
Medicare enrollment lists David C. Greczek as a member of this group (CMS data updated 2026-10-02).
- North Shore Hematology Oncology Associates PC479 clinicians in the group
Specialties
- Physician Assistantprimary
Other physician assistants in Smithtown
Clinicians with the same Medicare primary specialty in Smithtown, NY — not a recommendation.
Clinician information
| Credential | PA |
|---|---|
| Graduation year | 2022 |
| Gender (as listed) | Male |
| Medicare assignment | Accepts (Medicare-approved amount as full payment) |
| Telehealth | Offers telehealth services |
| NPI (National Provider Identifier) | 1649990060 |
| 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