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Recently Updated NPI Information — some details in this NPI profile have been updated in the NPI registry within the last 60 days.

DR. GUNNAR MARK SWIERKOWSKI
NPI 1831796895
Pharmacist in Massapequa, NY

Active since October 02, 2020
4638 MERRICK RD, MASSAPEQUA, NY 11758(516) 688-0488(516) 688-0489 Get Directions Write a Review

NPPES record last updated: October 20, 2026. Verified against the NPPES registry weekly; last sync: November 01, 2026.

Record update history: Mar 3, 2025, Oct 2, 2020 (2 updates tracked since 2020).

About Dr. Gunnar Mark Swierkowski NPPES

Official registry information on file with the National Plan and Provider Enumeration System.

DR. GUNNAR MARK SWIERKOWSKI (NPI 1831796895) is an individual pharmacist in Massapequa, New York, licensed in New York (067038) and active in the NPI registry since October 2020.

NPPES Registry Identity

NPI1831796895
Entity TypeIndividualMale
Primary Taxonomy183500000X
Provider Legal NameDR. GUNNAR MARK SWIERKOWSKI
Location Address4638 MERRICK RDMassapequa, NY 11758-6030
Mailing Address35 Brewster Rd WMassapequa, NY 11758-8021 · (516) 498-7817 · Fax (516) 688-0489
Phone(516) 688-0488
Fax(516) 688-0489
Sole ProprietorYes
Enumeration DateOctober 2, 2020
Last NPPES UpdateOctober 20, 20262 updates tracked since enumeration
NPPES CertifiedOctober 20, 2026
✔ NPI 1831796895 is a valid, active identifier and passes the ISO check-digit test.

Specialties & Licenses

★ Primary SpecialtyPharmacistPharmacy Service Providers
Taxonomy Code183500000X
License✔ Licensed in NY · 067038
Definition
An individual licensed by the appropriate state regulatory agency to engage in the practice of pharmacy. The practice of pharmacy includes, but is not limited to, assessment, interpretation, evaluation, and implementation, initiation, monitoring or modification of medication and or medical orders; the compounding or dispensing of medication and or medical orders; participation in drug and device procurement, storage, and selection; drug administration; drug regimen reviews; drug or drug-related research; provision of patient education and the provision of those acts or services necessary to provide medication therapy management services in all areas of patient care.
4638 MERRICK RD, Massapequa, NY 11758
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Other Providers at the Same Location NPPES 2

Providers registered at the same practice address, or within the immediate area, according to the NPPES registry.

R&R DRUG CO. INC. OF MASSAPEQUA
Pharmacy (Community/Retail Pharmacy)
4638 MERRICK RD
MASSAPEQUA, NY 11758
Nassau County (516) 798-2050
BILTMORE FAMILY PHARMACY INC.
Pharmacy (Community/Retail Pharmacy)
4638 MERRICK RD
MASSAPEQUA, NY 11758
Nassau County (516) 498-7817

Frequently Asked Questions NPPES & CMS

Common questions about this NPI record, answered from the official NPPES registry and CMS datasets shown on this page.

What is Gunnar Swierkowski's NPI number?

The NPI number for Gunnar Swierkowski is 1831796895. It was assigned to this individual provider in the NPPES registry on October 2, 2020.

Where is Gunnar Swierkowski located?

Gunnar Swierkowski practices at 4638 Merrick Rd, Massapequa, NY 11758. The listed phone number is (516) 688-0488.

What is Gunnar Swierkowski's specialty?

The primary specialty registered for this NPI is Pharmacist with taxonomy code 183500000X.

When was this NPI record last updated?

The NPPES record for Gunnar Swierkowski was last updated on October 20, 2026. NPI Profile syncs weekly with the NPPES registry data releases published by CMS. This NPI record was last updated 17 days ago. If this record has changed at CMS more recently, you can request an on-demand re-check against the live CMS registry, directly from this page.