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Type 1 · Individual ✓ Active NPI ✓ Valid NPI checksum

Dr. Mark Edward Swierczewski, DDS

General Practice Dentistry in Lancaster, PA · enumerated 2008 · practices at American Family Dental Care, P.C..

Data current as of Jul 13, 2026 · sourced from CMS NPPES

National Provider Identifier

1134392277

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Registry record

Entity type Individual (Type 1)
Name Dr. Mark Edward Swierczewski
Credential DDS
Sex Male
Practice address 60 W Walnut St, Lancaster, PA, 17603
Phone (717) 394-4466
Enumeration date Apr 9, 2008
Last updated in NPPES May 24, 2021

Taxonomy & licenses

1223G0001X General Practice Dentistry Dental Providers · License DS027660L (PA) Primary
DDS · Doctor of Dental Surgery: A licensed dentist; DDS and DMD are equivalent dental degrees. About the DDS credential

Other identifiers

Identifier Type State Issuer
DS027660L Other PA STATE LICENSE NUMBER

What is an NPI number?

A National Provider Identifier (NPI) is a unique 10-digit number that CMS assigns to every U.S. healthcare provider and organization under HIPAA. Type 1 NPIs identify individual providers; Type 2 NPIs identify organizations. The NPI appears on insurance claims, prescriptions, and credentialing paperwork, and never changes, even if the provider moves or changes specialty.

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Frequently asked questions

Is NPI 1134392277 active?
Yes, as of the latest NPPES snapshot, NPI 1134392277 is active (record last updated 2021-05-24).
How do I verify Mark Swierczewski's NPI record?
Cross-check NPI 1134392277 against the official CMS registry at npiregistry.cms.hhs.gov. This page mirrors the same public NPPES data with a monthly snapshot.

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Source: CMS NPPES (public data). Snapshot 2026-07-13. Provider record last updated 2021-05-24.