Type 1 · Individual ✓ Active NPI ✓ Valid NPI checksum

Dr. Thaddeus G. Zawislak Jr., D.M.D.

General Practice Dentistry in Oil City, PA · enumerated 2005.

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

National Provider Identifier

1063499986

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Registry record

Entity type Individual (Type 1)

Name Dr. Thaddeus G. Zawislak Jr.

Credential D.M.D.

Sex Male

Practice address 161 E Bissell Ave, Oil City, PA, 16301

Phone (814) 677-1341

Fax (814) 676-6627

Enumeration date Dec 30, 2005

Last updated in NPPES Aug 11, 2014

Taxonomy & licenses

1223G0001X General Practice Dentistry Dental Providers · License DS026933L (PA) Primary

DMD · Doctor of Medicine in Dentistry: A licensed dentist; DMD and DDS are equivalent dental degrees. About the DMD credential

Other identifiers

Identifier	Type	State	Issuer
0011797170002	Medicaid	PA	-

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.

Read the full guide → Validate an NPI →

Frequently asked questions

What specialty is Thaddeus Zawislak?

Thaddeus Zawislak is registered in NPPES with the primary taxonomy of General Practice Dentistry. The taxonomy code describes the provider's classification and area of specialization for claims and credentialing.

Is this the official NPI registry?

No. NPI Portal is a private site built on public CMS NPPES data. The official registry is npiregistry.cms.hhs.gov, operated by CMS.

Source: CMS NPPES (public data). Snapshot 2026-07-13. Provider record last updated 2014-08-11.