Type 1 · Individual ✓ Active NPI ✓ Valid NPI checksum

Dr. William Theodore Pastuszak, M.D.

Anatomic Pathology & Clinical Pathology Physician in Hartford, CT · enumerated 2005.

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

National Provider Identifier

1366430886

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Registry record

Entity type Individual (Type 1)

Name Dr. William Theodore Pastuszak

Credential M.D.

Sex Male

Practice address 80 Seymour St, Hartford, CT, 06102

Phone (860) 545-2249

Fax (860) 545-2204

Enumeration date Oct 10, 2005

Last updated in NPPES Jan 10, 2014

Taxonomy & licenses

207ZP0102X Anatomic Pathology & Clinical Pathology Physician Allopathic & Osteopathic Physicians · License 016441 (CT) Primary

MD · Doctor of Medicine: A physician who completed medical school (allopathic medicine), residency training, and state licensure. About the MD credential

Other identifiers

Identifier	Type	State	Issuer
001274787	Medicaid	CT	-

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

How do I verify William Pastuszak's NPI record?

Cross-check NPI 1366430886 against the official CMS registry at npiregistry.cms.hhs.gov. This page mirrors the same public NPPES data with a monthly snapshot.

Is NPI 1366430886 active?

Yes, as of the latest NPPES snapshot, NPI 1366430886 is active (record last updated 2014-01-10).

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Joao Delgado Emergency Medicine Physician · Hartford, CT NPI 1457359523 Robert Bligh Physician Assistant · Hartford, CT NPI 1780684837 Dean Uphoff Anatomic Pathology & Clinical Pathology Physician · Hartford, CT NPI 1588665707 Timothy Boyd Radiation Oncology Physician · Hartford, CT NPI 1003818725 Helaine Bertsch Radiation Oncology Physician · Hartford, CT NPI 1013909993 Andrew Salner Radiation Oncology Physician · Hartford, CT NPI 1942292834 Susan Kim Radiation Oncology Physician · Hartford, CT NPI 1982697363 Kenneth Leopold Radiation Oncology Physician · Hartford, CT NPI 1780678078

Source: CMS NPPES (public data). Snapshot 2026-07-13. Provider record last updated 2014-01-10.