Type 1 · Individual ✓ Active NPI ✓ Valid NPI checksum

Dr. William Matthew Bartek, M.D

Critical Care Medicine (Internal Medicine) Physician in Austin, TX · enumerated 2006.

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

National Provider Identifier

1598722522

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Registry record

Entity type Individual (Type 1)

Name Dr. William Matthew Bartek

Credential M.D

Sex Male

Practice address 5920 W William Cannon Dr, Bldg 1 Ste 150, Austin, TX, 78749

Phone (512) 441-9799

Fax (512) 441-9814

Enumeration date Apr 26, 2006

Last updated in NPPES Oct 24, 2016

Taxonomy & licenses

207RP1001X Pulmonary Disease Physician Allopathic & Osteopathic Physicians · License K2642 (TX) Secondary

207RC0200X Critical Care Medicine (Internal Medicine) Physician Allopathic & Osteopathic Physicians · License K2642 (TX) 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
153723501	Medicaid	TX	-

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 is the NPI number for William Bartek?

The National Provider Identifier (NPI) for William Bartek is 1598722522, a Type 1 (individual) record in the CMS NPPES registry.

Where does William Bartek practice?

The practice location on file with NPPES is in Austin, TX. Providers can have multiple locations; NPPES lists the primary practice address.

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Source: CMS NPPES (public data). Snapshot 2026-07-13. Provider record last updated 2016-10-24.