Type 2 · Organization ✓ Active NPI ✓ Valid NPI checksum

Robert A Zajac MD PA

Infectious Disease Physician in San Antonio, TX · enumerated 2006 · authorized official Robert Zajac, President.

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

National Provider Identifier

1255357653

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Registry record

Entity type Organization (Type 2)

Legal business name Robert A Zajac MD PA

Other name <Unavail>

Practice address 150 E Sonterra Blvd, Suite 170, San Antonio, TX, 78258

Phone (210) 481-2800

Fax (210) 481-2834

Enumeration date Jul 15, 2006

Last updated in NPPES Sep 15, 2015

Taxonomy & classification

207RI0200X Infectious Disease Physician Allopathic & Osteopathic Physicians · License H3973 (TX) Primary

Authorized official

Name Robert Zajac

Title President

Phone (210) 558-6288

Other identifiers

Identifier	Type	State	Issuer
183550601	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.

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Frequently asked questions

How current is this record?

Data comes from the CMS NPPES public dissemination file; this record was last updated in NPPES on 2015-09-15. Verify at npiregistry.cms.hhs.gov.

Where is Robert A Zajac MD PA located?

The practice location on file with NPPES is in San Antonio, TX.

Providers at this address

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Source: CMS NPPES (public data). Snapshot 2026-07-13. Provider record last updated 2015-09-15.