Robert A. Zajac, MD
Infectious Disease Physician · San Antonio, TX
Robert A. Zajac, MD is an infectious disease physician with a practice address in San Antonio, Texas, and NPI 1013907963, issued on Oct 24, 2005. Check the license (Texas H3973, as entered in NPPES) on the Texas Medical Board; the Medicare figures below come from public CMS files.
- Name
- Robert A. Zajac
- Credential
- MD
- Primary taxonomy
- Infectious Disease Physician 207RI0200X
- License number
- H3973 TX
Self-reported in NPPES; status is on the state search - Practice location
- 150 E Sonterra Blvd, San Antonio, TX 78258
- Phone
- (210) 481-2800
- Enumerated
- Oct 24, 2005
- Record last updated
- Aug 8, 2024
- Fax
- (210) 481-2834
- Medicaid ID
- 131416308 TX
- Medicare enrollment
- Enrolled (PECOS I20060821000053); accepts Medicare assignment
- Medical or professional school
- Louisiana State University School Of Medicine In New Orleans, 1981
- Telehealth
- Offers telehealth (CMS)
- Entity
- Type 1 · individual
8 nearest infectious disease physician records → All 674 in Texas → Look up another NPI →
Also registered at 150 E Sonterra Blvd
A shared address usually means a shared clinic or building; it does not show who employs whom.
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Verify Robert A. Zajac in five checks
- 1IdentityNPI record in CMS NPPESNPI lookupConfirmed in NPPES
- 2LicenseActive license and public ordersTexas Medical Board
Search for license H3973Check the board - 3Other statesLicenses and actions elsewhereDocInfo (FSMB)Not checked
- 4ExclusionsMedicare and Medicaid bansHHS-OIG exclusion listNot checked
- 5CertificationBoard certificationABMS AOA NCCPA AANPNot checked
3.4 times the Medicare Part D claims of the average infectious disease physician in 2024
2,369 Medicare Part D claims for 462 beneficiaries, against an average of 689 among the 7,388 providers of this specialty who prescribed in Part D. Brand-name drugs were 19% of claims.
Most prescribed
- Doxycycline Hyclate437 claims
- Cefdinir162 claims
- Biktarvy147 claims
- Cefadroxil138 claims
- Daptomycin81 claims
- Levofloxacin80 claims
Source: CMS Medicare Part D Prescribers by Provider and Drug, 2024 (data.cms.gov). Part D covers prescriptions for Medicare patients only; drugs with fewer than 11 claims are not published.
The practice group's MIPS final score for 2023 (Medicare payment program): 83.9 of 100
The Merit-based Incentive Payment System score is reported for the practice group, not for one clinician alone. Four categories are weighted into the final score; the average among 454,083 clinicians with a measured score was 83.5.
Source: CMS Quality Payment Program, MIPS performance year 2023, group reporting; category weights for 2023 (qpp.cms.gov).
Industry payments in 2024: $487.23
24 payments; by number, the most common kind was food and beverage; the largest payer was Abbvie Inc. The 3,895 providers of this specialty with any payment received $4,362.19 on average. Payments are reported by manufacturers, not by the provider, and are not a sign of wrongdoing.
Source: CMS Open Payments, program year 2024 (openpaymentsdata.cms.gov); average among providers of this specialty with at least one payment.
Bills Medicare through one group practice
- Robert A Zajac MD PASan Antonio, TX
Source: CMS Doctors and Clinicians National Downloadable File (the group practices a clinician bills Medicare through) (data.cms.gov).
Robert A. Zajac among 674 infectious disease physician records in Texas
Robert A. Zajac, MD is one of 674 infectious disease physician records with a practice address in Texas. 84% of them appear in a Medicare file (Part D prescribing, MIPS, Open Payments or Medicare group billing); this one does. Its NPI, issued in 2005, is newer than 0% of them.
- NPI issued2005 · 0% of these records are older, 93% newer
- In a Medicare fileYes · 84% of these records are
- In the CMS Doctors and Clinicians fileYes · 76% of these records are
- Graduated1981 · median 2002 among the 510 with a school on file
- Record last updated2024 · 46% of these records were not updated in five years or more
Source: CMS NPPES, file of Aug 9, 2026, every record with primary taxonomy 207RI0200X and a Texas practice address; Medicare files: CMS Part D Prescribers 2024, MIPS 2023, Open Payments 2024, Doctors and Clinicians (data.cms.gov).
Infectious Disease Physician providers in Texas
There are 674 infectious disease physician records in Texas.
All 674 in Texas → Every provider in San Antonio → Infectious Disease Physician nationwide →
The 8 infectious disease physician records with the nearest ZIP codes
- Richard Fetchick, MDShavano Park, TX 782491134119183
- Michael Forgione, MDJbsa Lackland, TX 782361992853741
- Daniel Cybulski, MDSan Antonio, TX 782341487044152
- Mary Ford, M.D.Jbsa Ft Sam Houston, TX 782341730540048
- Oscar Gallardo-Huizar, MDJbsa Ft Sam Houston, TX 782341477181626
- Matthew Geringer, D.O.Jbsa Ft Sam Houston, TX 782341336689611
- Keith Glenn, MDFort Sam Houston, TX 782341487044608
- Luke Jackson, MDJbsa Ft Sam Houston, TX 782341588258701
Common questions
What is Robert A. Zajac, MD's NPI number?
Robert A. Zajac, MD's National Provider Identifier (NPI) is 1013907963, issued on Oct 24, 2005. An NPI identifies a provider in billing; it is not a license.
Where is Robert A. Zajac, MD located?
The NPPES record lists a practice address at 150 E Sonterra Blvd, San Antonio, TX, 78258. Phone: (210) 481-2800. Providers update this record themselves, so call before visiting.
How can I verify Robert A. Zajac, MD's license?
NPPES lists Texas license number H3973, as entered by the provider. Search the Texas Medical Board at https://profile.tmb.state.tx.us/Search.aspx. The NPPES record confirms identity only; the state search shows license status, expiration and public orders.
How much does Robert A. Zajac, MD prescribe under Medicare Part D?
In 2024, Robert A. Zajac, MD had 2,369 Medicare Part D claims for 462 beneficiaries; the average among infectious disease physician prescribers was 689. Part D covers Medicare prescriptions only.
What is Robert A. Zajac, MD's MIPS final score?
The 2023 MIPS final score is 83.9 of 100, reported for the practice group. The average among 454,083 clinicians with a measured score was 83.5.
Source: CMS National Plan and Provider Enumeration System (NPPES), file of Aug 9, 2026 (NPPES files on CMS.gov); NUCC Health Care Provider Taxonomy. Medicare files from data.cms.gov. An NPI identifies who bills; it is not a license.
Figures on PlainDoctor are read from the federal files each page names (CMS NPPES, Medicare Part D, MIPS, Open Payments; the HHS-OIG exclusion list only as counts) and from Census population estimates, with the file date shown beside them. See our editorial standards & corrections policy, the methodology behind these numbers, or report a data error. Data current as of Aug 9, 2026.