Dr. Robert Zajac, MD
What this data tells you about Dr. Zajac
Dr. Robert Zajac is an infectious disease in San Antonio, TX, with 20 years in practice. Based on federal Medicare data, Dr. Zajac performed 60,431 Medicare services across 1,278 unique beneficiaries.
Between the years covered by Open Payments, Dr. Zajac received a total of $12,550 from 41 pharmaceutical and/or device companies across 571 individual payments. These payments are legal, publicly disclosed under the federal Sunshine Act, and common in infectious disease. Most payments are for meals and travel — low-value interactions common across virtually all practicing physicians. Patients may wish to discuss these relationships with their provider.
The Data Coverage level for Dr. Zajac is Very High — reflecting how much public federal data is available about this provider. This is not a quality rating. Patients are encouraged to use this data as one of several factors when choosing a healthcare provider.
Medicare Practice Summary
Medicare Utilization ↗Top procedures by volume
Ranked by number of services performed for Medicare patients. Avg. submitted charge is what the provider billed; avg. Medicare payment is what CMS paid.
| Procedure | Volume | Avg. paid | Avg. submitted |
|---|---|---|---|
| Injection, immune globulin, (gamunex-c/gammaked), non-lyophilized (e.g., liquid), 500 mg | 38,530 | $39 | $297 |
| Injection, immune globulin (bivigam), 500 mg | 15,960 | $56 | $244 |
| Infusion into a vein for therapy, prevention, or diagnosis, each additional hour | 1,960 | $16 | $67 |
| Hospital follow-up visit, high complexity | 737 | $91 | $204 |
| Hospital follow-up visit, moderate complexity | 657 | $61 | $142 |
| Infusion into a vein for therapy, prevention, or diagnosis, 1 hour or less | 639 | $49 | $215 |
| Injection, immune globulin, intravenous, non-lyophilized (e.g., liquid), not otherwise specified, 500 mg | 593 | $885 | $5,599 |
| Injection of additional new drug or substance into vein | 362 | $12 | $51 |
| Injection, ketorolac tromethamine, per 15 mg | 334 | $0 | $1 |
| Initial hospital admission, high complexity | 271 | $132 | $397 |
| Office visit, established patient, complex (40-54 min) | 130 | $122 | $280 |
| Initial hospital admission, moderate complexity | 66 | $100 | $268 |
| Hospital follow-up visit, low complexity | 43 | $39 | $76 |
| Office visit, established patient (30-39 min) | 41 | $93 | $214 |
| Physician or allowed practitioner certification for medicare-covered home health services under a home health plan of care (patient not present), including contacts with home health agency and review of reports of patient status required by physicians and | 40 | $40 | $103 |
| Prolonged office or other outpatient evaluation and management service(s) beyond the maximum required time of the primary procedure which has been selected using total time on the date of the primary service; each additional 15 minutes by the physician or | 29 | $24 | $150 |
| Physician or allowed practitioner supervision of a patient receiving medicare-covered services provided by a participating home health agency (patient not present) requiring complex and multidisciplinary care modalities involving regular physician or allow | 22 | $79 | $209 |
| New patient office visit (45-59 min) | 17 | $103 | $318 |
Industry Payment Transparency
Open Payments through 2024 ↗Payment profile
Industry payments classified by relationship type. Not all payments are equal — research and consulting reflect different relationships than speaking programs or meals.
Payment trend by year
Annual totals from pharmaceutical and medical device companies.
Payments by company (2024)
Associated products mentioned in payments ›
Most payments (100%) are for meals and travel — low-value interactions that are common across virtually all practicing physicians.
Geographic Context
0.0 mi
Data Sources
| Provider Registry | ✓ NPPES | Weekly updates |
| Medicare Enrollment | ✓ PECOS | Monthly updates |
| Practice Data | ✓ Medicare Util. | Annual (CY lag) |
| Industry Payments | ✓ Open Payments | CY 2024 |
| Disciplinary History | — Not public | N/A |
This provider has data in 4 of 4 available federal datasets, with a Data Coverage level of Very High. This measures how much public data is available about a provider — not how good they are. How we calculate this →
Summary
Dr. Zajac is a mixed practice specialist, with above-average Medicare volume (top 2% in TX), and high industry engagement (low-engagement, top 12%), with 20 years of practice experience.
This summary is auto-generated from federal data. It describes data availability and patterns — not clinical quality. Read our methodology →
Frequently Asked Questions
Is Dr. Zajac experienced with injection, immune globulin, (gamunex-c/gammaked), non-lyophilized (e.g., liquid), 500 mg?
Does Dr. Zajac receive payments from pharmaceutical companies?
How do Dr. Zajac's costs compare to other infectious diseases in San Antonio?
What does Data Coverage mean?
Is this data up to date?
Explore related providers
All data on this page is sourced verbatim from public federal records published by the U.S. Centers for Medicare & Medicaid Services (CMS): NPPES ↗, Open Payments ↗, Medicare Provider Utilization ↗, and PECOS. Publication is mandated by the Physician Payments Sunshine Act (§6002 ACA, 42 U.S.C. §1320a-7h) and the Freedom of Information Act.
This page is not medical advice, an endorsement, a recommendation, or a quality rating. The Transparency Score measures data completeness — how much federal information exists for this provider — not clinical performance, patient outcomes, or quality of care. Always verify information directly with the provider and consult a licensed clinician before making medical decisions.
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