ROBERT A ZAJAC (MD) – Infectious Disease Physician, NPI 1013907963
Infectious Disease Physician
Main info
Doctor Profile
Profile Insights
NPPES metrics only — not quality of care.
674 INFECTIOUS DISEASE in TX
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Provider Addresses for ROBERT A ZAJAC (MD)
San Antonio Post Office, 2nd Street, San Antonio, Socorro County, New Mexico, United States
SAN ANTONIO, TX 782951346
Phone: (210) 558-6288
Fax: (210) 558-6289
Type: Mailing
150, East Sonterra Boulevard, San Antonio, Bexar County, Texas, 78258, United States
SUITE 170
SAN ANTONIO, TX 782584098
Phone: (210) 481-2800
Fax: (210) 481-2834
Type: Location
NPPES updates history
No NPPES updates recorded for this provider.
Prescription Activity
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Open Payments (CMS)
CMS reports 60 Open Payments records for all available years, with a total value of $1,104.
Total Amount is formed as General ($1,104) + Research ($0) + Ownership ($0) = $1,104.
Last reported payment date: 2024-12-09 • Largest payer in this snapshot: ViiV Healthcare Company ($327).
Total Amount
$1,104
General + Research + Ownership
Payments
60
Total payment records
General Amount
$1,104
General payments
Research Amount
$0
Research funding
Ownership Amount
$0
Ownership interests
Ownership Count
0
Ownership records
Last Payment Date
2024-12-09
Latest reported date
Top Companies
Largest payers in this snapshot
| Company | Amount |
|---|---|
| ViiV Healthcare Company | $327 |
| ABBVIE INC. | $291 |
| Ferring Pharmaceuticals Inc. | $99 |
| PFIZER INC. | $61 |
| AIMMUNE THERAPEUTICS, INC. | $53 |
Medicare Enrollment & Revalidation
Source: CMS public data · Not endorsed by CMS ·
Educational use only—not medical, billing, or legal advice.
PECOS enrollment status
Participating (accepts Medicare assignment)
Enrollment effective: 2006-08-21
PECOS data refreshed: 2026-05-27
Medicare revalidation (CMS due date list)
Due date not assigned yet
CMS is tracking this Medicare enrollment for revalidation, but has not published a due date.
Enrollment records
1
Earliest due date
Not assigned (TBD)
CMS data updated
2026-06-01
Revalidation progress
- Medicare enrolled
- On CMS revalidation list
- Due date assigned
- Revalidate in PECOS
CMS enrollment records
| Enrollment ID | Type | Specialty | State | Due date |
|---|---|---|---|---|
| I20060821000053 | I | Infectious Disease | TX | TBD |
What to do next
- No action required while the due date shows TBD.
- Check the CMS Revalidation Lookup Tool periodically — CMS updates the list about every 60 days.
- Do not submit a revalidation application in PECOS until CMS publishes a concrete due date.
Prepare CMS-855 application → · Look up this NPI in PECOS → · Verify on CMS PECOS
Medicare Utilization (FFS)
Source: CMS public data · Not endorsed by CMS · Beneficiary counts under 11 are suppressed in source data ·
Educational use only—not medical, billing, or legal advice.
Top Medicare procedures (2023) · refreshed 2026-05-27
| HCPCS | Description | Services | Beneficiaries | Medicare allowed |
|---|---|---|---|---|
| J1561 | Injection, immune globulin, (gamunex-c/gammaked), non-lyophilized (e.g., liquid), 500 mg | 38,530 | 38 | $0 |
| J1556 | Injection, immune globulin (bivigam), 500 mg | 15,960 | 30 | $0 |
| 96366 | Infusion into a vein for therapy, prevention, or diagnosis, each additional hour | 1,960 | 45 | $0 |
| 99233 | Subsequent hospital care with moderate levelof medical decision making, if using time, at least 50 minutes | 737 | 263 | $0 |
| 99232 | Subsequent hospital care with moderate levelof medical decision making, if using time, at least 35 minutes | 657 | 235 | $0 |
Insurance plans in this area (ZIP 78295)
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Group practice members
| Name | Specialty | State |
|---|---|---|
| Physician Assistant | TX | |
| Nurse Practitioner | TX | |
| - | TX | |
| Nurse Practitioner | TX | |
| Nurse Practitioner | TX | |
| Nurse Practitioner | TX |
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