SANTIAGO VILLARREAL (M.D.) – Nephrology Physician, NPI 1225035199
Nephrology Physician
Main info
Doctor Profile
Profile Insights
NPPES metrics only — not quality of care.
1,168 NEPHROLOGY in TX
Provider Addresses for SANTIAGO VILLARREAL (M.D.)
4151 CALLAGHAN RD
SUITE 103
SAN ANTONIO, TX 782283419
Phone: (210) 647-1195
Fax: (210) 521-9473
Mailing address matches the actual address.
NPPES updates history
No NPPES updates recorded for this provider.
Prescription Activity
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Open Payments (CMS)
CMS reports 6 Open Payments records for all available years, with a total value of $399.
Total Amount is formed as General ($399) + Research ($0) + Ownership ($0) = $399.
Last reported payment date: 2024-07-30 • Largest payer in this snapshot: AstraZeneca Pharmaceuticals LP ($231).
Total Amount
$399
General + Research + Ownership
Payments
6
Total payment records
General Amount
$399
General payments
Research Amount
$0
Research funding
Ownership Amount
$0
Ownership interests
Ownership Count
0
Ownership records
Last Payment Date
2024-07-30
Latest reported date
Top Companies
Largest payers in this snapshot
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: 2008-04-17
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 |
|---|---|---|---|---|
| I20080417000298 | I | Nephrology | 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 |
|---|---|---|---|---|
| 90935 | Hemodialysis procedure with physician evaluation | 177 | 25 | $0 |
| 90960 | Dialysis services, 4 or more physician visits per month (20 years or older) | 160 | 28 | $0 |
| 99231 | Subsequent hospital care with straightforward or low level of medical decision making, per day, if using time, at least 25 minutes | 138 | 31 | $0 |
| 90961 | Dialysis services, 2-3 physician visits per month (20 years or older) | 125 | 33 | $0 |
| 99232 | Subsequent hospital care with moderate levelof medical decision making, if using time, at least 35 minutes | 66 | 26 | $0 |
Insurance plans in this area (ZIP 78228)
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