DR. ALEX TAN VILLACASTIN (M.D.) – Internal Medicine Physician, NPI 1194827097
Internal Medicine Physician
Main info
Doctor Profile
Profile Insights
NPPES metrics only — not quality of care.
12,378 INTERNAL MEDICINE in FL
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Provider Addresses for DR. ALEX TAN VILLACASTIN (M.D.)
Florida Avenue, Citrus Springs, Citrus County, Florida, 34434, United States
CITRUS SPRINGS, FL 344343268
Phone: (352) 489-2486
Fax: (352) 489-5786
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 291 Open Payments records for all available years, with a total value of $6,003.
Total Amount is formed as General ($6,003) + Research ($0) + Ownership ($0) = $6,003.
Last reported payment date: 2024-12-18 • Largest payer in this snapshot: AstraZeneca Pharmaceuticals LP ($1,214).
Total Amount
$6,003
General + Research + Ownership
Payments
291
Total payment records
General Amount
$6,003
General payments
Research Amount
$0
Research funding
Ownership Amount
$0
Ownership interests
Ownership Count
0
Ownership records
Last Payment Date
2024-12-18
Latest reported date
Top Companies
Largest payers in this snapshot
| Company | Amount |
|---|---|
| AstraZeneca Pharmaceuticals LP | $1,214 |
| PFIZER INC. | $885 |
| GlaxoSmithKline, LLC. | $559 |
| ABBVIE INC. | $515 |
| Novo Nordisk Inc | $291 |
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: 2010-04-22
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 |
|---|---|---|---|---|
| I20100422000217 | I | Internal Medicine | FL | 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 |
|---|---|---|---|---|
| 99309 | Subsequent nursing facility care with moderate level of medical decision making, per day, if using time, at least 30 minutes | 1,233 | 299 | $0 |
| 36415 | Insertion of needle into vein for collection of blood sample | 665 | 422 | $0 |
| 99308 | Subsequent nursing facility care with straightforward level of medical decision making, per day, if using time, at least 15 minutes | 510 | 170 | $0 |
| 87428 | Detection test by immunoassay technique for severe acute respiratory syndrome coronavirus and influenza | 371 | 276 | $0 |
| 81002 | Urinalysis, manual test | 303 | 228 | $0 |
Insurance plans in this area (ZIP 34434)
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Provider's Procedures
| Specialty | Practice State | HCPCS Code | Description | Service Count | Beneficiary Count |
|---|---|---|---|---|---|
| INTERNAL MEDICINE | FL | 85610 | Blood test, clotting time | 428 | 64 |
Group practice members
| Name | Specialty | State |
|---|---|---|
| Internal Medicine | FL | |
| Family Practice | FL | |
| Family Practice | FL | |
| Family Practice | FL | |
| Internal Medicine, Cardiovascular Disease (Cardiology) | FL | |
| Internal Medicine | FL | |
| Family Practice | FL | |
| Family Practice | GA | |
| Family Practice | FL | |
| Internal Medicine | IL |
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