DR. HAN TONTHAT (MD) – Internal Medicine Physician, NPI 1801897335
Internal Medicine Physician
Main info
Doctor Profile
Profile Insights
NPPES metrics only — not quality of care.
4,934 INTERNAL MEDICINE in VA
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Provider Addresses for DR. HAN TONTHAT (MD)
1041, Sterling Road, Herndon, Virginia, 20170, United States
STE 106
HERNDON, VA 201703841
Phone: (703) 840-0610
Fax: (571) 323-3243
Type: Mailing
1035 STERLING RD STE 104
HERNDON, VA 201703838
Phone: (703) 840-0610
Fax: (571) 323-3243
Type: Mailing
NPPES updates history
No NPPES updates recorded for this provider.
Prescription Activity
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Open Payments (CMS)
CMS reports 52 Open Payments records for all available years, with a total value of $1,274.
Total Amount is formed as General ($1,274) + Research ($0) + Ownership ($0) = $1,274.
Last reported payment date: 2024-12-13 • Largest payer in this snapshot: AstraZeneca Pharmaceuticals LP ($473).
Total Amount
$1,274
General + Research + Ownership
Payments
52
Total payment records
General Amount
$1,274
General payments
Research Amount
$0
Research funding
Ownership Amount
$0
Ownership interests
Ownership Count
0
Ownership records
Last Payment Date
2024-12-13
Latest reported date
Top Companies
Largest payers in this snapshot
| Company | Amount |
|---|---|
| AstraZeneca Pharmaceuticals LP | $473 |
| Novo Nordisk Inc | $254 |
| Amgen Inc. | $202 |
| Bayer Healthcare Pharmaceuticals Inc. | $138 |
| Lilly USA, LLC | $69 |
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: 2007-07-26
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 |
|---|---|---|---|---|
| I20070726000330 | I | Internal Medicine | DC | 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 |
|---|---|---|---|---|
| 99213 | Established patient office or other outpatient visit, 20-29 minutes | 24 | 16 | $0 |
| 99214 | Established patient office or other outpatient visit, 30-39 minutes | 15 | 11 | $0 |
Insurance plans in this area (ZIP 20170)
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