Doctor profile · Federal record
Dr. Han Tonthat, MD
Internal Medicine Physician (CMS: Internal Medicine) · Herndon, VA
- NPI 1801897335
- Accepts Medicare
- 31 yrs in practice
- Male
- Group practice
- No sanctions
Practice & contact
- Primary practice
-
1035 Sterling RD Ste 104
Herndon, VA 201703838
(703) 840-0610
fax (571) 323-3243
Credentials & registration
- NPI registered
- August 2005 — 21 yrs on file
- Profile last updated
- October 4, 2021
- Year of graduation
- 1995 — 31 yrs since
- Specialty taxonomy
- 207R00000X — NUCC code
- State license (1)
- Virginia #0101056112
Federal sanctions & exclusions
No sanctions, exclusions or revocations on file
Checked against OIG LEIE on NPI 1801897335. Last verified May 11, 2026.Medicare procedures · 2023
Top services delivered
Total services
39
Distinct HCPCS
2
Medicare allowed
$3,776
| HCPCS | Description | Services | Patients | Avg allowed | |
|---|---|---|---|---|---|
99213 |
Established patient office or other outpatient visit, 20-29 minutes | 24 | 16 | $83 | |
99214 |
Established patient office or other outpatient visit, 30-39 minutes | 15 | 11 | $120 |
In context: peer comparison
Among 5 peers in Herndon Internal Medicine Physician, average services per provider: 140. This provider delivers 0.3× the peer median.Open Payments
Industry payments received
All-time total
$573
Transactions
23
Manufacturers
7
| Payer (manufacturer) | Industry | Txns | Amount |
|---|---|---|---|
| AstraZeneca Pharmaceuticals Lp | 8 | $235.24 | |
| Amgen INC. | 7 | $151.18 | |
| Lilly USA, LLC | 3 | $68.85 | |
| Bayer Healthcare Pharmaceuticals INC. | 2 | $42.49 | |
| Revance Therapeutics, INC. | 1 | $32.95 | |
| Pfizer INC. | 1 | $22.55 | |
| Novo Nordisk INC | 1 | $19.72 |
By nature of payment
Medicare Part D · 2023
Top prescriptions
Total claims
875
Patients
251
Total drug cost
$232,226
| Drug | Type | Claims | Patients | Total cost |
|---|---|---|---|---|
| Losartan Potassium | Generic | 138 | 40 | $1,532 |
| Atorvastatin Calcium | Generic | 131 | 43 | $1,247 |
| Metformin Hcl | Generic | 103 | 32 | $705 |
| Farxiga (Dapagliflozin Propanediol) | Brand | 75 | 22 | $110,582 |
| Amlodipine Besylate | Generic | 54 | 18 | $414 |
| Lisinopril | Generic | 48 | 16 | $363 |
| Fluticasone Propionate | Generic | 46 | 25 | $660 |
| Lovastatin | Generic | 44 | 14 | $669 |
| Kerendia (Finerenone) | Brand | 42 | 15 | $52,051 |
| Carvedilol | Generic | 39 | 12 | $605 |
Frequently asked questions
What is Dr. Han Tonthat's medical specialty?
Dr. Han Tonthat practices Internal Medicine Physician in Herndon, VA.
Where does Dr. Han Tonthat practice?
Dr. Han Tonthat practices at 1035 Sterling RD Ste 104, Herndon, VA 201703838. Office phone: 7038400610.
What is Dr. Han Tonthat's NPI?
Dr. Han Tonthat's National Provider Identifier (NPI) is 1801897335, issued by NPPES.
Does Dr. Han Tonthat accept Medicare assignment?
Yes. Dr. Han Tonthat accepts Medicare assignment, meaning Medicare-allowed amounts are accepted as full payment for covered services.
What procedures does Dr. Han Tonthat commonly perform?
Top Medicare-reported procedures in 2023: Established patient office or other outpatient visit (HCPCS 99213); Established patient office or other outpatient visit (HCPCS 99214). Source: CMS Medicare Physician & Other Practitioners file.