Han Tonthat, MD
Internal Medicine Physician · Herndon, VA
Han Tonthat, MD is an internal medicine physician with a practice address in Herndon, Virginia, and NPI 1801897335, issued on Aug 9, 2005. Check the license (Virginia 0101056112, as entered in NPPES) on the Virginia Department of Health Professions; the Medicare figures below come from public CMS files.
- Name
- Han Tonthat
- Credential
- MD
- Primary taxonomy
- Internal Medicine Physician 207R00000X
- License number
- 0101056112 VA
Self-reported in NPPES; status is on the state search - Practice location
- 1035 Sterling RD Ste 104, Herndon, VA 20170
- Phone
- (703) 840-0610
- Enumerated
- Aug 9, 2005
- Record last updated
- Oct 4, 2021 (not updated in 5 years: call before relying on the address or phone)
- Fax
- (571) 323-3243
- Medicare enrollment
- Enrolled (PECOS I20070726000330); accepts Medicare assignment
- Telehealth
- Offers telehealth (CMS)
- Entity
- Type 1 · individual
8 nearest internal medicine physician records → All 3,599 in Virginia → Look up another NPI →
Verify Han Tonthat in five checks
- 1IdentityNPI record in CMS NPPESNPI lookupConfirmed in NPPES
- 2LicenseActive license and public ordersVirginia Department of Health Professions
Search for license 0101056112Check the board - 3Other statesLicenses and actions elsewhereDocInfo (FSMB)Not checked
- 4ExclusionsMedicare and Medicaid bansHHS-OIG exclusion listNot checked
- 5CertificationBoard certificationABMS AOA NCCPA AANPNot checked
54% fewer Medicare Part D claims than the average internal medicine physician in 2024
1,448 Medicare Part D claims for 87 beneficiaries, against an average of 3,176 among the 108,855 providers of this specialty who prescribed in Part D.
Most prescribed
- Losartan Potassium131 claims
- Atorvastatin Calcium125 claims
- Metformin Hcl97 claims
- Farxiga63 claims
- Kerendia59 claims
- Fluticasone Propionate58 claims
Source: CMS Medicare Part D Prescribers by Provider and Drug, 2024 (data.cms.gov). Part D covers prescriptions for Medicare patients only; drugs with fewer than 11 claims are not published.
Industry payments in 2024: $572.98
23 payments; by number, the most common kind was food and beverage; the largest payer was AstraZeneca Pharmaceuticals LP. The 50,334 providers of this specialty with any payment received $1,303.06 on average. Payments are reported by manufacturers, not by the provider, and are not a sign of wrongdoing.
Source: CMS Open Payments, program year 2024 (openpaymentsdata.cms.gov); average among providers of this specialty with at least one payment.
Han Tonthat among 3,599 internal medicine physician records in Virginia
Han Tonthat, MD is one of 3,599 internal medicine physician records with a practice address in Virginia. 77% of them appear in a Medicare file (Part D prescribing, MIPS, Open Payments or Medicare group billing); this one does. Its NPI, issued in 2005, is newer than 0% of them.
- NPI issued2005 · 0% of these records are older, 91% newer
- In a Medicare fileYes · 77% of these records are
- In the CMS Doctors and Clinicians fileYes · 62% of these records are
- Graduated1995 · median 2003 among the 2,234 with a school on file
- Record last updated2021 · 53% of these records were not updated in five years or more
Source: CMS NPPES, file of Aug 9, 2026, every record with primary taxonomy 207R00000X and a Virginia practice address; Medicare files: CMS Part D Prescribers 2024, MIPS 2023, Open Payments 2024, Doctors and Clinicians (data.cms.gov).
Internal Medicine Physician providers in Virginia
There are 3,599 internal medicine physician records in Virginia.
All 3,599 in Virginia → Every provider in Herndon → Internal Medicine Physician nationwide →
The 8 internal medicine physician records with the nearest ZIP codes
- Phetpailin Amaralikit, MDHerndon, VA 201701730356619
- Glen Tomkins, MDHerndon, VA 201701366722126
- Ravi Iyer, M.D.Herndon, VA 201711467425876
- Shalini Kaneriya, MDHerndon, VA 201711699833400
- Ira Marathe, M.D.Herndon, VA 201711861585374
- Wesam Moustafa Hussein, M.D.Herndon, VA 201711043539919
- Barbara Whayne, M.D.Oak Hill, VA 201711275868937
- Ali Awadallah, MDDulles, VA 201661962196261
Common questions
What is Han Tonthat, MD's NPI number?
Han Tonthat, MD's National Provider Identifier (NPI) is 1801897335, issued on Aug 9, 2005. An NPI identifies a provider in billing; it is not a license.
Where is Han Tonthat, MD located?
The NPPES record lists a practice address at 1035 Sterling RD Ste 104, Herndon, VA, 20170. Phone: (703) 840-0610. Providers update this record themselves, so call before visiting.
How can I verify Han Tonthat, MD's license?
NPPES lists Virginia license number 0101056112, as entered by the provider. Search the Virginia Department of Health Professions at https://dhp.virginiainteractive.org/lookup/index. The NPPES record confirms identity only; the state search shows license status, expiration and public orders.
How much does Han Tonthat, MD prescribe under Medicare Part D?
In 2024, Han Tonthat, MD had 1,448 Medicare Part D claims for 87 beneficiaries; the average among internal medicine physician prescribers was 3,176. Part D covers Medicare prescriptions only.
Source: CMS National Plan and Provider Enumeration System (NPPES), file of Aug 9, 2026 (NPPES files on CMS.gov); NUCC Health Care Provider Taxonomy. Medicare files from data.cms.gov. An NPI identifies who bills; it is not a license.
Figures on PlainDoctor are read from the federal files each page names (CMS NPPES, Medicare Part D, MIPS, Open Payments; the HHS-OIG exclusion list only as counts) and from Census population estimates, with the file date shown beside them. See our editorial standards & corrections policy, the methodology behind these numbers, or report a data error. Data current as of Aug 9, 2026.