Quick answers
- Where does Han Tonthat see patients?
- Medicare's clinician data lists 1 practice location in Herndon, VA. Call before your visit to confirm the address.
- What is Han Tonthat's specialty?
- Medicare lists Internal Medicine as the primary specialty, and also Psychiatry.
- Does Han Tonthat accept Medicare assignment?
- Yes. Medicare's clinician data says Han Tonthat accepts Medicare assignment (the Medicare-approved amount as full payment for covered services), as of 2026-10-02. Ask the office to confirm before your visit.
- Does Han Tonthat offer telehealth?
- Medicare's clinician data says Han Tonthat offers telehealth services. Ask the office which visits can be done by video or phone.
- What is the phone number for Han Tonthat?
- (786) 788-5080, as listed in official Medicare / NPI Registry data.
- What is Han Tonthat's NPI number?
- 1801897335. The NPI (National Provider Identifier) is the clinician's permanent federal ID; you can look it up in the official NPI Registry.
Practice locations
Addresses where Han Tonthat is enrolled with Medicare (CMS data updated 2026-10-02).
- 1035 Sterling Rd, Suite 104Herndon, VA 20170 (786) 788‑5080
Specialties
- Internal Medicineprimary
- Psychiatryalso
Other internal medicine doctors in Herndon
Clinicians with the same Medicare primary specialty in Herndon, VA — not a recommendation.
Clinician information
| Credential | MD |
|---|---|
| Graduation year | 1995 |
| Gender (as listed) | Male |
| Medicare assignment | Accepts (Medicare-approved amount as full payment) |
| Telehealth | Offers telehealth services |
| NPI (National Provider Identifier) | 1801897335 |
| Corrections | Report an error or suggest an update → |
Most corrections must be made at the source: clinicians update their NPI Registry record (NPPES) and their Medicare enrollment (PECOS); this page follows the next data release.
Sources
- National Downloadable File (Doctors and Clinicians) — CMS, data updated 2026-10-02, retrieved 2026-10-29
- NPI Registry — U.S. Department of Health and Human Services (NPPES), the clinician’s official record
- Medicare Care Compare — official Medicare tool to look up clinicians