Quick answers
- Where does Mark E. Hessenthaler see patients?
- Medicare's clinician data lists 2 practice locations, including San Jose, CA and Roseville, CA. Call before your visit to confirm the address.
- What is Mark E. Hessenthaler's specialty?
- Medicare lists Psychiatry as the primary specialty.
- Does Mark E. Hessenthaler accept Medicare assignment?
- Yes. Medicare's clinician data says Mark E. Hessenthaler 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 Mark E. Hessenthaler offer telehealth?
- Medicare's clinician data says Mark E. Hessenthaler offers telehealth services. Ask the office which visits can be done by video or phone.
- What is the phone number for Mark E. Hessenthaler?
- (800) 913-2615, as listed in official Medicare / NPI Registry data.
- What is Mark E. Hessenthaler's NPI number?
- 1487776506. 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 Mark E. Hessenthaler is enrolled with Medicare (CMS data updated 2026-10-02).
- 4850 Union AveSan Jose, CA 95124 (800) 913‑2615
- 508 Gibson Dr, Suite 140Roseville, CA 95678 (916) 694‑0555
Group practices
Medicare enrollment lists Mark E. Hessenthaler as a member of this group (CMS data updated 2026-10-02).
- LGTC Group24 clinicians in the group
Specialties
- Psychiatryprimary
Other psychiatrists in San Jose
Clinicians with the same Medicare primary specialty in San Jose, CA — not a recommendation.
Clinician information
| Graduation year | 2001 |
|---|---|
| Gender (as listed) | Male |
| Medicare assignment | Accepts (Medicare-approved amount as full payment) |
| Telehealth | Offers telehealth services |
| NPI (National Provider Identifier) | 1487776506 |
| 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