Quick answers
- Where does Stefan Lowenstein see patients?
- Medicare's clinician data lists 2 practice locations, including San Francisco, CA and Mill Valley, CA. Call before your visit to confirm the address.
- What is Stefan Lowenstein's specialty?
- Medicare lists Dermatology as the primary specialty.
- Does Stefan Lowenstein accept Medicare assignment?
- Yes. Medicare's clinician data says Stefan Lowenstein 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.
- What is the phone number for Stefan Lowenstein?
- (415) 393-9550, as listed in official Medicare / NPI Registry data.
- What is Stefan Lowenstein's NPI number?
- 1245728807. 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 Stefan Lowenstein is enrolled with Medicare (CMS data updated 2026-10-02).
- 450 Sutter St, Rm 830San Francisco, CA 94108 (415) 393‑9550
- 535 Miller AveMill Valley, CA 94941 (415) 383‑5486
Group practices
Medicare enrollment lists Stefan Lowenstein as a member of these groups (CMS data updated 2026-10-02).
- Union Square Dermatology a Professional Corporation4 clinicians in the group
- Aesthetic Dermatology and Cosmetic Surgery Medical Associates Inc2 clinicians in the group
Specialties
- Dermatologyprimary
Other dermatologists in San Francisco
Clinicians with the same Medicare primary specialty in San Francisco, CA — not a recommendation.
Clinician information
| Credential | MD |
|---|---|
| Medical school | University Of California, San Francisco School Of Medicine |
| Graduation year | 2018 |
| Gender (as listed) | Male |
| Medicare assignment | Accepts (Medicare-approved amount as full payment) |
| NPI (National Provider Identifier) | 1245728807 |
| 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