Stefan Lowenstein, MD
NPI 1245728807 · Dermatology Physician · Mill Valley, CA
Enrolled with Medicare as Practitioner - Dermatology · source: CMS PECOS Public Provider Enrollment (2026.04.01)
Stefan Lowenstein, MD is a Dermatology Physician provider in Mill Valley, CA (NPI 1245728807).
Provider details
- NPI number
- 1245728807
- Entity type
- Individual
- Primary specialty
- Dermatology PhysicianAllopathic & Osteopathic Physicians
- Credential
- MD
- Sex
- Male
- Sole proprietor
- Yes
- License
- A165056 (CA)
Specialties & taxonomies
Allopathic & Osteopathic Physicians
Student, Health Care
Allopathic & Osteopathic Physicians
Allopathic & Osteopathic Physicians
Profile Score
A profile completeness & documented-activity index — NOT a quality, outcomes, or patient-satisfaction rating.
- Registry tenure25% of score
8 yrs in NPPES registry
- Profile completeness25% of score
100% of core fields populated
- Practice footprint15% of score
1 documented practice location
- Medicare service volume (vs. specialty peers)25% of score
2,958 Medicare services, 2024 (ranked within specialty)
- Open Payments transparency10% of score
Has Open Payments disclosures (2024)
Medicare volume is ranked against active providers in the same specialty. Signals a provider has no public data for (e.g. Medicare claims) are left out of the score entirely — never counted as zero — so providers without that data are not penalized. See the full formula and weights in our .
What this provider does (Medicare)
Based on Medicare fee-for-service claims, 2024; not all care is captured.
| Service (HCPCS) | Medicare services | Typical Medicare-allowed (2024) |
|---|---|---|
| Destruction of Precancer Skin Growth, 2-14 Growths17003 | 1,029 | $9 |
| Established Patient Office Or Other Outpatient Visit With Low Level OD Decision Making, If Using Time, 20 Minutes Or More99213 | 503 | $109 |
| Destruction of Precancer Skin Growth, 1 Growth17000 | 434 | $70 |
| Biopsy of Related Skin Growth, First Growth11102 | 269 | $126 |
| Established Patient Office Or Other Outpatient Visit With Moderate Level of Decision Making, If Using Time, 30 Minutes Or More99214 | 140 | $151 |
| Established Patient Office Or Other Outpatient Visit With Straightforward Medical Decision Making, If Using Time, 10 Minutes Or More |
What this provider prescribes (Medicare Part D)
Top drugs by Medicare Part D claim volume, 2024 · 14 distinct drugs on file.
| Drug | Part D claims (2024) | Beneficiaries |
|---|---|---|
| Ketoconazole | 74 | 42 |
| Triamcinolone Acetonide | 70 | 52 |
| Doxycycline Hyclate | 56 | 42 |
| Hydrocortisone | 55 | 46 |
| Minoxidil | 35 | — |
| Fluorouracil | 30 | 24 |
| Clobetasol Propionate | 28 | 24 |
| Tretinoin | 21 | 12 |
Transparency — industry payments
Based on CMS Open Payments, 2024; not all care is captured.
$2,027 across 87 records (Open Payments 2024)
Open Payments discloses payments and transfers of value (meals, travel, consulting, research, royalties) from drug and device makers to providers. This is a transparency signal, not a verdict — such payments are legal and common, and their presence is neither an endorsement nor a criticism. Source: CMS Open Payments, program year 2024.
Practice location
Mailing address
Registry dates
- Enumerated
- 2018-04-28
- Last updated
- 2026-04-23
- Certified
- 2026-04-23
Frequently asked questions
- What is Stefan Lowenstein's NPI number?
- Stefan Lowenstein's National Provider Identifier (NPI) is 1245728807, a unique 10-digit ID issued by CMS for use in standard healthcare transactions.
- What is Stefan Lowenstein's specialty?
- Stefan Lowenstein is listed in the NPPES registry with a primary specialty of Dermatology Physician (Allopathic & Osteopathic Physicians).
- Where is Stefan Lowenstein located?
- Stefan Lowenstein's practice location on file with NPPES is 535 Miller Ave, Mill Valley, CA 94941-2905.
- What is Stefan Lowenstein's phone number?
- The practice phone number listed in the NPPES registry for Stefan Lowenstein is (415) 383-5475.
- Does Stefan Lowenstein accept Medicare?
- Stefan Lowenstein is approved to bill Medicare according to CMS PECOS enrollment data (2026.04.01). Confirm current participation with the provider before scheduling.
- Is Stefan Lowenstein's NPI active?
- Yes — Stefan Lowenstein's NPI (1245728807) is active in the NPPES registry as of the last update on 2026-04-23.
Source: CMS NPPES Data Dissemination (June 2026). NPI Central is not affiliated with CMS. Data is provided as-is from the public registry.