Independent US Healthcare Provider Directory & Public Medical Database
Active NPI 1245728807 Individual Practitioner Male Practitioner

Dr. Stefan Eric Lowenstein , MD

Dermatology • Mill Valley, CA

✓ Accepts Medicare Assignment

Professional Overview & Biography Verified Profile Summary

Dr. Stefan Lowenstein, MD is a certified Dermatology practicing in Mill Valley, CA. With approximately 8 years of clinical experience since graduating from University Of California, San Francisco School Of Medicine in 2018, Dr. Lowenstein delivers high-quality medical care to the local community at 535 MILLER AVE.

Dr. Lowenstein maintains professional affiliations with Golden State Dermatology Associates, Inc., Union Square Dermatology A Professional Corporation, Aesthetic Dermatology And Cosmetic Surgery Medical Associates Inc and accepts Medicare assignment.

Frequently performed procedures and clinical services include destruction of precancer skin growth, 2-14 growths, established patient outpatient office visit, destruction of skin growth. Full Medicare procedure pricing transparency rates and service volume details are listed on this profile.

Practice Location & Contact Primary Location

Practice Address

535 Miller Ave

Mill Valley, CA 949412905

Telephone 4153835475
Fax 4153831275
Associated Practice Facility / Clinic

Medicare Profile & Education

Medical School

University Of California, San Francisco School Of Medicine

Graduation Year

2018

Medicare Assignment

✓ Accepts Assignment

Telehealth Flag

In-Person Only

Specialty Benchmarks & Practice Insights

Comparative analytics for Dermatology in Mill Valley, CA

Experienced Practitioner (5-10 Yrs)
Practitioner Clinical Experience
8 Yrs -15.0 yrs vs City Avg
City Avg: 23.0 Yrs
State Avg: 24.9 Yrs
Regional Practice Density
6 Specialists

Practicing in Mill Valley, CA (2182 Statewide)

Telehealth Adoption Rate
0.0% Regional Adoption

In-Person Office Visits Only

Medicare Pricing Discount
50.1% Avg Savings

Under CMS Medicare Fee Schedule vs Standard Submitted Charges

Clinical Seniority & Experience Comparison

Dr. Lowenstein (8 Years) 8 Yrs
Mill Valley Specialty Average (23.0 Years) 23.0 Yrs

Performed Procedures & Service Volume

Top Medicare Part B procedures performed by this practitioner

CMS Official Data (2024)
Reporting Year:
HCPCS Code & Description Services Patients Submitted Charge Medicare Allowed
17003 Destruction of precancer skin growth, 2-14 growths
1,029 237 $15.54 $8.82
99213 Established patient office or other outpatient visit, typically 15 minutes
503 375 $180.67 $108.85
17000 Destruction of skin growth
434 310 $139.58 $70.33
11102 Tangential biopsy of single skin lesion
269 230 $224.29 $126.03
99214 Established patient office or other outpatient visit with moderate level of decision making, if using time, 30 minutes or more
140 114 $257.60 $151.37
99212 Established patient office or other outpatient visit with straightforward medical decision making, if using time, 10 minutes or more
127 114 $114.22 $69.27
17110 Destruction of up to 14 skin growths
79 69 $261.99 $146.52
99203 New patient office or other outpatient visit with low level of medical decision making, if using time, 30 minutes or more
69 69 $235.20 $133.49
11103 Biopsy of related skin growth, each additional growth
58 46 $109.14 $64.55
17311 Removal and microscopic exam of growth of head, neck, hands, feet, or genitals, 1-5 tissue blocks
46 40 $1355.80 $711.32
J3301 Injection, triamcinolone acetonide, not otherwise specified, 10 mg
35 18 $6.20 $0.98
13121 Repair of wound (2.6 to 7.5 centimeters) of scalp, arms, and/or legs
31 30 $903.51 $507.96
13132 Complicated repair of wound of forehead, cheeks, chin, mouth, neck, underarms, genitals, hands, or feet, 2.6-7.5 cm
28 27 $1026.76 $345.51
99202 New patient office or other outpatient visit, typically 20 minutes
26 26 $156.43 $87.33
17312 Removal and microscopic exam of growth of head, neck, hands, feet, or genitals, each additional stage, 1-5 tissue blocks
25 18 $819.64 $528.74
11603 Removal of cancer skin growth of body, arms, or legs, 2.1-3.0 cm
24 23 $593.47 $174.12
11900 Injection into skin growth, 1-7 growths
21 18 $120.28 $65.83
99204 New patient office or other outpatient visit with moderate level of medical decision making, if using time, 45 minutes or more
20 20 $345.19 $190.80
11104 Punch biopsy, first skin growth
17 16 $269.52 $162.39
11602 Removal of cancer skin growth of body, arms, or legs, 1.1-2.0 cm
12 12 $521.38 $167.34

Medical Specialties & State Licenses

CMS Verified: 2026-04-23
Dermatology Primary Specialty

NUCC Taxonomy Code: 207N00000X

State License CA A165056

A dermatologist is trained to diagnose and treat pediatric and adult patients with benign and malignant disorders of the skin, mouth, external genitalia, hair and nails, as well as a number of sexually transmitted diseases. The dermatologist has had additional training and experience in the diagnosis and treatment of skin cancers, melanomas, moles and other tumors of the skin, the management of contact dermatitis and other allergic and nonallergic skin disorders, and in the recognition of the skin manifestations of systemic (including internal malignancy) and infectious diseases. Dermatologists have special training in dermatopathology and in the surgical techniques used in dermatology. They also have expertise in the management of cosmetic disorders of the skin such as hair loss and scars and the skin changes associated with aging.

Student in an Organized Health Care Education/Training Program

NUCC Taxonomy Code: 390200000X

An individual who is enrolled in an organized health care education/training program leading to a degree, certification, registration, and/or licensure to provide health care.

Pathology - Dermatopathology

NUCC Taxonomy Code: 207ZD0900X

State License CA A165056

A dermatopathologist is an expert in diagnosing and monitoring diseases of the skin including infectious, immunologic, degenerative, and neoplastic diseases. This entails the examination and interpretation of specially prepared tissue sections, cellular scrapings, and smears of skin lesions by means of light microscopy, electron microscopy, and fluorescence microscopy.

Dermatology - MOHS-Micrographic Surgery

NUCC Taxonomy Code: 207ND0101X

State License CA A165056

The highly-trained surgeons that perform Mohs Micrographic Surgery are specialists both in dermatology and pathology. With their extensive knowledge of the skin and unique pathological skills, they are able to remove only diseased tissue, preserving healthy tissue and minimizing the cosmetic impact of the surgery. Mohs surgeons who belong to the American College of Mohs Surgery (ACMS) have completed a minimum of one year of fellowship training at one of the ACMS-approved training centers in the U.S.

Hospital & Practice Group Affiliations

Golden State Dermatology Associates, Inc.

1104 Adams St, Saint Helena, CA 945741175

Phone: 7079670800

Union Square Dermatology A Professional Corporation

450 Sutter St, San Francisco, CA 941083915

Phone: 4153939550

Aesthetic Dermatology And Cosmetic Surgery Medical Associates Inc

535 Miller Ave, Mill Valley, CA 949412905

Phone: 4153835486

Practice Associates & Co-Workers

Healthcare professionals and specialists practicing at this location or sharing practice phone/fax

2 Associated Practitioners
Dr. Jeffrey Binstock , MD

Dermatology - MOHS-Micrographic Surgery

NPI 1780677526

Doctor of Medicine (M.D.)

Mira Noble , NP

Nurse Practitioner

NPI 1801743992

Nurse Practitioner

Career & Practice History Timeline

Chronological log of verified NPI updates, location relocations, credentials, and registry changes

11 Historical Events
📍
Updated Practice Location April 23, 2026

Registered at 535 MILLER AVE, MILL VALLEY, CA 949412905 (Tel: 4153835475)

📍
Updated Business Mailing Address April 23, 2026

Registered at 535 MILLER AVE, MILL VALLEY, CA 949412905 (Tel: 4153835475)

🎓
Medical Taxonomy / Specialty Registered (Primary Specialty) April 23, 2026

Dermatology (License #A165056 in CA)

📍
Updated Practice Location August 05, 2018

Registered at 2425 GEARY BLVD, SAN FRANCISCO, CA 94115 (Tel: 4158332000)

📍
Updated Business Mailing Address August 05, 2018

Registered at 2425 GEARY BLVD, SAN FRANCISCO, CA 941153358 (Tel: 4158332000)

NPI Profile Active April 28, 2018

NPI status registered as active in NPPES database

📍
Updated Practice Location April 28, 2018

Registered at 2425 GEARY BLVD, SAN FRANCISCO, CA 941153358 (Tel: 4158332000)

📍
Updated Business Mailing Address April 28, 2018

Registered at 651 FOREST WAY, MILL VALLEY, CA 949413974 (Tel: 4153891543)

👤
Provider Name / Credentials Updated April 28, 2018

Recorded as STEFAN LOWENSTEIN, MD

🎓
Medical Taxonomy / Specialty Registered (Primary Specialty) April 28, 2018

Student in an Organized Health Care Education/Training Program

🟢
Initial NPI Registration & Enumeration April 28, 2018

First registered as active Individual Practitioner in NPPES Database.

Patient & Community Reviews

Verified patient ratings, medical care experiences, and facility photos

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NPI Administrative Meta

NPI Number: 1245728807
Entity Type:
Individual Provider Physician, Nurse Practitioner, or Solo Healthcare Professional (Type 1 NPI)
Enumeration Date: April 28, 2018
Last Update: April 23, 2026
Sole Proprietor: Yes

Mailing Address

535 Miller Ave

Mill Valley, CA 949412905

Phone: 4153835475

Public Domain Record This profile contains public domain information published by CMS and NPPES under the Freedom of Information Act (FOIA).
⚠️ Medical Disclaimer

This directory listing is for informational purposes only and does not constitute medical advice, diagnosis, or physician endorsement. If you are experiencing a medical emergency, please call 911 immediately.