Dermatologists · California

Dermatologists in Modesto

11 dermatologists with a practice in Modesto, CA, with their specialty, address and phone number. Call the practice to book.

From the federal NPI Registry, downloaded 2026-11-04. No paid or sponsored listings. Call the practice to book.

About this list

The NPI Registry is the U.S. government's public register of clinicians, run by CMS. Where a doctor's own practice or hospital page lists training, languages or focus areas, we add them with a link to that page. Pori does not rank, rate or endorse anyone here and is paid by no one to list them. Call the practice to check it takes new patients and your insurance. Is this your listing? Update it in NPPES and it changes here at our next refresh, or email hello@getpori.app to correct or remove it.

Dr. Thomas G. Salopek, MD

DermatologySutter Valley Medical Foundation
600 Coffee Rd
Modesto, CA 95355
More details
Medical licence
CA #C51317
NPI issued
2006
Registry details updated 2026.

Dr. Lily Park, DO

Dermatology
600 Coffee Rd
Modesto, CA 95355
More details
Also registered as
Hospitalist, Internal Medicine
Medical licence
CA #12765, CA #20A12765, MI #5101018747, OR #DO184048
Also sees patients at
375 Se Norton Ln Ste C, Mcminnville, OR 97128 · (503) 362-8385
Also sees patients at
1390 Waverly Dr Se, Albany, OR 97322 · (503) 362-8385
NPI issued
2010
Registry details updated 2024.

Dr. Catherine A. Biren, MD

DermatologyGolden State Dermatology Associates Inc
1324 Nelson Ave Ste B
Modesto, CA 95350
More details
Also registered as
Specialist
Medical licence
CA #G48190, CA #GR0045780
Also sees patients at
Csi Medical Group, 9781 Blue Larkspur Ln Ste 100, Monterey, CA 93940 · (831) 333-9008
NPI issued
2005 · solo practice
Registry details updated 2023.

Dr. Daniel J. Trozak, MD

Procedural DermatologyDaniel J. Trozak, M.d., A.p.c.
1444 Florida Ave Ste 201
Modesto, CA 95350
More details
Medical licence
CA #C34265
NPI issued
2005 · solo practice
Registry details updated 2023.

Dr. Byron A. Knowles, MD, PhD

Dermatology
600 Coffee Rd
Modesto, CA 95355
More details
Medical licence
CA #A152031
Also sees patients at
751 S. Bascom Ave, San Jose, CA 95128 · (408) 885-5110
Also sees patients at
991 Montague Expy Ste 104, Milpitas, CA 95035 · (408) 263-6073
NPI issued
2016 · solo practice
Registry details updated 2021.

Dr. Marcus G. Connelly, MD

Dermatology
600 Coffee Rd
Modesto, CA 95355
More details
Medical licence
CA #C50251
NPI issued
2006
Registry details last updated in 2016: call to check they still practise here.

Dr. Gary Wagner, MD

DermatologySutter Valley Medical Foundation
600 Coffee Rd
Modesto, CA 95355
More details
Medical licence
CA #A24987
NPI issued
2006
Registry details last updated in 2016: call to check they still practise here.

Dr. Blake D. Alexander, MD

Dermatology · Mohs SurgeryCsi Medical Group
1101 Standiford Ave Suite A-3
Modesto, CA 95350
More details
Medical licence
CA #C52849
NPI issued
2006
Registry details last updated in 2014: call to check they still practise here.

Dr. Michael K. Zang, MD

DermatologySutter Valley Medical Foundation
600 Coffee Rd
Modesto, CA 95355
More details
Medical licence
CA #G68416
NPI issued
2006
Registry details last updated in 2011: call to check they still practise here.

Dr. Purita Z. Villanueva, MD

Procedural Dermatology
609 E Orangeburg Ave Suite 201
Modesto, CA 95350
More details
Medical licence
CA #A44551
NPI issued
2006 · solo practice
Registry details last updated in 2009: call to check they still practise here.

Dr. Thomas L. Hall, MD

Dermatology
4125 Bangs Ave
Modesto, CA 95356
More details
Medical licence
CA #G 45752
NPI issued
2005
Registry details last updated in 2007: call to check they still practise here.

Before your visit, Pori can track your skin with a photo scan, so you can show the dermatologist how it changed over weeks.

Questions

How many dermatologists are there in Modesto, CA?

The NPI Registry lists 11 dermatologists with a practice address in Modesto, CA: 3 women and 8 men.

Is there a Mohs surgeon in Modesto, CA?

1 of them list Mohs surgery, the layer-by-layer removal of skin cancer, as a specialty.

Is there a pediatric dermatologist in Modesto, CA?

None list pediatric dermatology as their registered specialty; most general dermatologists also see children.

How do I book a dermatologist?

Call the practice: ask whether they take new patients and your insurance, and how long the wait is. Many insurers need a referral from your primary care doctor first. For a quick opinion on a rash or spot, some dermatologists also answer photo consultations online.

When should I see a dermatologist rather than try products?

Book a visit for a mole or spot that changes, bleeds or looks unlike your others, a rash that spreads or hurts, acne that leaves scars or doesn't improve after three months of over-the-counter care, and any sudden hair or nail change. Products are for routine care, not for these.