Stephen B. Martinez, MD
Dermatology Physician · Fremont, CA
Stephen B. Martinez, MD is a dermatology physician with a practice address in Fremont, California, and NPI 1386729044, issued on Oct 25, 2006. Check the license (California A64598, as entered in NPPES) on the Medical Board of California; the Medicare figures below come from public CMS files.
- Name
- Stephen B. Martinez
- Credential
- MD
- Primary taxonomy
- Dermatology Physician 207N00000X
- License number
- A64598 CA
Self-reported in NPPES; status is on the state search - Practice location
- 39400 Paseo Padre Pkwy, Fremont, CA 94538
- Phone
- (510) 795-3000
- Enumerated
- Oct 25, 2006
- Record last updated
- Dec 13, 2021 (not updated in 5 years: call before relying on the address or phone)
- Medicaid ID
- 00A645980 CA
- Medicare enrollment
- Enrolled (PECOS I20110510000576); accepts Medicare assignment
- Medical or professional school
- University Of California, Davis School Of Medicine, 1996
- Entity
- Type 1 · individual
8 nearest dermatology physician records → All 2,083 in California → Look up another NPI →
Also registered at 39400 Paseo Padre Pkwy
A shared address usually means a shared clinic or building; it does not show who employs whom.
- Denise Agatep, LCSWCounselor1164584900
- Ujwala Agharkar, MDChild & Adolescent Psychiatry Physician1073685723
- Dolly Ahluwalia, RDRegistered Dietitian1659429157
- Tabassum Alam, MDHospitalist Physician1306921069
- Mary Alyono, MDAnesthesiology Physician1477631059
- Stephanie Aoki, PHDPsychologist1427721216
Verify Stephen B. Martinez in five checks
- 1IdentityNPI record in CMS NPPESNPI lookupConfirmed in NPPES
- 2LicenseActive license and public ordersMedical Board of California
Search for license A64598Check the board - 3Other statesLicenses and actions elsewhereDocInfo (FSMB)Not checked
- 4ExclusionsMedicare and Medicaid bansHHS-OIG exclusion listNot checked
- 5CertificationBoard certificationABMS AOA NCCPA AANPNot checked
40% fewer Medicare Part D claims than the average dermatology physician in 2024
478 Medicare Part D claims for 200 beneficiaries, against an average of 797 among the 12,802 providers of this specialty who prescribed in Part D. Brand-name drugs were 30% of claims.
Most prescribed
- Triamcinolone Acetonide51 claims
- Fluorouracil48 claims
- Calcipotriene39 claims
- Cosentyx Sensoready (2 Pens)33 claims
- Ketoconazole27 claims
- Fluocinonide26 claims
Source: CMS Medicare Part D Prescribers by Provider and Drug, 2024 (data.cms.gov). Part D covers prescriptions for Medicare patients only; drugs with fewer than 11 claims are not published.
Bills Medicare through one group practice
- Permanente Medical Group IncSan Leandro, CA
Source: CMS Doctors and Clinicians National Downloadable File (the group practices a clinician bills Medicare through) (data.cms.gov).
Stephen B. Martinez among 2,083 dermatology physician records in California
Stephen B. Martinez, MD is one of 2,083 dermatology physician records with a practice address in California. 83% of them appear in a Medicare file (Part D prescribing, MIPS, Open Payments or Medicare group billing); this one does. Its NPI, issued in 2006, is newer than 6% of them.
- NPI issued2006 · 6% of these records are older, 56% newer
- In a Medicare fileYes · 83% of these records are
- In the CMS Doctors and Clinicians fileYes · 70% of these records are
- Graduated1996 · median 2006 among the 1,450 with a school on file
- Record last updated2021 · 58% of these records were not updated in five years or more
Source: CMS NPPES, file of Aug 9, 2026, every record with primary taxonomy 207N00000X and a California practice address; Medicare files: CMS Part D Prescribers 2024, MIPS 2023, Open Payments 2024, Doctors and Clinicians (data.cms.gov).
Dermatology Physician providers in California
There are 2,083 dermatology physician records in California.
All 2,083 in California → Every provider in Fremont → Dermatology Physician nationwide →
The 8 dermatology physician records with the nearest ZIP codes
- Jeffrey Carmel, MDFremont, CA 945381235109893
- Charles Chiang, M.DFremont, CA 945381780889519
- Sunil Dhawan, MDFremont, CA 945381326018987
- Stephanie Friduss, MDFremont, CA 945381215012976
- David Gorsulowsky, MDFremont, CA 945381649272832
- Tatiana Grzeszkiewicz, M.D., PH.D.Fremont, CA 945381841386489
- Ellen Haddock, MDFremont, CA 945381851823454
- Matthew Kanzler, MDFremont, CA 945381629032271
Common questions
What is Stephen B. Martinez, MD's NPI number?
Stephen B. Martinez, MD's National Provider Identifier (NPI) is 1386729044, issued on Oct 25, 2006. An NPI identifies a provider in billing; it is not a license.
Where is Stephen B. Martinez, MD located?
The NPPES record lists a practice address at 39400 Paseo Padre Pkwy, Fremont, CA, 94538. Phone: (510) 795-3000. Providers update this record themselves, so call before visiting.
How can I verify Stephen B. Martinez, MD's license?
NPPES lists California license number A64598, as entered by the provider. Search the Medical Board of California at https://www.mbc.ca.gov/License-Verification/default.aspx. The NPPES record confirms identity only; the state search shows license status, expiration and public orders.
How much does Stephen B. Martinez, MD prescribe under Medicare Part D?
In 2024, Stephen B. Martinez, MD had 478 Medicare Part D claims for 200 beneficiaries; the average among dermatology physician prescribers was 797. Part D covers Medicare prescriptions only.
Source: CMS National Plan and Provider Enumeration System (NPPES), file of Aug 9, 2026 (NPPES files on CMS.gov); NUCC Health Care Provider Taxonomy. Medicare files from data.cms.gov. An NPI identifies who bills; it is not a license.
Figures on PlainDoctor are read from the federal files each page names (CMS NPPES, Medicare Part D, MIPS, Open Payments; the HHS-OIG exclusion list only as counts) and from Census population estimates, with the file date shown beside them. See our editorial standards & corrections policy, the methodology behind these numbers, or report a data error. Data current as of Aug 9, 2026.