Robert J. Roth, MD
Dermatology Physician · Fremont, CA
Robert J. Roth, MD is a dermatology physician with a practice address in Fremont, California, and NPI 1205807864, issued on Jan 31, 2006. Check the license (California C25011, as entered in NPPES) on the Medical Board of California; the Medicare figures below come from public CMS files.
- Name
- Robert J. Roth
- Credential
- MD
- Primary taxonomy
- Dermatology Physician 207N00000X
- License number
- C25011 CA
Self-reported in NPPES; status is on the state search - Practice location
- 2557 Mowry Ave, Fremont, CA 94538
- Phone
- (510) 797-4111
- Enumerated
- Jan 31, 2006
- Record last updated
- Jul 13, 2026
- Fax
- (410) 797-3320
- Entity
- Type 1 · individual
8 nearest dermatology physician records → All 2,083 in California → Look up another NPI →
Also registered at 2557 Mowry Ave
A shared address usually means a shared clinic or building; it does not show who employs whom.
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- Jeffrey Carmel, MDDermatology Physician1235109893
- Harman Chawla, M.D.Infectious Disease Physician1518251701
- Jason Chu, M.D.Pulmonary Disease Physician1972521060
- Sunil Dhawan, MDDermatology Physician1326018987
- Dale Elleson, DOOtolaryngology Physician1740226000
Verify Robert J. Roth in five checks
- 1IdentityNPI record in CMS NPPESNPI lookupConfirmed in NPPES
- 2LicenseActive license and public ordersMedical Board of California
Search for license C25011Check the board - 3Other statesLicenses and actions elsewhereDocInfo (FSMB)Not checked
- 4ExclusionsMedicare and Medicaid bansHHS-OIG exclusion listNot checked
- 5CertificationBoard certificationABMS AOA NCCPA AANPNot checked
98% fewer Medicare Part D claims than the average dermatology physician in 2024
15 Medicare Part D claims, against an average of 797 among the 12,802 providers of this specialty who prescribed in Part D.
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.
Robert J. Roth among 2,083 dermatology physician records in California
Robert J. Roth, 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 fileNo · 70% of these records are
- Record last updated2026 · 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 Robert J. Roth, MD's NPI number?
Robert J. Roth, MD's National Provider Identifier (NPI) is 1205807864, issued on Jan 31, 2006. An NPI identifies a provider in billing; it is not a license.
Where is Robert J. Roth, MD located?
The NPPES record lists a practice address at 2557 Mowry Ave, Fremont, CA, 94538. Phone: (510) 797-4111. Providers update this record themselves, so call before visiting.
How can I verify Robert J. Roth, MD's license?
NPPES lists California license number C25011, 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 Robert J. Roth, MD prescribe under Medicare Part D?
In 2024, Robert J. Roth, MD had 15 Medicare Part D claims; 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.