James Patrick Tomas, MD
Nephrology Physician · San Bernardino, CA
James Patrick Tomas, MD is a nephrology physician with a practice address in San Bernardino, California, and NPI 1902040819, issued on Apr 22, 2009. Check the license (California A120476, as entered in NPPES) on the Medical Board of California; the Medicare figures below come from public CMS files.
- Name
- James Patrick Tomas
- Credential
- MD
- Primary taxonomy
- Nephrology Physician 207RN0300X
- License number
- A120476 CA
Self-reported in NPPES; status is on the state search - Practice location
- 401 E Highland Ave, San Bernardino, CA 92404
- Phone
- (909) 882-9150
- Enumerated
- Apr 22, 2009
- Record last updated
- Jun 24, 2014 (not updated in 12 years: call before relying on the address or phone)
- Fax
- (909) 883-8972
- Medicare enrollment
- Enrolled (PECOS I20170320001628); accepts Medicare assignment
- Entity
- Type 1 · individual
8 nearest nephrology physician records → All 1,468 in California → Look up another NPI →
Also registered at 401 E Highland Ave
A shared address usually means a shared clinic or building; it does not show who employs whom.
- Jay Agarwal, M.D.Nephrology Physician1326091737
- Elaine Agustin, N.P.Nurse Practitioner1992837843
- Dennis Anderson, M.D.Plastic Surgery Physician1609928803
- Brian Benson, PA-CPhysician Assistant1700943107
- William Boyle, PA-CPhysician Assistant1124053715
- Hakob Davtyan, M.D.Specialist1437180676
Verify James Patrick Tomas in five checks
- 1IdentityNPI record in CMS NPPESNPI lookupConfirmed in NPPES
- 2LicenseActive license and public ordersMedical Board of California
Search for license A120476Check the board - 3Other statesLicenses and actions elsewhereDocInfo (FSMB)Not checked
- 4ExclusionsMedicare and Medicaid bansHHS-OIG exclusion listNot checked
- 5CertificationBoard certificationABMS AOA NCCPA AANPNot checked
74% more Medicare Part D claims than the average nephrology physician in 2024
2,555 Medicare Part D claims for 269 beneficiaries, against an average of 1,465 among the 10,986 providers of this specialty who prescribed in Part D.
Most prescribed
- Allopurinol322 claims
- Rayaldee252 claims
- Lokelma138 claims
- Auryxia135 claims
- Losartan Potassium134 claims
- Veltassa131 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.
Industry payments in 2024: $147.37
8 payments; by number, the most common kind was food and beverage; the largest payer was GlaxoSmithKline, LLC. The 8,230 providers of this specialty with any payment received $3,091.37 on average. Payments are reported by manufacturers, not by the provider, and are not a sign of wrongdoing.
Source: CMS Open Payments, program year 2024 (openpaymentsdata.cms.gov); average among providers of this specialty with at least one payment.
Bills Medicare through 2 group practices
- Nephrology Associates Medical Group IncSan Bernardino, CA
- Riverside-San Bernardino County Indian Health IncBanning, CA
Source: CMS Doctors and Clinicians National Downloadable File (the group practices a clinician bills Medicare through) (data.cms.gov).
James Patrick Tomas among 1,468 nephrology physician records in California
James Patrick Tomas, MD is one of 1,468 nephrology physician records with a practice address in California. 88% of them appear in a Medicare file (Part D prescribing, MIPS, Open Payments or Medicare group billing); this one does. Its NPI, issued in 2009, is newer than 70% of them.
- NPI issued2009 · 70% of these records are older, 27% newer
- In a Medicare fileYes · 88% of these records are
- In the CMS Doctors and Clinicians fileYes · 77% of these records are
- Graduated2009 · median 2001 among the 1,128 with a school on file
- Record last updated2014 · 62% of these records were not updated in five years or more
Source: CMS NPPES, file of Aug 9, 2026, every record with primary taxonomy 207RN0300X and a California practice address; Medicare files: CMS Part D Prescribers 2024, MIPS 2023, Open Payments 2024, Doctors and Clinicians (data.cms.gov).
Nephrology Physician providers in California
There are 1,468 nephrology physician records in California.
All 1,468 in California → Every provider in San Bernardino → Nephrology Physician nationwide →
The 8 nephrology physician records with the nearest ZIP codes
- Jay Agarwal, M.D.San Bernardino, CA 924041326091737
- Daniel Hwang, M.D.San Bernardino, CA 924041629150081
- Sreesh Iyengar, MDSan Bernardino, CA 924041699069146
- Allan Kavalich, M.D.San Bernardino, CA 924041639178692
- Claudia Landis, MDSan Bernardino, CA 924041871655274
- Parag Mehtani, M.D.San Bernardino, CA 924041770773160
- Ashok Nath, M.D.,San Bernardino, CA 924041992951115
- Sapna Singh, MDSan Bernardino, CA 924041417585605
Common questions
What is James Patrick Tomas, MD's NPI number?
James Patrick Tomas, MD's National Provider Identifier (NPI) is 1902040819, issued on Apr 22, 2009. An NPI identifies a provider in billing; it is not a license.
Where is James Patrick Tomas, MD located?
The NPPES record lists a practice address at 401 E Highland Ave, San Bernardino, CA, 92404. Phone: (909) 882-9150. Providers update this record themselves, so call before visiting.
How can I verify James Patrick Tomas, MD's license?
NPPES lists California license number A120476, 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 James Patrick Tomas, MD prescribe under Medicare Part D?
In 2024, James Patrick Tomas, MD had 2,555 Medicare Part D claims for 269 beneficiaries; the average among nephrology physician prescribers was 1,465. 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.