John Wesley Patresan, MD
Hematology & Oncology Physician · Martinez, CA
John Wesley Patresan, MD is a hematology & oncology physician with a practice address in Martinez, California, and NPI 1023644978, issued on Mar 22, 2020. Check the license (California A205802, as entered in NPPES) on the Medical Board of California; the Medicare figures below come from public CMS files.
- Name
- John Wesley Patresan
- Credential
- MD
- Primary taxonomy
- Hematology & Oncology Physician 207RH0003X
- License number
- A205802 CA
Self-reported in NPPES; status is on the state search - Practice location
- 2500 Alhambra Ave, Martinez, CA 94553
- Phone
- (925) 370-5000
- Enumerated
- Mar 22, 2020
- Record last updated
- Aug 8, 2026
- Entity
- Type 1 · individual
8 nearest hematology & oncology physician records → All 1,583 in California → Look up another NPI →
Also registered at 2500 Alhambra Ave
A shared address usually means a shared clinic or building; it does not show who employs whom.
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- Edward AgyekumDentist1124196696
- Abid Ahmed, M.D.Internal Medicine Physician1346531001
Verify John Wesley Patresan in five checks
- 1IdentityNPI record in CMS NPPESNPI lookupConfirmed in NPPES
- 2LicenseActive license and public ordersMedical Board of California
Search for license A205802Check the board - 3Other statesLicenses and actions elsewhereDocInfo (FSMB)Not checked
- 4ExclusionsMedicare and Medicaid bansHHS-OIG exclusion listNot checked
- 5CertificationBoard certificationABMS AOA NCCPA AANPNot checked
93% fewer Medicare Part D claims than the average hematology & oncology physician in 2024
65 Medicare Part D claims for 31 beneficiaries, against an average of 877 among the 10,784 providers of this specialty who prescribed in Part D. 11 claims were for opioids.
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: $217.20
2 payments; by number, the most common kind was education; the largest payer was Incyte Corporation. The 8,560 providers of this specialty with any payment received $7,481.41 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.
John Wesley Patresan among 1,583 hematology & oncology physician records in California
John Wesley Patresan, MD is one of 1,583 hematology & oncology 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 2020, is newer than 97% of them.
- NPI issued2020 · 97% of these records are older, 2% newer
- In a Medicare fileYes · 83% of these records are
- In the CMS Doctors and Clinicians fileNo · 71% 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 207RH0003X and a California practice address; Medicare files: CMS Part D Prescribers 2024, MIPS 2023, Open Payments 2024, Doctors and Clinicians (data.cms.gov).
Hematology & Oncology Physician providers in California
There are 1,583 hematology & oncology physician records in California.
All 1,583 in California → Every provider in Martinez → Hematology & Oncology Physician nationwide →
The 8 hematology & oncology physician records with the nearest ZIP codes
- Rakesh Bhutani, MDMartinez, CA 945531619055795
- Robert Johnson, MDMartinez, CA 945531083792659
- Nelson Lim, MDMartinez, CA 945531093786592
- Lee Schwartz, M.D.Martinez, CA 945531356457857
- Lili Wang, M.D.Martinez, CA 945531942486246
- Paul Dugan, M.D.Napa, CA 945581992770069
- Sarah Fleisig, M.D.Napa, CA 945581275827941
- Daniel Mirda, M.D.Napa, CA 945581811963317
Common questions
What is John Wesley Patresan, MD's NPI number?
John Wesley Patresan, MD's National Provider Identifier (NPI) is 1023644978, issued on Mar 22, 2020. An NPI identifies a provider in billing; it is not a license.
Where is John Wesley Patresan, MD located?
The NPPES record lists a practice address at 2500 Alhambra Ave, Martinez, CA, 94553. Phone: (925) 370-5000. Providers update this record themselves, so call before visiting.
How can I verify John Wesley Patresan, MD's license?
NPPES lists California license number A205802, 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 John Wesley Patresan, MD prescribe under Medicare Part D?
In 2024, John Wesley Patresan, MD had 65 Medicare Part D claims for 31 beneficiaries; the average among hematology & oncology physician prescribers was 877. 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.