Recently Updated NPI Information — some details in this NPI profile have been updated in the NPI registry within the last 60 days.

DR. JOHN WESLEY PATRESAN MD
NPI 1023644978
Internal Medicine - Hematology & Oncology in Martinez, CA

Q: What is John Patresan's NPI number?

The NPI number for John Patresan is 1023644978. It was assigned to this individual provider in the NPPES registry on March 22, 2020.

Q: What is John Patresan's specialty?

The primary specialty registered for this NPI is Internal Medicine, specializing in Hematology & Oncology, with taxonomy code 207RH0003X.

Q: When was this NPI record last updated?

The NPPES record for John Patresan was last updated on August 8, 2026. NPI Profile syncs weekly with the NPPES registry data releases published by CMS. This NPI record was last updated 13 days ago. If this record has changed at CMS more recently, you can request an on-demand re-check against the live CMS registry, directly from this page.

Active since March 22, 2020PECOS Enrolled

2500 ALHAMBRA AVE, MARTINEZ, CA 94553(925) 370-5000 Get Directions Write a Review

NPPES record last updated: August 8, 2026. Verified against the NPPES registry weekly; last sync: August 16, 2026.

Record update history: Aug 8, 2026, Mar 22, 2020 (2 updates tracked since 2020).

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About Dr. John Wesley Patresan Md NPPES

Official registry information on file with the National Plan and Provider Enumeration System.

DR. JOHN WESLEY PATRESAN MD (NPI 1023644978) is an individual hematology & oncology provider in Martinez, California, licensed in California (A205802) and active in the NPI registry since March 2020. He is enrolled in Medicare PECOS and is a graduate of Other (2020).

NPPES Registry Identity

NPI1023644978

Entity TypeIndividualMale

Primary Taxonomy207RH0003X

Provider Legal NameDR. JOHN WESLEY PATRESANCredential: MD

Location Address2500 ALHAMBRA AVEMartinez, CA 94553-3156

Mailing Address2500 Alhambra AveMartinez, CA 94553-3156 · (209) 207-4069

Phone(925) 370-5000

Sole ProprietorNo

Medical School CMSOtherGraduated 2020

Enumeration DateMarch 22, 2020

Last NPPES UpdateAugust 8, 20262 updates tracked since enumeration

NPPES CertifiedAugust 8, 2026

✔ NPI 1023644978 is a valid, active identifier and passes the ISO check-digit test.

Specialties & Licenses

★ Primary SpecialtyInternal Medicine · Hematology & OncologyAllopathic & Osteopathic Physicians

Taxonomy Code207RH0003X

License✔ Licensed in CA · A205802

Definition

An internist doctor of osteopathy that specializes in the treatment of the combination of hematology and oncology disorders. A doctor of osteopathy that is board eligible/certified by the American Osteopathic Board of Internal Medicine WAS able to obtain a Certificate of Special Qualifications in the field of Hematology and Oncology. The Certificate is NO longer offered.

2500 ALHAMBRA AVE, Martinez, CA 94553

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Medicare Participation & PECOS CMS

Medicare enrollment, assignment, and ordering and referring status from the CMS PECOS system.

Medicare Enrollment Status

✔

Enrolled in Medicare (PECOS)

Dr. John Wesley Patresan Md is registered in the CMS Provider Enrollment, Chain and Ownership System (PECOS).

PECOS PAC ID2668827668

PECOS Enrollment IDI20260713000809

Eligible to Order & Refer✔ Part B Labs & Imaging✔ Durable Medical Equipment✔ Home Health Agency✔ Power Mobility DevicesPer the CMS Ordering and Referring file. Eligibility means Medicare pays claims that this provider orders or refers for these categories.

Physician Visit Costs CMS claims · ZIP area

Typical Medicare office-visit costs in the 94553 ZIP code area, from fee-for-service claims. These are area statistics, not this provider’s prices; actual charges vary by service and coverage.

New Patient

$202.35 typical visit price

range $69.00 – $202.35

Typical copayment $50.58 (range $17.25 – $50.58)

Most-billed visit code 99205

Established Patient

$119.48 typical visit price

range $23.44 – $166.46

Typical copayment $29.87 (range $5.86 – $41.61)

Most-billed visit code 99214

Amounts reflect what Medicare beneficiaries in this ZIP area are typically charged for office visits. Patients with other coverage should check their individual plans.

Other Providers at the Same Location NPPES 20

Providers registered at the same practice address, or within the immediate area, according to the NPPES registry.

JOHN S HAWKINS

Family Medicine