JOHN MUIR MAGNETIC IMAGING CENTER
NPI 1235184110
Radiology - Diagnostic Radiology in Walnut Creek, CA

Q: What is John Muir Magnetic Imaging Center's NPI number?

The NPI number for John Muir Magnetic Imaging Center is 1235184110. It was assigned to this organization in the NPPES registry on May 22, 2006.

Q: What is John Muir Magnetic Imaging Center's specialty?

The primary specialty registered for this NPI is Radiology, specializing in Diagnostic Radiology, with taxonomy code 2085R0202X.

Active since May 22, 2006

1601 YGNACIO VALLEY RD, WALNUT CREEK, CA 94598(925) 296-7156(925) 296-7174 Get Directions Write a Review

NPPES record last updated: March 18, 2026. Verified against the NPPES registry weekly; last sync: October 25, 2026.

Record update history: Mar 18, 2026, Oct 2, 2019, Oct 26, 2018 (3 updates tracked since 2018).

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About John Muir Magnetic Imaging Center NPPES

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

JOHN MUIR MAGNETIC IMAGING CENTER (NPI 1235184110) is a healthcare organization registered as a diagnostic radiology in Walnut Creek, California and active in the NPI registry since May 2006. The organization maintains 2 additional practice locations and lists Ronald Chan, Chairman, as its authorized official.

NPPES Registry Identity

NPI1235184110

Entity TypeOrganization

Primary Taxonomy2085R0202X

Legal Business NameJOHN MUIR MAGNETIC IMAGING CENTER

Location Address1601 YGNACIO VALLEY RDWalnut Creek, CA 94598-3122

Mailing Address2125 Oak Grove Rd, Suite 200Walnut Creek, CA 94598-2536 · (925) 296-7156 · Fax (925) 296-7174

Phone(925) 296-7156

Fax(925) 296-7174

Organization SubpartNo

Authorized OfficialRonald ChanChairman · (925) 296-7156

Enumeration DateMay 22, 2006

Last NPPES UpdateMarch 18, 20263 updates tracked since enumeration

NPPES CertifiedMarch 18, 2026

✔ NPI 1235184110 is a valid, active identifier and passes the ISO check-digit test.

Specialties & Licenses

★ Primary SpecialtyRadiology · Diagnostic RadiologyAllopathic & Osteopathic Physicians

Taxonomy Code2085R0202X

Definition

A radiologist who utilizes x-ray, radionuclides, ultrasound and electromagnetic radiation to diagnose and treat disease.

1601 YGNACIO VALLEY RD, Walnut Creek, CA 94598

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Secondary Practice Locations 2

Location 1177 La Casa ViaWalnut Creek, CA 94598-6101 · Phone (925) 295-1545

Location 22410 High School AveConcord, CA 94520-1829 · Phone (925) 687-5600

Group Practice 1

Group TaxonomyThis provdier is a business group of one or more individual practitioners, all of who practice with the same area of specialization.193400000X SINGLE SPECIALTY GROUP

Medicare Participation & PECOS CMS

Medicare enrollment and the clinicians who bill Medicare through this organization, from CMS.

Medicare Enrollment Status

✔

Enrolled in Medicare (PECOS)

John Muir Magnetic Imaging Center is registered in the CMS Provider Enrollment, Chain and Ownership System (PECOS).

Clinicians Billing Medicare Through This Organization

204

Medicare enrollment records show 204 clinicians reassign Medicare billing to John Muir Magnetic Imaging Center, which bills Medicare for the services they deliver. Of these, 1 practice at this address and 57 within 10 miles. Listed here are the 20 practicing nearest to this location.

Clinicians by Medicare Specialty 3

Diagnostic Radiology190

Interventional Radiology12

Nuclear Medicine2

Nearest to this location (20)

See all 204

Molly Honegger, M.D.

Diagnostic Radiology

NPI 1780648766

1601 YGNACIO VALLEY RD
Walnut Creek, CA 94598

(925) 296-7156

✔ PECOS✔ Accepts MedicareSame address

Usha Chundru Murphy, M.D.

Diagnostic Radiology

NPI 1174534341

2637 SHADELANDS DR
Walnut Creek, CA 94598

(925) 329-3710

✔ PECOS1.4 mi

Sunil Gandhi, M.D.

Diagnostic Radiology

NPI 1093757403

2125 OAK GROVE RD SUITE 200
Walnut Creek, CA 94598

(925) 296-7150

✔ PECOS1.7 mi

Keyvan Nouri, M.D.

Diagnostic Radiology

NPI 1184664997

2125 OAK GROVE RD SUITE 200
Walnut Creek, CA 94598

(925) 296-7150

✔ PECOS✔ Accepts Medicare1.7 mi

Aseem Rawal, M.D.

Diagnostic Radiology

NPI 1073554465

2125 OAK GROVE RD SUITE 200
Walnut Creek, CA 94598

(925) 296-7150

✔ PECOS✔ Accepts Medicare1.7 mi

Mark Tu, M.D.

Diagnostic Radiology

NPI 1144262452

2125 OAK GROVE RD SUITE 200
Walnut Creek, CA 94598

(925) 296-7150

✔ PECOS1.7 mi

Less Chafen, M.D.

Diagnostic Radiology

NPI 1336131689

2125 OAK GROVE RD #200
Walnut Creek, CA 94598

(925) 296-7150

✔ PECOS1.7 mi

Samuel Choi, M.D.

Diagnostic Radiology

NPI 1932135746

2125 OAK GROVE RD SUITE 200
Walnut Creek, CA 94598

(925) 296-7156

✔ PECOS✔ Accepts Medicare1.7 mi

William Hoddick, M.D.

Diagnostic Radiology

NPI 1922038314

2125 OAK GROVE RD SUITE 200
Walnut Creek, CA 94598

(925) 296-7150

✔ PECOS1.7 mi

David Howard, M.D.

Diagnostic Radiology

NPI 1467485334

2125 OAK GROVE RD SUITE 200
Walnut Creek, CA 94598

(925) 296-7150

✔ PECOS✔ Accepts Medicare1.7 mi

Vishal Panchal, M.D.

Diagnostic Radiology

NPI 1720279599

2125 OAK GROVE RD SUITE 200
Walnut Creek, CA 94598

(925) 296-7150

✔ PECOS1.7 mi

Saurabh Patel, M.D.

Diagnostic Radiology

NPI 1376587352

2125 OAK GROVE RD SUITE 200
Walnut Creek, CA 94598

(925) 296-7150

✔ PECOS1.7 mi

Jonathan Posin, M.D.

Diagnostic Radiology

NPI 1396780425

2125 OAK GROVE RD #200
Walnut Creek, CA 94598

(925) 296-7150

✔ PECOS1.7 mi

Kirk So, M.D.

Diagnostic Radiology

NPI 1780610345

2125 OAK GROVE RD SUITE 200
Walnut Creek, CA 94598

(925) 296-7150

✔ PECOS1.7 mi

Eric Tao, M.D.

Diagnostic Radiology

NPI 1912943655

2125 OAK GROVE RD SUITE 200
Walnut Creek, CA 94598

(925) 296-7150

✔ PECOS✔ Accepts Medicare1.7 mi

Christopher Tran, M.D.

Diagnostic Radiology

NPI 1831126952

2125 OAK GROVE RD SUITE 200
Walnut Creek, CA 94598

(925) 296-7150

✔ PECOS✔ Accepts Medicare1.7 mi

John Vanuden, M.D., PH.D.

Diagnostic Radiology

NPI 1750505145

2125 OAK GROVE RD SUITE 200
Walnut Creek, CA 94598

(925) 296-7150

✔ PECOS✔ Accepts Medicare1.7 mi

Vivian Wing, M.D.

Diagnostic Radiology

NPI 1780620088

2125 OAK GROVE RD SUITE 200
Walnut Creek, CA 94598

(925) 296-7156

✔ PECOS✔ Accepts Medicare1.7 mi

Vincent Wong, MD

Diagnostic Radiology

NPI 1366691099

2125 OAK GROVE RD SUITE 200
Walnut Creek, CA 94598

(925) 296-7150

✔ PECOS✔ Accepts Medicare1.7 mi

Alex Penn

Interventional Radiology

NPI 1972881159

2125 OAK GROVE RD STE 200
Walnut Creek, CA 94598

(925) 296-7150

✔ PECOS✔ Accepts Medicare1.7 mi

See all 204 clinicians

Source: CMS Revalidation Reassignment List, October 2026 release. Reassignment records can lag staffing changes; confirm a current affiliation with the organization.

Frequently Asked Questions NPPES & CMS

Common questions about this NPI record, answered from the official NPPES registry and CMS datasets shown on this page.

What is John Muir Magnetic Imaging Center's NPI number?

The NPI number for John Muir Magnetic Imaging Center is 1235184110. It was assigned to this organization in the NPPES registry on May 22, 2006.

Where is John Muir Magnetic Imaging Center located?

John Muir Magnetic Imaging Center is located at 1601 Ygnacio Valley Rd, Walnut Creek, CA 94598. The listed phone number is (925) 296-7156.

What is John Muir Magnetic Imaging Center's specialty?

The primary specialty registered for this NPI is Radiology, specializing in Diagnostic Radiology, with taxonomy code 2085R0202X.

Is John Muir Magnetic Imaging Center enrolled in Medicare?

Yes. John Muir Magnetic Imaging Center is registered in the Medicare PECOS enrollment system.

How many clinicians bill Medicare through John Muir Magnetic Imaging Center?

According to the CMS Revalidation Reassignment List (October 2026 release), 204 clinicians in 3 Medicare specialties reassign their Medicare billing to John Muir Magnetic Imaging Center. A reassignment is filed with Medicare on form CMS-855R, signed by both the clinician and the organization, and lets the organization bill Medicare and receive payment for the clinician's services. The largest specialties are Diagnostic Radiology (190), Interventional Radiology (12) and Nuclear Medicine (2). Of these, 1 practice at this address and 57 within 10 miles. Reassignment records can lag staffing changes; confirm a current affiliation with the organization.

When was this NPI record last updated?

The NPPES record for John Muir Magnetic Imaging Center was last updated on March 18, 2026. NPI Profile syncs weekly with the NPPES registry data releases published by CMS. This NPI record was last updated 7 months 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.