NPPES file of Aug 9, 2026

John M. Gundzik, M.D.

Diagnostic Radiology Physician · Bakersfield, CA

John M. Gundzik, M.D. is a diagnostic radiology physician with a practice address in Bakersfield, California, and NPI 1659390995, issued on Jul 18, 2006. Check the license (California A51755, as entered in NPPES) on the Medical Board of California; the Medicare figures below come from public CMS files.

Record from CMS NPPES, file of Aug 9, 2026 · Medicare files 2023 · method · Verify with CMS →

NPPES recordNPPES file of Aug 9, 2026
1659390995
Name
John M. Gundzik
Credential
M.D.
Primary taxonomy
Diagnostic Radiology Physician 2085R0202X
License number
A51755 CA
Self-reported in NPPES; status is on the state search
Practice location
2301 Bahamas Dr, Bakersfield, CA 93309
Phone
(661) 326-9600
Enumerated
Jul 18, 2006
Record last updated
Aug 16, 2011 (not updated in 15 years: call before relying on the address or phone)
Fax
(661) 334-3065
Medicare enrollment
Enrolled (PECOS I20081209000459); accepts Medicare assignment
Medical or professional school
University Of Cincinnati College Of Medicine, 1986
Entity
Type 1 · individual
Public record from CMS NPPES (open it on the CMS NPI Registry). Enrollment, assignment, school and telehealth: CMS Doctors and Clinicians file, Aug 2026. A record is not a license: verify it with the state board.
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Also registered at 2301 Bahamas Dr

A shared address usually means a shared clinic or building; it does not show who employs whom.

  1. Isaac Bornstein, M.D.Diagnostic Radiology Physician1225053101
  2. Rachel Brock, M.D.Diagnostic Radiology Physician1174656110
  3. Stephen Denaro, M.D.Diagnostic Radiology Physician1598975328
  4. William Dunn, M.D.Diagnostic Radiology Physician1871512111
  5. Dawn Engelkemier, M.D.Pediatric Radiology Physician1306049499
  6. Waad Hanna, M.D.Diagnostic Radiology Physician1386893006

Verify John M. Gundzik in five checks

  1. 1IdentityNPI record in CMS NPPESNPI lookupConfirmed in NPPES
  2. 2LicenseActive license and public ordersMedical Board of California
    Search for license A51755    Check the board
  3. 3Other statesLicenses and actions elsewhereDocInfo (FSMB)Not checked
  4. 4ExclusionsMedicare and Medicaid bansHHS-OIG exclusion listNot checked
  5. 5CertificationBoard certificationABMS AOA NCCPA AANPNot checked
Open the California license search

PlainDoctor does not match the HHS-OIG exclusion list to individual records: most entries carry no NPI. Search the OIG exclusion list by name.

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The practice group's MIPS final score for 2023 (Medicare payment program): 92.6 of 100

The Merit-based Incentive Payment System score is reported for the practice group, not for one clinician alone. Four categories are weighted into the final score; the average among 454,083 clinicians with a measured score was 83.5.

  1. Qualityout of 100 · 30% of the final score75.0
  2. Costnot scored (reweighted)
  3. Promoting interoperabilityout of 100 · 25%100.0
  4. Improvement activities40 of 40 points · 15%100.0

Source: CMS Quality Payment Program, MIPS performance year 2023, group reporting; category weights for 2023 (qpp.cms.gov).

Bills Medicare through one group practice

  1. Kern Radiology Medical Group IncBakersfield, CA

Source: CMS Doctors and Clinicians National Downloadable File (the group practices a clinician bills Medicare through) (data.cms.gov).

Diagnostic Radiology Physician providers in California

There are 4,500 diagnostic radiology physician records in California.

All 4,500 in California → Every provider in Bakersfield →

Other diagnostic radiology physician records in California

  1. Jason Aaronson, MDLos Angeles, CA1023145463
  2. Brianna Abadie, M.D.Van Nuys, CA1861811291
  3. Kenric Aban, M.D.Oceanside, CA1336218023
  4. Pablo Abbona, MDLos Angeles, CA1689856239
  5. Rashed AbdelaalRiverside, CA1518726090
  6. Ahmed Abdelhalim, MDRiverside, CA1275162927
  7. Fatemeh Abdollahi Mofakham, MDLos Angeles, CA1659652915
  8. Bennett Abe, MDVisalia, CA1184731283
  9. Stephen Abedon, M.D.Daly City, CA1689628687
  10. Richard Abello, M.D.La Jolla, CA1245205996

Common questions

What is John M. Gundzik, M.D.'s NPI number?

John M. Gundzik, M.D.'s National Provider Identifier (NPI) is 1659390995, issued on Jul 18, 2006. An NPI identifies a provider in billing; it is not a license.

Where is John M. Gundzik, M.D. located?

The NPPES record lists a practice address at 2301 Bahamas Dr, Bakersfield, CA, 93309. Phone: (661) 326-9600. Providers update this record themselves, so call before visiting.

How can I verify John M. Gundzik, M.D.'s license?

NPPES lists California license number A51755, 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.

What is John M. Gundzik, M.D.'s MIPS final score?

The 2023 MIPS final score is 92.6 of 100, reported for the practice group. The average among 454,083 clinicians with a measured score was 83.5.

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.

Written with AI tools from the named public files; every figure is computed from those files (how it is made).

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.