What is John Gundzik's specialty?

John Gundzik (NPI 1659390995) is a Medicare-billing provider whose primary specialty is Diagnostic Radiology in Bakersfield, CA.

Where does John Gundzik practice?

John Gundzik practices in Bakersfield, CA, based on the location reported in the CMS Medicare provider datasets for NPI 1659390995.

How much does Medicare pay John Gundzik?

John Gundzik (NPI 1659390995) received approximately $1.2M in total Medicare Part B payments, serving 1,887 beneficiaries, per the CMS Medicare Physician & Other Practitioners dataset.

PROVIDER PROFILE · NPI 1659390995

John GundzikM.D.

PRACTICEKERN RADIOLOGY MEDICAL GROUP, INCSee all providers at this practice →

Diagnostic RadiologyBakersfield, CAI

MEDICARE UTILIZATION · PART B · 2024

Total beneficiaries

2,900

Unique beneficiaries

—

Total services

43,832

Distinct HCPCS

Medicare payment

$1.1M

Peer benchmark

Total Medicare services vs. 3,474 Diagnostic Radiology providers in CA — top quintile (cohort median 2,975).

PRESCRIBING · PART D · 2024

No data available for this provider in 2024.

QUALITY · MIPS · 2024

Final MIPS score

92.4

Quality

75.0

Cost

77.2

Improvement activities

40.0

Promoting interop.

100.0

Payment adjustment

0.73%

Group

INDUSTRY PAYMENTS · OPEN PAYMENTS · 2025

No data available for this provider in 2025.

REFERRAL NETWORK

Where John Gundzik's patients come from & go

Directional shared-patient flow from Medicare claims — who sends patients to this provider (inbound) and where this provider's patients go next (outbound). 48 inbound referrers · 0 outbound destinations.

Receives referrals from

Inbound — who sends patients here

Physician	Patients	Visits
Pacific Point Laboratories, Inc. Clinical Laboratory · San Luis Obispo, CA	259	471
DIGNITY HEALTH	121	181
Richard Alexan-Shirabad Neurology · Bakersfield, CA	105	227
BAKERSFIELD MEMORIAL HOSPITAL	104	196
TYMINSKI, LEONARD	57	106
BORNSTEIN, ISAAC	52	90
Bernard Maristany Diagnostic Radiology · Bakersfield, CA	45	56
Unilab Corporation Clinical Laboratory · West Hills, CA	40	104
Alan Mortezaie Diagnostic Radiology · Bakersfield, CA	40	54
Rachel Brock Diagnostic Radiology · Bakersfield, CA	38	61
David Schale Diagnostic Radiology · Bakersfield, CA	37	45
Dawn Engelkemier Diagnostic Radiology · Bakersfield, CA	34	75

Refers patients to

Outbound — where patients go next

No outbound pairs above the suppression threshold.

Source: CMS Physician Shared Patient Patterns (30-day window, Medicare FFS). Direction = a beneficiary seen by the first provider, then the second, within 30 days; a proxy for referral, not a documented referral. Pairs with fewer than 11 shared beneficiaries are suppressed.

CROSS-REFERENCE

Related data on other Healthparse brands

ProviderScore

OIG/SAM exclusion screening, sanctions history

Healthparse Signals

Monitor this provider for changes — dated NPI change events