What is Chester Zahn's specialty?

Chester Zahn (NPI 1639146442) is a Medicare-billing provider whose primary specialty is Gastroenterology in San Gabriel, CA.

Where does Chester Zahn practice?

Chester Zahn practices in San Gabriel, CA, based on the location reported in the CMS Medicare provider datasets for NPI 1639146442.

How much does Medicare pay Chester Zahn?

Chester Zahn (NPI 1639146442) received approximately $240K in total Medicare Part B payments, serving 801 beneficiaries, per the CMS Medicare Physician & Other Practitioners dataset.

PROVIDER PROFILE · NPI 1639146442

Chester ZahnMD

GastroenterologySan Gabriel, CAI

MEDICARE UTILIZATION · PART B · 2024

Total beneficiaries

2,069

Unique beneficiaries

—

Total services

2,761

Distinct HCPCS

Medicare payment

$230K

Peer benchmark

Total Medicare services vs. 1,398 Gastroenterology providers in CA — top quintile (cohort median 750).

PRESCRIBING · PART D · 2024

Total Rx claims

3,053

Beneficiaries

—

Total drug cost

$252K

Distinct drugs

Brand share

18.3%

Top prescribed drugs

Bethanechol Chloride1,180 claims

Omeprazole622 claims

Isosorbide Mononitrate208 claims

Peg3350/Sod Sulf,bicarb,cl/Kcl167 claims

Entecavir110 claims

QUALITY · MIPS · 2024

Final MIPS score

75.0

Quality

15.0

Cost

97.4

Improvement activities

0.0

Promoting interop.

0.0

Payment adjustment

0.00%

Individual

INDUSTRY PAYMENTS · OPEN PAYMENTS · 2024

Total received

$296

Payment records

By payment type

Food and Beverage$264

Education$32

Top paying entities

Food and Beverage$264

Education$32

REFERRAL NETWORK

Where Chester Zahn'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). 88 inbound referrers · 0 outbound destinations.

Receives referrals from

Inbound — who sends patients here

Physician	Patients	Visits
AHMC SAN GABRIEL VALLEY MEDICAL	166	593
LIS, LEON	127	485
Wilson Wong Diagnostic Radiology · Arcadia, CA	124	423
Jose Tandoc Diagnostic Radiology · Arcadia, CA	114	420
NPI 1083649883	72	178
Unilab Corporation Clinical Laboratory · West Hills, CA	68	198
Aldric Shim Diagnostic Radiology · Monterey Park, CA	66	204
Sun Clinical Laboratories Clinical Laboratory · El Monte, CA	63	183
Daniel Garza Diagnostic Radiology · Alhambra, CA	61	160
YANG, BAO	59	212
ALAKOR HEALTHCARE LLC	59	112
Chin Shun Shih Internal Medicine · Monterey Park, CA	52	165

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