What is John Shield's specialty?

John Shield (NPI 1033189634) is a Medicare-billing provider whose primary specialty is Internal Medicine in Sonora, CA.

Where does John Shield practice?

John Shield practices in Sonora, CA, based on the location reported in the CMS Medicare provider datasets for NPI 1033189634.

How much does Medicare pay John Shield?

John Shield (NPI 1033189634) received approximately $122K in total Medicare Part B payments, serving 910 beneficiaries, per the CMS Medicare Physician & Other Practitioners dataset.

PROVIDER PROFILE · NPI 1033189634

John ShieldMD

PRACTICESONORA COMMUNITY HOSPITALSee all providers at this practice →

Internal MedicineSonora, CAI

MEDICARE UTILIZATION · PART B · 2024

Total beneficiaries

2,555

Unique beneficiaries

—

Total services

4,061

Distinct HCPCS

Medicare payment

$120K

Peer benchmark

Total Medicare services vs. 10,499 Internal Medicine providers in CA — top quintile (cohort median 531).

PRESCRIBING · PART D · 2024

Total Rx claims

8,815

Beneficiaries

—

Total drug cost

$870K

Distinct drugs

103

Brand share

20.0%

Top prescribed drugs

Amlodipine Besylate583 claims

Losartan Potassium456 claims

Valsartan455 claims

Atorvastatin Calcium436 claims

Levothyroxine Sodium355 claims

QUALITY · MIPS · 2024

Final MIPS score

84.8

Quality

81.7

Cost

67.3

Improvement activities

40.0

Promoting interop.

97.0

Payment adjustment

0.41%

Group

INDUSTRY PAYMENTS · OPEN PAYMENTS · 2025

No data available for this provider in 2025.

FACILITY AFFILIATIONS

Hospital & Facility Affiliations (6)

Home health agency

Home health agency

Home health agency

Hospital

Hospital

Hospital

REFERRAL NETWORK

Where John Shield'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). 36 inbound referrers · 79 outbound destinations.

Receives referrals from

Inbound — who sends patients here

Physician	Patients	Visits
Jason Hwang Diagnostic Radiology · Oakland, CA	112	464
SONORA COMMUNITY HOSPITAL	94	369
Eric Hemminger Cardiology · Englewood, CO	74	421
Perry Haugen Ophthalmology · Sonora, CA	61	350
Joanne Rios Certified Clinical Nurse Specialist · Sonora, CA	53	532
Shalom Margolis Specialist · Sonora, CA	47	229
James Comazzi Specialist · Sonora, CA	47	318
County Of Tuolumne Ambulance Service Provider · Sonora, CA	38	197
Daniel Dubose Otolaryngology · Sonora, CA	38	285
David Allen Internal Medicine · Sonora, CA	32	102
NPI 1316976152	29	185
Artin Mahmoudi Pulmonary Disease · Ukiah, CA	20	237

Refers patients to

Outbound — where patients go next

Physician	Patients	Visits
SONORA COMMUNITY HOSPITAL	638	6,346
SONORA COMMUNITY HOSPITAL	563	4,933
Jason Hwang Diagnostic Radiology · Oakland, CA	142	546
Michael Maiman Diagnostic Radiology · Oakland, CA	130	440
Gregory Schaner Diagnostic Radiology · Oakland, CA	126	505
SONORA COMMUNITY HOSPITAL	97	342
Eric Hemminger Cardiology · Englewood, CO	93	550
Perry Haugen Ophthalmology · Sonora, CA	66	360
Rajiv Maraj Cardiology · Merced, CA	64	376
James Comazzi Specialist · Sonora, CA	61	313
George Chu Diagnostic Radiology · Walnut Creek, CA	56	237
Joanne Rios Certified Clinical Nurse Specialist · Sonora, CA	54	594

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