What is David Ishiyama's specialty?

David Ishiyama (NPI 1407177884) is a Medicare-billing provider whose primary specialty is Emergency Medicine in Grand Rapids, MI.

Where does David Ishiyama practice?

David Ishiyama practices in Grand Rapids, MI, based on the location reported in the CMS Medicare provider datasets for NPI 1407177884.

How much does Medicare pay David Ishiyama?

David Ishiyama (NPI 1407177884) received approximately $76K in total Medicare Part B payments, serving 545 beneficiaries, per the CMS Medicare Physician & Other Practitioners dataset.

PROVIDER PROFILE · NPI 1407177884

David IshiyamaM.D.

Emergency MedicineGrand Rapids, MII

MEDICARE UTILIZATION · PART B · 2024

Total beneficiaries

666

Unique beneficiaries

—

Total services

687

Distinct HCPCS

Medicare payment

$71K

Peer benchmark

Total Medicare services vs. 2,370 Emergency Medicine providers in MI — top quintile (cohort median 308).

PRESCRIBING · PART D · 2024

Total Rx claims

Beneficiaries

—

Total drug cost

$162

Distinct drugs

Brand share

71.4%

Top prescribed drugs

Hydrocodone/Acetaminophen18 claims

Ondansetron12 claims

Prednisone12 claims

QUALITY · MIPS · 2024

No data available for this provider in 2024.

INDUSTRY PAYMENTS · OPEN PAYMENTS · 2025

No data available for this provider in 2025.

REFERRAL NETWORK

Where David Ishiyama'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). 38 inbound referrers · 135 outbound destinations.

Receives referrals from

Inbound — who sends patients here

Physician	Patients	Visits
W.A. FOOTE MEMORIAL HOSPITAL, INC.	575	2,003
Samir Parikh Diagnostic Radiology · Jackson, MI	96	166
James Heisel Diagnostic Radiology · Jackson, MI	93	165
Mohammad Asad Diagnostic Radiology · Jackson, MI	93	161
ANDERSON, LIBBY	88	133
Waseem Ullah Diagnostic Radiology · Jackson, MI	71	119
Tareq Baghal Interventional Cardiology · Allen Park, MI	59	113
WILLIAMSON, DAVID	54	84
Mumtaz Memon Cardiology · Jackson, MI	53	92
Vishal Ruparelia Diagnostic Radiology · Royal Oak, MI	33	50
Jashu Patel Cardiology · Jackson, MI	30	47
Moiz Ali Internal Medicine · Fort Worth, TX	25	34

Refers patients to

Outbound — where patients go next

Physician	Patients	Visits
W.A. FOOTE MEMORIAL HOSPITAL, INC.	392	1,449
Jackson Community Ambulance Inc. Ambulance Service Provider · Ann Arbor, MI	236	535
PATEL, RENUKA	126	200
PATEL, PIYUSH	120	197
Cathy Glick Cardiology · Jackson, MI	112	225
SHENAI, BHASKAR	104	170
Eric Hoover Diagnostic Radiology · Jackson, MI	95	161
SMITH, MARK	86	114
Samir Parikh Diagnostic Radiology · Jackson, MI	86	134
Arvind Prabhu Cardiology · Jackson, MI	83	166
Sadasiva Reddy Diagnostic Radiology · Jackson, MI	72	121
Waseem Ullah Diagnostic Radiology · Jackson, MI	69	131

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