PROVIDER PROFILE · NPI 1548377997

William RiesenMD

Internal MedicineMason City, IAI

MEDICARE UTILIZATION · PART B · 2024

Total beneficiaries

2,570

Unique beneficiaries

—

Total services

3,848

Distinct HCPCS

Medicare payment

$113K

Peer benchmark

Total Medicare services vs. 418 Internal Medicine providers in IA — top quintile (cohort median 722).

PRESCRIBING · PART D · 2024

Total Rx claims

6,584

Beneficiaries

—

Total drug cost

$399K

Distinct drugs

102

Brand share

19.2%

Top prescribed drugs

Atorvastatin Calcium435 claims

Levothyroxine Sodium283 claims

Lisinopril270 claims

Losartan Potassium266 claims

Omeprazole233 claims

QUALITY · MIPS · 2024

Final MIPS score

0.0

Quality

0.0

Cost

0.0

Improvement activities

0.0

Promoting interop.

0.0

Payment adjustment

-9.00%

Group

INDUSTRY PAYMENTS · OPEN PAYMENTS · 2024

No data available for this provider in 2024.

REFERRAL NETWORK

Where William Riesen'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). 79 inbound referrers · 0 outbound destinations.

Receives referrals from

Inbound — who sends patients here

Physician	Patients	Visits
MERCY HEALTH SERVICES-IOWA CORP	958	12,095
Gary Swenson Diagnostic Radiology · Mason City, IA	210	548
Travis Petree Internal Medicine · Minot, ND	179	611
William Matthews Diagnostic Radiology · Mason City, IA	166	562
JANSON, BRAD	149	391
Robert Berg Interventional Radiology · Mason City, IA	148	419
Byron Beasley Cardiology · Mason City, IA	128	653
NPI 1104933142	120	874
HARLAN, BRUCE	120	893
Ryan Smith Diagnostic Radiology · Mason City, IA	112	423
Satinderjit Singh Emergency Medicine · Mason City, IA	108	364
Gholam Zadeii Internal Medicine · Rancho Mirage, CA	100	428

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