What is William Rietkerk's specialty?

William Rietkerk (NPI 1720311400) is a Medicare-billing provider whose primary specialty is Dermatology in Thousand Oaks, CA.

Where does William Rietkerk practice?

William Rietkerk practices in Thousand Oaks, CA, based on the location reported in the CMS Medicare provider datasets for NPI 1720311400.

How much does Medicare pay William Rietkerk?

William Rietkerk (NPI 1720311400) received approximately $704K in total Medicare Part B payments, serving 1,681 beneficiaries, per the CMS Medicare Physician & Other Practitioners dataset.

PROVIDER PROFILE · NPI 1720311400

William RietkerkMD MBA

DermatologyThousand Oaks, CAI

MEDICARE UTILIZATION · PART B · 2024

Total beneficiaries

6,279

Unique beneficiaries

—

Total services

15,411

Distinct HCPCS

Medicare payment

$692K

Peer benchmark

Total Medicare services vs. 1,546 Dermatology providers in CA — top quintile (cohort median 2,504).

PRESCRIBING · PART D · 2024

Total Rx claims

1,341

Beneficiaries

—

Total drug cost

$36K

Distinct drugs

Brand share

22.4%

Top prescribed drugs

Betamethasone Dipropionate197 claims

Ketoconazole170 claims

Ciclopirox Olamine165 claims

Triamcinolone Acetonide160 claims

Mupirocin117 claims

QUALITY · MIPS · 2024

Final MIPS score

85.2

Quality

74.5

Cost

82.7

Improvement activities

40.0

Promoting interop.

92.0

Payment adjustment

0.43%

Group

INDUSTRY PAYMENTS · OPEN PAYMENTS · 2024

Total received

$2K

Payment records

By payment type

Food and Beverage$2K

Education$100

Top paying entities

Food and Beverage$2K

Education$100

REFERRAL NETWORK

Where William Rietkerk'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). 8 inbound referrers · 0 outbound destinations.

Receives referrals from

Inbound — who sends patients here

Physician	Patients	Visits
Ameripath New York Llc Clinical Laboratory · White Plains, NY	36	51
UNIVERSITY HOSPITAL AT STONY BROOK	36	80
Quest Diagnostics Clinical Laboratories Inc Clinical Laboratory · Melville, NY	33	73
TAN, MARY ALDRENE	27	36
Sunrise Medical Laboratories, Inc. Clinical Laboratory · Hicksville, NY	25	43
CENTRAL SUFFOLK HOSPITAL	12	27
Kimberly Cossaro Physician Assistant · Smithtown, NY	12	33
Laboratory Corporation Of America Holdings Clinical Laboratory · Raritan, NJ	11	20

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