Dr. Willem J. Van Der Werf, MD
- Medicare services, 2024
- 41
- Medicare patients, 2024
- 61
- Part D claims, 2018
- 12
- Hospital affiliations
- 2
- Industry payments
- $6,546
- Practice address
- 350 West Thomas Road, Phoenix, AZ 85013
- Practice phone
- Call (602) 406-8225
- Professional email
- Get professional email
- Personal email
- Get personal email
- Mobile number
- Get mobile number
Find Dr. Van Der Werf's professional email, personal email and mobile number
Dmand AI checks each channel through healthcare-specific waterfall enrichment. See what is on file with a free account, with practice phones, licenses and affiliations.
Dr. Willem J. Van Der Werf is a transplant surgery physician in Phoenix, Arizona
Dr. Van Der Werf practices at Dignity Health St. Joseph's Hospital and Medical Center in Phoenix, Arizona, part of CommonSpirit Health.
Dr. Van Der Werf's NPI, 1275563397, was assigned on July 4, 2006. Dr. Van Der Werf graduated from University of California, San Francisco School of Medicine in 1988. Dr. Van Der Werf holds Arizona license 49927.
- NPI
- 1275563397NPI Registry (opens in a new tab)
- Medicare PAC ID
- 4385636737
- NPI enumeration date
- July 4, 2006
- NPI status
- Active
- Accepts Medicare assignment
- Yes
- Practice phone
- (602) 406-8225
- Professional email
- Get email
- Personal email
- Get email
- Mobile number
- Get number
- Sex
- Male
- Estimated age
- 64
- Medical school graduation
- 1988
Sources: NPPES NPI Registry (CMS); Dmand AI Professional Profile Data; Dmand AI Affiliation Data; and Doctors and Clinicians National Downloadable File (CMS)
Dr. Willem J. Van Der Werf practices at Dignity Health St. Joseph's Hospital and Medical Center in Phoenix, Arizona
Dr. Van Der Werf's primary practice is Dignity Health St. Joseph's Hospital and Medical Center, at 350 West Thomas Road, Phoenix, AZ 85013 in Maricopa County. The practice phone is (602) 406-8225.
- Dignity Health St. Joseph's Hospital and Medical Center350 West Thomas Road, Phoenix, AZ 85013 · Maricopa CountyPhone(602) 406-8225
Source: Dmand AI Affiliation Data
Dr. Willem J. Van Der Werf is affiliated with 4 sites of care and 2 medical groups
Dr. Van Der Werf's primary practice is Dignity Health St. Joseph's Hospital and Medical Center in Phoenix, Arizona, part of CommonSpirit Health. Dr. Van Der Werf is also affiliated with Banner - University Medical Center Phoenix. The medical group on file is Arizona Transplant Associates. Dmand AI also links Dr. Van Der Werf to 2 more group practices and clinics and 1 medical group, each named with a free account.
Sources: Dmand AI Affiliation Data; and Dmand AI Org Hierarchy Data
Dmand AI tracks the EHR system at Dr. Willem J. Van Der Werf's practice
Dmand AI tracks the electronic health record (EHR) system at each site where Dr. Van Der Werf practices, 4 sites in all. Vendor and product names are available with a free account.
| Site | EHR vendor and product |
|---|---|
| Dignity Health St. Joseph's Hospital and Medical Center | Available with a free account |
| +3 more sites and 1 medical group | Available with a free account |
Source: Dmand AI Technology Install Data
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Dr. Willem J. Van Der Werf is one of 25 transplant surgery physicians in Arizona
Transplant surgery is Dr. Van Der Werf's primary specialty in the NPI Registry, under taxonomy code 204F00000X. Dmand AI has Dr. Van Der Werf's licenses on file in 2 states: Arizona and Utah.
Specialties and state licenses
- Transplant surgery, ArizonaPrimary
- Specialist, Utah
Transplant surgery physicians near Dr. Van Der Werf
Counts of transplant surgery physicians with a Dmand AI profile, by place and practice. Each opens the list.
Sources: NPPES NPI Registry (CMS); Dmand AI Professional Profile Data; and Dmand AI Peer Benchmarks
Dr. Willem J. Van Der Werf billed Medicare for 41 services in 2024
CMS data shows 41 Medicare services from Dr. Van Der Werf across 1 procedure code in 2024, for 61 Medicare patients. Medicare paid $2,457 for them. Every service was in a facility, such as a hospital, rather than an office.
Dr. Van Der Werf's Medicare services by type, 2023 to 2024
- 2023
- 2024
- Office and hospital visits
- 2023: 1022024: 4160%
Dr. Van Der Werf compared with the Arizona median for transplant surgery physicians, 2024
- Dr. Van Der Werf
- Arizona median
- Medicare services
- 41vs 9758% below
- Medicare patients
- 61vs 577% above
- Part D claims
- 12vs 4271% below
Medians across 22 transplant surgery physicians in Arizona with Dmand AI profiles that report each measure.
Dr. Van Der Werf's most billed Medicare procedure codes, 2024
CMS publishes codes billed for 11 or more Medicare patients. Each label is the code family; CPT descriptions are licensed by the AMA.
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Medicare shows one payer. Book a meeting to get commercial claims data for Dr. Van Der Werf and other transplant surgery physicians in Arizona.
Sources: Medicare Physician & Other Practitioners - by Provider and Service (CMS), 2024 data; and Dmand AI Peer Benchmarks
Dr. Willem J. Van Der Werf treated 61 Medicare patients in 2024, average age 67
CMS counts 61 Medicare patients who saw Dr. Van Der Werf in 2024. The largest group is 65 to 74, with 38 patients. 75% of them have high blood pressure, and 75% have high cholesterol. 20% are also on Medicaid. Their average risk score is 4.01, where 1.00 is the Medicare average, so they are sicker than most Medicare patients.
Across all payers, Dmand AI patient panel data puts Dr. Van Der Werf's median patient age at 66, with 49% women.
Dr. Van Der Werf's Medicare patients by age, 2024
CMS leaves out age groups with fewer than 11 patients.
Dr. Van Der Werf's Medicare patients by sex, 2024
- Women2744%
- Men3456%
Chronic conditions among Dr. Van Der Werf's Medicare patients, 2024
- High blood pressure75%
- High cholesterol75%
- Chronic kidney disease56%
- Diabetes54%
- Arthritis30%
- Ischemic heart disease30%
- Cancer23%
- Heart failure23%
Share of Medicare patients with each condition. A patient can have several.
Dr. Van Der Werf's patients across all payers
Dmand AI patient panel data covers Medicare, Medicaid and commercial patients.
Patient panel by age, all payers
Median age 66
Patient panel by sex, all payers
- Women49%
- Men48%
Sources: Dmand AI Patient Panel Data; and Medicare Physician & Other Practitioners - by Provider (CMS), 2024 data
Dr. Willem J. Van Der Werf wrote 12 Medicare Part D claims in 2018
In 2018, Dr. Van Der Werf wrote 12 Medicare Part D claims. Every claim was for a generic drug. They cover 1 drug, with $3,445 in total drug cost. In 2017, CMS named 49 claims across 3 drugs.
Dr. Van Der Werf's most prescribed drugs by claims, 2018
CMS names a drug when it has 11 or more claims. Share is of the claims for drugs CMS names.
Part D claims for drugs CMS names, 2017 to 2018
- 2017
- 2018
- Claims for drugs CMS names
- 2017: 492018: 1276%
Drugs named by CMS: 1 in 2018, 3 in 2017.
Source: Medicare Part D Prescribers - by Provider and Drug (CMS), 2024 data, released May 6, 2026
How Dr. Willem J. Van Der Werf takes part in Medicare
Dr. Van Der Werf accepts Medicare assignment, so Medicare's approved amount is taken as full payment.
- Accepts Medicare assignment
- Yes
Source: Doctors and Clinicians National Downloadable File (CMS)
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Dr. Willem J. Van Der Werf received $6,546 in industry payments from 2020 to 2025
CMS Open Payments shows 12 general payments to Dr. Van Der Werf from 3 drug and device companies from 2020 to 2025. Education make up the largest share, 92% of the total. Intuitive Surgical, Inc. paid the most, $6,041.
General payments to Dr. Van Der Werf by program year, 2020 to 2025
General payments to Dr. Van Der Werf by kind, 2020 to 2025
- Education$6,00092%
- Food and beverage$5468%
Companies that paid Dr. Van Der Werf the most, 2020 to 2025
Share is of all general payments to this clinician.
Source: Open Payments (CMS), 2025 data, released July 7, 2026
Dr. Willem J. Van Der Werf graduated from University of California, San Francisco School of Medicine
Dr. Van Der Werf graduated from University of California, San Francisco School of Medicine in 1988.
- Medical school
Source: Dmand AI Professional Profile Data
Sources for Dr. Willem J. Van Der Werf's profile data
| Data on this page | Source |
|---|---|
| NPI, name, sex, specialty and licenses | NPPES NPI Registry (CMS) (opens in a new tab)Dmand AI Professional Profile Data |
| Practice locations and phone | Dmand AI Affiliation Data |
| Primary practice, affiliations and health system | Dmand AI Affiliation DataDmand AI Org Hierarchy Data |
| Medicare services and procedure codes | Medicare Physician & Other Practitioners - by Provider and Service (CMS) (opens in a new tab) |
| State medians for the same specialty | Dmand AI Peer Benchmarks |
| Medicare patients and the all-payer patient panel | Dmand AI Patient Panel DataMedicare Physician & Other Practitioners - by Provider (CMS) (opens in a new tab) |
| Part D prescribing | Medicare Part D Prescribers - by Provider and Drug (CMS) (opens in a new tab) |
| MIPS scores, telehealth, assignment and procedure percentiles | Doctors and Clinicians National Downloadable File (CMS) (opens in a new tab) |
| Industry payments | Open Payments (CMS) (opens in a new tab) |
| Training, board certification and memberships | Dmand AI Professional Profile Data |
| EHR at each practice site | Dmand AI Technology Install Data |
| Similar physicians | Dmand AI Affiliation Data |
Data last refreshed October 2026Report an inaccuracyRemove my information
FAQ
Frequently asked questions about Dr. Willem J. Van Der Werf
Spotted something out of date? Email hello@dmand.ai and we will check the record. Contact details live in the free trial.
What is Dr. Willem J. Van Der Werf's NPI number?
Dr. Willem J. Van Der Werf's NPI number is 1275563397. It was assigned on July 4, 2006, and it is active in the NPI Registry.
What kind of doctor is Dr. Willem J. Van Der Werf?
Dr. Willem J. Van Der Werf is a transplant surgery physician in Phoenix, Arizona. The primary specialty in the NPI Registry is Transplant Surgery Physician (taxonomy code 204F00000X).
Where does Dr. Willem J. Van Der Werf practice?
Dr. Van Der Werf practices at 350 West Thomas Road, Phoenix, AZ 85013. Dr. Van Der Werf's primary practice is Dignity Health St. Joseph's Hospital and Medical Center in Phoenix, Arizona, part of CommonSpirit Health. Dmand AI also links Dr. Van Der Werf to 2 group practices and clinics and 1 medical group.
What is Dr. Willem J. Van Der Werf's office phone number?
The practice phone on file for Dr. Van Der Werf is (602) 406-8225.
What is Dr. Willem J. Van Der Werf's medical license number?
Dr. Van Der Werf holds Arizona license 49927, one of the licenses on file in 2 states.
Which states has Dr. Willem J. Van Der Werf been licensed in?
Dmand AI has state licenses on file for Dr. Van Der Werf in Arizona and Utah.
Which hospitals is Dr. Willem J. Van Der Werf affiliated with?
Dr. Van Der Werf practices at Dignity Health St. Joseph's Hospital and Medical Center in Phoenix, Arizona. Dr. Van Der Werf is also affiliated with Banner - University Medical Center Phoenix.
What medical group is Dr. Willem J. Van Der Werf part of?
Dr. Van Der Werf is linked to Arizona Transplant Associates. Dmand AI links Dr. Van Der Werf to 1 more medical group.
Does Dr. Willem J. Van Der Werf accept Medicare?
Yes. CMS data shows Dr. Van Der Werf billed Medicare for 41 services in 2024, and Dr. Van Der Werf accepts Medicare assignment.
How many Medicare patients does Dr. Willem J. Van Der Werf see?
CMS counts 61 Medicare patients who saw Dr. Van Der Werf in 2024, with an average age of 67.
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What services does Dr. Willem J. Van Der Werf bill to Medicare?
In 2024, Dr. Van Der Werf's most billed Medicare services were hospital inpatient care (99232).
Where did Dr. Willem J. Van Der Werf go to medical school?
Dr. Van Der Werf graduated from University of California, San Francisco School of Medicine in 1988.
What drugs does Dr. Willem J. Van Der Werf prescribe most?
In 2018 Medicare Part D data, Dr. Van Der Werf's most prescribed drugs by claims were Ursodiol.
Has Dr. Willem J. Van Der Werf received payments from drug or device companies?
CMS Open Payments shows $6,546 in general payments to Dr. Van Der Werf from 3 companies from 2020 to 2025. The largest total came from Intuitive Surgical, Inc.
How long has Dr. Willem J. Van Der Werf been practicing?
Dr. Van Der Werf graduated from medical school in 1988, 38 years ago.
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