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Willem J Van Der Werf, M.D.

Transplant Surgery Physician in Phoenix, AZ · enumerated 2006 · practices at Arizona Transplant Associates, PC.

Data current as of Jul 13, 2026 · sourced from CMS NPPES

National Provider Identifier

1275563397

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Registry record

Entity type Individual (Type 1)
Name Willem J Van Der Werf
Credential M.D.
Sex Male
Practice address 2218 N 3rd St, Phoenix, AZ, 85004
Phone (602) 252-2543
Fax (602) 252-3861
Enumeration date Jul 4, 2006
Last updated in NPPES Nov 12, 2024

Taxonomy & licenses

174400000X Specialist Other Service Providers · License 5249271205 (UT) Secondary
204F00000X Transplant Surgery Physician Allopathic & Osteopathic Physicians · License 49927 (AZ) Primary
MD · Doctor of Medicine: A physician who completed medical school (allopathic medicine), residency training, and state licensure. About the MD credential

Other identifiers

Identifier Type State Issuer
119626000 Medicaid WY -
QM000006442 Other - ALTIUS
4658850 Other - CIGNA
52492781200001 Other - BLUE CROSS BLUE SHIELD
806894300 Medicaid ID -
TPRA07781 Other - MOLINA

What is an NPI number?

A National Provider Identifier (NPI) is a unique 10-digit number that CMS assigns to every U.S. healthcare provider and organization under HIPAA. Type 1 NPIs identify individual providers; Type 2 NPIs identify organizations. The NPI appears on insurance claims, prescriptions, and credentialing paperwork, and never changes, even if the provider moves or changes specialty.

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Frequently asked questions

Is NPI 1275563397 active?
Yes, as of the latest NPPES snapshot, NPI 1275563397 is active (record last updated 2024-11-12).
How do I verify Willem Van Der Werf's NPI record?
Cross-check NPI 1275563397 against the official CMS registry at npiregistry.cms.hhs.gov. This page mirrors the same public NPPES data with a monthly snapshot.

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Source: CMS NPPES (public data). Snapshot 2026-07-13. Provider record last updated 2024-11-12.