Type 1 · Individual ✓ Active NPI ✓ Valid NPI checksum

Dr. Sonja Van Mastrigt-De Graaff, NMD, PHD

Naturopath in Scottsdale, AZ · enumerated 2007.

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

National Provider Identifier

1679696751

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Registry record

Entity type Individual (Type 1)

Name Dr. Sonja Van Mastrigt-De Graaff

Credential NMD, PHD

Sex Female

Practice address 12320 N 136th Pl, Scottsdale, AZ, 85259

Phone (480) 314-2333

Fax (480) 314-2252

Enumeration date Apr 6, 2007

Last updated in NPPES Jul 8, 2007

Taxonomy & licenses

175F00000X Naturopath Other Service Providers · License 98-536 (AZ) Primary

PHD · Doctor of Philosophy: A doctoral degree; in healthcare often held by clinical psychologists and researchers. About the PHD credential

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.

Read the full guide → Validate an NPI →

Frequently asked questions

Is NPI 1679696751 active?

Yes, as of the latest NPPES snapshot, NPI 1679696751 is active (record last updated 2007-07-08).

How do I verify Sonja Van Mastrigt-De Graaff's NPI record?

Cross-check NPI 1679696751 against the official CMS registry at npiregistry.cms.hhs.gov. This page mirrors the same public NPPES data with a monthly snapshot.

Source: CMS NPPES (public data). Snapshot 2026-07-13. Provider record last updated 2007-07-08.