Type 1 · Individual ✓ Active NPI ✓ Valid NPI checksum

Ms. Marilynn S Vander Schaaf, PT

Physical Therapist in Towson, MD · enumerated 2006.

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

National Provider Identifier

1649338427

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Registry record

Entity type Individual (Type 1)

Name Ms. Marilynn S Vander Schaaf

Credential PT

Sex Female

Practice address 1026 Cromwell Bridge Rd, Towson, MD, 21286

Phone (410) 583-1515

Fax (410) 583-2491

Enumeration date Dec 5, 2006

Last updated in NPPES Jul 8, 2007

Taxonomy & licenses

225100000X Physical Therapist Respiratory, Developmental, Rehabilitative and Restorative Service Providers · License 14198 (MD) Primary

PT · Physical Therapist: A licensed movement specialist treating injury and disability through exercise and rehabilitation. About the PT 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 1649338427 active?

Yes, as of the latest NPPES snapshot, NPI 1649338427 is active (record last updated 2007-07-08).

How do I verify Marilynn Vander Schaaf's NPI record?

Cross-check NPI 1649338427 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 2007-07-08.