Type 1 · Individual ✓ Active NPI ✓ Valid NPI checksum

Margaret A Hewitt, MD

Dermatology Physician in Lake Oswego, OR · enumerated 2006.

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

National Provider Identifier

1063521219

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Registry record

Entity type Individual (Type 1)

Name Margaret A Hewitt

Credential MD

Sex Female

Practice address 4035 Sw Mercantile Dr, #210, Lake Oswego, OR, 97035

Phone (503) 636-6114

Fax (503) 636-4896

Enumeration date Aug 30, 2006

Last updated in NPPES Apr 8, 2008

Taxonomy & licenses

207N00000X Dermatology Physician Allopathic & Osteopathic Physicians · License MD12549 (OR) Primary

MD · Doctor of Medicine: A physician who completed medical school (allopathic medicine), residency training, and state licensure. About the MD 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

Where does Margaret Hewitt practice?

The practice location on file with NPPES is in Lake Oswego, OR. Providers can have multiple locations; NPPES lists the primary practice address.

What is the NPI number for Margaret Hewitt?

The National Provider Identifier (NPI) for Margaret Hewitt is 1063521219, a Type 1 (individual) record in the CMS NPPES registry.

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Stephen Weil Internal Medicine Physician · Lake Oswego, OR NPI 1447201215

Source: CMS NPPES (public data). Snapshot 2026-07-13. Provider record last updated 2008-04-08.