Type 1 · Individual ✓ Active NPI ✓ Valid NPI checksum Sole proprietor

Dr. Sandra Marie Landwehr, OD

Optometrist in Green Bay, WI · enumerated 2006.

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

National Provider Identifier

1770544603

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Registry record

Entity type Individual (Type 1)

Name Dr. Sandra Marie Landwehr

Credential OD

Sex Female

Practice address Green Bay, WI, 54307

Phone (920) 494-2121

Fax (920) 221-0117

Enumeration date Mar 30, 2006

Last updated in NPPES Sep 9, 2024

Street address withheld: NPPES sole-proprietor addresses can be home addresses. See our data policy.

Taxonomy & licenses

152W00000X Optometrist Eye and Vision Services Providers · License 2188 (WI) Primary

OD · Doctor of Optometry: A licensed optometrist providing primary vision care, eye exams, and corrective lenses. About the OD credential

Other identifiers

Identifier	Type	State	Issuer
38531700	Medicaid	WI	-
1770544603	Medicaid	WI	-

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 Sandra Landwehr practice?

The practice location on file with NPPES is in Green Bay, WI. Providers can have multiple locations; NPPES lists the primary practice address.

What is the NPI number for Sandra Landwehr?

The National Provider Identifier (NPI) for Sandra Landwehr is 1770544603, a Type 1 (individual) record in the CMS NPPES registry.

Source: CMS NPPES (public data). Snapshot 2026-07-13. Provider record last updated 2024-09-09.