Type 1 · Individual ✓ Active NPI ✓ Valid NPI checksum

Dr. Charlotte Florence Nielsen, O.D.

Optometrist in Grayslake, IL · enumerated 2005 · practices at Dr. Charlotte F. Nielsen, P.C..

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

National Provider Identifier

1962492975

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Registry record

Entity type Individual (Type 1)

Name Dr. Charlotte Florence Nielsen

Credential O.D.

Sex Female

Practice address 1120 E Washington St, Grayslake, IL, 60030

Phone (847) 223-2000

Fax (847) 223-9400

Enumeration date Oct 21, 2005

Last updated in NPPES Jun 13, 2008

Taxonomy & licenses

152W00000X Optometrist Eye and Vision Services Providers · License 046008590 (IL) 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
046008590	Medicaid	IL	-
1033303169	Other	IL	CORPORATE NPI

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

Where does Charlotte Nielsen practice?

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

What is the NPI number for Charlotte Nielsen?

The National Provider Identifier (NPI) for Charlotte Nielsen is 1962492975, a Type 1 (individual) record in the CMS NPPES registry.

Other providers at this practice address

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Dr. Charlotte F. Nielsen, P.C. Optometrist · Grayslake, IL NPI 1033303169

Source: CMS NPPES (public data). Snapshot 2026-07-13. Provider record last updated 2008-06-13.