What is William Ernstein's NPI number?

William Ernstein's National Provider Identifier (NPI) is 1427133420, a unique 10-digit ID issued by CMS for use in standard healthcare transactions.

What is William Ernstein's specialty?

William Ernstein is listed in the NPPES registry with a primary specialty of Optometrist (Eye and Vision Services Providers).

Where is William Ernstein located?

William Ernstein's practice location on file with NPPES is 251 E Northwest Hwy, Palatine, IL 60067-8114.

What is William Ernstein's phone number?

The practice phone number listed in the NPPES registry for William Ernstein is (847) 358-4950.

Is William Ernstein's NPI active?

Yes — William Ernstein's NPI (1427133420) is active in the NPPES registry as of the last update on 2007-07-08.

IndividualActive

William Ernstein, O.D.

NPI 1427133420 · Optometrist · Palatine, IL

William Ernstein, O.D. is a Optometrist provider in Palatine, IL (NPI 1427133420).

Provider details

NPI number: 1427133420
Entity type: Individual
Primary specialty: OptometristEye and Vision Services Providers
Credential: O.D.
Sex: Male
Sole proprietor: No

Specialties & taxonomies

OptometristPrimary152W00000X
Eye and Vision Services Providers

Profile Score

Detailed profile(84/100 index)

A profile completeness & documented-activity index — NOT a quality, outcomes, or patient-satisfaction rating.

Registry tenure38% of score
19 yrs in NPPES registry
Profile completeness38% of score
83% of core fields populated
Practice footprint23% of score
1 documented practice location

Signals a provider has no public data for (e.g. Medicare claims) are left out of the score entirely — never counted as zero — so providers without that data are not penalized. See the full formula and weights in our methodology.

Practice location

251 E Northwest Hwy

Palatine, IL 60067-8114

Phone: (847) 358-4950

Fax: (847) 358-4990

Street-level locationGet directions

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Mailing address