What is Gregory Sierminski's NPI number?

Gregory Sierminski's National Provider Identifier (NPI) is 1255386801, a unique 10-digit ID issued by CMS for use in standard healthcare transactions.

What is Gregory Sierminski's specialty?

Gregory Sierminski is listed in the NPPES registry with a primary specialty of Dentist (Dental Providers).

Where is Gregory Sierminski located?

Gregory Sierminski's practice location on file with NPPES is 7442 Hancock Dr, Wonder Lake, IL 60097.

What is Gregory Sierminski's phone number?

The practice phone number listed in the NPPES registry for Gregory Sierminski is (815) 728-0100.

Is Gregory Sierminski's NPI active?

Yes — Gregory Sierminski's NPI (1255386801) is active in the NPPES registry as of the last update on 2007-07-08.

IndividualActive

Gregory Sierminski, DDS

NPI 1255386801 · Dentist · Wonder Lake, IL

Gregory Sierminski, DDS is a Dentist provider in Wonder Lake, IL (NPI 1255386801).

Provider details

NPI number: 1255386801
Entity type: Individual
Primary specialty: DentistDental Providers
Credential: DDS
Sex: Male
License: 19015910 (IL)

Specialties & taxonomies

DentistPrimary122300000XLicense 19015910 (IL)
Dental Providers

Profile Score

Detailed profile(91/100 index)

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

Registry tenure38% of score
20 yrs in NPPES registry
Profile completeness38% of score
100% 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

7442 Hancock Dr

Wonder Lake, IL 60097

Phone: (815) 728-0100

Fax: (815) 728-0114

Street-level locationGet directions

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Mailing address