OrganizationActive
Gregory V. Sierminski, D.D.S., P.C.
NPI 1720259013 · Dentist · Crystal Lake, IL
Provider details
- NPI number
- 1720259013
- Entity type
- Organization
- Primary specialty
- DentistDental Providers
- Organization subpart
- No
- Authorized official
- Gregory Sierminski, Dentist(815) 728-0100
Specialties & taxonomies
Dental Providers
Profile Score
Detailed profile(87/100 index)
A profile completeness & documented-activity index — NOT a quality, outcomes, or patient-satisfaction rating.
- Registry tenure38% of score
18 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 Drive
Crystal Lake, IL 60097
Phone: (815) 728-0100
Fax: (815) 728-0114
Street-level locationGet directions
Mailing address
P.o. Box 388
Wonder Lake, IL 60097
Registry dates
- Enumerated
- 2008-03-14
- Last updated
- 2008-03-14
Source: CMS NPPES Data Dissemination (June 2026). NPI Central is not affiliated with CMS. Data is provided as-is from the public registry.