IndividualActive
William Grzelak, D.D.S
NPI 1700952561 · General Practice Dentistry · Rockford, IL
William Grzelak, D.D.S is a General Practice Dentistry provider in Rockford, IL (NPI 1700952561).
Provider details
- NPI number
- 1700952561
- Entity type
- Individual
- Primary specialty
- General Practice DentistryDental Providers
- Credential
- D.D.S
- Sex
- Male
- Sole proprietor
- Yes
Specialties & taxonomies
Dental 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
1410 Auburn St
Rockford, IL 61103-4679
Phone: (815) 968-2008
Street-level locationGet directions
Mailing address
6698 Mindy
Rockford, IL 61107
Registry dates
- Enumerated
- 2006-11-25
- Last updated
- 2007-07-08
Frequently asked questions
- What is William Grzelak's NPI number?
- William Grzelak's National Provider Identifier (NPI) is 1700952561, a unique 10-digit ID issued by CMS for use in standard healthcare transactions.
- What is William Grzelak's specialty?
- William Grzelak is listed in the NPPES registry with a primary specialty of General Practice Dentistry (Dental Providers).
- Where is William Grzelak located?
- William Grzelak's practice location on file with NPPES is 1410 Auburn St, Rockford, IL 61103-4679.
- What is William Grzelak's phone number?
- The practice phone number listed in the NPPES registry for William Grzelak is (815) 968-2008.
- Is William Grzelak's NPI active?
- Yes — William Grzelak's NPI (1700952561) is active in the NPPES registry as of the last update on 2007-07-08.
Source: CMS NPPES Data Dissemination (June 2026). NPI Central is not affiliated with CMS. Data is provided as-is from the public registry.