What is William Prosniewski's NPI number?

William Prosniewski's National Provider Identifier (NPI) is 1205405685, a unique 10-digit ID issued by CMS for use in standard healthcare transactions.

What is William Prosniewski's specialty?

William Prosniewski is listed in the NPPES registry with a primary specialty of General Practice Dentistry (Dental Providers).

Where is William Prosniewski located?

William Prosniewski's practice location on file with NPPES is 116 W Bartlett Ave, Bartlett, IL 60103-4282.

What is William Prosniewski's phone number?

The practice phone number listed in the NPPES registry for William Prosniewski is (630) 837-2779.

Is William Prosniewski's NPI active?

Yes — William Prosniewski's NPI (1205405685) is active in the NPPES registry as of the last update on 2021-06-21.

IndividualActive

William Prosniewski, DMD

NPI 1205405685 · General Practice Dentistry · Bartlett, IL

William Prosniewski, DMD is a General Practice Dentistry provider in Bartlett, IL (NPI 1205405685).

Provider details

NPI number: 1205405685
Entity type: Individual
Primary specialty: General Practice DentistryDental Providers
Credential: DMD
Sex: Male
Sole proprietor: Yes
License: 019033158 (IL)

Practice location

116 W Bartlett Ave

Bartlett, IL 60103-4282

Phone: (630) 837-2779

Street-level locationGet directions

More IL providers

Mailing address

989 La Costa Ave

Bartlett, IL 60103-6609

Specialties & taxonomies

General Practice DentistryPrimary1223G0001XLicense 019033158 (IL)
Dental Providers

Profile Score

Established profile(68/100 index)

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

Registry tenure33% of score
5 yrs in NPPES registry
Profile completeness33% of score
100% of core fields populated
Practice footprint20% of score
1 documented practice location
Open Payments transparency13% of score
Has Open Payments disclosures (2024)

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.

What this provider prescribes (Medicare Part D)

Top drugs by Medicare Part D claim volume, 2024 · 1 distinct drug on file.

Drug	Part D claims (2024)	Beneficiaries
Amoxicillin	14	12

Medicare Part D only. These counts cover prescriptions paid through Medicare Part D in 2024 — they do not include cash-pay, commercial-insurance, Medicaid, or Part B–administered drugs, and badly undercount high cash-pay categories (e.g. GLP-1 weight-loss, testosterone, and ED medications). Any drug with 10 or fewer claims is omitted by CMS, and beneficiary counts under 11 are suppressed — so a missing drug means no Part D record, never zero. This is a factual claims summary, not an endorsement, not medical advice, and not a consumer report. Source: CMS Medicare Part D Prescribers — by Provider and Drug.

Transparency — industry payments

Based on CMS Open Payments, 2024; not all care is captured.

$13 across 1 record (Open Payments 2024)

Open Payments discloses payments and transfers of value (meals, travel, consulting, research, royalties) from drug and device makers to providers. This is a transparency signal, not a verdict — such payments are legal and common, and their presence is neither an endorsement nor a criticism. Source: CMS Open Payments, program year 2024.

Enumerated: 2021-06-21
Last updated: 2021-06-21
Certified: 2021-06-21

Frequently asked questions

What is William Prosniewski's NPI number?: William Prosniewski's National Provider Identifier (NPI) is 1205405685, a unique 10-digit ID issued by CMS for use in standard healthcare transactions.
What is William Prosniewski's specialty?: William Prosniewski is listed in the NPPES registry with a primary specialty of General Practice Dentistry (Dental Providers).
Where is William Prosniewski located?: William Prosniewski's practice location on file with NPPES is 116 W Bartlett Ave, Bartlett, IL 60103-4282.
What is William Prosniewski's phone number?: The practice phone number listed in the NPPES registry for William Prosniewski is (630) 837-2779.
Is William Prosniewski's NPI active?: Yes — William Prosniewski's NPI (1205405685) is active in the NPPES registry as of the last update on 2021-06-21.

Source: CMS NPPES Data Dissemination (June 2026). NPI Central is not affiliated with CMS. Data is provided as-is from the public registry.

Provider details

Practice location

Mailing address

Specialties & taxonomies

Profile Score

What this provider prescribes (Medicare Part D)

Transparency — industry payments

Registry dates

Frequently asked questions

Specialties & taxonomies

Profile Score

What this provider prescribes (Medicare Part D)

Transparency — industry payments

Frequently asked questions