Dr. William Prosniewski, DMD
Dr. William Prosniewski is a General Practice Dentistry provider (Dentist) practicing in Bartlett, IL, registered in the NPPES registry with NPI 1205405685 since 2021. The credential DMD stands for Doctor of Medicine in Dentistry.
✓ Active NPI ✓ Valid NPI checksum Sole proprietor
| NPI | 1205405685 |
|---|---|
| Entity type | Individual (Type 1) |
| Name | Dr. William Prosniewski |
| Credential | DMD |
| Sex | Male |
| Practice address | Bartlett, IL, 60103 |
| Phone | 6308372779 |
| Enumeration date | 2021-06-21 |
| Last updated in NPPES | 2021-06-21 |
Street address withheld — NPPES sole-proprietor addresses can be home addresses. See our data policy.
Taxonomy & licenses
| Taxonomy code | Specialty | Primary | License | State |
|---|---|---|---|---|
| 1223G0001X | General Practice Dentistry | Primary | 019033158 | IL |
DMD — Doctor of Medicine in Dentistry: A licensed dentist; DMD and DDS are equivalent dental degrees. About the DMD credential
Copy-ready billing details
Provider: William Prosniewski, DMD NPI: 1205405685 Taxonomy: 1223G0001X (General Practice Dentistry) Address: Bartlett, IL, 60103
Other providers at this practice address
| NPI | Name | Type | Specialty | Location |
|---|---|---|---|---|
| 1760572861 | Mark Prosniewski | Individual | General Practice Dentistry | Bartlett, IL |
Verify this record
Cross-check NPI 1205405685 against the authoritative CMS record: view Dr. William Prosniewski on the official NPPES registry .
What is an NPI number?
A National Provider Identifier (NPI) is a unique 10-digit number that CMS assigns to every U.S. healthcare provider and organization under HIPAA. Type 1 NPIs identify individual providers; Type 2 NPIs identify organizations. The NPI appears on insurance claims, prescriptions, and credentialing paperwork, and never changes — even if the provider moves or changes specialty. Read the full guide or validate an NPI number.
Frequently asked questions
Is NPI 1205405685 active?
How do I verify William Prosniewski's NPI record?
Source: CMS NPPES (public data). Snapshot 2026-07-11. Provider record last updated 2021-06-21.