Type 1 · Individual ✓ Active NPI ✓ Valid NPI checksum
Mr. John Walter Sielski
Pharmacist in Batavia, NY · enumerated 2006.
Data current as of Jul 13, 2026 · sourced from CMS NPPES
National Provider Identifier
1134133291
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Registry record
Entity type Individual (Type 1)
Name Mr. John Walter Sielski
Sex Male
Practice address 222 Richmond Ave, Batavia, NY, 14020
Phone (585) 297-1100
Enumeration date Jul 27, 2006
Last updated in NPPES Jul 8, 2007
Taxonomy & licenses
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.
Frequently asked questions
Where does John Sielski practice?
The practice location on file with NPPES is in Batavia, NY. Providers can have multiple locations; NPPES lists the primary practice address.
What is the NPI number for John Sielski?
The National Provider Identifier (NPI) for John Sielski is 1134133291, a Type 1 (individual) record in the CMS NPPES registry.
Other providers at this practice address
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Source: CMS NPPES (public data). Snapshot 2026-07-13. Provider record last updated 2007-07-08.