Type 1 · Individual ✓ Active NPI ✓ Valid NPI checksum
Joseph Zisk, CPO
Orthotist in Chicago, IL · enumerated 2024.
Data current as of Jul 13, 2026 · sourced from CMS NPPES
National Provider Identifier
1770325508
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Registry record
Entity type Individual (Type 1)
Name Joseph Zisk
Credential CPO
Sex Male
Practice address 2418 W Cortland St Apt 3, Chicago, IL, 60647
Phone (434) 806-9903
Enumeration date Jun 11, 2024
Last updated in NPPES Jun 11, 2024
Taxonomy & licenses
224P00000X Prosthetist Respiratory, Developmental, Rehabilitative and Restorative Service Providers Secondary
222Z00000X Orthotist Respiratory, Developmental, Rehabilitative and Restorative Service Providers Primary
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
How do I verify Joseph Zisk's NPI record?
Cross-check NPI 1770325508 against the official CMS registry at npiregistry.cms.hhs.gov. This page mirrors the same public NPPES data with a monthly snapshot.
Is NPI 1770325508 active?
Yes, as of the latest NPPES snapshot, NPI 1770325508 is active (record last updated 2024-06-11).
Source: CMS NPPES (public data). Snapshot 2026-07-13. Provider record last updated 2024-06-11.