Type 1 · Individual ✓ Active NPI ✓ Valid NPI checksum
Dr. Marvin Zelkowitz, M.D.
Specialist in Flossmoor, IL · enumerated 2005.
Data current as of Jul 13, 2026 · sourced from CMS NPPES
National Provider Identifier
1730189259
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Registry record
Entity type Individual (Type 1)
Name Dr. Marvin Zelkowitz
Credential M.D.
Sex Male
Practice address 3235 Vollmer Rd, Suite 110, Flossmoor, IL, 60422
Phone (708) 957-3737
Fax (708) 957-2516
Enumeration date Jul 27, 2005
Last updated in NPPES Jul 8, 2007
Taxonomy & licenses
MD · Doctor of Medicine: A physician who completed medical school (allopathic medicine), residency training, and state licensure.
About the MD credential
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
Is NPI 1730189259 active?
Yes, as of the latest NPPES snapshot, NPI 1730189259 is active (record last updated 2007-07-08).
How do I verify Marvin Zelkowitz's NPI record?
Cross-check NPI 1730189259 against the official CMS registry at npiregistry.cms.hhs.gov. This page mirrors the same public NPPES data with a monthly snapshot.
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.