Type 1 · Individual ✓ Active NPI ✓ Valid NPI checksum Sole proprietor
Mark Lyon, MD
Urology Physician in Evergreen Park, IL · enumerated 2007.
Data current as of Jul 13, 2026 · sourced from CMS NPPES
National Provider Identifier
1831300748
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Registry record
Street address withheld: NPPES sole-proprietor addresses can be home addresses. See our data policy.
Taxonomy & licenses
Other identifiers
| Identifier | Type | State | Issuer |
|---|---|---|---|
| P00467991 | Other | - | MEDICARE RAILROAD PTAN |
| 02232706 | Other | - | BCBS |
| DG0826 | Other | - | MEDICARE RAILROAD GROUP NUMBER |
| 211475 | Other | - | MEDICAN PTAN |
| 036116228 | Medicaid | IL | - |
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
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Other providers at this practice address
Browse all →Source: CMS NPPES (public data). Snapshot 2026-07-13. Provider record last updated 2025-04-16.