Type 1 · Individual ✓ Active NPI ✓ Valid NPI checksum
Craig W. Irwin, M.D.
Internal Medicine Physician in Lexington, KY · enumerated 2006.
Data current as of Jul 13, 2026 · sourced from CMS NPPES
National Provider Identifier
1922024124
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Registry record
Taxonomy & licenses
Other identifiers
| Identifier | Type | State | Issuer |
|---|---|---|---|
| 400501 | Other | KY | MEDICARE LAB GRP |
| 64026065 | Medicaid | KY | - |
| 37903705 | Other | KY | MEDICAID LAB GRP |
| CB5773 | Other | GA | RR MEDICARE GRP |
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 2007-11-02.