Type 1 · Individual ✓ Active NPI ✓ Valid NPI checksum
Gary Guo, MD
Internal Medicine Physician in Valhalla, NY · enumerated 2006.
Data current as of Jul 13, 2026 · sourced from CMS NPPES
National Provider Identifier
1932129582
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Registry record
Taxonomy & licenses
Other identifiers
| Identifier | Type | State | Issuer |
|---|---|---|---|
| 2589997 | Other | NY | GHI PPO |
| 3431H2 | Other | NY | EMPIRE BCBS |
| 5C5569 | Other | NY | HEALTHNET |
| P3538345 | Other | NY | OXFORD |
| 00000087864 | Other | NY | GHI HMO |
| 4147380 | Other | NY | MVP |
| 1443558 | Other | NY | AETNA HMO |
| 7528769 | Other | NY | AETNA PPO |
| GG4103 | Other | - | ATLANTIS |
| P00227230 | Other | NY | RAILROAD MEDICARE |
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.
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Browse all →Source: CMS NPPES (public data). Snapshot 2026-07-13. Provider record last updated 2008-02-29.