Type 2 · Organization ✓ Active NPI ✓ Valid NPI checksum
Carl J Carlson MD
Cardiovascular Disease Physician in Fremont, CA · enumerated 2007 · authorized official Catherine Carlson, Office Manager.
Data current as of Jul 13, 2026 · sourced from CMS NPPES
National Provider Identifier
1508075540
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Registry record
Taxonomy & classification
Authorized official
Other identifiers
| Identifier | Type | State | Issuer |
|---|---|---|---|
| ZZZ26021Z | Other | CA | BLUECROSS AND BLUESHIELD |
| 00G292950 | Medicaid | CA | - |
| 000169 | Other | CA | HILL PHYSICIANS |
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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Providers at this address
Browse all →Source: CMS NPPES (public data). Snapshot 2026-07-13. Provider record last updated 2009-06-22.