Robert J Lock, MD
Robert J Lock is a Cardiovascular Disease Physician provider (Internal Medicine) practicing in Eureka, CA, registered in the NPPES registry with NPI 1821079393 since 2005. The credential MD stands for Doctor of Medicine.
✓ Active NPI ✓ Valid NPI checksum
| NPI | 1821079393 |
|---|---|
| Entity type | Individual (Type 1) |
| Name | Robert J Lock |
| Credential | MD |
| Sex | Male |
| Practice address | 2535 HARRISON AVENUE, Eureka, CA, 95501 |
| Phone | 7072688718 |
| Fax | 7072688008 |
| Enumeration date | 2005-11-10 |
| Last updated in NPPES | 2007-07-08 |
Taxonomy & licenses
| Taxonomy code | Specialty | Primary | License | State |
|---|---|---|---|---|
| 207RC0000X | Cardiovascular Disease Physician | Primary | G51176 | CA |
MD — Doctor of Medicine: A physician who completed medical school (allopathic medicine), residency training, and state licensure. About the MD credential
Other identifiers
| Identifier | Type | State | Issuer |
|---|---|---|---|
| 00G511760 | Medicaid | CA | — |
Copy-ready billing details
Provider: Robert Lock, MD NPI: 1821079393 Taxonomy: 207RC0000X (Cardiovascular Disease Physician) Address: 2535 HARRISON AVENUE, Eureka, CA, 95501
Verify this record
Cross-check NPI 1821079393 against the authoritative CMS record: view Robert J Lock on the official NPPES registry .
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. Read the full guide or validate an NPI number.
Frequently asked questions
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Source: CMS NPPES (public data). Snapshot 2026-07-10. Provider record last updated 2007-07-08.