Type 1 · Individual ✓ Active NPI ✓ Valid NPI checksum
Dr. Ralph Simon Baker, O.D.
Optometrist in Roseville, CA · enumerated 2006.
Data current as of Jul 13, 2026 · sourced from CMS NPPES
National Provider Identifier
1861430043
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Registry record
Entity type Individual (Type 1)
Name Dr. Ralph Simon Baker
Credential O.D.
Sex Male
Practice address 9221 Sierra College Blvd Ste 130, Roseville, CA, 95661
Phone (916) 797-6747
Fax (916) 797-6728
Enumeration date Jun 2, 2006
Last updated in NPPES Nov 7, 2023
Taxonomy & licenses
OD · Doctor of Optometry: A licensed optometrist providing primary vision care, eye exams, and corrective lenses.
About the OD credential
Other identifiers
| Identifier | Type | State | Issuer |
|---|---|---|---|
| SD0086620 | Medicaid | CA | - |
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
Is NPI 1861430043 active?
Yes, as of the latest NPPES snapshot, NPI 1861430043 is active (record last updated 2023-11-07).
How do I verify Ralph Baker's NPI record?
Cross-check NPI 1861430043 against the official CMS registry at npiregistry.cms.hhs.gov. This page mirrors the same public NPPES data with a monthly snapshot.
Other providers at this practice address
Browse all →Source: CMS NPPES (public data). Snapshot 2026-07-13. Provider record last updated 2023-11-07.