Type 1 · Individual ✓ Active NPI ✓ Valid NPI checksum
Dr. John J. Mcdiarmid, OD
Optometrist in Murrieta, CA · enumerated 2006.
Data current as of Jul 13, 2026 · sourced from CMS NPPES
National Provider Identifier
1427038959
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Registry record
Entity type Individual (Type 1)
Name Dr. John J. Mcdiarmid
Credential OD
Sex Male
Practice address 25395 Hancock Ave, Suite 100, Murrieta, CA, 92562
Phone (951) 696-5388
Fax (951) 696-5391
Enumeration date Jan 19, 2006
Last updated in NPPES Dec 9, 2010
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 |
|---|---|---|---|
| SD0094670 | 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 this the official NPI registry?
No. NPI Portal is a private site built on public CMS NPPES data. The official registry is npiregistry.cms.hhs.gov, operated by CMS.
What specialty is John Mcdiarmid?
John Mcdiarmid is registered in NPPES with the primary taxonomy of Optometrist. The taxonomy code describes the provider's classification and area of specialization for claims and credentialing.
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Source: CMS NPPES (public data). Snapshot 2026-07-13. Provider record last updated 2010-12-09.