Type 1 · Individual ✓ Active NPI ✓ Valid NPI checksum
Fernando Diaz, MD
Specialist in Royal Oak, MI · enumerated 2005.
Data current as of Jul 13, 2026 · sourced from CMS NPPES
National Provider Identifier
1184610875
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Registry record
Entity type Individual (Type 1)
Name Fernando Diaz
Credential MD
Sex Male
Practice address 3555 W 13 Mile Rd Ste N220, Royal Oak, MI, 48073
Phone (248) 784-3667
Fax (248) 869-3982
Enumeration date Sep 27, 2005
Last updated in NPPES Mar 27, 2025
Taxonomy & licenses
207T00000X Neurological Surgery Physician Allopathic & Osteopathic Physicians · License 4301040395 (MI) Secondary
MD · Doctor of Medicine: A physician who completed medical school (allopathic medicine), residency training, and state licensure.
About the MD credential
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 Fernando Diaz?
Fernando Diaz is registered in NPPES with the primary taxonomy of Specialist. The taxonomy code describes the provider's classification and area of specialization for claims and credentialing.
Other providers at this practice address
Browse all → Holly Gilmer Neurological Surgery Physician · Royal Oak, MI NPI 1881638930 Jeffrey Jacob Neurological Surgery Physician · Royal Oak, MI NPI 1073715686 Ali Luqman Neurological Surgery Physician · Royal Oak, MI NPI 1386877736 Olga Klahm Physician Assistant · Royal Oak, MI NPI 1033441548 Ratnesh Mehra Neurological Surgery Physician · Royal Oak, MI NPI 1609138841 Ishan Singhal Neurological Surgery Physician · Royal Oak, MI NPI 1285328930
Source: CMS NPPES (public data). Snapshot 2026-07-13. Provider record last updated 2025-03-27.