Type 1 · Individual ✓ Active NPI ✓ Valid NPI checksum
Brooke Ashton Castillo, OD
Optometrist in Fremont, MI · enumerated 2026.
Data current as of Jul 13, 2026 · sourced from CMS NPPES
National Provider Identifier
1881539666
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Registry record
Entity type Individual (Type 1)
Name Brooke Ashton Castillo
Credential OD
Sex Female
Practice address 1231 W Main St, Fremont, MI, 49412
Phone (231) 924-2700
Enumeration date Apr 20, 2026
Last updated in NPPES Jun 16, 2026
Taxonomy & licenses
OD · Doctor of Optometry: A licensed optometrist providing primary vision care, eye exams, and corrective lenses.
About the OD 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
What is the NPI number for Brooke Castillo?
The National Provider Identifier (NPI) for Brooke Castillo is 1881539666, a Type 1 (individual) record in the CMS NPPES registry.
Where does Brooke Castillo practice?
The practice location on file with NPPES is in Fremont, MI. Providers can have multiple locations; NPPES lists the primary practice address.
Other providers at this practice address
Browse all → Robert Hardy Optometrist · Fremont, MI NPI 1174518617 E.C. One, Pllc Optometrist · Fremont, MI NPI 1639137508 Rebecca Payne Optometrist · Fremont, MI NPI 1184676017 Michele Klukos Physical Therapist · Fremont, MI NPI 1952407298 Physiotherapy Associates Inc Physical Therapy Clinic/Center · Fremont, MI NPI 1366549800
Source: CMS NPPES (public data). Snapshot 2026-07-13. Provider record last updated 2026-06-16.