Type 1 · Individual ✓ Active NPI ✓ Valid NPI checksum
Dr. Josephine Ko, OD
Optometrist in Arlington, MA · enumerated 2020.
Data current as of Jul 13, 2026 · sourced from CMS NPPES
National Provider Identifier
1053934935
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Registry record
Entity type Individual (Type 1)
Name Dr. Josephine Ko
Credential OD
Sex Female
Practice address 60 Massachusetts Ave, Arlington, MA, 02474
Phone (781) 316-0141
Enumeration date May 26, 2020
Last updated in NPPES Dec 23, 2025
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
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 Josephine Ko?
Josephine Ko 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.
Other providers at this practice address
Browse all → The Vision Standard Optometrist · Arlington, MA NPI 1508461575 Northeast Optometry LLC Optometrist · Arlington, MA NPI 1922732684 Vision Standard Inc Optometrist · Arlington, MA NPI 1689378283 Adam Estapa Optician · Arlington, MA NPI 1487419933 Perception Optical LLC Eyewear Supplier · Arlington, MA NPI 1508609041
Source: CMS NPPES (public data). Snapshot 2026-07-13. Provider record last updated 2025-12-23.