Type 1 · Individual ✓ Active NPI ✓ Valid NPI checksum
Dr. Michael Rosner, OD
Optometrist in Walnut Creek, CA · enumerated 2018.
Data current as of Jul 13, 2026 · sourced from CMS NPPES
National Provider Identifier
1669968095
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Registry record
Entity type Individual (Type 1)
Name Dr. Michael Rosner
Credential OD
Sex Male
Practice address 1811 Ygnacio Valley Rd, Walnut Creek, CA, 94598
Phone (925) 933-1344
Enumeration date Jul 9, 2018
Last updated in NPPES Jul 9, 2018
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 Michael Rosner?
Michael Rosner 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 → Wayne Martin Optometrist · Walnut Creek, CA NPI 1689647620 Scott Weinberg Optometrist · Walnut Creek, CA NPI 1063683944 For Your Eyes Only Ophthalmic Medical Corp. Optometrist · Walnut Creek, CA NPI 1386034452 Anna Wu Optometrist · Walnut Creek, CA NPI 1356964720 Through the Hayes Optometry Inc Optometrist · Walnut Creek, CA NPI 1871484485
Source: CMS NPPES (public data). Snapshot 2026-07-13. Provider record last updated 2018-07-09.