Quick answers
- Where does Joanne D. Du see patients?
- Medicare's clinician data lists 2 practice locations, including Cupertino, CA and Freedom, CA. Call before your visit to confirm the address.
- What is Joanne D. Du's specialty?
- Medicare lists Optometry as the primary specialty.
- Does Joanne D. Du accept Medicare assignment?
- Yes. Medicare's clinician data says Joanne D. Du accepts Medicare assignment (the Medicare-approved amount as full payment for covered services), as of 2026-10-02. Ask the office to confirm before your visit.
- What is the phone number for Joanne D. Du?
- (408) 253-3083, as listed in official Medicare / NPI Registry data.
- What is Joanne D. Du's NPI number?
- 1649852120. The NPI (National Provider Identifier) is the clinician's permanent federal ID; you can look it up in the official NPI Registry.
Practice locations
Addresses where Joanne D. Du is enrolled with Medicare (CMS data updated 2026-10-02).
- 10300 S De Anza Blvd, Suite ACupertino, CA 95014 (408) 253‑3083
- 160 Green Valley Rd, Suite 202Freedom, CA 95019 (831) 728‑2020
Group practices
Medicare enrollment lists Joanne D. Du as a member of this group (CMS data updated 2026-10-02).
- Spectrum Eye Physicians a Medical Corporation15 clinicians in the group
Specialties
- Optometryprimary
Other optometrists in Cupertino
Clinicians with the same Medicare primary specialty in Cupertino, CA — not a recommendation.
Clinician information
| Credential | OD |
|---|---|
| Medical school | Southern California College Of Optometry |
| Graduation year | 2021 |
| Gender (as listed) | Female |
| Medicare assignment | Accepts (Medicare-approved amount as full payment) |
| NPI (National Provider Identifier) | 1649852120 |
| Corrections | Report an error or suggest an update → |
Most corrections must be made at the source: clinicians update their NPI Registry record (NPPES) and their Medicare enrollment (PECOS); this page follows the next data release.
Sources
- National Downloadable File (Doctors and Clinicians) — CMS, data updated 2026-10-02, retrieved 2026-10-29
- NPI Registry — U.S. Department of Health and Human Services (NPPES), the clinician’s official record
- Medicare Care Compare — official Medicare tool to look up clinicians