Lydia Hsu, M.D.
NPI 1356554679 · Ophthalmology Physician · Palo Alto, CA
Enrolled with Medicare as Practitioner - Ophthalmology · source: CMS PECOS Public Provider Enrollment (2026.04.01)
Lydia Hsu, M.D. is a Ophthalmology Physician provider in Palo Alto, CA (NPI 1356554679).
Provider details
- NPI number
- 1356554679
- Entity type
- Individual
- Primary specialty
- Ophthalmology PhysicianAllopathic & Osteopathic Physicians
- Credential
- M.D.
- Sex
- Female
- Sole proprietor
- Yes
- License
- A108514 (CA)
Specialties & taxonomies
Allopathic & Osteopathic Physicians
Profile Score
A profile completeness & documented-activity index — NOT a quality, outcomes, or patient-satisfaction rating.
- Registry tenure33% of score
19 yrs in NPPES registry
- Profile completeness33% of score
100% of core fields populated
- Practice footprint20% of score
1 documented practice location
- Open Payments transparency13% of score
Has Open Payments disclosures (2024)
Signals a provider has no public data for (e.g. Medicare claims) are left out of the score entirely — never counted as zero — so providers without that data are not penalized. See the full formula and weights in our methodology.
What this provider prescribes (Medicare Part D)
Top drugs by Medicare Part D claim volume, 2024 · 27 distinct drugs on file.
| Drug | Part D claims (2024) | Beneficiaries |
|---|---|---|
| Latanoprost | 774 | 287 |
| Dorzolamide Hcl/Timolol Maleatbrand: Dorzolamide-Timolol | 521 | 159 |
| Brimonidine Tartrate | 305 | 117 |
| Timolol Maleate | 272 | 92 |
| Prednisolone Acetate | 259 | 136 |
| Polymyxin B Sulf/Trimethoprimbrand: Polymyxin B Sul-Trimethoprim | 112 | 90 |
| Bimatoprost | 106 | 33 |
Transparency — industry payments
Based on CMS Open Payments, 2024; not all care is captured.
$61 across 2 records (Open Payments 2024)
Open Payments discloses payments and transfers of value (meals, travel, consulting, research, royalties) from drug and device makers to providers. This is a transparency signal, not a verdict — such payments are legal and common, and their presence is neither an endorsement nor a criticism. Source: CMS Open Payments, program year 2024.
Practice location
Mailing address
Registry dates
- Enumerated
- 2007-05-07
- Last updated
- 2022-02-11
Frequently asked questions
- What is Lydia Hsu's NPI number?
- Lydia Hsu's National Provider Identifier (NPI) is 1356554679, a unique 10-digit ID issued by CMS for use in standard healthcare transactions.
- What is Lydia Hsu's specialty?
- Lydia Hsu is listed in the NPPES registry with a primary specialty of Ophthalmology Physician (Allopathic & Osteopathic Physicians).
- Where is Lydia Hsu located?
- Lydia Hsu's practice location on file with NPPES is 900 Blake Wilbur Dr, Palo Alto, CA 94304-2201.
- What is Lydia Hsu's phone number?
- The practice phone number listed in the NPPES registry for Lydia Hsu is (650) 725-5743.
- Does Lydia Hsu accept Medicare?
- Lydia Hsu is approved to bill Medicare according to CMS PECOS enrollment data (2026.04.01). Confirm current participation with the provider before scheduling.
- Is Lydia Hsu's NPI active?
- Yes — Lydia Hsu's NPI (1356554679) is active in the NPPES registry as of the last update on 2022-02-11.
Source: CMS NPPES Data Dissemination (June 2026). NPI Central is not affiliated with CMS. Data is provided as-is from the public registry.