Yen Hsia, MD
NPI 1326468661 · Ophthalmology Physician · Walnut Creek, CA
Enrolled with Medicare as Practitioner - Ophthalmology · source: CMS PECOS Public Provider Enrollment (2026.04.01)
Yen Hsia, MD is a Ophthalmology Physician provider in Walnut Creek, CA (NPI 1326468661).
Provider details
- NPI number
- 1326468661
- Entity type
- Individual
- Primary specialty
- Ophthalmology PhysicianAllopathic & Osteopathic Physicians
- Credential
- MD
- Sex
- Male
- Sole proprietor
- No
- License
- A133168 (CA)
Specialties & taxonomies
Allopathic & Osteopathic Physicians
Profile Score
A profile completeness & documented-activity index — NOT a quality, outcomes, or patient-satisfaction rating.
- Registry tenure25% of score
12 yrs in NPPES registry
- Profile completeness25% of score
100% of core fields populated
- Practice footprint15% of score
1 documented practice location
- Medicare service volume (vs. specialty peers)25% of score
4,960 Medicare services, 2024 (ranked within specialty)
- Open Payments transparency10% of score
Has Open Payments disclosures (2024)
Medicare volume is ranked against active providers in the same specialty. 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 .
What this provider does (Medicare)
Based on Medicare fee-for-service claims, 2024; not all care is captured.
| Service (HCPCS) | Medicare services | Typical Medicare-allowed (2024) |
|---|---|---|
| Established Patient Problem Focused Exam of Visual System92012 | 825 | $113 |
| Visit Complexity Inherent to Evaluation and Management Associated With Medical Care Services That Serve As the Continuing Focal Point for All Needed Health Care Services And/Or With Medical Care Services That Are Part of Ongoing Care Related to a Patient'SG2211 | 542 | $19 |
| Established Patient Office Or Other Outpatient Visit With Low Level OD Decision Making, If Using Time, 20 Minutes Or More99213 | 537 | $109 |
| Established Patient Complete Exam of Visual System92014 | 529 | $158 |
| Exam of Visual Field With Extended Testing92083 | 479 | $82 |
| Imaging of Optic Nerve92133 |
What this provider prescribes (Medicare Part D)
Top drugs by Medicare Part D claim volume, 2024 · 37 distinct drugs on file.
| Drug | Part D claims (2024) | Beneficiaries |
|---|---|---|
| Latanoprost | 624 | 203 |
| Dorzolamide Hcl/Timolol Maleatbrand: Dorzolamide-Timolol | 385 | 124 |
| Timolol Maleate | 299 | 112 |
| Prednisolone Acetate | 279 | 201 |
| Brimonidine Tartrate | 238 | 74 |
| Moxifloxacin Hclbrand: Moxifloxacin | 211 | 161 |
| Ketorolac Tromethamine | 192 | 141 |
Transparency — industry payments
Based on CMS Open Payments, 2024; not all care is captured.
$1,350 across 26 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
- 2014-04-25
- Last updated
- 2026-01-14
- Certified
- 2026-01-14
Frequently asked questions
- What is Yen Hsia's NPI number?
- Yen Hsia's National Provider Identifier (NPI) is 1326468661, a unique 10-digit ID issued by CMS for use in standard healthcare transactions.
- What is Yen Hsia's specialty?
- Yen Hsia is listed in the NPPES registry with a primary specialty of Ophthalmology Physician (Allopathic & Osteopathic Physicians).
- Where is Yen Hsia located?
- Yen Hsia's practice location on file with NPPES is 350 N Wiget Ln Ste 200, Walnut Creek, CA 94598-2448.
- What is Yen Hsia's phone number?
- The practice phone number listed in the NPPES registry for Yen Hsia is (925) 934-7800.
- Does Yen Hsia accept Medicare?
- Yen Hsia is approved to bill Medicare according to CMS PECOS enrollment data (2026.04.01). Confirm current participation with the provider before scheduling.
- Is Yen Hsia's NPI active?
- Yes — Yen Hsia's NPI (1326468661) is active in the NPPES registry as of the last update on 2026-01-14.
Source: CMS NPPES Data Dissemination (June 2026). NPI Central is not affiliated with CMS. Data is provided as-is from the public registry.