Rex Hsei, MD
NPI 1285637157 · Ophthalmology Physician · Santa Cruz, CA
Enrolled with Medicare as Practitioner - Ophthalmology · source: CMS PECOS Public Provider Enrollment (2026.04.01)
Rex Hsei, MD is a Ophthalmology Physician provider in Santa Cruz, CA (NPI 1285637157).
Provider details
- NPI number
- 1285637157
- Entity type
- Individual
- Primary specialty
- Ophthalmology PhysicianAllopathic & Osteopathic Physicians
- Credential
- MD
- Sex
- Male
- License
- A71449 (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
21 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
4,103 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 Complete Exam of Visual System92014 | 1,107 | $139 |
| Established Patient Problem Focused Exam of Visual System92012 | 1,003 | $99 |
| Measurement of Corneal Curvature and Depth of Eye92136 | 527 | $27 |
| Removal of Cataract With Insertion of Prosthetic Lens66984 | 334 | $520 |
| New Patient Complete Exam of Visual System92004 | 279 | $164 |
| Exam of Visual Field With Extended Testing92083 | 215 | $71 |
What this provider prescribes (Medicare Part D)
Top drugs by Medicare Part D claim volume, 2024 · 24 distinct drugs on file.
| Drug | Part D claims (2024) | Beneficiaries |
|---|---|---|
| Latanoprost | 708 | 170 |
| Prednisolone Acetate | 268 | 156 |
| Ofloxacin | 237 | 151 |
| Ketorolac Tromethamine | 236 | 146 |
| Brimonidine Tartrate | 127 | 30 |
| Timolol Maleate | 118 | 32 |
| Erythromycin Basebrand: Erythromycin | 89 | 73 |
| Dorzolamide Hcl/Timolol Maleatbrand: Dorzolamide-Timolol |
Transparency — industry payments
Based on CMS Open Payments, 2024; not all care is captured.
$208 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
- 2005-05-24
- Last updated
- 2007-07-08
Frequently asked questions
- What is Rex Hsei's NPI number?
- Rex Hsei's National Provider Identifier (NPI) is 1285637157, a unique 10-digit ID issued by CMS for use in standard healthcare transactions.
- What is Rex Hsei's specialty?
- Rex Hsei is listed in the NPPES registry with a primary specialty of Ophthalmology Physician (Allopathic & Osteopathic Physicians).
- Where is Rex Hsei located?
- Rex Hsei's practice location on file with NPPES is 1665 Dominican Way, Santa Cruz, CA 95065-1528.
- What is Rex Hsei's phone number?
- The practice phone number listed in the NPPES registry for Rex Hsei is (831) 475-7012.
- Does Rex Hsei accept Medicare?
- Rex Hsei is approved to bill Medicare according to CMS PECOS enrollment data (2026.04.01). Confirm current participation with the provider before scheduling.
- Is Rex Hsei's NPI active?
- Yes — Rex Hsei's NPI (1285637157) is active in the NPPES registry as of the last update on 2007-07-08.
Source: CMS NPPES Data Dissemination (June 2026). NPI Central is not affiliated with CMS. Data is provided as-is from the public registry.