Rex Chen Hsei, MD

Primary specialty

Ophthalmology PhysicianTaxonomy code 207W00000X

License

A71449 Issued in CA

Practice address

1665 Dominican Way
Ste 124
Santa Cruz, CA 95065-1528

Phone

(831) 475-7012

NPI assigned

May 24, 2005

Last updated

Jul 13, 2026By the provider in NPPES

Sex

Male

Sole proprietor

No

Registry information is reported by the provider to CMS and is not verified. About this source

Specialties & licenses 1

Addresses

Medicare fee-for-service enrollment

Enrolled in CA

Eligible to order & refer

• Part B services: Yes
• Medical equipment: Yes
• Home health: Yes
• Power mobility devices: Yes
• Hospice: Yes

Green means eligible to order or refer.

Enrollment records 1

Specialty

Ophthalmology

Education

Hahnemann University College of Medicine, 1996

Medicare assignment

Accepts the Medicare-approved amount as payment in full

Group practices

Bay Eye Medical Group IncGroup PAC ID 4486621745, shared by 2 NPIs, 6 clinicians

Practice addresses (Care Compare)

Merit-based Incentive Payment System (MIPS)

Final score

98.49 of 100Reported as individual

Quality

100

Improvement activities

40

Cost

78.32

Procedures performed for Medicare patients

Medicare enrollment (NPD)

Enrolled

Credentials

Doctor of Medicine

State licenses

Practice roles

Locations

Organizations this provider is connected to: Medicare benefit reassignments (the organization bills Medicare for this provider’s services), Care Compare group memberships, National Provider Directory roles and organizations whose NPPES authorized official is this provider.

• Bay Eye Medical Group Inc

  • Medical Specialty Clinic/Center
  • Watsonville, CA
  • NPI 1447439583
  Medicare reassignment NPD Authorized official
• Bay Eye Medical Group Inc

  • Medical Specialty Clinic/Center
  • Santa Cruz, CA
  • NPI 1801899646

  Ophthalmology

  Medicare reassignment NPD Authorized official
• Dignity Health

  dba Dominican Hospital

  • General Acute Care Hospital
  • Santa Cruz, CA
  • NPI 1427181007

  Ophthalmology

  NPD (past)
• Stanford Hospital and Clinics

  dba SHC Reference Laboratory

  • Clinical Medical Laboratory
  • Palo Alto, CA
  • NPI 1174698468
  NPD (past)
• Watsonville Hospital Corporation

  dba Watsonville Community Hospital

  • General Acute Care Hospital
  • Watsonville, CA
  • NPI 1710958228
  NPD (past)

The complete NPPES record for this NPI in the NPI Registry API format.

{
    "created_epoch": "1116892800000",
    "enumeration_type": "NPI-1",
    "last_updated_epoch": "1783900800000",
    "number": "1285637157",
    "addresses": [
        {
            "country_code": "US",
            "country_name": "United States",
            "address_purpose": "MAILING",
            "address_type": "DOM",
            "address_1": "1665 DOMINICAN WAY",
            "address_2": "STE 124",
            "city": "SANTA CRUZ",
            "state": "CA",
            "postal_code": "950651528",
            "telephone_number": "831-475-7012"
        },
        {
            "country_code": "US",
            "country_name": "United States",
            "address_purpose": "LOCATION",
            "address_type": "DOM",
            "address_1": "1665 DOMINICAN WAY",
            "address_2": "STE 124",
            "city": "SANTA CRUZ",
            "state": "CA",
            "postal_code": "950651528",
            "telephone_number": "831-475-7012"
        }
    ],
    "practiceLocations": [],
    "basic": {
        "last_name": "HSEI",
        "first_name": "REX",
        "middle_name": "CHEN",
        "credential": "MD",
        "sole_proprietor": "NO",
        "sex": "M",
        "enumeration_date": "2005-05-24",
        "last_updated": "2026-07-13",
        "status": "A"
    },
    "taxonomies": [
        {
            "code": "207W00000X",
            "taxonomy_group": "",
            "desc": "Ophthalmology",
            "state": "CA",
            "license": "A71449",
            "primary": true
        }
    ],
    "identifiers": [],
    "endpoints": [],
    "other_names": []
}

• Stephanie Howard
• Lisa M Howe
• Katherine S Howenstine
• Jeff Howlin, ED.D.
• Hillary Lene Howson, MA
• Melvin Hsu, RBT
• Jonathan C Hu, MD
• Gloria Hua
• Audrey Huang, RN
• Qiuying Huang, D.O.

• Ophthalmology Physician in Santa Cruz, CA
• Providers in Santa Cruz, CA by specialty
• Ophthalmology Physician in California

• NPPES NPI Registry (CMS): identity, addresses, specialties, licenses, identifiers and endpoints. Last updated by the provider on Jul 13, 2026; self-reported and not verified by CMS. Specialty names from the NUCC taxonomy.
• Medicare enrollment (CMS PECOS): enrollments, PAC IDs and benefit reassignments; Order and Referring.
• Medicare Care Compare (CMS): clinician profile, group practices, facility affiliations, MIPS scores and star ratings.
• National Provider Directory (CMS): practice roles, locations, licenses, networks and endpoints.

Verify at the official NPI Registry.