Ryan Alistair John Marais, MD

Primary specialty

Internal Medicine PhysicianTaxonomy code 207R00000X

License

A192109 Issued in CA

Practice address

11370 Anderson St Ste 3150
Loma Linda, CA 92354-3450

Phone

(909) 558-2191

NPI assigned

Apr 12, 2021

Last updated

Jul 23, 2025By 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 2

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

Internal Medicine

Education

Other, 2021

Medicare assignment

Accepts the Medicare-approved amount as payment in full

Telehealth

Offers telehealth services

Group practices

Faculty Physicians and Surgeons of LlusmGroup PAC ID 1153227814, 1,313 clinicians

Sac Health SystemGroup PAC ID 4385533579, 222 clinicians

Practice addresses (Care Compare)

Hospital & facility affiliations

• Bridge Home Health Home health agency, Ontario, CA, CCN 559063
• Loma Linda University Medical Center Hospital, Loma Linda, CA, CCN 050327

Medicare enrollment (NPD)

Enrolled

Credentials

Doctor of Medicine

State licenses

Practice roles

Locations

Interoperability endpoints

• Direct secure messaging: rmarais373122@direct.llu.edu

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.

• Faculty Physicians and Surgeons of Llusm

  • Thoracic Surgery (Cardiothoracic Vascular Surgery) Physician
  • Apple Valley, CA
  • NPI 1205009917
  Medicare reassignment Care Compare group NPD
• Sac Health System

  dba SAC Arrowhead

  • Federally Qualified Health Center (FQHC)
  • San Bernardino, CA
  • NPI 1013935923
  Medicare reassignment Care Compare group NPD
• Faculty Physicians and Surgeons of Llusm

  • Pediatrics Physician
  • San Bernardino, CA
  • NPI 1124077516
  NPD
• Faculty Physicians and Surgeons of Llusm

  • Neurological Surgery Physician
  • Loma Linda, CA
  • NPI 1194775122
  NPD
• Faculty Physicians and Surgeons of Llusm

  • Ophthalmology Physician
  • Loma Linda, CA
  • NPI 1437109469
  NPD
• Faculty Physicians and Surgeons of Llusm

  • Family Medicine Physician
  • Moreno Valley, CA
  • NPI 1558788331
  NPD
• Sac Health System

  • Federally Qualified Health Center (FQHC)
  • Murrieta, CA
  • NPI 1164045522
  NPD
• Sac Health System

  • Federally Qualified Health Center (FQHC)
  • San Bernardino, CA
  • NPI 1467274126
  NPD
• Faculty Physicians and Surgeons of Llusm

  • Orthopaedic Surgery Physician
  • Loma Linda, CA
  • NPI 1275582918
  NPD (past)
• Loma Linda University Physicians Medical Group Inc

  • Internal Medicine Physician
  • Loma Linda, CA
  • NPI 1841230109
  NPD (past)

Hospitals and other facilities this clinician is affiliated with according to Medicare Care Compare.

• Bridge Home Health Services Inland Empire

  dba Bridge Home Health

  • Home Health Agency
  • Ontario, CA
  • NPI 1275023491
  Care Compare affiliation
• Loma Linda University Medical Center

  • General Acute Care Hospital
  • Loma Linda, CA
  • NPI 1194731935
  Care Compare affiliation

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

{
    "created_epoch": "1618185600000",
    "enumeration_type": "NPI-1",
    "last_updated_epoch": "1753228800000",
    "number": "1922688282",
    "addresses": [
        {
            "country_code": "US",
            "country_name": "United States",
            "address_purpose": "MAILING",
            "address_type": "DOM",
            "address_1": "11234 ANDERSON ST",
            "city": "LOMA LINDA",
            "state": "CA",
            "postal_code": "923542804"
        },
        {
            "country_code": "US",
            "country_name": "United States",
            "address_purpose": "LOCATION",
            "address_type": "DOM",
            "address_1": "11370 ANDERSON ST STE 3150",
            "city": "LOMA LINDA",
            "state": "CA",
            "postal_code": "923543450",
            "telephone_number": "909-558-2191"
        }
    ],
    "practiceLocations": [],
    "basic": {
        "last_name": "MARAIS",
        "first_name": "RYAN",
        "middle_name": "ALISTAIR JOHN",
        "name_prefix": "Dr.",
        "credential": "MD",
        "sole_proprietor": "NO",
        "sex": "M",
        "enumeration_date": "2021-04-12",
        "last_updated": "2025-07-23",
        "certification_date": "2025-07-23",
        "status": "A"
    },
    "taxonomies": [
        {
            "code": "390200000X",
            "taxonomy_group": "",
            "desc": "Student in an Organized Health Care Education/Training Program",
            "state": null,
            "license": null,
            "primary": false
        },
        {
            "code": "207R00000X",
            "taxonomy_group": "",
            "desc": "Internal Medicine",
            "state": "CA",
            "license": "A192109",
            "primary": true
        }
    ],
    "identifiers": [],
    "endpoints": [],
    "other_names": []
}

• Jared R Manrique
• Nicole Mansur, PA-C
• Sungguh Manullang
• Lisa Barbosa Manzanete
• Denise Mao
• Mary Catherine Marciniak
• Rose Lily Marendes, NP STUDENT
• Mariam Amiri (Loma Linda Ambulatory Surgical Center)
• Mariam Amiri (Loma Linda Foot and Ankle Center)
• Mariam S Amiri D P M Professional Corporation (Loma Linda Ambulatory Surgical Ctr)

• Internal Medicine Physician in Loma Linda, CA
• Providers in Loma Linda, CA by specialty
• Internal Medicine Physician in California

• NPPES NPI Registry (CMS): identity, addresses, specialties, licenses, identifiers and endpoints. Last updated by the provider on Jul 23, 2025; 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.