Louis Mariano Santiago, MD

Primary specialty

Internal Medicine PhysicianTaxonomy code 207R00000X

License

25MA12764900 Issued in NJ

Practice address

400 S Greenwood Ave
Easton, PA 18045-3776

Phone

(484) 503-3073

NPI assigned

Jun 3, 2022

Sex

Male

Sole proprietor

Yes

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 NJ

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, 2022

Medicare assignment

Accepts the Medicare-approved amount as payment in full

Group practices

Rwjbh Emergency Medicine Associates, LLCGroup PAC ID 0941612840, 826 clinicians

Practice addresses (Care Compare)

Medicare enrollment (NPD)

Enrolled

Credentials

Doctor of Medicine

State licenses

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

• Rwjbh Emergency Medicine Associates, LLC

  • Emergency Medicine Physician
  • Somerset, NJ
  • NPI 1912510041
  Medicare reassignment Care Compare group
• Rwjbh Observation Associates LLC

  • Emergency Medicine Physician
  • Livingston, NJ
  • NPI 1760095806
  Medicare reassignment

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

{
    "created_epoch": "1654214400000",
    "enumeration_type": "NPI-1",
    "last_updated_epoch": "1777593600000",
    "number": "1225777568",
    "addresses": [
        {
            "country_code": "US",
            "country_name": "United States",
            "address_purpose": "MAILING",
            "address_type": "DOM",
            "address_1": "400 S GREENWOOD AVE",
            "city": "EASTON",
            "state": "PA",
            "postal_code": "180453776",
            "telephone_number": "484-503-3073"
        },
        {
            "country_code": "US",
            "country_name": "United States",
            "address_purpose": "LOCATION",
            "address_type": "DOM",
            "address_1": "400 S GREENWOOD AVE",
            "city": "EASTON",
            "state": "PA",
            "postal_code": "180453776",
            "telephone_number": "484-503-3073"
        }
    ],
    "practiceLocations": [],
    "basic": {
        "last_name": "SANTIAGO",
        "first_name": "LOUIS",
        "middle_name": "MARIANO",
        "name_prefix": "Dr.",
        "credential": "MD",
        "sole_proprietor": "YES",
        "sex": "M",
        "enumeration_date": "2022-06-03",
        "last_updated": "2026-05-01",
        "certification_date": "2026-05-01",
        "status": "A"
    },
    "taxonomies": [
        {
            "code": "207R00000X",
            "taxonomy_group": "",
            "desc": "Internal Medicine",
            "state": "NJ",
            "license": "25MA12764900",
            "primary": true
        },
        {
            "code": "207R00000X",
            "taxonomy_group": "193400000X SINGLE SPECIALTY  GROUP",
            "desc": "Internal Medicine",
            "state": "PA",
            "license": "MT226865",
            "primary": false
        }
    ],
    "identifiers": [],
    "endpoints": [],
    "other_names": []
}

• Sanctus Pharmacy Inc
• Karn Singh Sandhu, MD
• Sang T Lee MD PC
• Antoinette Santee
• Tiara Santi
• Christopher Tate Santos, MA, LPC
• Kalah Santos
• Meinardo Santos III, PA
• Priscilla Elisabeth Santos, MA, LPC
• Jenna Sapone, MD

• Internal Medicine Physician in Easton, PA
• Providers in Easton, PA by specialty
• Internal Medicine Physician in Pennsylvania

• NPPES NPI Registry (CMS): identity, addresses, specialties, licenses, identifiers and endpoints. Last updated by the provider on May 1, 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.