NPIMap

Individual provider Active NPI

Gretchen Neymar Marrero Lozada

  • Nephrology Physician
  • Miami, FL
National Provider Identifier
1891295812
Registry record updated May 29, 2026
On this page

Key facts

NPPES NPI Registry
Primary specialty
Nephrology PhysicianTaxonomy code 207RN0300X
License
ME173171 Issued in FL
Practice address
1611 NW 12TH Ave
Miami, FL 33136-1005
Phone
(305) 585-1111
NPI assigned
Feb 16, 2018
Last updated
May 29, 2026By the provider in NPPES
Sex
Female
Sole proprietor
No

NPPES NPI Registry

Updated by the provider on May 29, 2026

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

Specialties & licenses 2

Specialty (taxonomy)CodeLicenseStatePrimary
Internal Medicine Physician 207R00000X ME173171 FL
Nephrology Physician 207RN0300X ME173171 FL Primary

Addresses

Primary practice location

1611 NW 12TH Ave
Miami, FL 33136-1005

Mailing address

5555 Ponce de Leon Blvd
Coral Gables, FL 33146-2513

Other practice location 1

5555 Ponce De Leon Blvd
Coral Gables, FL 33146-2513
Phone (305) 243-6251

Medicare participation

Medicare enrollment files
Medicare fee-for-service enrollment
Enrolled in FL
Eligible to order & refer
  • Part B services
  • Medical equipment
  • Home health
  • Power mobility devices
  • Hospice
Green means eligible to order or refer.

Enrollment records 1

Enrollment IDStateProvider typePAC IDDetails
I20250527000193 FL Practitioner - Nephrology 1456870294 Reassigns benefits to 1 organization

Care Compare profile

Medicare Care Compare
Specialty
Nephrology
Education
University of Puerto Rico School of Medicine, 2020
Medicare assignment
Accepts the Medicare-approved amount as payment in full
Telehealth
Offers telehealth services
Group practices
University of MiamiGroup PAC ID 3274795109, 2,346 clinicians

Practice addresses (Care Compare)

1400 NW 12TH Ave
Miami, FL 33136-1003
Phone (305) 689-7272

Hospital & facility affiliations

National Provider Directory

National Provider Directory
Medicare enrollment (NPD)
Enrolled
Credentials
Doctor of Medicine

State licenses

LicenseStateTypeSpecialty
ME173171FLMDNephrology Physician

Practice roles

OrganizationSpecialtyStatusNew patients
University of Miami Current Accepting new patients
University of Miami Internal Medicine CurrentSince May 1, 2025 Accepting new patients
University of Miami Nephrology CurrentSince May 1, 2025 Accepting new patients

Locations

5555 Ponce de Leon Blvd
Coral Gables, FL 33146
Phone (305) 243-2020

4800 NE 20th Ter
Ste 201
Ft Lauderdale, FL 33308
Phone (305) 892-4000

1400 NW 12th Ave
Miami, FL 33136
Phone (305) 325-5416

1611 NW 12th Ave
Miami, FL 33136
Phone (305) 585-6226

1801 NW 9th Ave
Fl 6
Miami, FL 33136
Phone (305) 355-5006

Networks

  • Optimum HealthCare HMO Network
  • Freedom Health HMO Network

Interoperability endpoints

  • Direct secure messaging: gmarrerolozada122449@direct.med.miami.edu

Organizations & group practices 3

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.

Hospital & facility affiliations 24

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

View all 24

NPI Registry JSON

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

{
    "created_epoch": "1518739200000",
    "enumeration_type": "NPI-1",
    "last_updated_epoch": "1780012800000",
    "number": "1891295812",
    "addresses": [
        {
            "country_code": "US",
            "country_name": "United States",
            "address_purpose": "MAILING",
            "address_type": "DOM",
            "address_1": "5555 PONCE DE LEON BLVD",
            "city": "CORAL GABLES",
            "state": "FL",
            "postal_code": "331462513"
        },
        {
            "country_code": "US",
            "country_name": "United States",
            "address_purpose": "LOCATION",
            "address_type": "DOM",
            "address_1": "1611 NW 12TH AVE",
            "city": "MIAMI",
            "state": "FL",
            "postal_code": "331361005",
            "telephone_number": "305-585-1111"
        }
    ],
    "practiceLocations": [
        {
            "address_1": "5555 Ponce De Leon Blvd",
            "address_purpose": "LOCATION",
            "city": "Coral Gables",
            "state": "FL",
            "postal_code": "331462513",
            "country_code": "US",
            "telephone_number": "305-243-6251",
            "country_name": "United States",
            "address_type": "DOM"
        }
    ],
    "basic": {
        "last_name": "MARRERO LOZADA",
        "first_name": "GRETCHEN",
        "middle_name": "NEYMAR",
        "sole_proprietor": "NO",
        "sex": "F",
        "enumeration_date": "2018-02-16",
        "last_updated": "2026-05-29",
        "certification_date": "2026-05-29",
        "status": "A"
    },
    "taxonomies": [
        {
            "code": "207R00000X",
            "taxonomy_group": "",
            "desc": "Internal Medicine",
            "state": "FL",
            "license": "ME173171",
            "primary": false
        },
        {
            "code": "207RN0300X",
            "taxonomy_group": "",
            "desc": "Internal Medicine, Nephrology",
            "state": "FL",
            "license": "ME173171",
            "primary": true
        }
    ],
    "identifiers": [],
    "endpoints": [],
    "other_names": []
}

Other providers in Miami, FL

Sources for this page

Verify at the official NPI Registry.