Gretchen Neymar Marrero Lozada
Individual provider Active NPI Nephrology Physician · Miami, FL
NPI 1891295812 · NPPES record last updated May 29, 2026
Key facts
- NPI
- 1891295812
- Entity type
- Individual (NPI type 1)
- Primary specialty
- Nephrology Physician 207RN0300X
- License
- ME173171 (FL)
- Practice address
- 1611 NW 12TH Ave
Miami, FL 33136-1005 - Phone
- (305) 585-1111
- NPI assigned
- Feb 16, 2018
- Sex
- Female
- Sole proprietor
- No
Organizations & group practices 7
Hospital & facility affiliations 24
Medicare Care Compare profile
- 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 Miami
Practice addresses (Care Compare)
1400 NW 12TH Ave
Miami, FL 33136-1003
Phone (305) 689-7272
Hospital & facility affiliations
- Univ of Miami Hospital and Clinics-Sylvester Compr
- Jackson Health System
Medicare participation
- Medicare fee-for-service enrollment
- Enrolled in FL
- Eligible to order & refer
- Part B services: Yes · DME: Yes · Home health: Yes · Power mobility devices: Yes · Hospice: Yes
Medicare enrollment records
| Enrollment ID | State | Provider type | PAC ID | Details |
|---|---|---|---|---|
| I20250527000193 | FL | Practitioner - Nephrology | 1456870294 | Reassigns benefits to 1 organization |
National Provider Directory
- Medicare enrollment (NPD)
- Yes
- Credentials
- Doctor of Medicine
State licenses
| License | State | Type | Specialty |
|---|---|---|---|
| ME173171 | FL | MD | Nephrology Physician |
Practice roles (3 of 5)
| Organization | Specialty | Status | New patients |
|---|---|---|---|
| University of Miami | Current | Accepting new patients | |
| University of Miami | Nephrology | Current |
Accepting new patients |
| University of Miami | Internal Medicine | Current |
Accepting new patients |
Locations
5555 Ponce de Leon Blvd
Coral Gables, FL 33146
Phone (305) 585-1052
4800 NE 20th Ter
Ste 201
Ft Lauderdale, FL 33308
Phone (305) 892-4000
1611 NW 12th Ave
Miami, FL 33136
Phone (305) 585-6226
1400 NW 12th Ave
Miami, FL 33136
Phone (305) 325-5416
1801 NW 9th Ave
Fl 6
Miami, FL 33136
Phone (305) 355-5006
Networks
- Optimum HealthCare HMO Network
- Freedom Health HMO Network
Interoperability endpoints
- gmarrerolozada122449@direct.med.miami.edu
Specialties & licenses
| Specialty (taxonomy) | Code | License | State | Primary |
|---|---|---|---|---|
| Internal Medicine Physician | 207R00000X | ME173171 | FL | |
| Nephrology Physician | 207RN0300X | ME173171 | FL | Yes |
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
NPI Registry JSON
{
"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": []
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Sources for this page
- NPPES NPI Registry (CMS): identity, addresses, specialties, licenses, identifiers and endpoints. Record last updated by the provider on May 29, 2026. Information in NPPES is self-reported and not verified by CMS.
- NUCC Health Care Provider Taxonomy: specialty names.
- Medicare Fee-For-Service Public Provider Enrollment (CMS/PECOS): enrollments, PAC IDs and benefit reassignments.
- Order and Referring (CMS).
- Medicare Care Compare provider data (CMS): clinician profile, group practices, facility affiliations, MIPS scores and star ratings.
- National Provider Directory (CMS): practice roles, locations, licenses, networks and endpoints.