Gretchen Neymar Marrero Lozada
Nephrology Physician · Miami, FL
Gretchen Neymar Marrero Lozada is a nephrology physician with a practice address in Miami, Florida, and NPI 1891295812, issued on Feb 16, 2018. Check the license (Florida ME173171, as entered in NPPES) on the Florida health license search; the Medicare figures below come from public CMS files.
- Name
- Gretchen Neymar Marrero Lozada
- Primary taxonomy
- Nephrology Physician 207RN0300X
- License number
- ME173171 FL
Self-reported in NPPES; status is on the state search - Practice location
- 1611 NW 12TH Ave, Miami, FL 33136
- Phone
- (305) 585-1111
- Enumerated
- Feb 16, 2018
- Record last updated
- May 29, 2026
- Medicare enrollment
- Enrolled (PECOS I20250527000193); accepts Medicare assignment
- Medical or professional school
- University Of Puerto Rico School Of Medicine, 2020
- Telehealth
- Offers telehealth (CMS)
- Entity
- Type 1 · individual
8 nearest nephrology physician records → All 840 in Florida → Look up another NPI →
Also registered at 1611 NW 12TH Ave
A shared address usually means a shared clinic or building; it does not show who employs whom.
- Morgan AaronStudent in an Organized Health Care Education/Training Program1003676636
- Tonya Aaron, MDPHDStudent in an Organized Health Care Education/Training Program1407640071
- Joel AbadStudent in an Organized Health Care Education/Training Program1609570688
- Miguel Abalo, MDAnesthesiology Physician1700248457
- Nadia AbbassStudent in an Organized Health Care Education/Training Program1366249815
- Ahmed Abdelkader, MD, MSC.Student in an Organized Health Care Education/Training Program1225973712
Verify Gretchen Neymar Marrero Lozada in five checks
- 1IdentityNPI record in CMS NPPESNPI lookupConfirmed in NPPES
- 2LicenseActive license and public ordersFlorida health license search
Search for license ME173171Check the board - 3Other statesLicenses and actions elsewhereDocInfo (FSMB)Not checked
- 4ExclusionsMedicare and Medicaid bansHHS-OIG exclusion listNot checked
- 5CertificationBoard certificationABMS AOA NCCPA AANPNot checked
93% fewer Medicare Part D claims than the average nephrology physician in 2024
104 Medicare Part D claims for 18 beneficiaries, against an average of 1,465 among the 10,986 providers of this specialty who prescribed in Part D. Brand-name drugs were 29% of claims.
Most prescribed
- Farxiga21 claims
Source: CMS Medicare Part D Prescribers by Provider and Drug, 2024 (data.cms.gov). Part D covers prescriptions for Medicare patients only; drugs with fewer than 11 claims are not published.
Industry payments in 2024: $28.14
1 payment: food and beverage; the largest payer was Baxter Healthcare. The 8,230 providers of this specialty with any payment received $3,091.37 on average. Payments are reported by manufacturers, not by the provider, and are not a sign of wrongdoing.
Source: CMS Open Payments, program year 2024 (openpaymentsdata.cms.gov); average among providers of this specialty with at least one payment.
Bills Medicare through one group practice
- University OF MiamiMiami, FL
Source: CMS Doctors and Clinicians National Downloadable File (the group practices a clinician bills Medicare through) (data.cms.gov).
Gretchen Neymar Marrero Lozada among 840 nephrology physician records in Florida
Gretchen Neymar Marrero Lozada is one of 840 nephrology physician records with a practice address in Florida. 88% of them appear in a Medicare file (Part D prescribing, MIPS, Open Payments or Medicare group billing); this one does. Its NPI, issued in 2018, is newer than 90% of them.
- NPI issued2018 · 90% of these records are older, 7% newer
- In a Medicare fileYes · 88% of these records are
- In the CMS Doctors and Clinicians fileYes · 79% of these records are
- Graduated2020 · median 2000 among the 664 with a school on file
- Record last updated2026 · 56% of these records were not updated in five years or more
Source: CMS NPPES, file of Aug 9, 2026, every record with primary taxonomy 207RN0300X and a Florida practice address; Medicare files: CMS Part D Prescribers 2024, MIPS 2023, Open Payments 2024, Doctors and Clinicians (data.cms.gov).
Nephrology Physician providers in Florida
There are 840 nephrology physician records in Florida.
All 840 in Florida → Every provider in Miami → Nephrology Physician nationwide →
The 8 nephrology physician records with the nearest ZIP codes
- Gabriel Contreras, MD, MPHMiami, FL 331361891723383
- Alessia Fornoni, MD, PHDMiami, FL 331361891724118
- Giselle Guerra, MDMiami, FL 331361841230299
- Warren Kupin, MDMiami, FL 331361568408532
- Marco Ladino Avellaneda, M.D.Miami, FL 331361831308162
- Oliver Lenz, MDMiami, FL 331361992735039
- Adela Mattiazzi, MDMiami, FL 331361922200260
- Leopoldo Raij, MDMiami, FL 331361720010879
Common questions
What is Gretchen Neymar Marrero Lozada's NPI number?
Gretchen Neymar Marrero Lozada's National Provider Identifier (NPI) is 1891295812, issued on Feb 16, 2018. An NPI identifies a provider in billing; it is not a license.
Where is Gretchen Neymar Marrero Lozada located?
The NPPES record lists a practice address at 1611 NW 12TH Ave, Miami, FL, 33136. Phone: (305) 585-1111. Providers update this record themselves, so call before visiting.
How can I verify Gretchen Neymar Marrero Lozada's license?
NPPES lists Florida license number ME173171, as entered by the provider. Search the Florida health license search at https://mqa-internet.doh.state.fl.us/mqasearchservices/healthcareproviders. The NPPES record confirms identity only; the state search shows license status, expiration and public orders.
How much does Gretchen Neymar Marrero Lozada prescribe under Medicare Part D?
In 2024, Gretchen Neymar Marrero Lozada had 104 Medicare Part D claims for 18 beneficiaries; the average among nephrology physician prescribers was 1,465. Part D covers Medicare prescriptions only.
Source: CMS National Plan and Provider Enumeration System (NPPES), file of Aug 9, 2026 (NPPES files on CMS.gov); NUCC Health Care Provider Taxonomy. Medicare files from data.cms.gov. An NPI identifies who bills; it is not a license.
Figures on PlainDoctor are read from the federal files each page names (CMS NPPES, Medicare Part D, MIPS, Open Payments; the HHS-OIG exclusion list only as counts) and from Census population estimates, with the file date shown beside them. See our editorial standards & corrections policy, the methodology behind these numbers, or report a data error. Data current as of Aug 9, 2026.