GRETCHEN NEYMAR MARRERO LOZADA
NPI 1891295812
Internal Medicine - Nephrology in Miami, FL
About Gretchen Neymar Marrero Lozada NPPES
Official registry information on file with the National Plan and Provider Enumeration System.
GRETCHEN NEYMAR MARRERO LOZADA (NPI 1891295812) is an individual nephrology provider in Miami, Florida, licensed in Florida (ME173171) and active in the NPI registry since February 2018. She is enrolled in Medicare PECOS, is affiliated with Jackson Health System, and maintains a secondary practice location in Coral Gables.
NPPES Registry Identity
Specialties & Licenses 2
Secondary Practice Location 1
Accepted Insurance
Medicare Participation & PECOS CMS
Medicare enrollment, assignment, billing reassignment, and ordering and referring status from CMS.
Medicare Enrollment Status
Enrolled in Medicare and accepts Medicare assignment
Gretchen Neymar Marrero Lozada is registered in PECOS and agrees to accept the Medicare-approved amount as full payment. Medicare patients are not billed beyond the standard deductible and coinsurance.
Medicare Billing Reassignment
Medicare enrollment records show Gretchen Marrero Lozada reassigns Medicare billing to 1 organization. The organization bills Medicare for the services this provider delivers there.
Miami, FL 33136
- Reassigned Medicare billing, Florida enrollment
- 3,639 clinicians in this Medicare group
Source: CMS Revalidation Reassignment List, October 2026 release. Reassignment records can lag staffing changes; confirm a current affiliation with the organization.
Hospital Affiliations CMS Care Compare
Hospitals where this provider delivers care, identified from recent Medicare claims and place-of-service records.
Jackson Health System
Acute Care Hospitals · Miami, FLPhysician Visit Costs CMS claims · ZIP area
Typical Medicare office-visit costs in the 33136 ZIP code area, from fee-for-service claims. These are area statistics, not this provider’s prices; actual charges vary by service and coverage.
Other Providers at the Same Location NPPES 20
Providers registered at the same practice address, or within the immediate area, according to the NPPES registry.
MIAMI, FL 33136
MIAMI, FL 33136
MIAMI, FL 33136
MIAMI, FL 33136
Frequently Asked Questions NPPES & CMS
Common questions about this NPI record, answered from the official NPPES registry and CMS datasets shown on this page.
What is Gretchen Marrero Lozada's NPI number?
The NPI number for Gretchen Marrero Lozada is 1891295812. It was assigned to this individual provider in the NPPES registry on February 16, 2018.
Where is Gretchen Marrero Lozada located?
Gretchen Marrero Lozada practices at 1611 NW 12th Ave, Miami, FL 33136. The listed phone number is (305) 585-1111.
What is Gretchen Marrero Lozada's specialty?
The primary specialty registered for this NPI is Internal Medicine, specializing in Nephrology, with taxonomy code 207RN0300X.
Is Gretchen Marrero Lozada enrolled in Medicare?
Yes. Gretchen Marrero Lozada is registered in the Medicare PECOS system and accepts Medicare assignment, which means accepting the Medicare-approved amount as payment in full for covered services.
Which organization bills Medicare for Gretchen Marrero Lozada's services?
According to the CMS Revalidation Reassignment List (October 2026 release), Gretchen Marrero Lozada reassigns Medicare benefits to University Of Miami (Miami, FL). The reassignment is filed with Medicare on form CMS-855R, signed by both the clinician and the organization, and lets the organization bill Medicare and receive payment for Gretchen Marrero Lozada's services. Reassignment records can lag staffing changes; confirm current arrangements with the organization.
What insurance does Gretchen Marrero Lozada accept?
Health plans from Ambetter Health, Ambetter of Alabama, AmeriHealth Caritas Next, Florida Blue (BlueCross BlueShield FL) and Florida Blue HMO (a BlueCross BlueShield FL company) and 1 other insurer list Gretchen Marrero Lozada as in-network in at least one marketplace plan. Coverage varies by plan and year; verify with the insurer or the provider before a visit.
Is Gretchen Marrero Lozada affiliated with any hospitals?
According to CMS data, Gretchen Marrero Lozada is affiliated with Jackson Health System.
When was this NPI record last updated?
The NPPES record for Gretchen Marrero Lozada was last updated on May 29, 2026. NPI Profile syncs weekly with the NPPES registry data releases published by CMS. This NPI record was last updated 4 months ago. If this record has changed at CMS more recently, you can request an on-demand re-check against the live CMS registry, directly from this page.
# Gretchen Neymar Marrero Lozada · NPI 1891295812
Nephrology physician in Miami, Florida. Individual provider, active in the CMS NPPES registry since February 16, 2018.
## Identity
- **NPI:** 1891295812 (Entity type: Individual)
- **Enumerated:** February 16, 2018
- **Primary specialty:** Internal Medicine - Nephrology · taxonomy 207RN0300X
- **State license:** ME173171 (Florida)
- **Sole proprietor:** No
## Practice location
- **Address:** 1611 NW 12TH AVE, Miami, FL 33136-1005
- **Phone:** (305) 585-1111
## Medicare
- **Medicare:** Enrolled (PECOS); accepts Medicare assignment
- **Ordering & referring:** eligible for Part B labs & imaging, durable medical equipment, home health, power mobility devices
- **Bills Medicare through:** University Of Miami (NPI 1013967827, Miami, FL), under Medicare reassignment (form CMS-855R) · CMS Revalidation Reassignment List, October 2026 release
- **Medical school:** University Of Puerto Rico School Of Medicine, class of 2020
## Record status
- **NPPES last updated:** May 29, 2026
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Source: [NPI Profile](https://npiprofile.com/npi/1891295812) · Data from the CMS NPPES public registry.