JOHN CARLO MERCADO MD
NPI 1861889495
Emergency Medicine in Baton Rouge, LA
About John Carlo Mercado Md NPPES
Official registry information on file with the National Plan and Provider Enumeration System.
JOHN CARLO MERCADO MD (NPI 1861889495) is an individual emergency medicine provider in Baton Rouge, Louisiana, licensed in Georgia (80153) and active in the NPI registry since April 2015. He is enrolled in Medicare PECOS, is affiliated with Ochsner Medical Center Acute, and is a graduate of Other (2015).
NPPES Registry Identity
Specialties & Licenses
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
John Carlo Mercado Md 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 Reassignments
10Medicare enrollment records show John Mercado reassigns Medicare billing to 10 organizations. Each organization bills Medicare for the services this provider delivers there; the nearest is listed first.
Baton Rouge, LA 70808
- Reassigned Medicare billing, Louisiana enrollment
- 147 clinicians in this Medicare group
Baton Rouge, LA 70836
- Reassigned Medicare billing, Louisiana enrollment
- 4,559 clinicians in this Medicare group
La Place, LA 70068
- Reassigned Medicare billing, Louisiana enrollment
- 120 clinicians in this Medicare group
Luling, LA 70070
- Reassigned Medicare billing, Louisiana enrollment
- 114 clinicians in this Medicare group
Kenner, LA 70065
- Reassigned Medicare billing, Louisiana enrollment
- 181 clinicians in this Medicare group
Metairie, LA 70001
- Reassigned Medicare billing, Louisiana enrollment
- 114 clinicians in this Medicare group
New Orleans, LA 70115
- Reassigned Medicare billing, Louisiana enrollment
- 240 clinicians in this Medicare group
Bogalusa, LA 70427
- Reassigned Medicare billing, Louisiana enrollment
- 91 clinicians in this Medicare group
Lufkin, TX 75904
- Reassigned Medicare billing, Louisiana enrollment
- 101 clinicians in this Medicare group
Lubbock, TX 79401
- Reassigned Medicare billing, Louisiana enrollment
- 214 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.
Areas of Expertise CMS Part B claims 3
Services this provider delivered to Medicare fee-for-service patients, from the CMS Medicare utilization data. Higher counts generally reflect more experience with a service; care delivered outside Medicare is not included.
Hospital Affiliations CMS Care Compare 2
Hospitals where this provider delivers care, identified from recent Medicare claims and place-of-service records.
Ochsner Medical Center Acute
Acute Care Hospitals · New Orleans, LAOchsner Medical Center-Kenner
Acute Care Hospitals · Kenner, LAPhysician Visit Costs CMS claims · ZIP area
Typical Medicare office-visit costs in the 70808 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.
BATON ROUGE, LA 70808
BATON ROUGE, LA 70808
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 John Mercado's NPI number?
The NPI number for John Mercado is 1861889495. It was assigned to this individual provider in the NPPES registry on April 21, 2015.
Where is John Mercado located?
John Mercado practices at 5000 Hennessy Blvd, Baton Rouge, LA 70808. The listed phone number is (225) 765-6565.
What is John Mercado's specialty?
The primary specialty registered for this NPI is Emergency Medicine with taxonomy code 207P00000X.
Is John Mercado enrolled in Medicare?
Yes. John Mercado 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 organizations bill Medicare for John Mercado's services?
According to the CMS Revalidation Reassignment List (October 2026 release), John Mercado reassigns Medicare benefits to 10 organizations: Professional Emergency Physician Associates, LLC (Baton Rouge, LA), Ochsner Clinic LLC (Baton Rouge, LA), St. John Emergency Group LLC (La Place, LA), Luling Emergency Group LLC (Luling, LA), Kenner Emergency Group LLC (Kenner, LA) and 5 more organizations, listed in the Medicare section above. Each 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 John Mercado's services. Reassignment records can lag staffing changes; confirm current arrangements with the organization.
What insurance does John Mercado accept?
Health plans from CHRISTUS Health Plan and HMO Louisiana list John Mercado 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 John Mercado affiliated with any hospitals?
According to CMS data, John Mercado is affiliated with Ochsner Medical Center Acute and Ochsner Medical Center-Kenner.
When was this NPI record last updated?
The NPPES record for John Mercado was last updated on May 23, 2024. NPI Profile syncs weekly with the NPPES registry data releases published by CMS. This NPI record was last updated 2 years 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.
# John Carlo Mercado, MD · NPI 1861889495
Emergency Medicine physician in Baton Rouge, Louisiana. Individual provider, active in the CMS NPPES registry since April 21, 2015.
## Identity
- **NPI:** 1861889495 (Entity type: Individual)
- **Enumerated:** April 21, 2015
- **Primary specialty:** Emergency Medicine · taxonomy 207P00000X
- **State license:** 80153 (Georgia)
- **Sole proprietor:** Yes
## Practice location
- **Address:** 5000 HENNESSY BLVD, Baton Rouge, LA 70808
- **Phone:** (225) 765-6565
## 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:** 10 organizations under Medicare reassignment (form CMS-855R): Professional Emergency Physician Associates, LLC (NPI 1992758247, Baton Rouge, LA); Ochsner Clinic LLC (NPI 1407848443, Baton Rouge, LA); St. John Emergency Group LLC (NPI 1265401509, La Place, LA); Luling Emergency Group LLC (NPI 1528446101, Luling, LA); Kenner Emergency Group LLC (NPI 1013986546, Kenner, LA); and 5 more · CMS Revalidation Reassignment List, October 2026 release
- **Medical school:** Other, class of 2015
## Record status
- **NPPES last updated:** May 23, 2024
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Source: [NPI Profile](https://npiprofile.com/npi/1861889495) · Data from the CMS NPPES public registry.