DR. MARIANO RAMIREZ LIBROJO JR. M.D.
NPI 1689867533
Internal Medicine in Norwich, CT
About Dr. Mariano Ramirez Librojo Jr. M.d. NPPES
Official registry information on file with the National Plan and Provider Enumeration System.
DR. MARIANO RAMIREZ LIBROJO JR. M.D. (NPI 1689867533) is an individual internal medicine provider in Norwich, Connecticut, licensed in Connecticut (045898) and active in the NPI registry since August 2007. He is enrolled in Medicare PECOS and is a graduate of Other (2003).
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
Dr. Mariano Ramirez Librojo Jr. M.d. 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
2Medicare enrollment records show Mariano Librojo reassigns Medicare billing to 2 organizations. Each organization bills Medicare for the services this provider delivers there; the nearest is listed first.
Norwich, CT 06360
- Reassigned Medicare billing, Connecticut enrollment
- 430 clinicians in this Medicare group
Willimantic, CT 06226
- Reassigned Medicare billing, Connecticut enrollment
- 302 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
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.
Physician Visit Costs CMS claims · ZIP area
Typical Medicare office-visit costs in the 06360 ZIP code area, from fee-for-service claims. These are area statistics, not this provider’s prices; actual charges vary by service and coverage.
Medicare Quality Performance CMS QPP · MIPS
Performance in the CMS Quality Payment Program: the MIPS final score across four weighted categories, and the individual quality measures reported to Medicare.
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.
NORWICH, CT 06360
NORWICH, CT 06360
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 Mariano Librojo's NPI number?
The NPI number for Mariano Librojo is 1689867533. It was assigned to this individual provider in the NPPES registry on August 23, 2007.
Where is Mariano Librojo located?
Mariano Librojo practices at 326 Washington St, Norwich, CT 06360. The listed phone number is (860) 889-8331.
What is Mariano Librojo's specialty?
The primary specialty registered for this NPI is Internal Medicine with taxonomy code 207R00000X.
Is Mariano Librojo enrolled in Medicare?
Yes. Mariano Librojo 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 Mariano Librojo's services?
According to the CMS Revalidation Reassignment List (October 2026 release), Mariano Librojo reassigns Medicare benefits to 2 organizations: The William W Backus Hospital (Norwich, CT) and Windham Community Memorial Hospital, Inc. (Willimantic, CT). 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 Mariano Librojo's services. Reassignment records can lag staffing changes; confirm current arrangements with the organization.
What insurance does Mariano Librojo accept?
Health plans from Anthem Blue Cross and Blue Shield list Mariano Librojo 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.
When was this NPI record last updated?
The NPPES record for Mariano Librojo was last updated on December 2, 2008. NPI Profile syncs weekly with the NPPES registry data releases published by CMS. This NPI record was last updated 17 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.
# Dr. Mariano Ramirez Librojo Jr., M.D. · NPI 1689867533
Internal Medicine physician in Norwich, Connecticut. Individual provider, active in the CMS NPPES registry since August 23, 2007.
## Identity
- **NPI:** 1689867533 (Entity type: Individual)
- **Enumerated:** August 23, 2007
- **Primary specialty:** Internal Medicine · taxonomy 207R00000X
- **State license:** 045898 (Connecticut)
- **Sole proprietor:** No
## Practice location
- **Address:** 326 WASHINGTON ST, Norwich, CT 06360-2740
- **Phone:** (860) 889-8331
## 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:** 2 organizations under Medicare reassignment (form CMS-855R): The William W Backus Hospital (NPI 1467517235, Norwich, CT); Windham Community Memorial Hospital, Inc. (NPI 1023191467, Willimantic, CT) · CMS Revalidation Reassignment List, October 2026 release
- **Medical school:** Other, class of 2003
## Record status
- **NPPES last updated:** December 2, 2008
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Source: [NPI Profile](https://npiprofile.com/npi/1689867533) · Data from the CMS NPPES public registry.