GRETCHEN GIOVANNA DE DIEGO CORNIER M.D.
NPI 1851824007
Student in an Organized Health Care Education/Training Program in New York, NY
About Gretchen Giovanna De Diego Cornier M.d. NPPES
Official registry information on file with the National Plan and Provider Enumeration System.
GRETCHEN GIOVANNA DE DIEGO CORNIER M.D. (NPI 1851824007) is an individual student in an organized health care education/training program in New York, New York and active in the NPI registry since April 2017. She is enrolled in Medicare PECOS, is affiliated with Upmc Altoona, and is a graduate of Loyola University Of Chicago, Stritch School Of Medicine (2017).
NPPES Registry Identity
Specialties & Licenses
Other Names 1
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 Giovanna De Diego Cornier 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 Reassignment
Medicare enrollment records show Gretchen De Diego Cornier reassigns Medicare billing to 1 organization. The organization bills Medicare for the services this provider delivers there.
Altoona, PA 16601
- Reassigned Medicare billing, Pennsylvania enrollment
- 17 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 2
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
Hospitals where this provider delivers care, identified from recent Medicare claims and place-of-service records.
Upmc Altoona
Acute Care Hospitals · Altoona, PAMedicare 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.
NEW YORK, NY 10019
NEW YORK, NY 10019
NEW YORK, NY 10019
NEW YORK, NY 10019
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 De Diego Cornier's NPI number?
The NPI number for Gretchen De Diego Cornier is 1851824007. It was assigned to this individual provider in the NPPES registry on April 5, 2017. The provider is also known as Gretchen Giovanna De Diego MD.
Where is Gretchen De Diego Cornier located?
Gretchen De Diego Cornier practices at 1000 10th Ave, New York, NY 10019. The listed phone number is (212) 523-4000.
What is Gretchen De Diego Cornier's specialty?
The primary specialty registered for this NPI is Student in an Organized Health Care Education/Training Program with taxonomy code 390200000X.
Is Gretchen De Diego Cornier enrolled in Medicare?
Yes. Gretchen De Diego Cornier 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 De Diego Cornier's services?
According to the CMS Revalidation Reassignment List (October 2026 release), Gretchen De Diego Cornier reassigns Medicare benefits to Pittsburgh Critical Care Associates, Inc (Altoona, PA). 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 De Diego Cornier's services. Reassignment records can lag staffing changes; confirm current arrangements with the organization.
Is Gretchen De Diego Cornier affiliated with any hospitals?
According to CMS data, Gretchen De Diego Cornier is affiliated with Upmc Altoona.
When was this NPI record last updated?
The NPPES record for Gretchen De Diego Cornier was last updated on August 25, 2026. NPI Profile syncs weekly with the NPPES registry data releases published by CMS. This NPI record was last updated 2 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 Giovanna De Diego Cornier, M.D. · NPI 1851824007
Student in an Organized Health Care Education/Training Program provider in New York, New York. Individual provider, active in the CMS NPPES registry since April 5, 2017.
## Identity
- **NPI:** 1851824007 (Entity type: Individual)
- **Enumerated:** April 5, 2017
- **Primary specialty:** Student in an Organized Health Care Education/Training Program · taxonomy 390200000X
- **Sole proprietor:** Yes
## Practice location
- **Address:** 1000 10TH AVE, New York, NY 10019-1147
- **Phone:** (212) 523-4000
## 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:** Pittsburgh Critical Care Associates, Inc (NPI 1497703680, Altoona, PA), under Medicare reassignment (form CMS-855R) · CMS Revalidation Reassignment List, October 2026 release
- **Medical school:** Loyola University Of Chicago, Stritch School Of Medicine, class of 2017
## Record status
- **NPPES last updated:** August 25, 2026
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Source: [NPI Profile](https://npiprofile.com/npi/1851824007) · Data from the CMS NPPES public registry.