JEFFREY R GRUEN MD
NPI 1598748709
Pediatrics - Neonatal-Perinatal Medicine in New Haven, CT

Q: What is Jeffrey Gruen's NPI number?

The NPI number for Jeffrey Gruen is 1598748709. It was assigned to this individual provider in the NPPES registry on November 22, 2005.

Q: What is Jeffrey Gruen's specialty?

The primary specialty registered for this NPI is Pediatrics, specializing in Neonatal-Perinatal Medicine, with taxonomy code 2080N0001X.

Q: When was this NPI record last updated?

The NPPES record for Jeffrey Gruen was last updated on July 7, 2008. NPI Profile syncs weekly with the NPPES registry data releases published by CMS. This NPI record was last updated 18 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.

Active since November 22, 2005PECOS Enrolled

20 YORK ST, YNHH (CHILDREN'S) WEST PAVILION - 2ND FLOOR, NEW HAVEN, CT 06504(203) 688-2320(203) 688-5426 Get Directions Write a Review

NPPES record last updated: July 7, 2008. Verified against the NPPES registry weekly; last sync: October 18, 2026.

On this page

About Jeffrey R Gruen Md NPPES

Official registry information on file with the National Plan and Provider Enumeration System.

JEFFREY R GRUEN MD (NPI 1598748709) is an individual neonatal-perinatal medicine provider in New Haven, Connecticut, licensed in Connecticut (025237) and active in the NPI registry since November 2005. He is enrolled in Medicare PECOS and is a graduate of Tulane University School Of Medicine (1981).

NPPES Registry Identity

NPI1598748709

Entity TypeIndividualMale

Primary Taxonomy2080N0001X

Provider Legal NameJEFFREY R GRUENCredential: MD

Location Address20 YORK ST, YNHH (CHILDREN'S) WEST PAVILION - 2ND FLOORNew Haven, CT 06504-8900

Mailing AddressPo Box 9805, 300 George St 6th FloorNew Haven, CT 06536-0805

Phone(203) 688-2320

Fax(203) 688-5426

Sole ProprietorNo

Medical School CMSTulane University School Of MedicineGraduated 1981

Enumeration DateNovember 22, 2005

Last NPPES UpdateJuly 7, 2008

✔ NPI 1598748709 is a valid, active identifier and passes the ISO check-digit test.

Specialties & Licenses

★ Primary SpecialtyPediatrics · Neonatal-Perinatal MedicineAllopathic & Osteopathic Physicians

Taxonomy Code2080N0001X

License✔ Licensed in CT · 025237

Definition

A pediatrician who is the principal care provider for sick newborn infants. Clinical expertise is used for direct patient care and for consulting with obstetrical colleagues to plan for the care of mothers who have high-risk pregnancies.

20 YORK ST, New Haven, CT 06504

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Other Identifiers 3

Medicare ID-Type Unspecified370000363CT

Medicare UPINE31739

Medicaid001252379CT

Medicare Participation & PECOS CMS

Medicare enrollment, assignment, billing reassignment, and ordering and referring status from CMS.

Medicare Enrollment Status

✔

Enrolled in Medicare (PECOS)

Jeffrey R Gruen Md is registered in the CMS Provider Enrollment, Chain and Ownership System (PECOS).

PECOS PAC ID2961531819

PECOS Enrollment IDI20250922002213

Eligible to Order & Refer✔ Part B Labs & Imaging✔ Durable Medical Equipment✔ Home Health Agency✔ Power Mobility DevicesPer the CMS Ordering and Referring file. Eligibility means Medicare pays claims that this provider orders or refers for these categories.

Medicare Billing Reassignment

Medicare enrollment records show Jeffrey Gruen reassigns Medicare billing to 1 organization. The organization bills Medicare for the services this provider delivers there.

Yale University

0.5 mi

Advanced Practice Midwife

100 CHURCH ST S STE 200, YALE SCHOOL OF NURSING
New Haven, CT 06519

Reassigned Medicare billing, Connecticut enrollment
3,728 clinicians in this Medicare group

NPI 1124148887 (203) 737-5432

Source: CMS Revalidation Reassignment List, October 2026 release. Reassignment records can lag staffing changes; confirm a current affiliation with the organization.

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.

MRS. MARY ANNE VAIL LCSW

Social Worker (Clinical)

20 YORK ST, YPH
NEW HAVEN, CT 06504

South Central Connecticut Planning Region (203) 688-9695

JUDIT FARKAS PA-C

Physician Assistant (Surgical)

20 YORK ST
NEW HAVEN, CT 06504

South Central Connecticut Planning Region (203) 688-2000

DR. LEONARD LOIS CALO MD

Hospitalist

20 YORK ST, YNH MEDICAL SERVICES PC - CB 2041
NEW HAVEN, CT 06504

South Central Connecticut Planning Region (203) 688-4748

DR. RICHARD RODION RATHBONE M.D.

Pathology (Clinical Pathology/Laboratory Medicine)

20 YORK ST, YALE-NEW HAVEN HOSPITAL
NEW HAVEN, CT 06504

South Central Connecticut Planning Region (203) 688-2439

DR. OLUKEMI AKANDE MD

Hospitalist

20 YORK ST, YNH MEDICAL SERVICES PC - CB 2041
NEW HAVEN, CT 06504

South Central Connecticut Planning Region (203) 688-4748

MARIE ELOISE EGAN MD

Pediatrics (Pediatric Pulmonology)

20 YORK ST, YNHH (CHILDREN'S) WEST PAVILION 2ND FLOOR
NEW HAVEN, CT 06504

South Central Connecticut Planning Region (203) 785-4081

MS. CAROL LYNN CESTARO LCSW

Social Worker (Clinical)

20 YORK ST, YPH LV-111
NEW HAVEN, CT 06504

South Central Connecticut Planning Region (203) 688-9867

SHEYLA SANTANA MARRANCA PA-C

Physician Assistant (Medical)

20 YORK ST, CB-2041 HOSPITALIST SERVICE
NEW HAVEN, CT 06504

South Central Connecticut Planning Region (203) 688-4748

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 Jeffrey Gruen's NPI number?

The NPI number for Jeffrey Gruen is 1598748709. It was assigned to this individual provider in the NPPES registry on November 22, 2005.

Where is Jeffrey Gruen located?

Jeffrey Gruen practices at 20 York St Ynhh (children's) West Pavilion - 2nd Floor, New Haven, CT 06504. The listed phone number is (203) 688-2320.

What is Jeffrey Gruen's specialty?

The primary specialty registered for this NPI is Pediatrics, specializing in Neonatal-Perinatal Medicine, with taxonomy code 2080N0001X.

Is Jeffrey Gruen enrolled in Medicare?

Yes. Jeffrey Gruen is registered in the Medicare PECOS enrollment system.

Which organization bills Medicare for Jeffrey Gruen's services?

According to the CMS Revalidation Reassignment List (October 2026 release), Jeffrey Gruen reassigns Medicare benefits to Yale University (New Haven, CT). 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 Jeffrey Gruen's services. Reassignment records can lag staffing changes; confirm current arrangements with the organization.

When was this NPI record last updated?

The NPPES record for Jeffrey Gruen was last updated on July 7, 2008. NPI Profile syncs weekly with the NPPES registry data releases published by CMS. This NPI record was last updated 18 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.