Jeffrey R. Gruen, MD
Neonatal-Perinatal Medicine Physician · New Haven, CT
Jeffrey R. Gruen, MD is a neonatal-perinatal medicine physician with a practice address in New Haven, Connecticut, and NPI 1598748709, issued on Nov 22, 2005. Check the license (Connecticut 025237, as entered in NPPES) on the Connecticut Medical Examining Board; the Medicare figures below come from public CMS files.
- Name
- Jeffrey R. Gruen
- Credential
- MD
- Primary taxonomy
- Neonatal-Perinatal Medicine Physician 2080N0001X
- License number
- 025237 CT
Self-reported in NPPES; status is on the state search - Practice location
- 20 York St, New Haven, CT 06504
- Phone
- (203) 688-2320
- Enumerated
- Nov 22, 2005
- Record last updated
- Jul 7, 2008 (not updated in 18 years: call before relying on the address or phone)
- Fax
- (203) 688-5426
- Medicaid ID
- 001252379 CT
- Medicare enrollment
- Enrolled (PECOS I20250922002213); accepts Medicare assignment
- Medical or professional school
- Tulane University School Of Medicine, 1981
- Entity
- Type 1 · individual
8 nearest neonatal-perinatal medicine physician records → All 108 in Connecticut → Look up another NPI →
Also registered at 20 York St
A shared address usually means a shared clinic or building; it does not show who employs whom.
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- Thomas Balcezak, MDInternal Medicine Physician1487661229
- Leonard Calo, MDHospitalist Physician1033305545
- Carol Cestaro, LCSWClinical Social Worker1114972569
- Christine Chen, M.D.Hospitalist Physician1134189707
- Keun Chung, MDPain Medicine (Anesthesiology) Physician1821073107
Verify Jeffrey R. Gruen in five checks
- 1IdentityNPI record in CMS NPPESNPI lookupConfirmed in NPPES
- 2LicenseActive license and public ordersConnecticut Medical Examining Board
Search for license 025237Check the board - 3Other statesLicenses and actions elsewhereDocInfo (FSMB)Not checked
- 4ExclusionsMedicare and Medicaid bansHHS-OIG exclusion listNot checked
- 5CertificationBoard certificationABMS AOA NCCPA AANPNot checked
Bills Medicare through one group practice
- Yale UniversityNew Haven, CT
Source: CMS Doctors and Clinicians National Downloadable File (the group practices a clinician bills Medicare through) (data.cms.gov).
Jeffrey R. Gruen among 108 neonatal-perinatal medicine physician records in Connecticut
Jeffrey R. Gruen, MD is one of 108 neonatal-perinatal medicine physician records with a practice address in Connecticut. 13% of them appear in a Medicare file (Part D prescribing, MIPS, Open Payments or Medicare group billing); this one does. Its NPI, issued in 2005, is newer than 0% of them.
- NPI issued2005 · 0% of these records are older, 76% newer
- In a Medicare fileYes · 13% of these records are
- In the CMS Doctors and Clinicians fileYes · 7% of these records are
- Record last updated2008 · 44% of these records were not updated in five years or more
Source: CMS NPPES, file of Aug 9, 2026, every record with primary taxonomy 2080N0001X and a Connecticut practice address; Medicare files: CMS Part D Prescribers 2024, MIPS 2023, Open Payments 2024, Doctors and Clinicians (data.cms.gov).
Neonatal-Perinatal Medicine Physician providers in Connecticut
There are 108 neonatal-perinatal medicine physician records in Connecticut.
All 108 in Connecticut → Every provider in New Haven → Neonatal-Perinatal Medicine Physician nationwide →
The 8 neonatal-perinatal medicine physician records with the nearest ZIP codes
- Catherine Buck, MDNew Haven, CT 065041437425402
- Rosa Carrasco Sanchez, MDNew Haven, CT 065041326240599
- Cassandra Demartino, M.D.New Haven, CT 065041902268287
- Matthew Drago, MDNew Haven, CT 065041225322456
- Zaneta Forson-DareNew Haven, CT 065041982050829
- Ian Gross, MDNew Haven, CT 065041467435685
- Jacob McPadden, M.D.New Haven, CT 065041780946715
- Michael Reisfeld, MDNew Haven, CT 065041679077994
Common questions
What is Jeffrey R. Gruen, MD's NPI number?
Jeffrey R. Gruen, MD's National Provider Identifier (NPI) is 1598748709, issued on Nov 22, 2005. An NPI identifies a provider in billing; it is not a license.
Where is Jeffrey R. Gruen, MD located?
The NPPES record lists a practice address at 20 York St, New Haven, CT, 06504. Phone: (203) 688-2320. Providers update this record themselves, so call before visiting.
How can I verify Jeffrey R. Gruen, MD's license?
NPPES lists Connecticut license number 025237, as entered by the provider. Search the Connecticut Medical Examining Board at https://www.elicense.ct.gov/Lookup/LicenseLookup.aspx. The NPPES record confirms identity only; the state search shows license status, expiration and public orders.
Source: CMS National Plan and Provider Enumeration System (NPPES), file of Aug 9, 2026 (NPPES files on CMS.gov); NUCC Health Care Provider Taxonomy. Medicare files from data.cms.gov. An NPI identifies who bills; it is not a license.
Figures on PlainDoctor are read from the federal files each page names (CMS NPPES, Medicare Part D, MIPS, Open Payments; the HHS-OIG exclusion list only as counts) and from Census population estimates, with the file date shown beside them. See our editorial standards & corrections policy, the methodology behind these numbers, or report a data error. Data current as of Aug 9, 2026.