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RONALD JAMES GATHAGAN II MD
NPI 1013590108
Radiology - Diagnostic Radiology in New Haven, CT

Active since May 05, 2021PECOS Enrolled
20 YORK ST, NEW HAVEN, CT 06510(203) 688-4242 Get Directions Write a Review

NPPES record last updated: June 10, 2026. Verified against the NPPES registry weekly; last sync: October 25, 2026.

About Ronald James Gathagan Ii Md NPPES

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

RONALD JAMES GATHAGAN II MD (NPI 1013590108) is an individual diagnostic radiology provider in New Haven, Connecticut, licensed in Connecticut (85351) and active in the NPI registry since May 2021. He is enrolled in Medicare PECOS.

NPPES Registry Identity

NPI1013590108
Entity TypeIndividualMale
Primary Taxonomy2085R0202X
Provider Legal NameRONALD JAMES GATHAGAN IICredential: MD
Location Address20 YORK STNew Haven, CT 06510-3220
Mailing Address20 York StNew Haven, CT 06510-3220 · (203) 688-2433 · Fax (203) 688-3858
Phone(203) 688-4242
Sole ProprietorNo
Enumeration DateMay 5, 2021
Last NPPES UpdateJune 10, 2026
NPPES CertifiedJune 10, 2026
✔ NPI 1013590108 is a valid, active identifier and passes the ISO check-digit test.

Specialties & Licenses

★ Primary SpecialtyRadiology · Diagnostic RadiologyAllopathic & Osteopathic Physicians
Taxonomy Code2085R0202X
License✔ Licensed in CT · 85351
Definition
A radiologist who utilizes x-ray, radionuclides, ultrasound and electromagnetic radiation to diagnose and treat disease.
20 YORK ST, New Haven, CT 06510
Open in Google Maps ↗

Accepted Insurance

The full list of accepted plans is on the Insurance tab. Issuers include Anthem Blue Cross and Blue Shield.Insurance ›

Medicare Participation & PECOS CMS

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

Medicare Enrollment Status

✔

Enrolled in Medicare (PECOS)

Ronald James Gathagan Ii Md is registered in the CMS Provider Enrollment, Chain and Ownership System (PECOS).

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 Ronald Gathagan reassigns Medicare billing to 1 organization. The organization bills Medicare for the services this provider delivers there.

Yale University
0.4 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.

Physician Visit Costs CMS claims · ZIP area

Typical Medicare office-visit costs in the 06510 ZIP code area, from fee-for-service claims. These are area statistics, not this provider’s prices; actual charges vary by service and coverage.

New Patient
$93.86 typical visit price
range $60.82 – $183.10
Typical copayment $23.46 (range $15.20 – $45.77)
Most-billed visit code 99203
Established Patient
$75.55 typical visit price
range $19.76 – $149.26
Typical copayment $18.88 (range $4.94 – $37.31)
Most-billed visit code 99213
Amounts reflect what Medicare beneficiaries in this ZIP area are typically charged for office visits. Patients with other coverage should check their individual plans.

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.

AUDREY P SENIOR APRN
Nurse Practitioner (Family)
20 YORK ST
NEW HAVEN, CT 06510
South Central Connecticut Planning Region (203) 688-5860
DR. YEISID F FIGUEREDO M.D.
Pediatrics (Neonatal-Perinatal Medicine)
20 YORK ST, DEPT OF NEONATOLOGY
NEW HAVEN, CT 06510
South Central Connecticut Planning Region (203) 688-2320
YALE NEW HAVEN HOSPITAL
Durable Medical Equipment & Medical Supplies (Customized Equipment)
20 YORK ST
NEW HAVEN, CT 06510
South Central Connecticut Planning Region (203) 688-2046
TAYLOR KINGSTON
Dietitian, Registered
20 YORK ST, FOOD AND NUTRITION EPB806
NEW HAVEN, CT 06510
South Central Connecticut Planning Region (203) 688-9185
DR. TRAVIS DANIEL BONTRAGER MD
Hospitalist
20 YORK ST
NEW HAVEN, CT 06510
South Central Connecticut Planning Region (203) 688-1734
TERESA JOSEPH D.O.
Internal Medicine (Nephrology)
20 YORK ST
NEW HAVEN, CT 06510
South Central Connecticut Planning Region (203) 737-8894
MR. BRAD ST. MARTIN MD
Obstetrics & Gynecology
20 YORK ST
NEW HAVEN, CT 06510
South Central Connecticut Planning Region (203) 688-4242
BERNADETTE BIMONTE-HACKETT LCSW
Social Worker (Clinical)
20 YORK ST, SOCIAL WORK EP10-635
NEW HAVEN, CT 06510
South Central Connecticut Planning Region (203) 785-5161

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 Ronald Gathagan's NPI number?

The NPI number for Ronald Gathagan is 1013590108. It was assigned to this individual provider in the NPPES registry on May 5, 2021.

Where is Ronald Gathagan located?

Ronald Gathagan practices at 20 York St, New Haven, CT 06510. The listed phone number is (203) 688-4242.

What is Ronald Gathagan's specialty?

The primary specialty registered for this NPI is Radiology, specializing in Diagnostic Radiology, with taxonomy code 2085R0202X.

Is Ronald Gathagan enrolled in Medicare?

Yes. Ronald Gathagan is registered in the Medicare PECOS enrollment system.

Which organization bills Medicare for Ronald Gathagan's services?

According to the CMS Revalidation Reassignment List (October 2026 release), Ronald Gathagan 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 Ronald Gathagan's services. Reassignment records can lag staffing changes; confirm current arrangements with the organization.

What insurance does Ronald Gathagan accept?

Health plans from Anthem Blue Cross and Blue Shield list Ronald Gathagan 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 Ronald Gathagan was last updated on June 10, 2026. NPI Profile syncs weekly with the NPPES registry data releases published by CMS. This NPI record was last updated 4 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.