GREGORY PATRICK JOHNSTON MD
NPI 1154958486
Radiology - Vascular & Interventional Radiology in Chicago, IL

Q: What is Gregory Johnston's NPI number?

The NPI number for Gregory Johnston is 1154958486. It was assigned to this individual provider in the NPPES registry on March 25, 2020.

Q: What is Gregory Johnston's specialty?

The primary specialty registered for this NPI is Radiology, specializing in Vascular & Interventional Radiology, with taxonomy code 2085R0204X.

Q: When was this NPI record last updated?

The NPPES record for Gregory Johnston was last updated on July 1, 2025. NPI Profile syncs weekly with the NPPES registry data releases published by CMS. This NPI record was last updated 16 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.

Active since March 25, 2020PECOS Enrolled

251 E HURON ST, CHICAGO, IL 60611(312) 926-2000 Get Directions Write a Review

NPPES record last updated: July 1, 2025. Verified against the NPPES registry weekly; last sync: November 01, 2026.

Record update history: Jul 1, 2025, Mar 25, 2020 (2 updates tracked since 2020).

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About Gregory Patrick Johnston Md NPPES

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

GREGORY PATRICK JOHNSTON MD (NPI 1154958486) is an individual vascular & interventional radiology provider in Chicago, Illinois, licensed in Illinois (125.085128) and active in the NPI registry since March 2020. He is enrolled in Medicare PECOS.

NPPES Registry Identity

NPI1154958486

Entity TypeIndividualMale

Primary Taxonomy2085R0204X

Provider Legal NameGREGORY PATRICK JOHNSTONCredential: MD

Location Address251 E HURON STChicago, IL 60611-2908

Mailing Address423 E Ohio St Unit 205Chicago, IL 60611-3050 · (321) 297-9360

Phone(312) 926-2000

Sole ProprietorYes

Enumeration DateMarch 25, 2020

Last NPPES UpdateJuly 1, 20252 updates tracked since enumeration

NPPES CertifiedJuly 1, 2025

✔ NPI 1154958486 is a valid, active identifier and passes the ISO check-digit test.

Specialties & Licenses 2

★ Primary SpecialtyRadiology · Vascular & Interventional RadiologyAllopathic & Osteopathic Physicians

Taxonomy Code2085R0204X

License✔ Licensed in IL · 125.085128

Definition

A radiologist who diagnoses and treats diseases by various radiologic imaging modalities. These include fluoroscopy, digital radiography, computed tomography, sonography and magnetic resonance imaging.

Also ListedStudent in an Organized Health Care Education/Training ProgramTaxonomy 390200000X

251 E HURON ST, Chicago, IL 60611

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Medicare Participation & PECOS CMS

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

Medicare Enrollment Status

✔

Enrolled in Medicare (PECOS)

Gregory Patrick Johnston 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 Gregory Johnston reassigns Medicare billing to 1 organization. The organization bills Medicare for the services this provider delivers there.

Utah Imaging Associates Inc

1,259 mi

Diagnostic Radiology

1433 N 1075 W STE 104
Farmington, UT 84025

Reassigned Medicare billing, Utah enrollment
39 clinicians in this Medicare group

NPI 1629076229 (801) 298-1300

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 60611 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

$94.06 typical visit price

range $60.08 – $183.39

Typical copayment $23.51 (range $15.02 – $45.84)

Most-billed visit code 99203

Established Patient

$74.80 typical visit price

range $18.97 – $148.12

Typical copayment $18.70 (range $4.74 – $37.03)

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.

MARK WANG M.D.

Pathology (Anatomic Pathology & Clinical Pathology)

251 E HURON ST, FEINBERG PAVILION
CHICAGO, IL 60611

Cook County (312) 503-8144

DR. MARLEY ANN DOYLE M/D.

Psychiatry & Neurology (Psychiatry)

251 E HURON ST, GALTER 3-150, C
CHICAGO, IL 60611

Cook County (312) 926-6895

CASSIDY SCHWAB MD

Anesthesiology