1. Home
  2. Directory
  3. Connecticut
  4. Norwalk
  5. Internal Medicine
  6. NPI Profile
Recently Updated NPI Information — some details in this NPI profile have been updated in the NPI registry within the last 60 days.

DR. TRISTON WIHELM GABRIEL BERGER MD
NPI 1124657515
Internal Medicine - Gastroenterology in Norwalk, CT

Active since April 07, 2020PECOS Enrolled
NORWALK HOSPITAL, 34 MAPLE STREET, NORWALK, CT 06856(203) 852-2025(203) 899-5224 Get Directions Write a Review

NPPES record last updated: August 10, 2026. Verified against the NPPES registry weekly; last sync: September 13, 2026.

Record update history: Aug 10, 2026, Aug 27, 2020, Apr 7, 2020 (3 updates tracked since 2020).

About Dr. Triston Wihelm Gabriel Berger Md NPPES

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

DR. TRISTON WIHELM GABRIEL BERGER MD (NPI 1124657515) is an individual gastroenterology provider in Norwalk, Connecticut, licensed in Minnesota (82339) and active in the NPI registry since April 2020. He is enrolled in Medicare PECOS and maintains a secondary practice location in Duluth.

NPPES Registry Identity

NPI1124657515
Entity TypeIndividualMale
Primary Taxonomy207RG0100X
Provider Legal NameDR. TRISTON WIHELM GABRIEL BERGERCredential: MD
Location AddressNORWALK HOSPITAL, 34 MAPLE STREETNorwalk, CT 06856-3815
Mailing Address400 E 3rd StDuluth, MN 55805-1951 · (218) 786-8364
Phone(203) 852-2025
Fax(203) 899-5224
Sole ProprietorNo
Enumeration DateApril 7, 2020
Last NPPES UpdateAugust 10, 20263 updates tracked since enumeration
NPPES CertifiedAugust 10, 2026
✔ NPI 1124657515 is a valid, active identifier and passes the ISO check-digit test.

Specialties & Licenses 2

★ Primary SpecialtyInternal Medicine · GastroenterologyAllopathic & Osteopathic Physicians
Taxonomy Code207RG0100X
License✔ Licensed in MN · 82339
Definition
An internist who specializes in diagnosis and treatment of diseases of the digestive organs including the stomach, bowels, liver and gallbladder. This specialist treats conditions such as abdominal pain, ulcers, diarrhea, cancer and jaundice and performs complex diagnostic and therapeutic procedures using endoscopes to visualize internal organs.
Also ListedInternal MedicineTaxonomy 207R00000X · License 82339 (MN)
NORWALK HOSPITAL, Norwalk, CT 06856
Open in Google Maps ↗

Secondary Practice Location 1

Location 1420 E 1st StDuluth, MN 55805-1901 · Phone (218) 786-8364

Medicare Participation & PECOS CMS

Medicare enrollment, assignment, and ordering and referring status from the CMS PECOS system.

Medicare Enrollment Status

✔

Enrolled in Medicare (PECOS)

Dr. Triston Wihelm Gabriel Berger 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.

Physician Visit Costs CMS claims · ZIP area

Typical Medicare office-visit costs in the 06856 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
$138.84 typical visit price
range $60.82 – $183.10
Typical copayment $34.71 (range $15.20 – $45.77)
Most-billed visit code 99204
Established Patient
$106.68 typical visit price
range $19.76 – $149.26
Typical copayment $26.67 (range $4.94 – $37.31)
Most-billed visit code 99214
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 5

Providers registered at the same practice address, or within the immediate area, according to the NPPES registry.

MUHSINA MOUSHUMI MD
Student in an Organized Health Care Education/Training Program
NORWALK HOSPITAL, 34 MAPLE STREET
NOWALK, CT 06856
Western Connecticut Planning Region (203) 852-2025
MR. AMIT SINGH JATANA MD
Student in an Organized Health Care Education/Training Program
NORWALK HOSPITAL, 34 MAPLE STREET
NORWALK, CT 06856
Western Connecticut Planning Region (203) 852-2025
NANA AFUA AKYAA ADDO M.D
Hospitalist
NORWALK HOSPITAL, 34 MAPLE STREET
NORWALK, CT 06856
Western Connecticut Planning Region (203) 852-2025
THOMAS WOODS PA-C
Physician Assistant
NORWALK HOSPITAL, STEVENS STR
NORWALK, CT 06856
Western Connecticut Planning Region (203) 855-2000
MS. GISELLE SACHA VOLNEY
Student in an Organized Health Care Education/Training Program
NORWALK HOSPITAL, 34 MAPLE STREET
NORWALK, CT 06856
Western Connecticut Planning Region (203) 852-2025

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 Triston Berger's NPI number?

The NPI number for Triston Berger is 1124657515. It was assigned to this individual provider in the NPPES registry on April 7, 2020.

Where is Triston Berger located?

Triston Berger practices at Norwalk Hospital 34 Maple Street, Norwalk, CT 06856. The listed phone number is (203) 852-2025.

What is Triston Berger's specialty?

The primary specialty registered for this NPI is Internal Medicine, specializing in Gastroenterology, with taxonomy code 207RG0100X.

Is Triston Berger enrolled in Medicare?

Yes. Triston Berger is registered in the Medicare PECOS enrollment system.

When was this NPI record last updated?

The NPPES record for Triston Berger was last updated on August 10, 2026. NPI Profile syncs weekly with the NPPES registry data releases published by CMS. This NPI record was last updated 38 days 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.