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DR. ADAM ZACHARY TILLOWITZ MD
NPI 1245869510
Internal Medicine - Gastroenterology in Washington, DC

Active since April 07, 2020PECOS Enrolled
THE GW MEDICAL FACULTY ASSOCIATES, 2150 PENNSYLVANIA AVE, WASHINGTON, DC 20037(202) 741-3000 Get Directions Write a Review

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

Record update history: May 18, 2026, Apr 11, 2023, Apr 7, 2020 (3 updates tracked since 2020).

About Dr. Adam Zachary Tillowitz Md NPPES

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

DR. ADAM ZACHARY TILLOWITZ MD (NPI 1245869510) is an individual gastroenterology provider in Washington, District Of Columbia, licensed in Rhode Island (MD21210) and active in the NPI registry since April 2020. He is enrolled in Medicare PECOS, maintains a secondary practice location in Providence, and is a graduate of Albert Einstein College Of Medicine Of Yeshiva University (2020).

NPPES Registry Identity

NPI1245869510
Entity TypeIndividualMale
Primary Taxonomy207RG0100X
Provider Legal NameDR. ADAM ZACHARY TILLOWITZCredential: MD
Location AddressTHE GW MEDICAL FACULTY ASSOCIATES, 2150 PENNSYLVANIA AVEWashington, DC 20037
Mailing AddressPo Box 202230Dallas, TX 75320-2230 · (401) 421-8800
Phone(202) 741-3000
Sole ProprietorYes
Medical School CMSAlbert Einstein College Of Medicine Of Yeshiva UniversityGraduated 2020
Enumeration DateApril 7, 2020
Last NPPES UpdateMay 18, 20263 updates tracked since enumeration
NPPES CertifiedMay 18, 2026
✔ NPI 1245869510 is a valid, active identifier and passes the ISO check-digit test.

Specialties & Licenses

★ Primary SpecialtyInternal Medicine · GastroenterologyAllopathic & Osteopathic Physicians
Taxonomy Code207RG0100X
License✔ Licensed in RI · MD21210
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.
THE GW MEDICAL FACULTY ASSOCIATES, Washington, DC 20037
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Other Names 1

Former Name (1)Adam Zachary Horowitz

Secondary Practice Location 1

Location 144 W River StProvidence, RI 02904-2609 · Phone (401) 274-4800

Accepted Insurance

The full list of accepted plans is on the Insurance tab. Issuers include Taro Health.Insurance ›

Medicare Participation & PECOS CMS

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

Medicare Enrollment Status

✔

Enrolled in Medicare (PECOS)

Dr. Adam Zachary Tillowitz Md is registered in the CMS Provider Enrollment, Chain and Ownership System (PECOS).

PECOS PAC ID648740118
PECOS Enrollment IDI20260526002093
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 Adam Tillowitz reassigns Medicare billing to 1 organization. The organization bills Medicare for the services this provider delivers there.

University Gastroenterology, LLC
359 mi
Gastroenterology
33 STANIFORD ST
Providence, RI 02905
  • Reassigned Medicare billing, Rhode Island enrollment
  • 141 clinicians in this Medicare group
NPI 1386952612 (401) 421-8800

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 20037 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
$147.85 typical visit price
range $65.18 – $194.86
Typical copayment $36.96 (range $16.29 – $48.71)
Most-billed visit code 99204
Established Patient
$113.72 typical visit price
range $21.40 – $158.88
Typical copayment $28.43 (range $5.35 – $39.72)
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 16

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

ANDREW STEVEN BAEZ RIVERA
Student in an Organized Health Care Education/Training Program
THE GW MEDICAL FACULTY ASSOCIATES, 2150 PENNSYLVANIA AVE, NW
WASHINGTON, DC 20037
District of Columbia (202) 741-3000
MURWARIT RAHIMI
Student in an Organized Health Care Education/Training Program
THE GW MEDICAL FACULTY ASSOCIATES, 2150 PENNSYLVANIA AVENUE, NW
WASHINGTON, DC 20037
District of Columbia (202) 741-3000
NOHA ABDELGAWAD M.D
Student in an Organized Health Care Education/Training Program
THE GW MEDICAL FACULTY ASSOCIATES, 2150 PENNSYLVANIA AVENUE NW
WASHINGTON, DC 20037
District of Columbia (202) 741-3000
DOAA YAHYA ALQAIDY M.D
Student in an Organized Health Care Education/Training Program
THE GW MEDICAL FACULTY ASSOCIATES, 2150 PENNSYLVANIA AVENUE, NW
WASHINGTON, DC 20037
District of Columbia (202) 741-3000
MR. CHRISTIAN LUCAS GUINDI M.D.
Student in an Organized Health Care Education/Training Program
THE GW MEDICAL FACULTY ASSOCIATES, 2100 PENNSYLVANIA AVE. NW
WASHINGTON DC, DC 20037
District of Columbia (202) 741-3000
CAILE CRISCIONE
Student in an Organized Health Care Education/Training Program
THE GW MEDICAL FACULTY ASSOCIATES, 2150 PENNSYLVANIA AVENUE, NW
DC, DC 20037
District of Columbia (202) 741-3000
DR. TIMOTHY HUNT BATTER MD
Student in an Organized Health Care Education/Training Program
THE GW MEDICAL FACULTY ASSOCIATES, 2150 PENNSYLVANIA AVENUE, NW
WASHINGTON, DC 20037
District of Columbia (202) 741-3000
JENNIFER BECKERMAN MD
Internal Medicine (Hematology & Oncology)
THE GW MEDICAL FACULTY ASSOCIATES, 2150 PENNSYLVANIA AVENUE, NW
WASHINGTON, DC 20037
District of Columbia (202) 741-3000

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 Adam Tillowitz's NPI number?

The NPI number for Adam Tillowitz is 1245869510. It was assigned to this individual provider in the NPPES registry on April 7, 2020. The provider is also known as Adam Zachary Horowitz.

Where is Adam Tillowitz located?

Adam Tillowitz practices at The Gw Medical Faculty Associates 2150 Pennsylvania Ave, Washington, DC 20037. The listed phone number is (202) 741-3000.

What is Adam Tillowitz's specialty?

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

Is Adam Tillowitz enrolled in Medicare?

Yes. Adam Tillowitz is registered in the Medicare PECOS enrollment system.

Which organization bills Medicare for Adam Tillowitz's services?

According to the CMS Revalidation Reassignment List (October 2026 release), Adam Tillowitz reassigns Medicare benefits to University Gastroenterology, LLC (Providence, RI). 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 Adam Tillowitz's services. Reassignment records can lag staffing changes; confirm current arrangements with the organization.

What insurance does Adam Tillowitz accept?

Health plans from Taro Health list Adam Tillowitz 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 Adam Tillowitz was last updated on May 18, 2026. NPI Profile syncs weekly with the NPPES registry data releases published by CMS. This NPI record was last updated 5 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.