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Recently Updated NPI Information — some details in this NPI profile have been updated in the NPI registry within the last 60 days.

DR. MATTHEW J ELLIS MD PHD
NPI 1669495685
Internal Medicine - Medical Oncology in Houston, TX

Active since July 25, 2006
6620 MAIN ST, SUITE 1350, HOUSTON, TX 77030(713) 798-1999(713) 798-1990 Get Directions Write a Review

NPPES record last updated: September 29, 2026. Verified against the NPPES registry weekly; last sync: October 25, 2026.

About Dr. Matthew J Ellis Md Phd NPPES

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

DR. MATTHEW J ELLIS MD PHD (NPI 1669495685) is an individual medical oncology provider in Houston, Texas, licensed in Texas (Q2126) and active in the NPI registry since July 2006.

NPPES Registry Identity

NPI1669495685
Entity TypeIndividualMale
Primary Taxonomy207RX0202X
Provider Legal NameDR. MATTHEW J ELLISCredential: MD PHD
Location Address6620 MAIN ST, SUITE 1350Houston, TX 77030-2348
Mailing Address1 Baylor Plz, Bcm 600Houston, TX 77030-3411 · (713) 798-1847 · Fax (713) 798-1642
Phone(713) 798-1999
Fax(713) 798-1990
Sole ProprietorNo
Enumeration DateJuly 25, 2006
Last NPPES UpdateSeptember 29, 2026
✔ NPI 1669495685 is a valid, active identifier and passes the ISO check-digit test.

Specialties & Licenses

★ Primary SpecialtyInternal Medicine · Medical OncologyAllopathic & Osteopathic Physicians
Taxonomy Code207RX0202X
License✔ Licensed in TX · Q2126
Definition
An internist who specializes in the diagnosis and treatment of all types of cancer and other benign and malignant tumors. This specialist decides on and administers therapy for these malignancies as well as consults with surgeons and radiotherapists on other treatments for cancer.
6620 MAIN ST, Houston, TX 77030
Open in Google Maps ↗

Other Identifiers 1

Medicaid904430183MO

Medicare Participation & PECOS CMS

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

Medicare Enrollment Status

✔

Enrolled in Medicare (PECOS)

Dr. Matthew J Ellis Md Phd is registered in the CMS Provider Enrollment, Chain and Ownership System (PECOS).

Medicare Billing Reassignments

2

Medicare enrollment records show Matthew Ellis reassigns Medicare billing to 2 organizations. Each organization bills Medicare for the services this provider delivers there; the nearest is listed first.

Baylor College Of Medicine
Same address
Internal Medicine
6620 MAIN ST
Houston, TX 77030
  • Reassigned Medicare billing, Texas enrollment
  • 2,296 clinicians in this Medicare group
NPI 1104867175 (713) 798-2500
Baylor College Of Medicine
0.9 mi
Medical Genetics, Ph.D. Medical Genetics
7200 CAMBRIDGE ST FL 10
Houston, TX 77030
  • Reassigned Medicare billing, Texas enrollment
  • 2,554 clinicians in this Medicare group
NPI 1881026664 (713) 798-0000

Source: CMS Revalidation Reassignment List, October 2026 release. Reassignment records can lag staffing changes; confirm a current affiliation with the organization.

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.

DR. SRIKANTH KONERU M.D., CARDIOLOGY
Internal Medicine (Cardiovascular Disease)
6620 MAIN ST
HOUSTON, TX 77030
Harris County (713) 798-1000
BAYLOR COLLEGE OF MEDICINE
Orthopaedic Surgery
6620 MAIN ST, SUITE 1325
HOUSTON, TX 77030
Harris County (713) 986-6024
GUILHERME GODOY MD
Urology
6620 MAIN ST, SUITE 1325, MS BCM380
HOUSTON, TX 77030
Harris County (713) 798-5628
KJERSTI MARIE AAGAARD-TILLERY MD
Obstetrics & Gynecology (Maternal & Fetal Medicine)
6620 MAIN ST, SUITE 1450
HOUSTON, TX 77030
Harris County (713) 798-7500
DR. RONALD TIMOTHY COTTON MD
Transplant Surgery
6620 MAIN ST, SUITE 1450
HOUSTON, TX 77030
Harris County (832) 355-1400
DR. MARCUS K HOFFMAN MD
Surgery (Surgical Critical Care)
6620 MAIN ST, SUITE 1350
HOUSTON, TX 77030
Harris County (713) 798-2262
JOHN M. VIERLING MD
Internal Medicine (Gastroenterology)
6620 MAIN ST
HOUSTON, TX 77030
Harris County (713) 798-2500
SHAWN SPENCER GROTH M.D.
Thoracic Surgery (Cardiothoracic Vascular Surgery)
6620 MAIN ST, BAYLOR CLINIC 1325
HOUSTON, TX 77030
Harris County (713) 798-6376

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 Matthew Ellis's NPI number?

The NPI number for Matthew Ellis is 1669495685. It was assigned to this individual provider in the NPPES registry on July 25, 2006.

Where is Matthew Ellis located?

Matthew Ellis practices at 6620 Main St Suite 1350, Houston, TX 77030. The listed phone number is (713) 798-1999.

What is Matthew Ellis's specialty?

The primary specialty registered for this NPI is Internal Medicine, specializing in Medical Oncology, with taxonomy code 207RX0202X.

Is Matthew Ellis enrolled in Medicare?

Yes. Matthew Ellis is registered in the Medicare PECOS enrollment system.

Which organizations bill Medicare for Matthew Ellis's services?

According to the CMS Revalidation Reassignment List (October 2026 release), Matthew Ellis reassigns Medicare benefits to 2 organizations: Baylor College Of Medicine (Houston, TX) and Baylor College Of Medicine (Houston, TX). Each 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 Matthew Ellis's services. Reassignment records can lag staffing changes; confirm current arrangements with the organization.

When was this NPI record last updated?

The NPPES record for Matthew Ellis was last updated on September 29, 2026. NPI Profile syncs weekly with the NPPES registry data releases published by CMS. This NPI record was last updated 29 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.