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Hematology/Oncology

Gregory J. Guzley, MD

Sees patients in Jacksonville, TX · San Antonio, TX · Texas

Summary

Gregory J. Guzley, MD (Hematology/Oncology) is enrolled with Medicare at 2 practice locations in Jacksonville, TX and San Antonio, TX. NPI 1427020114. Medicare data says the clinician accepts Medicare assignment. Source: CMS National Downloadable File, updated 2026-10-02.

Call(903) 586‑2456 NPI Registry record Medicare profile

From official Medicare data

This page shows what Medicare's official clinician data says about Gregory J. Guzley, joined by NPI number (data updated 2026-10-02). It is not a recommendation or a rating. Call the office or hospital to confirm before you go.

In a medical emergency, call 911.

At a glance

2Practice locations
Hematology/OncologyPrimary specialty
YesAccepts Medicare assignment
48Years since medical school (graduated 1978)
Baylor College Of MedicineMedical school
MaleGender (as listed)
Texas Oncology PAGroup practice

Quick answers

Where does Gregory J. Guzley see patients?
Medicare's clinician data lists 2 practice locations, including Jacksonville, TX and San Antonio, TX. Call before your visit to confirm the address.
What is Gregory J. Guzley's specialty?
Medicare lists Hematology/Oncology as the primary specialty, and also Internal Medicine and Medical Oncology.
Does Gregory J. Guzley accept Medicare assignment?
Yes. Medicare's clinician data says Gregory J. Guzley accepts Medicare assignment (the Medicare-approved amount as full payment for covered services), as of 2026-10-02. Ask the office to confirm before your visit.
What is the phone number for Gregory J. Guzley?
(903) 586-2456, as listed in official Medicare / NPI Registry data.
What is Gregory J. Guzley's NPI number?
1427020114. The NPI (National Provider Identifier) is the clinician's permanent federal ID; you can look it up in the official NPI Registry.

Practice locations

Addresses where Gregory J. Guzley is enrolled with Medicare (CMS data updated 2026-10-02).

Group practices

Medicare enrollment lists Gregory J. Guzley as a member of this group (CMS data updated 2026-10-02).

  • Texas Oncology PA1,014 clinicians in the group

Specialties

Find other Hematology/Oncology doctors in Texas →

Other hematologist-oncologists in Texas

Clinicians with the same Medicare primary specialty in Texas — not a recommendation.

All hematologist-oncologists in Texas →

Clinician information

CredentialMD
Medical schoolBaylor College Of Medicine
Graduation year1978
Gender (as listed)Male
Medicare assignmentAccepts (Medicare-approved amount as full payment)
NPI (National Provider Identifier)1427020114
CorrectionsReport an error or suggest an update →

Most corrections must be made at the source: clinicians update their NPI Registry record (NPPES) and their Medicare enrollment (PECOS); this page follows the next data release.

Sources

  1. National Downloadable File (Doctors and Clinicians) — CMS, data updated 2026-10-02, retrieved 2026-10-29
  2. NPI Registry — U.S. Department of Health and Human Services (NPPES), the clinician’s official record
  3. Medicare Care Compare — official Medicare tool to look up clinicians