Gregory J. Guzley, MD
Hematology & Oncology Physician · San Antonio, TX
Gregory J. Guzley, MD is a hematology & oncology physician with a practice address in San Antonio, Texas, and NPI 1427020114, issued on Feb 6, 2006. Check the license (Texas F1613, as entered in NPPES) on the Texas Medical Board; the Medicare figures below come from public CMS files.
- Name
- Gregory J. Guzley
- Credential
- MD
- Primary taxonomy
- Hematology & Oncology Physician 207RH0003X
- License number
- F1613 TX
Self-reported in NPPES; status is on the state search - Practice location
- 4411 Medical Dr, San Antonio, TX 78229
- Phone
- (210) 595-5300
- Enumerated
- Feb 6, 2006
- Record last updated
- Jan 28, 2016 (not updated in 10 years: call before relying on the address or phone)
- Fax
- (210) 614-8740
- Medicaid IDs
- 116715701 TX
116715705 TX
116715704 TX - Entity
- Type 1 · individual
8 nearest hematology & oncology physician records → All 922 in Texas → Look up another NPI →
Also registered at 4411 Medical Dr
A shared address usually means a shared clinic or building; it does not show who employs whom.
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Verify Gregory J. Guzley in five checks
- 1IdentityNPI record in CMS NPPESNPI lookupConfirmed in NPPES
- 2LicenseActive license and public ordersTexas Medical Board
Search for license F1613Check the board - 3Other statesLicenses and actions elsewhereDocInfo (FSMB)Not checked
- 4ExclusionsMedicare and Medicaid bansHHS-OIG exclusion listNot checked
- 5CertificationBoard certificationABMS AOA NCCPA AANPNot checked
84% fewer Medicare Part D claims than the average hematology & oncology physician in 2024
139 Medicare Part D claims for 60 beneficiaries, against an average of 877 among the 10,784 providers of this specialty who prescribed in Part D. Brand-name drugs were 32% of claims.
Most prescribed
- Xarelto22 claims
- Anastrozole17 claims
- Warfarin Sodium15 claims
- Potassium Chloride11 claims
Source: CMS Medicare Part D Prescribers by Provider and Drug, 2024 (data.cms.gov). Part D covers prescriptions for Medicare patients only; drugs with fewer than 11 claims are not published.
The MIPS final score for 2023 (Medicare payment program): 89.4 of 100
The Merit-based Incentive Payment System score is reported for this clinician. Four categories are weighted into the final score; the average among 454,083 clinicians with a measured score was 83.5.
Source: CMS Quality Payment Program, MIPS performance year 2023; category weights for 2023 (qpp.cms.gov).
Industry payments in 2024: $30.00
1 payment: education; the largest payer was Alexion Pharmaceuticals, Inc. The 8,560 providers of this specialty with any payment received $7,481.41 on average. Payments are reported by manufacturers, not by the provider, and are not a sign of wrongdoing.
Source: CMS Open Payments, program year 2024 (openpaymentsdata.cms.gov); average among providers of this specialty with at least one payment.
Gregory J. Guzley among 922 hematology & oncology physician records in Texas
Gregory J. Guzley, MD is one of 922 hematology & oncology physician records with a practice address in Texas. 87% of them appear in a Medicare file (Part D prescribing, MIPS, Open Payments or Medicare group billing); this one does. Its NPI, issued in 2006, is newer than 7% of them.
- NPI issued2006 · 7% of these records are older, 57% newer
- In a Medicare fileYes · 87% of these records are
- In the CMS Doctors and Clinicians fileNo · 75% of these records are
- Record last updated2016 · 51% of these records were not updated in five years or more
Source: CMS NPPES, file of Aug 9, 2026, every record with primary taxonomy 207RH0003X and a Texas practice address; Medicare files: CMS Part D Prescribers 2024, MIPS 2023, Open Payments 2024, Doctors and Clinicians (data.cms.gov).
Hematology & Oncology Physician providers in Texas
There are 922 hematology & oncology physician records in Texas.
All 922 in Texas → Every provider in San Antonio → Hematology & Oncology Physician nationwide →
The 8 hematology & oncology physician records with the nearest ZIP codes
- Georg Aue, MDSan Antonio, TX 782291215928080
- David Boldt, M.D.San Antonio, TX 782291447253042
- Jose Cruz, MDSan Antonio, TX 782291720043524
- Sreedevi Daggubati, MDSan Antonio, TX 782291952373656
- Timothy Fenske, MDSan Antonio, TX 782291104877935
- Francis Giles, M.D.San Antonio, TX 782291750480950
- David Haile, MDSan Antonio, TX 782291700993862
- Steven Kalter, M.D.San Antonio, TX 782291922032218
Common questions
What is Gregory J. Guzley, MD's NPI number?
Gregory J. Guzley, MD's National Provider Identifier (NPI) is 1427020114, issued on Feb 6, 2006. An NPI identifies a provider in billing; it is not a license.
Where is Gregory J. Guzley, MD located?
The NPPES record lists a practice address at 4411 Medical Dr, San Antonio, TX, 78229. Phone: (210) 595-5300. Providers update this record themselves, so call before visiting.
How can I verify Gregory J. Guzley, MD's license?
NPPES lists Texas license number F1613, as entered by the provider. Search the Texas Medical Board at https://profile.tmb.state.tx.us/Search.aspx. The NPPES record confirms identity only; the state search shows license status, expiration and public orders.
How much does Gregory J. Guzley, MD prescribe under Medicare Part D?
In 2024, Gregory J. Guzley, MD had 139 Medicare Part D claims for 60 beneficiaries; the average among hematology & oncology physician prescribers was 877. Part D covers Medicare prescriptions only.
What is Gregory J. Guzley, MD's MIPS final score?
The 2023 MIPS final score is 89.4 of 100. The average among 454,083 clinicians with a measured score was 83.5.
Source: CMS National Plan and Provider Enumeration System (NPPES), file of Aug 9, 2026 (NPPES files on CMS.gov); NUCC Health Care Provider Taxonomy. Medicare files from data.cms.gov. An NPI identifies who bills; it is not a license.
Figures on PlainDoctor are read from the federal files each page names (CMS NPPES, Medicare Part D, MIPS, Open Payments; the HHS-OIG exclusion list only as counts) and from Census population estimates, with the file date shown beside them. See our editorial standards & corrections policy, the methodology behind these numbers, or report a data error. Data current as of Aug 9, 2026.