Brian Michael Kanatzar, D.O.
Internal Medicine Physician · San Antonio, TX
Brian Michael Kanatzar, D.O. is an internal medicine physician with a practice address in San Antonio, Texas, and NPI 1093033243, issued on May 12, 2010. Check the license (Texas N5753, as entered in NPPES) on the Texas Medical Board; the Medicare figures below come from public CMS files.
- Name
- Brian Michael Kanatzar
- Credential
- D.O.
- Primary taxonomy
- Internal Medicine Physician 207R00000X
- License number
- N5753 TX
Self-reported in NPPES; status is on the state search - Practice location
- 4330 Medical Dr, San Antonio, TX 78229
- Phone
- (210) 576-5306
- Enumerated
- May 12, 2010
- Record last updated
- Sep 26, 2024
- Fax
- (210) 694-0645
- Medicare enrollment
- Enrolled (PECOS I20110104001291); accepts Medicare assignment
- Entity
- Type 1 · individual
8 nearest internal medicine physician records → All 9,175 in Texas → Look up another NPI →
Also registered at 4330 Medical Dr
A shared address usually means a shared clinic or building; it does not show who employs whom.
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Verify Brian Michael Kanatzar in five checks
- 1IdentityNPI record in CMS NPPESNPI lookupConfirmed in NPPES
- 2LicenseActive license and public ordersTexas Medical Board
Search for license N5753Check the board - 3Other statesLicenses and actions elsewhereDocInfo (FSMB)Not checked
- 4ExclusionsMedicare and Medicaid bansHHS-OIG exclusion listNot checked
- 5CertificationBoard certificationABMS AOA NCCPA AANPNot checked
87% fewer Medicare Part D claims than the average internal medicine physician in 2024
411 Medicare Part D claims for 211 beneficiaries, against an average of 3,176 among the 108,855 providers of this specialty who prescribed in Part D. Brand-name drugs were 9% of claims. 45 claims were for opioids.
Most prescribed
- Hydrocodone-Acetaminophen34 claims
- Prednisone21 claims
- Amoxicillin-Clavulanate Potass19 claims
- Pantoprazole Sodium15 claims
- Clopidogrel14 claims
- Ondansetron Hcl11 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.
Bills Medicare through one group practice
- Wellmed Networks, Inc.San Antonio, TX
Source: CMS Doctors and Clinicians National Downloadable File (the group practices a clinician bills Medicare through) (data.cms.gov).
Brian Michael Kanatzar among 9,175 internal medicine physician records in Texas
Brian Michael Kanatzar, D.O. is one of 9,175 internal medicine physician records with a practice address in Texas. 82% of them appear in a Medicare file (Part D prescribing, MIPS, Open Payments or Medicare group billing); this one does. Its NPI, issued in 2010, is newer than 58% of them.
- NPI issued2010 · 58% of these records are older, 40% newer
- In a Medicare fileYes · 82% of these records are
- In the CMS Doctors and Clinicians fileYes · 66% of these records are
- Graduated2008 · median 2004 among the 6,088 with a school on file
- Record last updated2024 · 49% of these records were not updated in five years or more
Source: CMS NPPES, file of Aug 9, 2026, every record with primary taxonomy 207R00000X and a Texas practice address; Medicare files: CMS Part D Prescribers 2024, MIPS 2023, Open Payments 2024, Doctors and Clinicians (data.cms.gov).
657 internal medicine physician records list a practice address in San Antonio
They are 657 of the 37,749 NPPES records with a practice address in San Antonio, and 9,175 internal medicine physician records in Texas.
All 9,175 in Texas → Every provider in San Antonio → Internal Medicine Physician nationwide →
The 8 internal medicine physician records with the nearest ZIP codes
- Jeremias Abueme, M.D.San Antonio, TX 782291891790960
- Richard Clemons, MDSan Antonio, TX 782291740282664
- Serina Flores, M.D.San Antonio, TX 782291528058203
- John Galan, MDSan Antonio, TX 782291528069440
- Juan Gonzalez, MDSan Antonio, TX 782291659370963
- Bradley Kayser, MDSan Antonio, TX 782291285635110
- Michelle Medellin, M.D.San Antonio, TX 782291770571614
- Thomas Mieras, MDSan Antonio, TX 782291578564787
Common questions
What is Brian Michael Kanatzar, D.O.'s NPI number?
Brian Michael Kanatzar, D.O.'s National Provider Identifier (NPI) is 1093033243, issued on May 12, 2010. An NPI identifies a provider in billing; it is not a license.
Where is Brian Michael Kanatzar, D.O. located?
The NPPES record lists a practice address at 4330 Medical Dr, San Antonio, TX, 78229. Phone: (210) 576-5306. Providers update this record themselves, so call before visiting.
How can I verify Brian Michael Kanatzar, D.O.'s license?
NPPES lists Texas license number N5753, 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 Brian Michael Kanatzar, D.O. prescribe under Medicare Part D?
In 2024, Brian Michael Kanatzar, D.O. had 411 Medicare Part D claims for 211 beneficiaries; the average among internal medicine physician prescribers was 3,176. Part D covers Medicare prescriptions only.
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.