NPPES file of Aug 9, 2026

Gregory Duncan McCarroll, M.D.

Internal Medicine Physician · San Antonio, TX

Gregory Duncan McCarroll, M.D. is an internal medicine physician with a practice address in San Antonio, Texas, and NPI 1255422614, issued on Sep 28, 2006. Check the license (Texas G5351, as entered in NPPES) on the Texas Medical Board; the Medicare figures below come from public CMS files.

Record from CMS NPPES, file of Aug 9, 2026 · Medicare files 2024 · method · Verify with CMS →

NPPES recordNPPES file of Aug 9, 2026
1255422614
Name
Gregory Duncan McCarroll
Credential
M.D.
Primary taxonomy
Internal Medicine Physician 207R00000X
License number
G5351 TX
Self-reported in NPPES; status is on the state search
Practice location
7622 Louis Pasteur Dr, San Antonio, TX 78229
Phone
(210) 614-7840
Enumerated
Sep 28, 2006
Record last updated
Feb 21, 2018 (not updated in 8 years: call before relying on the address or phone)
Fax
(210) 614-6421
Medicare enrollment
Enrolled (PECOS I20100910000368); accepts Medicare assignment
Medical or professional school
University Of Texas Medical Branch At Galveston, 1983
Telehealth
Offers telehealth (CMS)
Entity
Type 1 · individual
Public record from CMS NPPES (open it on the CMS NPI Registry). Enrollment, assignment, school and telehealth: CMS Doctors and Clinicians file, Aug 2026. A record is not a license: verify it with the state board.
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8 nearest internal medicine physician records → All 9,175 in Texas → Look up another NPI →

Also registered at 7622 Louis Pasteur Dr

A shared address usually means a shared clinic or building; it does not show who employs whom.

  1. Christopher Arnold, MDFamily Medicine Physician1255338950
  2. Rosslyn Blake, GNP/FNPFamily Nurse Practitioner1427201722
  3. Patricia Chung, M.D.Family Medicine Physician1073503959
  4. Robin Eickhoff, MDFamily Medicine Physician1962474320
  5. Kimberly Garza, NPAdult Health Nurse Practitioner1851633119
  6. Amber Hoberg, PMHNP-BCPsychiatric/Mental Health Nurse Practitioner1003122532

Verify Gregory Duncan McCarroll in five checks

  1. 1IdentityNPI record in CMS NPPESNPI lookupConfirmed in NPPES
  2. 2LicenseActive license and public ordersTexas Medical Board
    Search for license G5351    Check the board
  3. 3Other statesLicenses and actions elsewhereDocInfo (FSMB)Not checked
  4. 4ExclusionsMedicare and Medicaid bansHHS-OIG exclusion listNot checked
  5. 5CertificationBoard certificationABMS AOA NCCPA AANPNot checked
Open the Texas license search

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3.0 times the Medicare Part D claims of the average internal medicine physician in 2024

9,538 Medicare Part D claims for 818 beneficiaries, against an average of 3,176 among the 108,855 providers of this specialty who prescribed in Part D. Brand-name drugs were 14% of claims. 329 claims were for opioids.

  1. Gregory McCarroll9,538
  2. Specialty average3,176

Most prescribed

  1. Atorvastatin Calcium584 claims
  2. Levothyroxine Sodium340 claims
  3. Lisinopril308 claims
  4. Hydrochlorothiazide287 claims
  5. Losartan Potassium286 claims
  6. Rosuvastatin Calcium266 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

  1. Wellmed Medical Group PASan Antonio, TX

Source: CMS Doctors and Clinicians National Downloadable File (the group practices a clinician bills Medicare through) (data.cms.gov).

Gregory Duncan McCarroll among 9,175 internal medicine physician records in Texas

Gregory Duncan McCarroll, M.D. 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 2006, is newer than 9% of them.

  • NPI issued2006 · 9% of these records are older, 59% newer
  • In a Medicare fileYes · 82% of these records are
  • In the CMS Doctors and Clinicians fileYes · 66% of these records are
  • Graduated1983 · median 2004 among the 6,088 with a school on file
  • Record last updated2018 · 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

  1. Jeremias Abueme, M.D.San Antonio, TX 782291891790960
  2. Richard Clemons, MDSan Antonio, TX 782291740282664
  3. Serina Flores, M.D.San Antonio, TX 782291528058203
  4. John Galan, MDSan Antonio, TX 782291528069440
  5. Juan Gonzalez, MDSan Antonio, TX 782291659370963
  6. Bradley Kayser, MDSan Antonio, TX 782291285635110
  7. Michelle Medellin, M.D.San Antonio, TX 782291770571614
  8. Thomas Mieras, MDSan Antonio, TX 782291578564787

Common questions

What is Gregory Duncan McCarroll, M.D.'s NPI number?

Gregory Duncan McCarroll, M.D.'s National Provider Identifier (NPI) is 1255422614, issued on Sep 28, 2006. An NPI identifies a provider in billing; it is not a license.

Where is Gregory Duncan McCarroll, M.D. located?

The NPPES record lists a practice address at 7622 Louis Pasteur Dr, San Antonio, TX, 78229. Phone: (210) 614-7840. Providers update this record themselves, so call before visiting.

How can I verify Gregory Duncan McCarroll, M.D.'s license?

NPPES lists Texas license number G5351, 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 Duncan McCarroll, M.D. prescribe under Medicare Part D?

In 2024, Gregory Duncan McCarroll, M.D. had 9,538 Medicare Part D claims for 818 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.

Written with AI tools from the named public files; every figure is computed from those files (how it is made).

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.