Thomas S. Parker, M.D.
Internal Medicine Physician · San Marcos, TX
Thomas S. Parker, M.D. is an internal medicine physician with a practice address in San Marcos, Texas, and NPI 1962558056, issued on Jan 25, 2007. Check the license (Texas F1884, as entered in NPPES) on the Texas Medical Board; the Medicare figures below come from public CMS files.
- Name
- Thomas S. Parker
- Credential
- M.D.
- Primary taxonomy
- Internal Medicine Physician 207R00000X
- License number
- F1884 TX
Self-reported in NPPES; status is on the state search - Practice location
- 1301 Wonder World Dr, San Marcos, TX 78666
- Phone
- (512) 353-8979
- Enumerated
- Jan 25, 2007
- Record last updated
- Aug 23, 2024
- Entity
- Type 1 · individual
8 nearest internal medicine physician records → All 9,175 in Texas → Look up another NPI →
Also registered at 1301 Wonder World Dr
A shared address usually means a shared clinic or building; it does not show who employs whom.
- Jaime Acosta, CSFASurgical Assistant1922972694
- Raka Amin, MDInternal Medicine Physician1437576493
- Jose Ayala, MDInternal Medicine Physician1114960663
- Chad Benninghoff, NPFamily Nurse Practitioner1912256256
- Shyra BerishSpeech-Language Pathologist1235656364
- Jessica Best, MDEmergency Medicine Physician1679833354
Verify Thomas S. Parker in five checks
- 1IdentityNPI record in CMS NPPESNPI lookupConfirmed in NPPES
- 2LicenseActive license and public ordersTexas Medical Board
Search for license F1884Check the board - 3Other statesLicenses and actions elsewhereDocInfo (FSMB)Not checked
- 4ExclusionsMedicare and Medicaid bansHHS-OIG exclusion listNot checked
- 5CertificationBoard certificationABMS AOA NCCPA AANPNot checked
100% fewer Medicare Part D claims than the average internal medicine physician in 2024
11 Medicare Part D claims, against an average of 3,176 among the 108,855 providers of this specialty who prescribed in Part D.
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.
Thomas S. Parker among 9,175 internal medicine physician records in Texas
Thomas S. Parker, 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 2007, is newer than 41% of them.
- NPI issued2007 · 41% of these records are older, 50% newer
- In a Medicare fileYes · 82% of these records are
- In the CMS Doctors and Clinicians fileNo · 66% of these records are
- 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).
13 internal medicine physician records list a practice address in San Marcos
They are 13 of the 1,003 NPPES records with a practice address in San Marcos, and 9,175 internal medicine physician records in Texas.
All 9,175 in Texas → Every provider in San Marcos → Internal Medicine Physician nationwide →
The 8 internal medicine physician records with the nearest ZIP codes
- Raka Amin, MDSan Marcos, TX 786661437576493
- Jose Ayala, MDSan Marcos, TX 786661114960663
- Larry Beville, NPSan Marcos, TX 786661770897498
- Emilio Carranco, M.D.San Marcos, TX 786661730341660
- Donna Dolan, MDSan Marcos, TX 786661831134824
- Rubin Harris, MDSan Marcos, TX 786661386619765
- Gregory Moore, MDSan Marcos, TX 786661417958760
- Cody Nichols, M.D.San Marcos, TX 786661295766038
Common questions
What is Thomas S. Parker, M.D.'s NPI number?
Thomas S. Parker, M.D.'s National Provider Identifier (NPI) is 1962558056, issued on Jan 25, 2007. An NPI identifies a provider in billing; it is not a license.
Where is Thomas S. Parker, M.D. located?
The NPPES record lists a practice address at 1301 Wonder World Dr, San Marcos, TX, 78666. Phone: (512) 353-8979. Providers update this record themselves, so call before visiting.
How can I verify Thomas S. Parker, M.D.'s license?
NPPES lists Texas license number F1884, 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 Thomas S. Parker, M.D. prescribe under Medicare Part D?
In 2024, Thomas S. Parker, M.D. had 11 Medicare Part D claims; 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.