Gregory Anstead, MD
Infectious Disease Physician · San Antonio, TX
Gregory Anstead, MD is an infectious disease physician with a practice address in San Antonio, Texas, and NPI 1144337213, issued on Aug 24, 2006. Check the license (Texas K9989, as entered in NPPES) on the Texas Medical Board; the Medicare figures below come from public CMS files.
- Name
- Gregory Anstead
- Credential
- MD
- Primary taxonomy
- Infectious Disease Physician 207RI0200X
- License number
- K9989 TX
Self-reported in NPPES; status is on the state search - Practice location
- 4647 Medical Dr, San Antonio, TX 78229
- Phone
- (210) 257-1400
- Enumerated
- Aug 24, 2006
- Record last updated
- May 22, 2008 (not updated in 18 years: call before relying on the address or phone)
- Medicaid ID
- 045537001 TX
- Medicare enrollment
- Enrolled (PECOS I20100511000860); accepts Medicare assignment
- Entity
- Type 1 · individual
8 nearest infectious disease physician records → All 674 in Texas → Look up another NPI →
Also registered at 4647 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 Anstead in five checks
- 1IdentityNPI record in CMS NPPESNPI lookupConfirmed in NPPES
- 2LicenseActive license and public ordersTexas Medical Board
Search for license K9989Check the board - 3Other statesLicenses and actions elsewhereDocInfo (FSMB)Not checked
- 4ExclusionsMedicare and Medicaid bansHHS-OIG exclusion listNot checked
- 5CertificationBoard certificationABMS AOA NCCPA AANPNot checked
93% more Medicare Part D claims than the average infectious disease physician in 2024
1,331 Medicare Part D claims for 41 beneficiaries, against an average of 689 among the 7,388 providers of this specialty who prescribed in Part D. Brand-name drugs were 35% of claims. 168 claims were for opioids.
Most prescribed
- Hydrocodone-Acetaminophen137 claims
- Dovato129 claims
- Biktarvy70 claims
- Atorvastatin Calcium49 claims
- Prezcobix33 claims
- Tamsulosin Hcl33 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.
Industry payments in 2024: $16,168.39
15 payments; by number, the most common kind was food and beverage; the largest payer was Gilead Sciences, Inc. The 3,895 providers of this specialty with any payment received $4,362.19 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.
Bills Medicare through one group practice
- University OF Texas Health Science Center AT San AntonioSan Antonio, TX
Source: CMS Doctors and Clinicians National Downloadable File (the group practices a clinician bills Medicare through) (data.cms.gov).
Gregory Anstead among 674 infectious disease physician records in Texas
Gregory Anstead, MD is one of 674 infectious disease physician records with a practice address in Texas. 84% 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, 59% newer
- In a Medicare fileYes · 84% of these records are
- In the CMS Doctors and Clinicians fileYes · 76% of these records are
- Graduated1993 · median 2002 among the 510 with a school on file
- Record last updated2008 · 46% of these records were not updated in five years or more
Source: CMS NPPES, file of Aug 9, 2026, every record with primary taxonomy 207RI0200X and a Texas practice address; Medicare files: CMS Part D Prescribers 2024, MIPS 2023, Open Payments 2024, Doctors and Clinicians (data.cms.gov).
Infectious Disease Physician providers in Texas
There are 674 infectious disease physician records in Texas.
All 674 in Texas → Every provider in San Antonio → Infectious Disease Physician nationwide →
The 8 infectious disease physician records with the nearest ZIP codes
- Sunil Ahuja, MDSan Antonio, TX 782291417064585
- Carl Berkowitz, MDSan Antonio, TX 782291124018163
- Robert Clark, MDSan Antonio, TX 782291174630156
- George Crawford, MDSan Antonio, TX 782291417064494
- John Graybill, MDSan Antonio, TX 782291710094875
- Anthony Hartzler, M.D.San Antonio, TX 782291548460314
- Jeffrey Jones, M.D.San Antonio, TX 782291003934647
- Aaron Owens, M.D.San Antonio, TX 782291578574364
Common questions
What is Gregory Anstead, MD's NPI number?
Gregory Anstead, MD's National Provider Identifier (NPI) is 1144337213, issued on Aug 24, 2006. An NPI identifies a provider in billing; it is not a license.
Where is Gregory Anstead, MD located?
The NPPES record lists a practice address at 4647 Medical Dr, San Antonio, TX, 78229. Phone: (210) 257-1400. Providers update this record themselves, so call before visiting.
How can I verify Gregory Anstead, MD's license?
NPPES lists Texas license number K9989, 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 Anstead, MD prescribe under Medicare Part D?
In 2024, Gregory Anstead, MD had 1,331 Medicare Part D claims for 41 beneficiaries; the average among infectious disease physician prescribers was 689. 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.