Addison Grant Marshall
Physician Assistant · San Antonio, TX
Addison Grant Marshall is a physician assistant with a practice address in San Antonio, Texas, and NPI 1366911265, issued on Nov 20, 2018. Check the license (Texas PA12539, as entered in NPPES) with the Texas board that licenses this profession; the Medicare figures below come from public CMS files.
- Name
- Addison Grant Marshall
- Primary taxonomy
- Physician Assistant 363A00000X
- License number
- PA12539 TX
Self-reported in NPPES; status is on the state search - Practice location
- 4502 Medical Dr, San Antonio, TX 78229
- Phone
- (210) 358-4000
- Enumerated
- Nov 20, 2018
- Record last updated
- May 24, 2019 (not updated in 7 years: call before relying on the address or phone)
- Medicaid ID
- 396471001 TX
- Medicare enrollment
- Enrolled (PECOS I20190418002218); accepts Medicare assignment
- Telehealth
- Offers telehealth (CMS)
- Entity
- Type 1 · individual
8 nearest physician assistant records → All 10,999 in Texas → Look up another NPI →
Also registered at 4502 Medical Dr
A shared address usually means a shared clinic or building; it does not show who employs whom.
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- Jordan Abel, M.D.Infectious Disease Physician1417273301
- Aesha Aboueisha, MDHospitalist Physician1225527815
- Seena Abraham, MDFamily Medicine Physician1306338561
Verify Addison Grant Marshall in five checks
- 1IdentityNPI record in CMS NPPESNPI lookupConfirmed in NPPES
- 2LicenseActive license and public ordersWhich Texas board licenses this profession
Search for license PA12539Check the board - 3Other statesLicenses and actions elsewhereDocInfo (FSMB)Not checked
- 4ExclusionsMedicare and Medicaid bansHHS-OIG exclusion listNot checked
- 5CertificationBoard certificationABMS AOA NCCPA AANPNot checked
16% more Medicare Part D claims than the average physician assistant in 2024
964 Medicare Part D claims for 233 beneficiaries, against an average of 830 among the 101,058 providers of this specialty who prescribed in Part D. Brand-name drugs were 2% of claims. 155 claims were for opioids.
Most prescribed
- Gabapentin187 claims
- Tramadol Hcl112 claims
- Pregabalin94 claims
- Tizanidine Hcl92 claims
- Cyclobenzaprine Hcl55 claims
- Meloxicam53 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: $318.59
10 payments; by number, the most common kind was food and beverage; the largest payer was Boston Scientific Corporation. The 64,719 providers of this specialty with any payment received $841.65 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
- William A. Tisdall, M.D., P.A.San Antonio, TX
Source: CMS Doctors and Clinicians National Downloadable File (the group practices a clinician bills Medicare through) (data.cms.gov).
Addison Grant Marshall among 10,999 physician assistant records in Texas
Addison Grant Marshall is one of 10,999 physician assistant records with a practice address in Texas. 74% of them appear in a Medicare file (Part D prescribing, MIPS, Open Payments or Medicare group billing); this one does. Its NPI, issued in 2018, is newer than 55% of them.
- NPI issued2018 · 55% of these records are older, 40% newer
- In a Medicare fileYes · 74% of these records are
- In the CMS Doctors and Clinicians fileYes · 55% of these records are
- Graduated2018 · median 2017 among the 6,096 with a school on file
- Record last updated2019 · 40% of these records were not updated in five years or more
Source: CMS NPPES, file of Aug 9, 2026, every record with primary taxonomy 363A00000X and a Texas practice address; Medicare files: CMS Part D Prescribers 2024, MIPS 2023, Open Payments 2024, Doctors and Clinicians (data.cms.gov).
873 physician assistant records list a practice address in San Antonio
They are 873 of the 37,749 NPPES records with a practice address in San Antonio, and 10,999 physician assistant records in Texas.
All 10,999 in Texas → Every provider in San Antonio → Physician Assistant nationwide →
The 8 physician assistant records with the nearest ZIP codes
- Christa Black, PA-CSan Antonio, TX 782291033177837
- Leticia Bland, PA-CSan Antonio, TX 782291659356178
- Karen Burchell, PA-CSan Antonio, TX 782291992772503
- John Curran, PASan Antonio, TX 782291174583892
- Sara Dungan, PA-CSan Antonio, TX 782291518917319
- Melinda Ellis, PA-CSan Antonio, TX 782291710954581
- Stanley Oatman, P.A-CSan Antonio, TX 782291215982434
- Stephanie Philipp, PACSan Antonio, TX 782291881662757
Common questions
What is Addison Grant Marshall's NPI number?
Addison Grant Marshall's National Provider Identifier (NPI) is 1366911265, issued on Nov 20, 2018. An NPI identifies a provider in billing; it is not a license.
Where is Addison Grant Marshall located?
The NPPES record lists a practice address at 4502 Medical Dr, San Antonio, TX, 78229. Phone: (210) 358-4000. Providers update this record themselves, so call before visiting.
How can I verify Addison Grant Marshall's license?
NPPES lists Texas license number PA12539, as entered by the provider. Search the Texas board that licenses this profession; the NPPES record confirms identity only.
How much does Addison Grant Marshall prescribe under Medicare Part D?
In 2024, Addison Grant Marshall had 964 Medicare Part D claims for 233 beneficiaries; the average among physician assistant prescribers was 830. 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.