Ann Marie Stephenson Thomas, D.O.
Gastroenterology Physician · Rockville, MD
Ann Marie Stephenson Thomas, D.O. is a gastroenterology physician with a practice address in Rockville, Maryland, and NPI 1376742601, issued on Jul 17, 2007. Check the license on the Maryland Board of Physicians; the Medicare figures below come from public CMS files.
- Name
- Ann Marie Stephenson Thomas
- Credential
- D.O.
- Primary taxonomy
- Gastroenterology Physician 207RG0100X
- License number
- 25MB08301600 NJ
Self-reported in NPPES; status is on the state search - Practice location
- 9420 Key West Avenue, Rockville, MD 20850
- Phone
- (301) 251-9555
- Enumerated
- Jul 17, 2007
- Record last updated
- Jan 24, 2019 (not updated in 7 years: call before relying on the address or phone)
- Fax
- (301) 309-0765
- Medicare enrollment
- Enrolled (PECOS I20140402001871); accepts Medicare assignment
- Medical or professional school
- Philadelphia College Of Osteopathic Medicine, 2003
- Telehealth
- Offers telehealth (CMS)
- Entity
- Type 1 · individual
8 nearest gastroenterology physician records → All 505 in Maryland → Look up another NPI →
Also registered at 9420 Key West Avenue
A shared address usually means a shared clinic or building; it does not show who employs whom.
- Karin Fice, OTR/L, CHTOccupational Therapist1396898508
- Jennifer Gillott, M.S.P.T.Physical Therapist1336227586
- Shira Spilman, PA-CPhysician Assistant1699920124
- Patricia Wiedeman-Stone, Pt, P.T.Physical Therapist1114078144
Verify Ann Marie Stephenson Thomas in five checks
- 1IdentityNPI record in CMS NPPESNPI lookupConfirmed in NPPES
- 2LicenseActive license and public ordersMaryland Board of PhysiciansCheck the board
- 3Other statesLicenses and actions elsewhereDocInfo (FSMB)Not checked
- 4ExclusionsMedicare and Medicaid bansHHS-OIG exclusion listNot checked
- 5CertificationBoard certificationABMS AOA NCCPA AANPNot checked
43% fewer Medicare Part D claims than the average gastroenterology physician in 2024
459 Medicare Part D claims for 201 beneficiaries, against an average of 811 among the 16,445 providers of this specialty who prescribed in Part D. Brand-name drugs were 22% of claims.
Most prescribed
- Omeprazole98 claims
- Famotidine94 claims
- Clenpiq42 claims
- Sod Sulf-Potass Sulf-Mag Sulf41 claims
- Linzess19 claims
- Pantoprazole Sodium14 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: $986.20
56 payments; by number, the most common kind was food and beverage; the largest payer was Takeda Pharmaceuticals U.S.A., Inc. The 13,350 providers of this specialty with any payment received $5,015.95 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
- Capital Digestive Care LLCRockville, MD
Source: CMS Doctors and Clinicians National Downloadable File (the group practices a clinician bills Medicare through) (data.cms.gov).
Ann Marie Stephenson Thomas among 505 gastroenterology physician records in Maryland
Ann Marie Stephenson Thomas, D.O. is one of 505 gastroenterology physician records with a practice address in Maryland. 81% 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 54% of them.
- NPI issued2007 · 54% of these records are older, 36% newer
- In a Medicare fileYes · 81% of these records are
- In the CMS Doctors and Clinicians fileYes · 68% of these records are
- Graduated2003 · median 2002 among the 344 with a school on file
- Record last updated2019 · 61% of these records were not updated in five years or more
Source: CMS NPPES, file of Aug 9, 2026, every record with primary taxonomy 207RG0100X and a Maryland practice address; Medicare files: CMS Part D Prescribers 2024, MIPS 2023, Open Payments 2024, Doctors and Clinicians (data.cms.gov).
Gastroenterology Physician providers in Maryland
There are 505 gastroenterology physician records in Maryland.
All 505 in Maryland → Every provider in Rockville → Gastroenterology Physician nationwide →
The 8 gastroenterology physician records with the nearest ZIP codes
- Lawrence Bassin, MDRockville, MD 208501215921473
- Mark Birns, M.D.Rockville, MD 208501982692828
- Robert Eisdorfer, MDRockville, MD 208501891789046
- Elizabeth Gantt, MDRockville, MD 208501619973963
- Mark Gloger, M.D.Rockville, MD 208501295723146
- Ghanshyam Gupta, M.DRockville, MD 208501619089000
- Neil Julie, M.D.Rockville, MD 208501578661054
- Julia Korenman, MDRockville, MD 208501780678946
Common questions
What is Ann Marie Stephenson Thomas, D.O.'s NPI number?
Ann Marie Stephenson Thomas, D.O.'s National Provider Identifier (NPI) is 1376742601, issued on Jul 17, 2007. An NPI identifies a provider in billing; it is not a license.
Where is Ann Marie Stephenson Thomas, D.O. located?
The NPPES record lists a practice address at 9420 Key West Avenue, Rockville, MD, 20850. Phone: (301) 251-9555. Providers update this record themselves, so call before visiting.
How can I verify Ann Marie Stephenson Thomas, D.O.'s license?
Search the Maryland Board of Physicians at https://www.mbp.state.md.us/. The NPPES record confirms identity only; the state search shows license status, expiration and public orders.
How much does Ann Marie Stephenson Thomas, D.O. prescribe under Medicare Part D?
In 2024, Ann Marie Stephenson Thomas, D.O. had 459 Medicare Part D claims for 201 beneficiaries; the average among gastroenterology physician prescribers was 811. 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.