Ann Marie Stephenson Thomas, D.O.
NPI 1376742601 · Gastroenterology Physician · Rockville, MD
Enrolled with Medicare as Practitioner - Gastroenterology · source: CMS PECOS Public Provider Enrollment (2026.04.01)
Ann Marie Stephenson Thomas, D.O. is a Gastroenterology Physician provider in Rockville, MD (NPI 1376742601).
Provider details
- NPI number
- 1376742601
- Entity type
- Individual
- Primary specialty
- Gastroenterology PhysicianAllopathic & Osteopathic Physicians
- Credential
- D.O.
- Sex
- Female
- Sole proprietor
- No
- License
- 25MB08301600 (NJ)
Specialties & taxonomies
Allopathic & Osteopathic Physicians
Profile Score
A profile completeness & documented-activity index — NOT a quality, outcomes, or patient-satisfaction rating.
- Registry tenure25% of score
18 yrs in NPPES registry
- Profile completeness25% of score
100% of core fields populated
- Practice footprint15% of score
1 documented practice location
- Medicare service volume (vs. specialty peers)25% of score
455 Medicare services, 2024 (ranked within specialty)
- Open Payments transparency10% of score
Has Open Payments disclosures (2024)
Medicare volume is ranked against active providers in the same specialty. Signals a provider has no public data for (e.g. Medicare claims) are left out of the score entirely — never counted as zero — so providers without that data are not penalized. See the full formula and weights in our .
What this provider does (Medicare)
Based on Medicare fee-for-service claims, 2024; not all care is captured.
| Service (HCPCS) | Medicare services | Typical Medicare-allowed (2024) |
|---|---|---|
| Biopsy of Large Bowel Using a Flexible Endoscope45380 | 94 | $183 |
| Established Patient Office Or Other Outpatient Visit With Low Level OD Decision Making, If Using Time, 20 Minutes Or More99213 | 93 | $99 |
| Biopsy of Esophagus, Stomach, And/Or Upper Small Bowel Using a Flexible Endoscope43239 | 74 | $103 |
| Established Patient Office Or Other Outpatient Visit With Moderate Level of Decision Making, If Using Time, 30 Minutes Or More99214 | 74 | $138 |
| New Patient Office Or Other Outpatient Visit With Low Level of Medical Decision Making, If Using Time, 30 Minutes Or More99203 | 54 | $123 |
| New Patient Office Or Other Outpatient Visit With Moderate Level of Medical Decision Making, If Using Time, 45 Minutes Or More |
What this provider prescribes (Medicare Part D)
Top drugs by Medicare Part D claim volume, 2024 · 9 distinct drugs on file.
| Drug | Part D claims (2024) | Beneficiaries |
|---|---|---|
| Omeprazole | 98 | 41 |
| Famotidine | 94 | 46 |
| Sod Picosulf/Mag Ox/Citric Acbrand: Clenpiq | 42 | 42 |
| Sodium, Potassium,mag Sulfatesbrand: Sod Sulf-Potass Sulf-Mag Sulf | 41 | 40 |
| Linaclotidebrand: Linzess | 19 | — |
| Sucralfate | 14 | — |
| Pantoprazole Sodium | 14 |
Transparency — industry payments
Based on CMS Open Payments, 2024; not all care is captured.
$986 across 56 records (Open Payments 2024)
Open Payments discloses payments and transfers of value (meals, travel, consulting, research, royalties) from drug and device makers to providers. This is a transparency signal, not a verdict — such payments are legal and common, and their presence is neither an endorsement nor a criticism. Source: CMS Open Payments, program year 2024.
Practice location
Mailing address
Registry dates
- Enumerated
- 2007-07-17
- Last updated
- 2019-01-24
Frequently asked questions
- What is Ann Marie Stephenson Thomas's NPI number?
- Ann Marie Stephenson Thomas's National Provider Identifier (NPI) is 1376742601, a unique 10-digit ID issued by CMS for use in standard healthcare transactions.
- What is Ann Marie Stephenson Thomas's specialty?
- Ann Marie Stephenson Thomas is listed in the NPPES registry with a primary specialty of Gastroenterology Physician (Allopathic & Osteopathic Physicians).
- Where is Ann Marie Stephenson Thomas located?
- Ann Marie Stephenson Thomas's practice location on file with NPPES is 9420 Key West Avenue, Rockville, MD 20850.
- What is Ann Marie Stephenson Thomas's phone number?
- The practice phone number listed in the NPPES registry for Ann Marie Stephenson Thomas is (301) 251-9555.
- Does Ann Marie Stephenson Thomas accept Medicare?
- Ann Marie Stephenson Thomas is approved to bill Medicare according to CMS PECOS enrollment data (2026.04.01). Confirm current participation with the provider before scheduling.
- Is Ann Marie Stephenson Thomas's NPI active?
- Yes — Ann Marie Stephenson Thomas's NPI (1376742601) is active in the NPPES registry as of the last update on 2019-01-24.
Source: CMS NPPES Data Dissemination (June 2026). NPI Central is not affiliated with CMS. Data is provided as-is from the public registry.