Mary Marshall
NPI 1336502822 · Gastroenterology Physician · Mobile, AL
Enrolled with Medicare as Practitioner - Internal Medicine · source: CMS PECOS Public Provider Enrollment (2026.04.01)
Mary Marshall is a Gastroenterology Physician provider in Mobile, AL (NPI 1336502822).
Provider details
- NPI number
- 1336502822
- Entity type
- Individual
- Primary specialty
- Gastroenterology PhysicianAllopathic & Osteopathic Physicians
- Sex
- Female
- Sole proprietor
- No
- License
- 36662 (AL)
Specialties & taxonomies
Allopathic & Osteopathic Physicians
Allopathic & Osteopathic Physicians
Profile Score
A profile completeness & documented-activity index — NOT a quality, outcomes, or patient-satisfaction rating.
- Registry tenure25% of score
10 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
338 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) |
|---|---|---|
| Established Patient Office Or Other Outpatient Visit With Moderate Level of Decision Making, If Using Time, 30 Minutes Or More99214 | 120 | $89 |
| Subsequent Hospital Care With Moderate Levelof Medical Decision Making, If Using Time, at Least 35 Minutes99232 | 64 | $68 |
| Biopsy of Esophagus, Stomach, And/Or Upper Small Bowel Using a Flexible Endoscope43239 | 43 | $66 |
| New Patient Office Or Other Outpatient Visit With Moderate Level of Medical Decision Making, If Using Time, 45 Minutes Or More99204 | 39 | $122 |
| Removal of Polyps Or Growths of Large Bowel Using an Endoscope With Mechanical Snare45385 | 31 | $228 |
What this provider prescribes (Medicare Part D)
Top drugs by Medicare Part D claim volume, 2024 · 13 distinct drugs on file.
| Drug | Part D claims (2024) | Beneficiaries |
|---|---|---|
| Pantoprazole Sodium | 111 | 28 |
| Omeprazole | 108 | 39 |
| Famotidine | 98 | 30 |
| Sodium, Potassium,mag Sulfatesbrand: Sod Sulf-Potass Sulf-Mag Sulf | 70 | 64 |
| Linaclotidebrand: Linzess | 52 | 14 |
| Plecanatidebrand: Trulance | 41 | — |
| Dicyclomine Hcl | 27 |
Transparency — industry payments
Based on CMS Open Payments, 2024; not all care is captured.
$970 across 52 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
- 2016-04-01
- Last updated
- 2022-06-17
- Certified
- 2022-06-17
Frequently asked questions
- What is Mary Marshall's NPI number?
- Mary Marshall's National Provider Identifier (NPI) is 1336502822, a unique 10-digit ID issued by CMS for use in standard healthcare transactions.
- What is Mary Marshall's specialty?
- Mary Marshall is listed in the NPPES registry with a primary specialty of Gastroenterology Physician (Allopathic & Osteopathic Physicians).
- Where is Mary Marshall located?
- Mary Marshall's practice location on file with NPPES is 75 S University Blvd Unit 6000, Mobile, AL 36608-3274.
- What is Mary Marshall's phone number?
- The practice phone number listed in the NPPES registry for Mary Marshall is (251) 660-5555.
- Does Mary Marshall accept Medicare?
- Mary Marshall is approved to bill Medicare according to CMS PECOS enrollment data (2026.04.01). Confirm current participation with the provider before scheduling.
- Is Mary Marshall's NPI active?
- Yes — Mary Marshall's NPI (1336502822) is active in the NPPES registry as of the last update on 2022-06-17.
Source: CMS NPPES Data Dissemination (June 2026). NPI Central is not affiliated with CMS. Data is provided as-is from the public registry.