Andrew Marshall, M.D.
NPI 1801846290 · Gastroenterology Physician · Hewlett, NY
Enrolled with Medicare as Practitioner - Internal Medicine · source: CMS PECOS Public Provider Enrollment (2026.04.01)
Andrew Marshall, M.D. is a Gastroenterology Physician provider in Hewlett, NY (NPI 1801846290).
Provider details
- NPI number
- 1801846290
- Entity type
- Individual
- Primary specialty
- Gastroenterology PhysicianAllopathic & Osteopathic Physicians
- Credential
- M.D.
- Sex
- Male
- Sole proprietor
- Yes
- License
- 193405 (NY)
Specialties & taxonomies
Allopathic & Osteopathic Physicians
Profile Score
A profile completeness & documented-activity index — NOT a quality, outcomes, or patient-satisfaction rating.
- Registry tenure28% of score
20 yrs in NPPES registry
- Profile completeness28% of score
100% of core fields populated
- Practice footprint17% of score
1 documented practice location
- Medicare service volume (vs. specialty peers)28% of score
3,383 Medicare services, 2024 (ranked within specialty)
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 methodology.
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) |
|---|---|---|
| Insertion of Needle Into Vein for Collection of Blood Sample36415 | 410 | $9 |
| Visit Complexity Inherent to Evaluation and Management Associated With Medical Care Services That Serve As the Continuing Focal Point for All Needed Health Care Services And/Or With Medical Care Services That Are Part of Ongoing Care Related to a Patient'SG2211 | 396 | $18 |
| Established Patient Office Or Other Outpatient Visit With Moderate Level of Decision Making, If Using Time, 30 Minutes Or More99214 | 391 | $146 |
| Established Patient Office Or Other Outpatient Visit With Low Level OD Decision Making, If Using Time, 20 Minutes Or More99213 | 282 | $104 |
| Blood Test, Comprehensive Group of Blood Chemicals80053 | 270 | $10 |
| Blood Test, Lipids (cholesterol and Triglycerides) |
What this provider prescribes (Medicare Part D)
Top drugs by Medicare Part D claim volume, 2024 · 33 distinct drugs on file.
| Drug | Part D claims (2024) | Beneficiaries |
|---|---|---|
| Atorvastatin Calcium | 368 | 105 |
| Omeprazole | 154 | 52 |
| Amlodipine Besylate | 136 | 43 |
| Simvastatin | 111 | 29 |
| Losartan Potassium | 93 | 22 |
| Sodium, Potassium,mag Sulfatesbrand: Sod Sulf-Potass Sulf-Mag Sulf | 88 | 83 |
| Zolpidem Tartrate |
Practice location
Mailing address
Registry dates
- Enumerated
- 2006-05-10
- Last updated
- 2018-08-15
Frequently asked questions
- What is Andrew Marshall's NPI number?
- Andrew Marshall's National Provider Identifier (NPI) is 1801846290, a unique 10-digit ID issued by CMS for use in standard healthcare transactions.
- What is Andrew Marshall's specialty?
- Andrew Marshall is listed in the NPPES registry with a primary specialty of Gastroenterology Physician (Allopathic & Osteopathic Physicians).
- Where is Andrew Marshall located?
- Andrew Marshall's practice location on file with NPPES is 1800 Rockaway Ave, Hewlett, NY 11557.
- What is Andrew Marshall's phone number?
- The practice phone number listed in the NPPES registry for Andrew Marshall is (516) 593-2629.
- Does Andrew Marshall accept Medicare?
- Andrew Marshall is approved to bill Medicare according to CMS PECOS enrollment data (2026.04.01). Confirm current participation with the provider before scheduling.
- Is Andrew Marshall's NPI active?
- Yes — Andrew Marshall's NPI (1801846290) is active in the NPPES registry as of the last update on 2018-08-15.
Source: CMS NPPES Data Dissemination (June 2026). NPI Central is not affiliated with CMS. Data is provided as-is from the public registry.