Rajkumar Mariwalla, M.D.
NPI 1154309037 · Gastroenterology Physician · West Islip, NY
Enrolled with Medicare as Practitioner - Gastroenterology · source: CMS PECOS Public Provider Enrollment (2026.04.01)
Rajkumar Mariwalla, M.D. is a Gastroenterology Physician provider in West Islip, NY (NPI 1154309037).
Provider details
- NPI number
- 1154309037
- Entity type
- Individual
- Primary specialty
- Gastroenterology PhysicianAllopathic & Osteopathic Physicians
- Credential
- M.D.
- Sex
- Male
- Sole proprietor
- No
- License
- 143127 (NY)
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
20 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
1,771 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 Low Level OD Decision Making, If Using Time, 20 Minutes Or More99213 | 873 | $102 |
| New Patient Office Or Other Outpatient Visit With Low Level of Medical Decision Making, If Using Time, 30 Minutes Or More99203 | 299 | $127 |
| Biopsy of Esophagus, Stomach, And/Or Upper Small Bowel Using a Flexible Endoscope43239 | 156 | $142 |
| Colorectal Cancer Screening; Colonoscopy on Individual at High RiskG0105 | 107 | $197 |
| Established Patient Office Or Other Outpatient Visit With Moderate Level of Decision Making, If Using Time, 30 Minutes Or More99214 | 98 | $142 |
What this provider prescribes (Medicare Part D)
Top drugs by Medicare Part D claim volume, 2024 · 11 distinct drugs on file.
| Drug | Part D claims (2024) | Beneficiaries |
|---|---|---|
| Omeprazole | 277 | 156 |
| Pantoprazole Sodium | 102 | 66 |
| Famotidine | 65 | 47 |
| Sodium, Potassium,mag Sulfatesbrand: Sod Sulf-Potass Sulf-Mag Sulf | 30 | 30 |
| Mesalamine | 30 | 14 |
| Cholestyramine (with Sugar)brand: Cholestyramine | 27 | 19 |
| Dicyclomine Hcl | 23 | 15 |
Transparency — industry payments
Based on CMS Open Payments, 2024; not all care is captured.
$28,573 across 16 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
- 2006-01-02
- Last updated
- 2014-01-08
Frequently asked questions
- What is Rajkumar Mariwalla's NPI number?
- Rajkumar Mariwalla's National Provider Identifier (NPI) is 1154309037, a unique 10-digit ID issued by CMS for use in standard healthcare transactions.
- What is Rajkumar Mariwalla's specialty?
- Rajkumar Mariwalla is listed in the NPPES registry with a primary specialty of Gastroenterology Physician (Allopathic & Osteopathic Physicians).
- Where is Rajkumar Mariwalla located?
- Rajkumar Mariwalla's practice location on file with NPPES is 1175 Montauk Hwy, West Islip, NY 11795-4939.
- What is Rajkumar Mariwalla's phone number?
- The practice phone number listed in the NPPES registry for Rajkumar Mariwalla is (631) 669-1171.
- Does Rajkumar Mariwalla accept Medicare?
- Rajkumar Mariwalla is approved to bill Medicare according to CMS PECOS enrollment data (2026.04.01). Confirm current participation with the provider before scheduling.
- Is Rajkumar Mariwalla's NPI active?
- Yes — Rajkumar Mariwalla's NPI (1154309037) is active in the NPPES registry as of the last update on 2014-01-08.
Source: CMS NPPES Data Dissemination (June 2026). NPI Central is not affiliated with CMS. Data is provided as-is from the public registry.