Rajkumar G. Mariwalla, M.D.
Gastroenterology Physician · West Islip, NY
Rajkumar G. Mariwalla, M.D. is a gastroenterology physician with a practice address in West Islip, New York, and NPI 1154309037, issued on Jan 2, 2006. Check the license (New York 143127, as entered in NPPES) on the NYS Education Department, Office of the Professions; the Medicare figures below come from public CMS files.
- Name
- Rajkumar G. Mariwalla
- Credential
- M.D.
- Primary taxonomy
- Gastroenterology Physician 207RG0100X
- License number
- 143127 NY
Self-reported in NPPES; status is on the state search - Practice location
- 1175 Montauk Hwy, West Islip, NY 11795
- Phone
- (631) 669-1171
- Enumerated
- Jan 2, 2006
- Record last updated
- Jan 8, 2014 (not updated in 12 years: call before relying on the address or phone)
- Fax
- (631) 669-1912
- Medicare enrollment
- Enrolled (PECOS I20060131000158); accepts Medicare assignment
- Entity
- Type 1 · individual
8 nearest gastroenterology physician records → All 1,797 in New York → Look up another NPI →
Also registered at 1175 Montauk Hwy
A shared address usually means a shared clinic or building; it does not show who employs whom.
- Christine Cerniello, DOPediatrics Physician1790881167
- Noel D'Silva, M.D.Gastroenterology Physician1639132665
- Eujenia Darakchieva, PA-CPhysician Assistant1922399757
- William Disanti, M.D.Gastroenterology Physician1336188929
- Andrea Gibbons, R.P.A.-C.Physician Assistant1083774509
- Kelly HeraghtyFamily Nurse Practitioner1609423821
Verify Rajkumar G. Mariwalla in five checks
- 1IdentityNPI record in CMS NPPESNPI lookupConfirmed in NPPES
- 2LicenseActive license and public ordersNYS Education Department, Office of the Professions
Search for license 143127Check the board - 3Other statesLicenses and actions elsewhereDocInfo (FSMB)Not checked
- 4ExclusionsMedicare and Medicaid bansHHS-OIG exclusion listNot checked
- 5CertificationBoard certificationABMS AOA NCCPA AANPNot checked
14% fewer Medicare Part D claims than the average gastroenterology physician in 2024
699 Medicare Part D claims for 369 beneficiaries, against an average of 811 among the 16,445 providers of this specialty who prescribed in Part D.
Most prescribed
- Omeprazole277 claims
- Pantoprazole Sodium102 claims
- Famotidine65 claims
- Mesalamine30 claims
- Sod Sulf-Potass Sulf-Mag Sulf30 claims
- Cholestyramine27 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.
The MIPS final score for 2023 (Medicare payment program): 24.6 of 100
The Merit-based Incentive Payment System score is reported for this clinician. Four categories are weighted into the final score; the average among 454,083 clinicians with a measured score was 83.5.
Source: CMS Quality Payment Program, MIPS performance year 2023; category weights for 2023 (qpp.cms.gov).
Industry payments in 2024: $28,573.15
16 payments; by number, the most common kind was food and beverage; the largest payer was Olympus America 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
- Island Gastroenterology Consultants PCWest Islip, NY
Source: CMS Doctors and Clinicians National Downloadable File (the group practices a clinician bills Medicare through) (data.cms.gov).
Rajkumar G. Mariwalla among 1,797 gastroenterology physician records in New York
Rajkumar G. Mariwalla, M.D. is one of 1,797 gastroenterology physician records with a practice address in New York. 88% of them appear in a Medicare file (Part D prescribing, MIPS, Open Payments or Medicare group billing); this one does. Its NPI, issued in 2006, is newer than 15% of them.
- NPI issued2006 · 15% of these records are older, 44% newer
- In a Medicare fileYes · 88% of these records are
- In the CMS Doctors and Clinicians fileYes · 77% of these records are
- Graduated1975 · median 1999 among the 1,378 with a school on file
- Record last updated2014 · 65% 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 New York practice address; Medicare files: CMS Part D Prescribers 2024, MIPS 2023, Open Payments 2024, Doctors and Clinicians (data.cms.gov).
Gastroenterology Physician providers in New York
There are 1,797 gastroenterology physician records in New York.
All 1,797 in New York → Every provider in West Islip → Gastroenterology Physician nationwide →
The 8 gastroenterology physician records with the nearest ZIP codes
- Nabras Ahmed, D.O.West Islip, NY 117951285022483
- Noel D'Silva, M.D.West Islip, NY 117951639132665
- William Disanti, M.D.West Islip, NY 117951336188929
- Rajiv Saxena, MDWest Islip, NY 117951598837858
- Krishnaiyer Subramani, MDWest Islip, NY 117951295794105
- Mitchell Weinstein, D.O.West Islip, NY 117951942292206
- Juan Carlos Bucobo, M.D.Stony Brook, NY 117941982892592
- Michael Clores, D.O.Stony Brook, NY 117941598024390
Common questions
What is Rajkumar G. Mariwalla, M.D.'s NPI number?
Rajkumar G. Mariwalla, M.D.'s National Provider Identifier (NPI) is 1154309037, issued on Jan 2, 2006. An NPI identifies a provider in billing; it is not a license.
Where is Rajkumar G. Mariwalla, M.D. located?
The NPPES record lists a practice address at 1175 Montauk Hwy, West Islip, NY, 11795. Phone: (631) 669-1171. Providers update this record themselves, so call before visiting.
How can I verify Rajkumar G. Mariwalla, M.D.'s license?
NPPES lists New York license number 143127, as entered by the provider. Search the NYS Education Department, Office of the Professions at https://www.op.nysed.gov/services/verifications/online-verification-searches. The NPPES record confirms identity only; the state search shows license status, expiration and public orders.
How much does Rajkumar G. Mariwalla, M.D. prescribe under Medicare Part D?
In 2024, Rajkumar G. Mariwalla, M.D. had 699 Medicare Part D claims for 369 beneficiaries; the average among gastroenterology physician prescribers was 811. Part D covers Medicare prescriptions only.
What is Rajkumar G. Mariwalla, M.D.'s MIPS final score?
The 2023 MIPS final score is 24.6 of 100. The average among 454,083 clinicians with a measured score was 83.5.
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.