Stephen Willis, MD
Gastroenterology Physician · Phillipsburg, NJ
Stephen Willis, MD is a gastroenterology physician with a practice address in Phillipsburg, New Jersey, and NPI 1629139076, issued on Dec 12, 2006. Check the license (New Jersey 25MA08845200, as entered in NPPES) on the New Jersey State Board of Medical Examiners; the Medicare figures below come from public CMS files.
- Name
- Stephen Willis
- Credential
- MD
- Primary taxonomy
- Gastroenterology Physician 207RG0100X
- License numbers
- 25MA08845200 NJ
MD459022 PA
Self-reported in NPPES; status is on the state search - Practice location
- 755 Memorial Pkwy Bldg 100, Phillipsburg, NJ 08865
- Phone
- (484) 526-6545
- Enumerated
- Dec 12, 2006
- Record last updated
- Oct 3, 2025
- Medicaid ID
- 0247138 NJ
- Medicare enrollment
- Enrolled (PECOS I20161027000164); accepts Medicare assignment
- Medical or professional school
- Rutgers R W Johnson Medical School (Cam/New Bruns/Pisc), 1998
- Entity
- Type 1 · individual
8 nearest gastroenterology physician records → All 735 in New Jersey → Look up another NPI →
Verify Stephen Willis in five checks
- 1IdentityNPI record in CMS NPPESNPI lookupConfirmed in NPPES
- 2LicenseActive license and public ordersNew Jersey State Board of Medical Examiners
Search for license 25MA08845200Check the board - 3Other statesLicenses and actions elsewhereDocInfo (FSMB)Not checked
- 4ExclusionsMedicare and Medicaid bansHHS-OIG exclusion listNot checked
- 5CertificationBoard certificationABMS AOA NCCPA AANPNot checked
20% more Medicare Part D claims than the average gastroenterology physician in 2024
977 Medicare Part D claims for 355 beneficiaries, against an average of 811 among the 16,445 providers of this specialty who prescribed in Part D.
Most prescribed
- Pantoprazole Sodium221 claims
- Omeprazole205 claims
- Famotidine139 claims
- Esomeprazole Magnesium88 claims
- Peg 3350-Electrolyte73 claims
- Sucralfate24 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): 95.6 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).
Bills Medicare through 2 group practices
- St Lukes Physician Group IncEaston, PA
- St Lukes Warren Physician Group PCHampton, NJ
Source: CMS Doctors and Clinicians National Downloadable File (the group practices a clinician bills Medicare through) (data.cms.gov).
Stephen Willis among 735 gastroenterology physician records in New Jersey
Stephen Willis, MD is one of 735 gastroenterology physician records with a practice address in New Jersey. 89% 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 12% of them.
- NPI issued2006 · 12% of these records are older, 44% newer
- In a Medicare fileYes · 89% of these records are
- In the CMS Doctors and Clinicians fileYes · 77% of these records are
- Graduated1998 · median 2000 among the 564 with a school on file
- Record last updated2025 · 54% 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 Jersey 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 Jersey
There are 735 gastroenterology physician records in New Jersey.
All 735 in New Jersey → Every provider in Phillipsburg → Gastroenterology Physician nationwide →
The 8 gastroenterology physician records with the nearest ZIP codes
- Thomas Kantor, MDPhillipsburg, NJ 088651962579490
- Chatargy Kaza, MDPhillipsburg, NJ 088651235232497
- Scott Aronson, MDSomerset, NJ 088731285655274
- Santhosh Cheela, MDOld Bridge, NJ 088571730169632
- William Ferges, M.D.Somerset, NJ 088731982909040
- Ira MerkelSomerset, NJ 088731336146125
- Sudha Nahar, M.D.Somerset, NJ 088731164463071
- Ritu Nahar, MDSomerset, NJ 088731801329651
Common questions
What is Stephen Willis, MD's NPI number?
Stephen Willis, MD's National Provider Identifier (NPI) is 1629139076, issued on Dec 12, 2006. An NPI identifies a provider in billing; it is not a license.
Where is Stephen Willis, MD located?
The NPPES record lists a practice address at 755 Memorial Pkwy Bldg 100, Phillipsburg, NJ, 08865. Phone: (484) 526-6545. Providers update this record themselves, so call before visiting.
How can I verify Stephen Willis, MD's license?
NPPES lists New Jersey license number 25MA08845200, as entered by the provider. Search the New Jersey State Board of Medical Examiners at https://newjersey.mylicense.com/verification/. The NPPES record confirms identity only; the state search shows license status, expiration and public orders.
How much does Stephen Willis, MD prescribe under Medicare Part D?
In 2024, Stephen Willis, MD had 977 Medicare Part D claims for 355 beneficiaries; the average among gastroenterology physician prescribers was 811. Part D covers Medicare prescriptions only.
What is Stephen Willis, MD's MIPS final score?
The 2023 MIPS final score is 95.6 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.