DR. STEPHEN WILLIS MD
NPI 1629139076
Internal Medicine - Gastroenterology in Phillipsburg, NJ

Q: What is Stephen Willis's NPI number?

The NPI number for Stephen Willis is 1629139076. It was assigned to this individual provider in the NPPES registry on December 12, 2006.

Q: What is Stephen Willis's specialty?

The primary specialty registered for this NPI is Internal Medicine, specializing in Gastroenterology, with taxonomy code 207RG0100X.

Q: When was this NPI record last updated?

The NPPES record for Stephen Willis was last updated on October 3, 2025. NPI Profile syncs weekly with the NPPES registry data releases published by CMS. This NPI record was last updated 12 months ago. If this record has changed at CMS more recently, you can request an on-demand re-check against the live CMS registry, directly from this page.

Active since December 12, 2006PECOS EnrolledAccepts Medicare Assignment

95.64/100

CMS Quality Rating

755 MEMORIAL PKWY BLDG 100, PHILLIPSBURG, NJ 08865(484) 526-6545 Get Directions Write a Review

NPPES record last updated: October 3, 2025. Verified against the NPPES registry weekly; last sync: October 18, 2026.

On this page

About Dr. Stephen Willis Md NPPES

Official registry information on file with the National Plan and Provider Enumeration System.

DR. STEPHEN WILLIS MD (NPI 1629139076) is an individual gastroenterology provider in Phillipsburg, New Jersey, licensed in New Jersey (25MA08845200) and active in the NPI registry since December 2006. He is enrolled in Medicare PECOS, is affiliated with St Luke's Warren Hospital, and maintains a secondary practice location in Easton.

NPPES Registry Identity

NPI1629139076

Entity TypeIndividualMale

Primary Taxonomy207RG0100X

Provider Legal NameDR. STEPHEN WILLISCredential: MD

Location Address755 MEMORIAL PKWY BLDG 100Phillipsburg, NJ 08865-2748

Mailing Address755 Memorial Pkwy Bldg 100Phillipsburg, NJ 08865-2748

Phone(484) 526-6545

Sole ProprietorNo

Medical School CMSRutgers R W Johnson Medical School (cam/new Bruns/pisc)Graduated 1998

Enumeration DateDecember 12, 2006

Last NPPES UpdateOctober 3, 2025

NPPES CertifiedOctober 3, 2025

✔ NPI 1629139076 is a valid, active identifier and passes the ISO check-digit test.

Specialties & Licenses

★ Primary SpecialtyInternal Medicine · GastroenterologyAllopathic & Osteopathic Physicians

Taxonomy Code207RG0100X

Licenses✔ Licensed in NJ · 25MA08845200✔ Licensed in PA · MD459022

Definition

An internist who specializes in diagnosis and treatment of diseases of the digestive organs including the stomach, bowels, liver and gallbladder. This specialist treats conditions such as abdominal pain, ulcers, diarrhea, cancer and jaundice and performs complex diagnostic and therapeutic procedures using endoscopes to visualize internal organs.

755 MEMORIAL PKWY BLDG 100, Phillipsburg, NJ 08865

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Secondary Practice Location 1

Location 141 Corporate Dr Ste 101Easton, PA 18045-2670 · Phone (484) 526-6545

Other Identifiers 1

Medicaid0247138NJ

Medicare Participation & PECOS CMS

Medicare enrollment, assignment, billing reassignment, and ordering and referring status from CMS.

Medicare Enrollment Status

✔

Enrolled in Medicare and accepts Medicare assignment

Dr. Stephen Willis Md is registered in PECOS and agrees to accept the Medicare-approved amount as full payment. Medicare patients are not billed beyond the standard deductible and coinsurance.

PECOS PAC ID2062491038

PECOS Enrollment IDI20110201000091, I20161027000164

Eligible to Order & Refer✔ Part B Labs & Imaging✔ Durable Medical Equipment✔ Home Health Agency✔ Power Mobility DevicesPer the CMS Ordering and Referring file. Eligibility means Medicare pays claims that this provider orders or refers for these categories.

Medicare Billing Reassignments

Medicare enrollment records show Stephen Willis reassigns Medicare billing to 3 organizations. Each organization bills Medicare for the services this provider delivers there; the nearest is listed first.

St. Luke's Warren Physician Group, PC

Same address

Gastroenterology

755 MEMORIAL PKWY
Phillipsburg, NJ 08865

Reassigned Medicare billing, New Jersey enrollment
Medicare enrollment name: St Lukes Warren Physician Group PC
528 clinicians in this Medicare group

NPI 1083215594 (484) 526-4000

St. Luke's Physician Group Inc.

1.8 mi

Infectious Disease

100 N 3RD ST, 2ND FLOOR
Easton, PA 18042

Reassigned Medicare billing, Pennsylvania enrollment
Medicare enrollment name: St Lukes Physician Group Inc
2,851 clinicians in this Medicare group

NPI 1588043376 (484) 503-8010

Family Care Centers Inc.

20 mi

Internal Medicine

206 E BROWN ST
E Stroudsburg, PA 18301

Reassigned Medicare billing, Pennsylvania enrollment
500 clinicians in this Medicare group

NPI 1669563037 (570) 476-3507

Source: CMS Revalidation Reassignment List, October 2026 release. Reassignment records can lag staffing changes; confirm a current affiliation with the organization.

Areas of Expertise CMS Part B claims 17

Services this provider delivered to Medicare fee-for-service patients, from the CMS Medicare utilization data. Higher counts generally reflect more experience with a service; care delivered outside Medicare is not included.

Biopsy of esophagus, stomach, and/or upper small bowel using a flexible endoscope 43239

This procedure involves using a thin, flexible tube with a light and camera, known as an endoscope, to examine the esophagus, stomach, and upper part of the small intestine. Small tissue samples are taken for further examination to help diagnose various conditions.

195 services192 patients

Established patient office or other outpatient visit with low level od decision making, if using time, 20 minutes or more 99213

This is a routine visit for patients who have already been seen by the healthcare provider. During this approximately 20-29 minute appointment, your health status will be evaluated and any necessary treatments or tests will be discussed. It's a chance to address any health concerns you may have.

184 services165 patients

Biopsy of large bowel using a flexible endoscope 45380

A biopsy of the large bowel using a flexible endoscope is a procedure where a thin, flexible tube with a camera is inserted through the rectum to examine the bowel. If abnormal tissue is found, a small sample is taken for further examination. This helps in diagnosing conditions like inflammation, polyps, or cancer.

156 services155 patients

Subsequent hospital care with moderate levelof medical decision making, if using time, at least 35 minutes 99232

Follow-up hospital inpatient care involves daily check-ups while you're admitted in the hospital. Typically, a healthcare provider spends about 25 minutes each day reviewing your condition, adjusting treatment if needed, and answering any questions you might have.

117 services81 patients

Removal of polyps or growths of large bowel using an endoscope with mechanical snare 45385

This procedure involves using a thin, flexible tube called an endoscope to examine the large bowel. If any abnormal growths or polyps are found, a tool called a mechanical snare is used to remove them. This is a common method to prevent potential health issues.

99 services98 patients

Established patient office or other outpatient visit with moderate level of decision making, if using time, 30 minutes or more 99214

This is a routine check-up for patients who have previously visited our clinic. It involves a comprehensive review of your health and any ongoing treatments. The consultation lasts between 30-39 minutes, allowing enough time to discuss any concerns.

83 services76 patients

Initial hospital care with straightforward or low-level medical decision making, if using time, at least 55 minutes 99222

Initial hospital inpatient care is a service where a healthcare provider spends about 50 minutes per day overseeing your care while you're admitted in the hospital. This includes reviewing your health status, planning your treatment, and ensuring your safety and comfort.

62 services61 patients

Initial hospital care with moderate level of medical decision making, if using time, at least 75 minutes 99223

Initial hospital inpatient care per day, typically 70 minutes, refers to the daily medical service provided to patients admitted to the hospital. This includes a comprehensive evaluation, diagnosis, treatment plan, and monitoring of your health condition. It ensures your well-being during your hospital stay.

62 services61 patients

New patient office or other outpatient visit with low level of medical decision making, if using time, 30 minutes or more 99203

This service involves an initial office or outpatient visit for a new patient. The healthcare professional will spend 30-44 minutes understanding your health history, current issues, and discussing possible treatment plans. It's a comprehensive evaluation to start your healthcare journey.

36 services36 patients

Diagnostic exam of esophagus, stomach, and/or upper small bowel using a flexible endoscope 43235

This procedure, known as an upper endoscopy, involves inserting a thin, flexible tube with a camera down the throat to examine the esophagus, stomach, and upper small bowel. It helps diagnose conditions like ulcers or inflammation.

34 services34 patients

Diagnostic exam of large bowel using a flexible endoscope 45378

This procedure, known as a colonoscopy, involves using a flexible tube with a light and camera to examine the large intestine. It helps detect any abnormalities such as polyps or inflammation. It's a standard procedure to ensure gut health.

31 services30 patients

Colorectal cancer screening; colonoscopy on individual at high risk G0105

Colorectal cancer screening, specifically a colonoscopy, is a preventive measure for those at high risk. A thin, flexible tube with a camera inspects the colon to spot any abnormal growths. This test helps detect potential issues early, enhancing the effectiveness of treatment.

31 services31 patients

Removal of polyps or growths of esophagus, stomach, and/or upper small bowel using an endoscope with mechanical snare 43251

This procedure involves the use of a thin, flexible instrument called an endoscope to visualize and remove abnormal growths, known as polyps, from the esophagus, stomach, or upper small bowel. A tool called a mechanical snare is used to safely cut and remove these growths.

30 services30 patients

Balloon dilation of esophagus, stomach, and/or upper small bowel using a flexible endoscope, less than 3.0 cm 43249

This procedure involves using a flexible tube with a camera, called an endoscope, to gently expand narrowed areas in your esophagus, stomach, or upper small bowel. A small balloon is inflated, making it easier for food and liquid to pass through. It's safe and effective.

27 services26 patients

New patient office or other outpatient visit with moderate level of medical decision making, if using time, 45 minutes or more 99204

This is a first-time office or outpatient visit lasting between 45-59 minutes. The healthcare provider evaluates your health, discusses your medical history, and may suggest further tests or treatments. It's an opportunity to ask questions and understand your health better.

25 services25 patients

Colorectal cancer screening; colonoscopy on individual not meeting criteria for high risk G0121

Colorectal cancer screening, such as a colonoscopy, is a preventive measure to detect early signs of cancer in the large intestine. For individuals not at high risk, it's typically recommended at age 50. A small, flexible tube with a camera is used to examine your colon. It's a safe, effective way to catch issues early.

21 services21 patients

Injection beneath lining of large bowel using a flexible endoscope 45381

This procedure involves a flexible tube, called an endoscope, being inserted into the large bowel. A small needle is then passed through the tube to inject medication under the bowel lining. This is typically done to treat inflammation or bleeding.

18 services17 patients

Hospital Affiliations CMS Care Compare 3

Hospitals where this provider delivers care, identified from recent Medicare claims and place-of-service records.

St Luke's Warren Hospital

Acute Care Hospitals · Phillipsburg, NJ

5/5 CMS rating

OwnershipVoluntary non-profit - Private

CMS Certification Number310060

Location185 Roseberry StPhillipsburg, NJ 08865 · Warren County

Emergency services

St Luke's Hospital Bethlehem

Acute Care Hospitals · Bethlehem, PA

5/5 CMS rating

OwnershipVoluntary non-profit - Private

CMS Certification Number390049

Location801 Ostrum StreetBethlehem, PA 18015 · Northampton County

Emergency services Birthing friendly

St Luke's Hospital - Easton Campus

Acute Care Hospitals · Easton, PA

5/5 CMS rating

OwnershipVoluntary non-profit - Private

CMS Certification Number390162

Location250 South 21st StreetEaston, PA 18042 · Northampton County

Emergency services

Physician Visit Costs CMS claims · ZIP area

Typical Medicare office-visit costs in the 08865 ZIP code area, from fee-for-service claims. These are area statistics, not this provider’s prices; actual charges vary by service and coverage.

New Patient

$144.86 typical visit price

range $63.84 – $190.92

Typical copayment $36.21 (range $15.96 – $47.73)

Most-billed visit code 99204

Established Patient

$111.57 typical visit price

range $20.97 – $155.92

Typical copayment $27.89 (range $5.24 – $38.98)

Most-billed visit code 99214

Amounts reflect what Medicare beneficiaries in this ZIP area are typically charged for office visits. Patients with other coverage should check their individual plans.

Medicare Quality Performance CMS QPP · MIPS

Performance in the CMS Quality Payment Program: the MIPS final score across four weighted categories, and the individual quality measures reported to Medicare.

95.64/100

MIPS Final ScoreMerit-based Incentive Payment System · CMS Quality Payment Program

Scored through an Alternative Payment Model

Quality

80.57

Promoting Interoperability

100

Improvement Activities

Frequently Asked Questions NPPES & CMS

Common questions about this NPI record, answered from the official NPPES registry and CMS datasets shown on this page.

What is Stephen Willis's NPI number?

The NPI number for Stephen Willis is 1629139076. It was assigned to this individual provider in the NPPES registry on December 12, 2006.

Where is Stephen Willis located?

Stephen Willis practices at 755 Memorial Pkwy Bldg 100, Phillipsburg, NJ 08865. The listed phone number is (484) 526-6545.

What is Stephen Willis's specialty?

The primary specialty registered for this NPI is Internal Medicine, specializing in Gastroenterology, with taxonomy code 207RG0100X.

Is Stephen Willis enrolled in Medicare?

Yes. Stephen Willis is registered in the Medicare PECOS system and accepts Medicare assignment, which means accepting the Medicare-approved amount as payment in full for covered services.

Which organizations bill Medicare for Stephen Willis's services?

According to the CMS Revalidation Reassignment List (October 2026 release), Stephen Willis reassigns Medicare benefits to 3 organizations: St. Luke's Warren Physician Group, PC (Phillipsburg, NJ), St. Luke's Physician Group Inc. (Easton, PA) and Family Care Centers Inc. (E Stroudsburg, PA). Each reassignment is filed with Medicare on form CMS-855R, signed by both the clinician and the organization, and lets the organization bill Medicare and receive payment for Stephen Willis's services. Reassignment records can lag staffing changes; confirm current arrangements with the organization.

Is Stephen Willis affiliated with any hospitals?

According to CMS data, Stephen Willis is affiliated with St Luke's Warren Hospital, St Luke's Hospital Bethlehem and St Luke's Hospital - Easton Campus.

When was this NPI record last updated?

The NPPES record for Stephen Willis was last updated on October 3, 2025. NPI Profile syncs weekly with the NPPES registry data releases published by CMS. This NPI record was last updated 12 months ago. If this record has changed at CMS more recently, you can request an on-demand re-check against the live CMS registry, directly from this page.