Doctor profile · Federal record
Dr. Stephen Willis, MD
Gastroenterology Physician (CMS: Gastroenterology) · Gastroenterology Physician · Phillipsburg, NJ
- NPI 1629139076
- Accepts Medicare
- MIPS 90.3 / 100 · 2023
- 28 yrs in practice
- Licensed in 2 states
- Male
- Group practice
- No sanctions
Practice & contact
Operates at 2 locations .
- Primary practice
-
755 Memorial Pkwy Bldg 100
Phillipsburg, NJ 088652748
(484) 526-6545 - Additional location
-
41 Corporate Dr Ste 101
Easton, PA 180452670
Credentials & registration
- NPI registered
- December 2006 — 20 yrs on file
- Profile last updated
- October 3, 2025
- Year of graduation
- 1998 — 28 yrs since
- Specialty taxonomy
- 207RG0100X — NUCC code
- State licenses (2)
- New Jersey #25MA08845200 · Pennsylvania #MD459022
- Medicaid
- NJ #0247138
Federal sanctions & exclusions
No sanctions, exclusions or revocations on file
Checked against OIG LEIE on NPI 1629139076. Last verified May 11, 2026.Medicare procedures · 2023
Top services delivered
Total services
780
Distinct HCPCS
10
Medicare allowed
$96,614
| HCPCS | Description | Services | Patients | Avg allowed | |
|---|---|---|---|---|---|
99213 |
Established patient office or other outpatient visit, 20-29 minutes | 188 | 160 | $92 | |
43239 |
Biopsy of esophagus, stomach, and/or upper small bowel using a flexible endoscope | 107 | 104 | $94 | |
45380 |
Biopsy of large bowel using a flexible endoscope | 99 | 98 | $143 | |
99214 |
Established patient office or other outpatient visit, 30-39 minutes | 74 | 64 | $125 | |
99232 |
Subsequent hospital care with moderate levelof medical decision making, if using time, at least 35 minutes | 56 | 42 | $83 | |
99203 |
New patient office or other outpatient visit, 30-44 minutes | 51 | 51 | $115 | |
99222 |
Initial hospital care with straightforward or low-level medical decision making, if using time, at least 55 minutes | 51 | 43 | $137 | |
45385 |
Removal of polyps or growths of large bowel using an endoscope with mechanical snare | 48 | 47 | $243 | |
99204 |
New patient office or other outpatient visit, 45-59 minutes | 25 | 25 | $166 | |
99223 |
Initial hospital care with moderate level of medical decision making, if using time, at least 75 minutes | 24 | 23 | $177 |
In context: peer comparison
Among 1 peers in Phillipsburg Gastroenterology Physician, average services per provider: 55. This provider delivers 14× the peer median.Medicare Part D · 2023
Top prescriptions
Total claims
728
Patients
288
Total drug cost
$131,155
| Drug | Type | Claims | Patients | Total cost |
|---|---|---|---|---|
| Pantoprazole Sodium | Generic | 281 | 87 | $3,942 |
| Famotidine | Generic | 104 | 38 | $1,807 |
| Peg 3350-Electrolyte (Sodium Chloride/Nahco3/Kcl/Peg) | Brand | 94 | 91 | $2,195 |
| Omeprazole | Generic | 79 | 36 | $1,131 |
| Gavilyte-G (Peg3350/Sod Sulf,Bicarb,Cl/Kcl) | Brand | 36 | 36 | $658 |
| Mesalamine ER (Mesalamine) | Brand | 24 | 0 | $16,724 |
| Creon (Lipase/Protease/Amylase) | Brand | 19 | 0 | $43,669 |
| Dicyclomine Hcl | Generic | 17 | 0 | $180 |
| Cholestyramine (Cholestyramine (With Sugar)) | Brand | 14 | 0 | $1,322 |
| Xifaxan (Rifaximin) | Brand | 14 | 0 | $44,122 |
Hospital affiliations
Frequently asked questions
What is Dr. Stephen Willis's medical specialty?
Dr. Stephen Willis practices Gastroenterology Physician in Phillipsburg, NJ.
Where does Dr. Stephen Willis practice?
Dr. Stephen Willis practices at 755 Memorial Pkwy Bldg 100, Phillipsburg, NJ 088652748. Office phone: 4845266545.
What is Dr. Stephen Willis's NPI?
Dr. Stephen Willis's National Provider Identifier (NPI) is 1629139076, issued by NPPES.
Does Dr. Stephen Willis accept Medicare assignment?
Yes. Dr. Stephen Willis accepts Medicare assignment, meaning Medicare-allowed amounts are accepted as full payment for covered services.
What procedures does Dr. Stephen Willis commonly perform?
Top Medicare-reported procedures in 2023: Established patient office or other outpatient visit (HCPCS 99213); Biopsy of esophagus, stomach, and/or upper small bowel using a flexible endoscope (HCPCS 43239); Biopsy of large bowel using a flexible endoscope (HCPCS 45380). Source: CMS Medicare Physician & Other Practitioners file.