Doctor profile · Federal record
Dr. Felice Zwas, M.D.
Gastroenterology Physician (CMS: Gastroenterology) · Greenwich, CT
- NPI 1225059116
- Accepts Medicare
- MIPS 83.2 / 100 · 2023
- 46 yrs in practice
- Female
- Solo practice
- No sanctions
Practice & contact
- Primary practice
-
500 W Putnam Ave, Suite 100
Greenwich, CT 068306086
(203) 863-2900
fax (203) 863-2901
Credentials & registration
- NPI registered
- July 2006 — 20 yrs on file
- Profile last updated
- July 8, 2007
- Year of graduation
- 1980 — 46 yrs since
- Specialty taxonomy
- 207RG0100X — NUCC code
- State license (1)
- Connecticut #028878
- Medicaid
- CT #1288788
Federal sanctions & exclusions
No sanctions, exclusions or revocations on file
Checked against OIG LEIE on NPI 1225059116. Last verified May 11, 2026.Medicare procedures · 2023
Top services delivered
Total services
896
Distinct HCPCS
10
Medicare allowed
$120,759
| HCPCS | Description | Services | Patients | Avg allowed | |
|---|---|---|---|---|---|
45380 |
Biopsy of large bowel using a flexible endoscope | 154 | 152 | $183 | |
99214 |
Established patient office or other outpatient visit, 30-39 minutes | 148 | 136 | $137 | |
43239 |
Biopsy of esophagus, stomach, and/or upper small bowel using a flexible endoscope | 137 | 129 | $104 | |
99213 |
Established patient office or other outpatient visit, 20-29 minutes | 105 | 102 | $96 | |
99203 |
New patient office or other outpatient visit, 30-44 minutes | 92 | 92 | $120 | |
G0105 |
Colorectal cancer screening; colonoscopy on individual at high risk | 76 | 76 | $190 | |
99202 |
New patient office or other outpatient visit, 15-29 minutes | 67 | 67 | $77 | |
J7050 |
Infusion, normal saline solution, 250 cc | 42 | 15 | $1 | |
45385 |
Removal of polyps or growths of large bowel using an endoscope with mechanical snare | 39 | 39 | $266 | |
G0121 |
Colorectal cancer screening; colonoscopy on individual not meeting criteria for high risk | 19 | 19 | $194 |
In context: peer comparison
Among 2 peers in Greenwich Gastroenterology Physician, average services per provider: 69. This provider delivers 13× the peer median.Open Payments
Industry payments received
All-time total
$625
Transactions
34
Manufacturers
9
| Payer (manufacturer) | Industry | Txns | Amount |
|---|---|---|---|
| Abbvie INC. | 15 | $261.99 | |
| Pfizer INC. | 11 | $152.14 | |
| Ardelyx, INC. | 2 | $51.35 | |
| Takeda Pharmaceuticals U.S.A., INC. | 1 | $32.82 | |
| Madrigal Pharmaceuticals | 1 | $30.25 | |
| Celgene Corporation | 1 | $25.45 | |
| Janssen Biotech, INC. | 1 | $24.78 | |
| Aimmune Therapeutics, INC. | 1 | $23.54 | |
| Lilly USA, LLC | 1 | $22.18 |
By nature of payment
Medicare Part D · 2023
Top prescriptions
Total claims
858
Patients
223
Total drug cost
$874,771
| Drug | Type | Claims | Patients | Total cost |
|---|---|---|---|---|
| Pantoprazole Sodium | Generic | 353 | 106 | $6,216 |
| Famotidine | Generic | 183 | 53 | $4,145 |
| Omeprazole | Generic | 55 | 19 | $794 |
| Mesalamine | Generic | 45 | 12 | $28,061 |
| Ondansetron Odt (Ondansetron) | Brand | 38 | 22 | $1,168 |
| Linzess (Linaclotide) | Brand | 36 | 11 | $37,283 |
| Creon (Lipase/Protease/Amylase) | Brand | 22 | 0 | $55,219 |
| Budesonide Ec (Budesonide) | Brand | 21 | 0 | $7,506 |
| Stelara (Ustekinumab) | Brand | 21 | 0 | $578,897 |
| Apriso (Mesalamine) | Brand | 18 | 0 | $9,579 |
Hospital affiliations
Frequently asked questions
What is Dr. Felice Zwas's medical specialty?
Dr. Felice Zwas practices Gastroenterology Physician in Greenwich, CT.
Where does Dr. Felice Zwas practice?
Dr. Felice Zwas practices at 500 W Putnam Ave, Greenwich, CT 068306086. Office phone: 2038632900.
What is Dr. Felice Zwas's NPI?
Dr. Felice Zwas's National Provider Identifier (NPI) is 1225059116, issued by NPPES.
Does Dr. Felice Zwas accept Medicare assignment?
Yes. Dr. Felice Zwas accepts Medicare assignment, meaning Medicare-allowed amounts are accepted as full payment for covered services.
What procedures does Dr. Felice Zwas commonly perform?
Top Medicare-reported procedures in 2023: Biopsy of large bowel using a flexible endoscope (HCPCS 45380); Established patient office or other outpatient visit (HCPCS 99214); Biopsy of esophagus, stomach, and/or upper small bowel using a flexible endoscope (HCPCS 43239). Source: CMS Medicare Physician & Other Practitioners file.