Cheng-hung Tai
Cheng-hung Tai is a Gastroenterology Physician in Greenwich, CT, registered under NPI 1003310434.
Getting there
Here is what surrounds this office in Greenwich, based on OpenStreetMap data collected Sep 17, 2026. Parking is available about 733 ft away. A pharmacy sits 0.26 mi from the entrance (CVS Pharmacy), which helps if you leave with a prescription.
Getting here and what is nearby
Parking 447 ft ~2 min
Parking 563 ft ~3 min
Parking 733 ft ~3 min
Restaurant Little Thai Kitchen 0.20 mi ~4 min
Restaurant Wendy's 0.22 mi ~5 min
422 West Putnam Avenue, Greenwich 06830
Pharmacy CVS Pharmacy 0.26 mi ~6 min
Restaurant Pasta Bowls 0.32 mi ~7 min
Distances are straight‑line estimates — walking routes may be longer. Hours and phone numbers can change; call ahead to confirm.
Credentials and Medicare
| Licence | State | Specialty |
|---|---|---|
| 68743 | CT | Gastroenterology Physician primary |
This provider holds licence 68743 issued in CT. A licence number in NPPES reflects what was filed at registration — it does not confirm the licence is still active today.
- Status
- Approved
- Provider type
- Practitioner - Internal Medicine
- PAC ID
- 3678817251
- Enrollment ID
- I20210708001212
Medicare enrolment is recorded as approved under the provider type Practitioner - Internal Medicine. Being enrolled means the provider can bill Medicare; it does not tell you whether they are currently accepting new Medicare patients. Call the office to confirm.
What Gastroenterology covers
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. NUCC Health Care Provider Taxonomy, code 207RG0100X
The taxonomy records how the provider classifies their own practice. It does not confirm which conditions they currently treat, whether they are accepting new patients, or which insurance they take — call the office for that.
Full NPPES record
An NPI-1 identifies a single person. It stays with the clinician for life, even if they move practice or change state, which is why the address on file can lag behind where they actually work today.
| NPI | 1003310434 valid check digit |
|---|---|
| Entity type | Individual (NPI-1) |
| Enumeration date | Mar 21, 2018 |
| Last updated | Jun 5, 2025 |
| Status | Active |
| Sole proprietor | No |
| Gender | Male |
| Practice address |
15 VALLEY DR FL 3 Greenwich, CT 06831 (917) 497-7661 |
| Mailing address |
100 E 77TH ST New York, NY 10075 |
Number check
How the check works, step by step
Every NPI carries a Luhn check digit — the same scheme used on credit cards. CMS prefixes the number with 80840 before computing it, which marks it as a US health identifier.
| Digit | 8 | 0 | 8 | 4 | 0 | 1 | 0 | 0 | 3 | 3 | 1 | 0 | 4 | 3 |
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
| Doubled? | — | ×2 | — | ×2 | — | ×2 | — | ×2 | — | ×2 | — | ×2 | — | ×2 |
| Value | 8 | 0 | 8 | 8 | 0 | 2 | 0 | 0 | 3 | 6 | 1 | 0 | 4 | 6 |
Sum = 46 · next multiple of 10 = 50 · check digit = 4 · actual last digit = 4
A valid check digit only means the number is well-formed. It does not mean the provider is licensed, active, or in good standing — those are separate questions answered by the sections above.