RONG J GUAN, MD LLC
RONG J GUAN, MD LLC is an organization registered with the National Plan and Provider Enumeration System (NPPES) under NPI 1003169327, based in Boston, MA. It is classified under Gastroenterology Physician.
Getting there
Here is what surrounds this office in Boston, based on OpenStreetMap data collected Sep 9, 2026. Parking is available about 873 ft away. There is EV charging 0.49 mi from the office (ChargePoint) — useful if you are driving in from out of town. The nearest transit stop is 559 ft away, served by Chinatown. A pharmacy sits 0.27 mi from the entrance (CVS Pharmacy), which helps if you leave with a prescription. If you arrive early, there is a coffee shop 274 ft away.
Getting here and what is nearby
Coffee Tbaar 15 ft ~1 min
32 Kneeland Street, Boston 02111
Mo-Su 11:00-21:00
Restaurant Tora Ramen 71 ft ~1 min
Coffee OneZo Tapioca 83 ft ~1 min
Restaurant Hong Kong Eatery 102 ft ~1 min
Restaurant Dunkin' 108 ft ~1 min
16 Kneeland Street, Boston 02111
Mo-Fr 06:00-16:00; Sa-Su 06:00-14:00
Transit Kneeland St @ Washington St 271 ft ~2 min
Coffee Cafe Darq 274 ft ~2 min
40 Beach Street, Boston 02111
Mo-Th 08:30-21:00; Fr 08:30-22:00; Sa, Su 09:00-22:00
Grocery Jia Ho Supermarket 289 ft ~2 min
Parking Beach Street Garage 307 ft ~2 min
14-40 Beach Street, Boston 02111
Transit Tufts Medical Center 528 ft ~3 min
Transit Chinatown 559 ft ~3 min
Pharmacy CVS Pharmacy 657 ft ~3 min
Hotel Moxy Boston Downtown 736 ft ~3 min
Parking Tremont Street Garage 865 ft ~4 min
274;276;284 Tremont Street, Boston 02111
Parking 873 ft ~4 min
109-153 Lincoln Street, Boston 02111
Hotel DoubleTree by Hilton Hotel Boston - Downtown 961 ft ~4 min
Hotel Hyatt Regency Boston 977 ft ~4 min
Pharmacy Koala Health 0.22 mi ~5 min
Convenience 7-Eleven 0.23 mi ~5 min
Pharmacy CVS Pharmacy 0.27 mi ~6 min
Mo-Fr 07:00-21:00; Sa 08:00-20:00; Su 09:00-19:00
Convenience 7-Eleven 0.30 mi ~6 min
Grocery Roche Bros. 0.33 mi ~7 min
8 Summer Street, Boston 02110
Mo-Sa 07:00-21:00; Su 08:00-20:00
Grocery Whole Foods Market 0.38 mi ~8 min
348 Harrison Avenue, Boston 02118
Mo-Su 07:00-22:00
Convenience 7-Eleven 0.47 mi ~10 min
EV charging ChargePoint 0.49 mi ~10 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 |
|---|---|---|
| 150086 | MA | Gastroenterology Physician primary |
This provider holds licence 150086 issued in MA. A licence number in NPPES reflects what was filed at registration — it does not confirm the licence is still active today.
This NPI does not appear in the PECOS Medicare enrolment file. Providers who do not bill Medicare — or who bill only through a group's enrolment — will not appear here. It is not a sign of any problem with the registration.
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-2 identifies an organization — a clinic, hospital, group practice, laboratory, or supplier. Individual clinicians working there hold their own NPI-1 numbers separately, so a bill may reference both.
| NPI | 1003169327 valid check digit |
|---|---|
| Entity type | Organization (NPI-2) |
| Enumeration date | Oct 24, 2012 |
| Last updated | Nov 2, 2012 |
| Status | Active |
| Practice address |
30 KNEELAND ST FL 5 Boston, MA 02111 (617) 290-9881 Fax (617) 350-6555 |
| Mailing address |
30 KNEELAND STREET, 5TH FLOOR Boston, MA 20111 |
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 | 1 | 6 | 9 | 3 | 2 |
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
| Doubled? | — | ×2 | — | ×2 | — | ×2 | — | ×2 | — | ×2 | — | ×2 | — | ×2 |
| Value | 8 | 0 | 8 | 8 | 0 | 2 | 0 | 0 | 3 | 2 | 6 | 9 | 3 | 4 |
Sum = 53 · next multiple of 10 = 60 · check digit = 7 · actual last digit = 7
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.