RICHARD B. D. CHUN, M.D. PROFESSIONAL CORPORATION
RICHARD B. D. CHUN, M.D. PROFESSIONAL CORPORATION is an organization registered with the National Plan and Provider Enumeration System (NPPES) under NPI 1003000563, based in Roseville, CA. The organization lists 2 taxonomy classifications, with Primary Care Clinic/Center recorded as primary.
Getting there
Here is what surrounds this office in Roseville, based on OpenStreetMap data collected Aug 28, 2026. Parking is available about 0.45 mi away. The nearest transit stop is 0.20 mi away, served by Sunrise at Conroy. A pharmacy sits 0.24 mi from the entrance (Rite Aid), which helps if you leave with a prescription. If you arrive early, there is a coffee shop 0.38 mi away.
Getting here and what is nearby
Transit 720 Sunrise 337 ft ~2 min
Transit Sunrise before Coloma 459 ft ~2 min
Transit Sunrise at Conroy 0.20 mi ~5 min
Pharmacy Rite Aid 0.24 mi ~5 min
Coffee Starbucks 0.25 mi ~5 min
Grocery Safeway 0.25 mi ~5 min
Parking 0.30 mi ~7 min
Gas station Safeway Fuel Station 0.32 mi ~7 min
Convenience 7-Eleven 0.33 mi ~7 min
Gas station 7-Eleven 0.34 mi ~7 min
Coffee Peet's Coffee 0.38 mi ~8 min
1200 Cirby Way, Roseville 95661
Restaurant McDonald's 0.39 mi ~8 min
Grocery Bel Air 0.42 mi ~9 min
1039 Sunrise Avenue, Roseville 95661
Parking 0.43 mi ~9 min
Restaurant Manley's Donuts 0.44 mi ~9 min
Parking 0.45 mi ~10 min
Restaurant Rose Garden Chinese Restaurant 0.47 mi ~10 min
Mo,We-Sa 11:00-21:00; Su 12:00-21:00
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 |
|---|---|---|
| C28231 | CA | Gastroenterology Physician |
| C28231 | CA | Primary Care Clinic/Center primary |
This provider holds licence C28231 issued in CA. 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 Primary Care covers
Definition to come... NUCC Health Care Provider Taxonomy, code 261QP2300X
All registered taxonomy codes
This provider registers 2 taxonomy codes. The primary code is what appears on most claims; the others record additional recognised specialties.
| Code | Specialty | Licence | State | |
|---|---|---|---|---|
| 207RG0100X | Gastroenterology Physician Gastroenterology | C28231 | CA | |
| 261QP2300X | Primary Care Clinic/Center Primary Care | C28231 | CA | primary |
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 | 1003000563 valid check digit |
|---|---|
| Entity type | Organization (NPI-2) |
| Enumeration date | Aug 28, 2007 |
| Last updated | Apr 24, 2014 |
| Status | Active |
| Practice address |
729 SUNRISE AVE STE 619 Roseville, CA 95661 (916) 783-7118 |
| Other identifiers |
00C282310
· Other (CA) 00C282310 · Medicaid (CA) 110233272 · Other (CA) ========= · Other C28231 · Other (CA) |
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 | 0 | 0 | 0 | 5 | 6 |
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
| Doubled? | — | ×2 | — | ×2 | — | ×2 | — | ×2 | — | ×2 | — | ×2 | — | ×2 |
| Value | 8 | 0 | 8 | 8 | 0 | 2 | 0 | 0 | 3 | 0 | 0 | 0 | 5 | 3 |
Sum = 37 · next multiple of 10 = 40 · check digit = 3 · actual last digit = 3
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.