Rex Chung, M.D.
Rex Chung, M.D. is a Surgical Critical Care Physician in Loma Linda, CA, registered under NPI 1003021882. This provider registers 2 separate taxonomy codes, which usually means they practise across more than one recognised specialty. NPPES records them as a sole proprietor, meaning the practice is not incorporated as a separate legal entity.
Getting there
Here is what surrounds this office in Loma Linda, based on OpenStreetMap data collected Aug 30, 2026. Parking is available about 475 ft away. The nearest transit stop is 0.22 mi away, served by Barton @ Campus Eastbound. If you arrive early, there is a coffee shop 862 ft away.
Getting here and what is nearby
Transit Campus @ University Northbound 217 ft ~1 min
Transit Campus @ University Southbound 228 ft ~1 min
Parking 275 ft ~2 min
Parking 281 ft ~2 min
Parking 475 ft ~2 min
Coffee Cafe Society 862 ft ~4 min
Transit Barton @ Campus Eastbound 0.22 mi ~5 min
Hotel Loma Linda Inn 0.22 mi ~5 min
Grocery Loma Linda Market Juice Bar 0.35 mi ~7 min
Grocery Loma Linda Market 0.36 mi ~8 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 |
|---|---|---|
| A99992 | CA | Surgery Physician |
| A99992 | CA | Surgical Critical Care Physician primary |
This provider holds licence A99992 issued in CA. 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 - Critical Care (intensivists)
- PAC ID
- 6709054810
- Enrollment ID
- I20110715000342
Medicare enrolment is recorded as approved under the provider type Practitioner - Critical Care (intensivists). 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 Surgical Critical Care covers
A surgeon with expertise in the management of the critically ill and postoperative patient, particularly the trauma victim, who specializes in critical care medicine diagnoses, treats and supports patients with multiple organ dysfunction. This specialist may have administrative responsibilities for intensive care units and may also facilitate and coordinate patient care among the primary physician, the critical care staff and other specialists. NUCC Health Care Provider Taxonomy, code 2086S0102X
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 | |
|---|---|---|---|---|
| 208600000X | Surgery Physician | A99992 | CA | |
| 2086S0102X | Surgical Critical Care Physician Surgical Critical Care | A99992 | 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-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 | 1003021882 valid check digit |
|---|---|
| Entity type | Individual (NPI-1) |
| Enumeration date | May 14, 2007 |
| Last updated | Mar 23, 2016 |
| Status | Active |
| Sole proprietor | Yes |
| Gender | Male |
| Credential | M.D. |
| Practice address |
11175 CAMPUS ST RM 21008 Loma Linda, CA 92350 (909) 558-8131 |
| Mailing address |
25246 BARTON RD APT. #12 Loma Linda, CA 92354 |
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 | 2 | 1 | 8 | 8 |
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
| Doubled? | — | ×2 | — | ×2 | — | ×2 | — | ×2 | — | ×2 | — | ×2 | — | ×2 |
| Value | 8 | 0 | 8 | 8 | 0 | 2 | 0 | 0 | 3 | 0 | 2 | 2 | 8 | 7 |
Sum = 48 · next multiple of 10 = 50 · check digit = 2 · actual last digit = 2
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.