Marianna Gabriel, RD CHES
Marianna Gabriel, RD CHES is a Registered Dietitian in Irvine, CA, registered under NPI 1003440470. This provider registers 2 separate taxonomy codes, which usually means they practise across more than one recognised specialty.
Getting there
Here is what surrounds this office in Irvine, based on OpenStreetMap data collected Sep 9, 2026. Parking is available about 0.41 mi away. There is EV charging 454 ft from the office — useful if you are driving in from out of town. The nearest transit stop is 606 ft away, served by Alton Parkway @ Hoag Drive. A pharmacy sits 0.33 mi from the entrance (CVS Pharmacy), which helps if you leave with a prescription. If you arrive early, there is a coffee shop 0.42 mi away.
Getting here and what is nearby
Transit Alton-Kaiser Permanente 467 ft ~2 min
Transit Alton Parkway @ Hoag Irvine 469 ft ~2 min
EV charging 454 ft ~2 min
Parking 488 ft ~2 min
6630 Alton Parkway, Irvine 92618
Transit Alton Parkway @ Hoag Drive 606 ft ~3 min
Coffee S'wich 0.23 mi ~5 min
Tu-Fr 08:00-16:00; Mo,Sa 08:00-15:00
Parking 0.27 mi ~6 min
16375 Laguna Canyon Road, Irvine 92618
Restaurant Sharky's Woodfired Mexican Grill 0.27 mi ~6 min
6725 Quail Hill Parkway, Irvine 92603
Restaurant Johnny's Real New York Pizza 0.27 mi ~6 min
6721 Quail Hill Parkway, Irvine 92603
Restaurant O Fine Japanese Cuisine 0.27 mi ~6 min
6731 Quail Hill Parkway, Irvine 92603
Grocery Albertsons 0.27 mi ~6 min
6601 Quail Hill Parkway, Irvine 92603
Mo-Su 06:00-23:00
Pharmacy CVS Pharmacy 0.33 mi ~7 min
Coffee Starbucks 0.35 mi ~7 min
Gas station Arco 0.38 mi ~8 min
6501 Quail Hill Parkway, Irvine 92603
Convenience ampm 0.40 mi ~8 min
6501 Quail Hill Parkway, Irvine 92603
Parking 0.41 mi ~9 min
23 1/2 Pasteur, Irvine 92618
Coffee Starbucks 0.42 mi ~9 min
16215 Alton Parkway, Irvine 92618
Tu-Th 08:00-19:00; Mo,Fr 08:00-16:00
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 |
|---|---|---|
| 11815 | Registered Dietitian primary |
Licences are recorded in 0 states: . Providers licensed in several states often practise near a state border or deliver telehealth across state lines.
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 Dietitian, Registered covers
A Registered Dietitian (RD)/Registered Dietitian Nutritionist (RDN) is an individual uniquely trained in the science of nutrition and practice of dietetics to design and provide medical nutrition therapy (MNT) and other evidence-based applications of the Nutrition Care Process (NCP) that exemplify the profession's systematic approach to providing high quality nutrition care. Registered dietitians provide MNT for the purpose of disease prevention or management, or to treat or rehabilitate an illness, injury, or condition, with the use of specific, indicated physical and cognitive nutrition care services comprised of one or more of the following aspects of the NCP: nutrition assessment/reassessment, nutrition diagnosis, nutrition intervention (e.g., nutrition counseling, therapeutic diet ordering, and nutrition education) and nutrition monitoring and evaluation. NUCC Health Care Provider Taxonomy, code 133V00000X
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 | |
|---|---|---|---|---|
| 133V00000X | Registered Dietitian | 11815 | — | primary |
| 146M00000X | Intermediate Emergency Medical Technician | — | — |
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 | 1003440470 valid check digit |
|---|---|
| Entity type | Individual (NPI-1) |
| Enumeration date | Feb 25, 2020 |
| Last updated | Feb 25, 2020 |
| Status | Active |
| Sole proprietor | No |
| Gender | Female |
| Credential | RD CHES |
| Practice address |
6640 ALTON PKWY Irvine, CA 92618 (949) 932-6734 |
| Mailing address |
1 PALACIO Rancho Santa Margarita, CA 92688 |
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 | 4 | 4 | 0 | 4 | 7 |
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
| Doubled? | — | ×2 | — | ×2 | — | ×2 | — | ×2 | — | ×2 | — | ×2 | — | ×2 |
| Value | 8 | 0 | 8 | 8 | 0 | 2 | 0 | 0 | 3 | 8 | 4 | 0 | 4 | 5 |
Sum = 50 · next multiple of 10 = 50 · check digit = 0 · actual last digit = 0
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.