Maria Estrada
Maria Estrada is a Gastroenterology Registered Nurse in Los Angeles, CA, registered under NPI 1003339276.
Getting there
Here is what surrounds this office in Los Angeles, based on OpenStreetMap data collected Sep 19, 2026. Parking is available about 987 ft away. The nearest transit stop is 315 ft away, served by Marengo & State. If you arrive early, there is a coffee shop 0.28 mi away.
Getting here and what is nearby
Restaurant Rollup Teriyaki 0.00 mi ~1 min
1983 Marengo Street, Los Angeles 90033
Mo-Fr 13:00-20:00
Transit Marengo & Brittania 187 ft ~1 min
Transit Marengo & State 302 ft ~2 min
Transit Marengo & State 315 ft ~2 min
Convenience 7-Eleven 345 ft ~2 min
Parking P9 LA General MC Parking Structure 355 ft ~2 min
Restaurant Popeyes 353 ft ~2 min
2000 Marengo Street, Los Angeles 90033
08:00-24:00
Restaurant Subway 371 ft ~2 min
2000 Marengo Street, Los Angeles 90033
Mo-Fr 07:00-01:00; Sa-Su 09:00-01:00
Gas station 76 486 ft ~2 min
Parking P5 LA General MC Visitor Parking 695 ft ~3 min
Parking 987 ft ~4 min
Coffee Starbucks 0.28 mi ~6 min
Gas station Chevron 0.40 mi ~8 min
Gas station Chevron 0.41 mi ~9 min
Convenience Mobil Mart 0.44 mi ~9 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 |
|---|---|---|
| 559722 | CA | Gastroenterology Registered Nurse primary |
This provider holds licence 559722 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 Gastroenterology covers
Definition to come... NUCC Health Care Provider Taxonomy, code 163WG0100X
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 | 1003339276 valid check digit |
|---|---|
| Entity type | Individual (NPI-1) |
| Enumeration date | Jul 19, 2017 |
| Last updated | Jul 21, 2022 |
| Status | Active |
| Sole proprietor | No |
| Gender | Female |
| Practice address |
1983 MARENGO ST Los Angeles, CA 90033 (323) 409-7974 |
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 | 3 | 9 | 2 | 7 |
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
| Doubled? | — | ×2 | — | ×2 | — | ×2 | — | ×2 | — | ×2 | — | ×2 | — | ×2 |
| Value | 8 | 0 | 8 | 8 | 0 | 2 | 0 | 0 | 3 | 6 | 3 | 9 | 2 | 5 |
Sum = 54 · next multiple of 10 = 60 · check digit = 6 · actual last digit = 6
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.