Marilen Loo, NP-BC
NPI 1891165155 · Family Nurse Practitioner · Murrieta, CA
Enrolled with Medicare as Practitioner - Nurse Practitioner · source: CMS PECOS Public Provider Enrollment (2026.04.01)
Marilen Loo, NP-BC is a Family Nurse Practitioner provider in Murrieta, CA (NPI 1891165155).
Provider details
- NPI number
- 1891165155
- Entity type
- Individual
- Primary specialty
- Family Nurse PractitionerPhysician Assistants & Advanced Practice Nursing Providers
- Credential
- NP-BC
- Sex
- Female
- Sole proprietor
- No
- License
- NP95002714 (CA)
Specialties & taxonomies
Physician Assistants & Advanced Practice Nursing Providers
Profile Score
A profile completeness & documented-activity index — NOT a quality, outcomes, or patient-satisfaction rating.
- Registry tenure38% of score
10 yrs in NPPES registry
- Profile completeness38% of score
100% of core fields populated
- Practice footprint23% of score
1 documented practice location
Signals a provider has no public data for (e.g. Medicare claims) are left out of the score entirely — never counted as zero — so providers without that data are not penalized. See the full formula and weights in our methodology.
What this provider prescribes (Medicare Part D)
Top drugs by Medicare Part D claim volume, 2024 · 38 distinct drugs on file.
| Drug | Part D claims (2024) | Beneficiaries |
|---|---|---|
| Azelastine Hcl | 206 | 113 |
| Losartan Potassium | 176 | 66 |
| Amlodipine Besylate | 137 | 48 |
| Lisinopril | 84 | 35 |
| Prednisone | 81 | 78 |
| Lisinopril/Hydrochlorothiazidebrand: Lisinopril-Hydrochlorothiazide | 74 | 27 |
| Atenolol | 47 |
Practice location
Mailing address
Registry dates
- Enumerated
- 2015-09-30
- Last updated
- 2021-12-01
Frequently asked questions
- What is Marilen Loo's NPI number?
- Marilen Loo's National Provider Identifier (NPI) is 1891165155, a unique 10-digit ID issued by CMS for use in standard healthcare transactions.
- What is Marilen Loo's specialty?
- Marilen Loo is listed in the NPPES registry with a primary specialty of Family Nurse Practitioner (Physician Assistants & Advanced Practice Nursing Providers).
- Where is Marilen Loo located?
- Marilen Loo's practice location on file with NPPES is 41880 Kalmia St, Murrieta, CA 92562-8831.
- What is Marilen Loo's phone number?
- The practice phone number listed in the NPPES registry for Marilen Loo is (951) 461-6963.
- Does Marilen Loo accept Medicare?
- Marilen Loo is approved to bill Medicare according to CMS PECOS enrollment data (2026.04.01). Confirm current participation with the provider before scheduling.
- Is Marilen Loo's NPI active?
- Yes — Marilen Loo's NPI (1891165155) is active in the NPPES registry as of the last update on 2021-12-01.
Source: CMS NPPES Data Dissemination (June 2026). NPI Central is not affiliated with CMS. Data is provided as-is from the public registry.