Marilen E. Loo, NP-BC
- Part D claims, 2024
- 1,829
- Hospital affiliations
- 1
- Medical group
- 1
- State license
- 1
- Year NPI issued
- 2015
- Practice address
- 9961 Sierra Ave, Fontana, CA 92335
- Practice phone
- Call (909) 427-5000
- Professional email
- Get professional email
- Personal email
- Get personal email
- Mobile number
- Get mobile number
Primary practice
Find Marilen Loo's professional email, personal email and mobile number
Dmand AI checks each channel through healthcare-specific waterfall enrichment. See what is on file with a free account, with practice phones, licenses and affiliations.
Marilen E. Loo is a family nurse practitioner in Fontana, California
Marilen Loo practices at Fontana Medical Center in Fontana, California, part of Kaiser Permanente.
Marilen Loo's NPI, 1891165155, was assigned on September 30, 2015. Marilen Loo holds California license NP95002714.
- NPI
- 1891165155NPI Registry (opens in a new tab)
- Medicare PAC ID
- 1850684218
- NPI enumeration date
- September 30, 2015
- NPI status
- Active
- Accepts Medicare assignment
- Yes
- Practice phone
- (909) 427-5000
- Professional email
- Get email
- Personal email
- Get email
- Mobile number
- Get number
- Sex
- Female
- Estimated age
- 37
- Medical school graduation
- 2015
Sources: NPPES NPI Registry (CMS); Dmand AI Professional Profile Data; Dmand AI Affiliation Data; and Doctors and Clinicians National Downloadable File (CMS)
Marilen E. Loo practices at Fontana Medical Center in Fontana, California
Marilen Loo's primary practice is Fontana Medical Center, at 9961 Sierra Ave, Fontana, CA 92335 in San Bernardino County. The practice phone is (909) 427-5000.
- Fontana Medical Center9961 Sierra Ave, Fontana, CA 92335 · San Bernardino CountyPhone(909) 427-5000
Source: Dmand AI Affiliation Data
Marilen E. Loo is affiliated with 2 sites of care and 1 medical group
Marilen Loo's primary practice is Fontana Medical Center in Fontana, California, part of Kaiser Permanente. The medical group on file is Southern California Permanente Medical Group. Dmand AI also links Marilen Loo to 1 more group practice or clinic, named with a free account.
Sources: Dmand AI Affiliation Data; and Dmand AI Org Hierarchy Data
Dmand AI tracks the EHR system at Marilen E. Loo's practice
Dmand AI tracks the electronic health record (EHR) system at each site where Marilen Loo practices, 2 sites in all. Vendor and product names are available with a free account.
| Site | EHR vendor and product |
|---|---|
| Fontana Medical Center | Available with a free account |
| +1 more affiliated site | Available with a free account |
Source: Dmand AI Technology Install Data
For health IT teams
Dmand AI maps EHR vendors, IT decision makers and buying committees across Kaiser Permanente and 6.2K+ hospitals, with verified contacts in the same login.
Marilen E. Loo is one of 13,532 family nurse practitioners in California
Family is Marilen Loo's primary specialty in the NPI Registry, under taxonomy code 363LF0000X. Marilen Loo is licensed in California.
Specialties and state licenses
- Family nurse practitioner, CaliforniaPrimary
Family nurse practitioners near Marilen Loo
Counts of family nurse practitioners with a Dmand AI profile, by place and practice. Each opens the list.
Sources: NPPES NPI Registry (CMS); Dmand AI Professional Profile Data; and Dmand AI Peer Benchmarks
Marilen E. Loo's patients have a median age of 37
Across all payers, Dmand AI patient panel data puts Marilen Loo's median patient age at 37, with 72% women.
Marilen Loo's patients across all payers
Dmand AI patient panel data covers Medicare, Medicaid and commercial patients.
Patient panel by age, all payers
Median age 37
Patient panel by sex, all payers
- Women72%
- Men28%
Source: Dmand AI Patient Panel Data
Marilen E. Loo wrote 1,829 Medicare Part D claims in 2024
In 2024, Marilen Loo wrote 1,829 Medicare Part D claims for 625 patients. 97% of them were for generic drugs. CMS names the drug for 1,528 of them, across 38 drugs with 11 or more claims each, at $19,756 in total drug cost.
Marilen Loo's Part D claims by kind of drug, 2024
- Generic1,773 claims97%
- Brand-name56 claims3%
Marilen Loo's most prescribed drugs by claims, 2024
CMS names a drug when it has 11 or more claims. Share is of the claims for drugs CMS names.
Drug classes CMS tracks in Marilen Loo's Part D claims, 2024
- Antibiotics10%184 of 1,829 claims
Share of all Part D claims for each drug class CMS reports on. Classes with no claims are left out.
Sources: Medicare Part D Prescribers - by Provider and Drug (CMS), 2024 data, released May 6, 2026; and Medicare Part D Prescribers - by Provider (CMS), 2024 data
How Marilen E. Loo takes part in Medicare
Marilen Loo accepts Medicare assignment, so Medicare's approved amount is taken as full payment.
- Accepts Medicare assignment
- Yes
Source: Doctors and Clinicians National Downloadable File (CMS)
For MedTech and pharma teams
Filter 7.4M+ HCPs by Medicare procedures, Part D drugs and Open Payments history, then reach them with verified contacts in one login.
Sources for Marilen E. Loo's profile data
| Data on this page | Source |
|---|---|
| NPI, name, sex, specialty and licenses | NPPES NPI Registry (CMS) (opens in a new tab)Dmand AI Professional Profile Data |
| Practice locations and phone | Dmand AI Affiliation Data |
| Primary practice, affiliations and health system | Dmand AI Affiliation DataDmand AI Org Hierarchy Data |
| Medicare patients and the all-payer patient panel | Dmand AI Patient Panel Data |
| Part D prescribing | Medicare Part D Prescribers - by Provider and Drug (CMS) (opens in a new tab)Medicare Part D Prescribers - by Provider (CMS) (opens in a new tab) |
| MIPS scores, telehealth, assignment and procedure percentiles | Doctors and Clinicians National Downloadable File (CMS) (opens in a new tab) |
| EHR at each practice site | Dmand AI Technology Install Data |
| Similar physicians | Dmand AI Affiliation Data |
Data last refreshed October 2026Report an inaccuracyRemove my information
FAQ
Frequently asked questions about Marilen E. Loo
Spotted something out of date? Email hello@dmand.ai and we will check the record. Contact details live in the free trial.
What is Marilen E. Loo's NPI number?
Marilen E. Loo's NPI number is 1891165155. It was assigned on September 30, 2015, and it is active in the NPI Registry.
What does Marilen E. Loo specialize in?
Marilen E. Loo is a family nurse practitioner in Fontana, California. The primary specialty in the NPI Registry is Family Nurse Practitioner (taxonomy code 363LF0000X).
Where does Marilen E. Loo practice?
Marilen Loo practices at 9961 Sierra Ave, Fontana, CA 92335. Marilen Loo's primary practice is Fontana Medical Center in Fontana, California, part of Kaiser Permanente. Dmand AI also links Marilen Loo to 1 group practice or clinic.
What is Marilen E. Loo's office phone number?
The practice phone on file for Marilen Loo is (909) 427-5000.
What is Marilen E. Loo's medical license number?
Marilen Loo holds California license NP95002714.
Which hospitals is Marilen E. Loo affiliated with?
Marilen Loo practices at Fontana Medical Center in Fontana, California.
What medical group is Marilen E. Loo part of?
Marilen Loo is linked to Southern California Permanente Medical Group.
Does Marilen E. Loo accept Medicare?
Yes. CMS lists Marilen Loo as accepting Medicare assignment.
What drugs does Marilen E. Loo prescribe most?
In 2024 Medicare Part D data, Marilen Loo's most prescribed drugs by claims were Azelastine HCl, Losartan Potassium and Amlodipine Besylate.
How long has Marilen E. Loo been practicing?
Marilen Loo graduated from medical school in 2015, 11 years ago.
Selling to family practices?
See family nurse practitioners in California by site of care and group
Find the practices, groups and hospitals they work with, and the right people to contact at each.
- 30 days free
- Self-serve
- No credit card