Provider records sourced from NPPES (CMS National Plan & Provider Enumeration System). Data current as of August 10, 2026.
NPIDirectory

Dr. Louie-Marc Contreras

Individual provider Specialist · NPI 1629088661

Dr. Louie-Marc Contreras practises General Surgery in Valencia, California. Graduated from Loma Linda University School of Medicine in 1998, 28 years ago. Practices with Healthcare Partners Affiliates Medical Group, a 790-clinician group. Licensed in California.

Years since qualifying
28
Trained at
Loma Linda University School of Medicine
Licensed in
CA
In the registry since
2006
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Practice location Address checks out

25775 McBean Pkwy Ste 216
Valencia, CA 91355-3703 Not confirmed with CMS for 19 years — call before visiting
Phone: (310) 770-3033
Fax: (562) 291-1153
Show map & directions

Directions in Google Maps · Apple Maps · OpenStreetMap

Pin is approximate — placed at the ZIP-code centre, not the exact door.

Specialties & licences

Specialist (primary) Taxonomy 174400000X · Licence A72134 (CA)

Record details

NPI number1629088661
Entity typeIndividual (Type 1)
GenderMale
Sole proprietorYes
NPI enumeratedAugust 9, 2006
Last updated in NPPESJuly 8, 2007

Medicare enrollment

From the CMS Doctors & Clinicians file — this clinician is enrolled in Medicare.

Medicare specialtyGENERAL SURGERY
Medical schoolLOMA LINDA UNIVERSITY SCHOOL OF MEDICINE
Graduated 1998 (28 years in practice)
Group practice Healthcare Partners Affiliates Medical Group — 790 clinicians
Accepts Medicare assignment Not indicated
Practice locations4 on file with Medicare

Procedures

From CMS Care Compare, which counts the procedures a clinician billed to Original Medicare and Medicare Advantage over a recent 12-month period. CMS reports a fixed list of common procedures, so this is not everything the clinician does. Counts of 10 or fewer are given as a range, because CMS withholds small numbers.

Hernia repair (minimally invasive) 11 times · 73rd percentile
Colonoscopy 1–10 times
Hernia repair - groin (open) 1–10 times
Mastectomy 1–10 times
Removal of the uterus 1–10 times

The percentile compares how often this clinician performed the procedure with other clinicians who performed it, as CMS calculates it. It measures volume, not outcomes or skill.

Medicare patients and services, 2024

From the CMS Medicare Physician & Other Practitioners file for calendar year 2024. It counts Original Medicare patients only, so a practice that mostly sees Medicare Advantage or privately insured patients looks smaller here than it is.

Medicare patients189
Services billed 383 a service is one billed item, such as a visit, a test or a procedure
Average patient age75

Dollar amounts are not shown. What Medicare pays a practice is gross billings, before staff, premises and tax and including the cost of any drugs it administers, so it is not what a clinician earns.

Payments from drug and device companies, 2025

Drug and device makers are required by federal law (the Physician Payments Sunshine Act) to report what they pay or give to clinicians, and CMS publishes the reports as Open Payments. This is the 2025 program year. A report is a record of a payment, not an allegation of anything, and many are small items such as meals. Only general payments are listed here; research payments and ownership or investment interests are reported separately by CMS and are not shown.

Travel and Lodging $286 2 payments · travel or lodging paid or reimbursed, such as to attend a conference

Each amount is the sum of what companies reported for that kind of payment in 2025, rounded to the dollar. Not all of it is income to the clinician: a meal is not a fee, a charitable contribution goes to a charity, and a royalty or an acquisition payment is not a salary.

Check a report, or dispute one, at the source in CMS’s own tool, Open Payments. Corrections go through CMS’s dispute process. This site removes a home address on request and asks for no proof, because that is privacy; it will not remove an accurate payment report on request, because that is a statutory public disclosure.

Practises at

Facilities the CMS Facility Affiliation file lists for this clinician. Those with a page here are linked.

  • Henry Mayo Newhall Hospital Hospital · Valencia, CA · listed as Henry Mayo Newhall Memorial Hospital
  • Assisted Home Care Home health agency · Mission Hills, CA · listed as Assisted Home Care, Inc
  • Glendale Mem Hospital & Hlth Center Hospital · Glendale, CA

Colleagues at Healthcare Partners Affiliates Medical Group

Clinicians the CMS Doctors & Clinicians file lists under the same group practice. CMS counts 790 clinicians in the practice; 12 are shown here.

Other providers in Valencia