HOLLY DIEU M.D.
NPI 1184155285
Internal Medicine in Santa Monica, CA
About Holly Dieu M.d. NPPES
Official registry information on file with the National Plan and Provider Enumeration System.
HOLLY DIEU M.D. (NPI 1184155285) is an individual internal medicine provider in Santa Monica, California, licensed in California (A159955) and active in the NPI registry since March 2017. She is enrolled in Medicare PECOS, maintains a secondary practice location in Santa Monica, and is a graduate of Other (2017).
NPPES Registry Identity
Specialties & Licenses 2
Secondary Practice Location 1
Medicare Participation & PECOS CMS
Medicare enrollment, assignment, billing reassignment, and ordering and referring status from CMS.
Medicare Enrollment Status
Enrolled in Medicare and accepts Medicare assignment
Holly Dieu M.d. is registered in PECOS and agrees to accept the Medicare-approved amount as full payment. Medicare patients are not billed beyond the standard deductible and coinsurance.
Medicare Billing Reassignments
5Medicare enrollment records show Holly Dieu reassigns Medicare billing to 5 organizations. Each organization bills Medicare for the services this provider delivers there; the nearest is listed first.
Santa Monica, CA 90404
- Reassigned Medicare billing, California enrollment
- 57 clinicians in this Medicare group
Los Angeles, CA 90095
- Reassigned Medicare billing, California enrollment
- 1,766 clinicians in this Medicare group
Glendale, CA 91201
- Reassigned Medicare billing, California enrollment
- 273 clinicians in this Medicare group
Los Angeles, CA 90059
- Reassigned Medicare billing, California enrollment
- 198 clinicians in this Medicare group
Los Angeles, CA 90059
- Reassigned Medicare billing, California enrollment
- 554 clinicians in this Medicare group
Source: CMS Revalidation Reassignment List, October 2026 release. Reassignment records can lag staffing changes; confirm a current affiliation with the organization.
Areas of Expertise CMS Part B claims 8
Services this provider delivered to Medicare fee-for-service patients, from the CMS Medicare utilization data. Higher counts generally reflect more experience with a service; care delivered outside Medicare is not included.
Physician Visit Costs CMS claims · ZIP area
Typical Medicare office-visit costs in the 90404 ZIP code area, from fee-for-service claims. These are area statistics, not this provider’s prices; actual charges vary by service and coverage.
Frequently Asked Questions NPPES & CMS
Common questions about this NPI record, answered from the official NPPES registry and CMS datasets shown on this page.
What is Holly Dieu's NPI number?
The NPI number for Holly Dieu is 1184155285. It was assigned to this individual provider in the NPPES registry on March 21, 2017.
Where is Holly Dieu located?
Holly Dieu practices at 1250 16th St Ste 125, Santa Monica, CA 90404. The listed phone number is (310) 315-8900.
What is Holly Dieu's specialty?
The primary specialty registered for this NPI is Internal Medicine with taxonomy code 207R00000X.
Is Holly Dieu enrolled in Medicare?
Yes. Holly Dieu is registered in the Medicare PECOS system and accepts Medicare assignment, which means accepting the Medicare-approved amount as payment in full for covered services.
Which organizations bill Medicare for Holly Dieu's services?
According to the CMS Revalidation Reassignment List (October 2026 release), Holly Dieu reassigns Medicare benefits to 5 organizations: Regents University Of California (Santa Monica, CA), The Regents Of The University Of California (Los Angeles, CA), Regents Of The University Of California (Glendale, CA), Superior Hospitalist Medical Group Inc (Los Angeles, CA) and Martin Luther King Jr Community Medical Foundation (Los Angeles, CA). Each reassignment is filed with Medicare on form CMS-855R, signed by both the clinician and the organization, and lets the organization bill Medicare and receive payment for Holly Dieu's services. Reassignment records can lag staffing changes; confirm current arrangements with the organization.
When was this NPI record last updated?
The NPPES record for Holly Dieu was last updated on January 13, 2023. NPI Profile syncs weekly with the NPPES registry data releases published by CMS. This NPI record was last updated 3 years ago. If this record has changed at CMS more recently, you can request an on-demand re-check against the live CMS registry, directly from this page.
# Holly Dieu, M.D. · NPI 1184155285
Internal Medicine physician in Santa Monica, California. Individual provider, active in the CMS NPPES registry since March 21, 2017.
## Identity
- **NPI:** 1184155285 (Entity type: Individual)
- **Enumerated:** March 21, 2017
- **Primary specialty:** Internal Medicine · taxonomy 207R00000X
- **State license:** A159955 (California)
- **Sole proprietor:** No
## Practice location
- **Address:** 1250 16TH ST STE 125, Santa Monica, CA 90404-1249
- **Phone:** (310) 315-8900 · **Fax:** (310) 315-8902
## Medicare
- **Medicare:** Enrolled (PECOS); accepts Medicare assignment
- **Ordering & referring:** eligible for Part B labs & imaging, durable medical equipment, home health, power mobility devices
- **Bills Medicare through:** 5 organizations under Medicare reassignment (form CMS-855R): Regents University Of California (NPI 1710287297, Santa Monica, CA); The Regents Of The University Of California (NPI 1235107566, Los Angeles, CA); Regents Of The University Of California (NPI 1891110888, Glendale, CA); Superior Hospitalist Medical Group Inc (NPI 1780047712, Los Angeles, CA); Martin Luther King Jr Community Medical Foundation (NPI 1356899777, Los Angeles, CA) · CMS Revalidation Reassignment List, October 2026 release
- **Medical school:** Other, class of 2017
## Record status
- **NPPES last updated:** January 13, 2023
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Source: [NPI Profile](https://npiprofile.com/npi/1184155285) · Data from the CMS NPPES public registry.