DAVID DUC DIEP DO
NPI 1750651485
Family Medicine in Ontario, CA
About David Duc Diep Do NPPES
Official registry information on file with the National Plan and Provider Enumeration System.
DAVID DUC DIEP DO (NPI 1750651485) is an individual family medicine provider in Ontario, California, licensed in California (20A12549) and active in the NPI registry since January 2012. He is enrolled in Medicare PECOS and is a graduate of Other (2011).
NPPES Registry Identity
Specialties & Licenses
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
David Duc Diep Do 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 Reassignment
Medicare enrollment records show David Diep reassigns Medicare billing to 1 organization. The organization bills Medicare for the services this provider delivers there.
Chino Hills, CA 91709
- Reassigned Medicare billing, California enrollment
- 5,228 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.
Physician Visit Costs CMS claims · ZIP area
Typical Medicare office-visit costs in the 91761 ZIP code area, from fee-for-service claims. These are area statistics, not this provider’s prices; actual charges vary by service and coverage.
Other Providers at the Same Location NPPES 20
Providers registered at the same practice address, or within the immediate area, according to the NPPES registry.
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 David Diep's NPI number?
The NPI number for David Diep is 1750651485. It was assigned to this individual provider in the NPPES registry on January 11, 2012.
Where is David Diep located?
David Diep practices at 2295 S Vineyard Ave Medical Office Building A - Family Medicine, Ontario, CA 91761. The listed phone number is (713) 835-6235.
What is David Diep's specialty?
The primary specialty registered for this NPI is Family Medicine with taxonomy code 207Q00000X.
Is David Diep enrolled in Medicare?
Yes. David Diep 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 organization bills Medicare for David Diep's services?
According to the CMS Revalidation Reassignment List (October 2026 release), David Diep reassigns Medicare benefits to Southern California Permanente Medical Group (Chino Hills, CA). The 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 David Diep'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 David Diep was last updated on December 3, 2021. NPI Profile syncs weekly with the NPPES registry data releases published by CMS. This NPI record was last updated 4 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.
# David Duc Diep, DO · NPI 1750651485
Family Medicine physician in Ontario, California. Individual provider, active in the CMS NPPES registry since January 11, 2012.
## Identity
- **NPI:** 1750651485 (Entity type: Individual)
- **Enumerated:** January 11, 2012
- **Primary specialty:** Family Medicine · taxonomy 207Q00000X
- **State license:** 20A12549 (California)
- **Sole proprietor:** No
## Practice location
- **Address:** 2295 S VINEYARD AVE, MEDICAL OFFICE BUILDING A - FAMILY MEDICINE, Ontario, CA 91761-7925
- **Phone:** (713) 835-6235
## 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:** Southern California Permanente Medical Group (NPI 1396287082, Chino Hills, CA), under Medicare reassignment (form CMS-855R) · CMS Revalidation Reassignment List, October 2026 release
- **Medical school:** Other, class of 2011
## Record status
- **NPPES last updated:** December 3, 2021
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Source: [NPI Profile](https://npiprofile.com/npi/1750651485) · Data from the CMS NPPES public registry.