DEREK Q PHAN MD
NPI 1598184244
Internal Medicine - Cardiovascular Disease in Temescal Valley, CA
About Derek Q Phan Md NPPES
Official registry information on file with the National Plan and Provider Enumeration System.
DEREK Q PHAN MD (NPI 1598184244) is an individual cardiovascular disease provider in Temescal Valley, California, licensed in Wisconsin (100522) and active in the NPI registry since April 2014. He is enrolled in Medicare PECOS, maintains 3 additional practice locations, and is a graduate of Other (2014).
NPPES Registry Identity
Specialties & Licenses 3
Secondary Practice Locations 3
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
Derek Q Phan Md 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
2Medicare enrollment records show Derek Phan reassigns Medicare billing to 2 organizations. Each organization bills Medicare for the services this provider delivers there; the nearest is listed first.
Riverside, CA 92506
- Reassigned Medicare billing, California enrollment
- 349 clinicians in this Medicare group
Anaheim, CA 92807
- Reassigned Medicare billing, California enrollment
- 13,921 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 2
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 92883 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 Derek Phan's NPI number?
The NPI number for Derek Phan is 1598184244. It was assigned to this individual provider in the NPPES registry on April 9, 2014.
Where is Derek Phan located?
Derek Phan practices at 21634 Retreat Pkwy, Temescal Valley, CA 92883. The listed phone number is (951) 493-6650.
What is Derek Phan's specialty?
The primary specialty registered for this NPI is Internal Medicine, specializing in Cardiovascular Disease, with taxonomy code 207RC0000X.
Is Derek Phan enrolled in Medicare?
Yes. Derek Phan 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 Derek Phan's services?
According to the CMS Revalidation Reassignment List (October 2026 release), Derek Phan reassigns Medicare benefits to 2 organizations: Riverside Medical Clinic, Inc (Riverside, CA) and Southern California Permanente Medical Group (Anaheim, 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 Derek Phan'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 Derek Phan was last updated on July 31, 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.
# Derek Q Phan, MD · NPI 1598184244
Cardiovascular Disease physician in Temescal Valley, California. Individual provider, active in the CMS NPPES registry since April 9, 2014.
## Identity
- **NPI:** 1598184244 (Entity type: Individual)
- **Enumerated:** April 9, 2014
- **Primary specialty:** Internal Medicine - Cardiovascular Disease · taxonomy 207RC0000X
- **State license:** 100522 (Wisconsin)
- **Sole proprietor:** Yes
## Practice location
- **Address:** 21634 RETREAT PKWY, Temescal Valley, CA 92883-6100
- **Phone:** (951) 493-6650
## 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:** 2 organizations under Medicare reassignment (form CMS-855R): Riverside Medical Clinic, Inc (NPI 1730180415, Riverside, CA); Southern California Permanente Medical Group (NPI 1952333460, Anaheim, CA) · CMS Revalidation Reassignment List, October 2026 release
- **Medical school:** Other, class of 2014
## Record status
- **NPPES last updated:** July 31, 2023
---
Source: [NPI Profile](https://npiprofile.com/npi/1598184244) · Data from the CMS NPPES public registry.