DR. CHUN JOEY CHANG M.D.
NPI 1003015462
Emergency Medicine in Modesto, CA
About Dr. Chun Joey Chang M.d. NPPES
Official registry information on file with the National Plan and Provider Enumeration System.
DR. CHUN JOEY CHANG M.D. (NPI 1003015462) is an individual emergency medicine provider in Modesto, California, licensed in California (A106131) and active in the NPI registry since July 2007. He is enrolled in Medicare PECOS and is a graduate of University Of California, Geffen School Of Medicine (2006).
NPPES Registry Identity
Specialties & Licenses 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
Dr. Chun Joey Chang 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
17Medicare enrollment records show Chun Chang reassigns Medicare billing to 17 organizations. Each organization bills Medicare for the services this provider delivers there; the nearest is listed first.
Modesto, CA 95350
- Reassigned Medicare billing, California enrollment
- Also billed through NPI 1548216260 (California)
- 2,323 clinicians in this Medicare group
Tracy, CA 95376
- Reassigned Medicare billing, California enrollment
- 57 clinicians in this Medicare group
Vallejo, CA 94589
- Reassigned Medicare billing, California enrollment
- 43 clinicians in this Medicare group
San Francisco, CA 94133
- Reassigned Medicare billing, California enrollment
- 27 clinicians in this Medicare group
Delano, CA 93215
- Reassigned Medicare billing, California enrollment
- 301 clinicians in this Medicare group
Monterey Park, CA 91754
- Reassigned Medicare billing, California enrollment
- 80 clinicians in this Medicare group
Inglewood, CA 90301
- Reassigned Medicare billing, California enrollment
- 111 clinicians in this Medicare group
Monterey Park, CA 91754
- Reassigned Medicare billing, California enrollment
- 50 clinicians in this Medicare group
Huntington Park, CA 90255
- Reassigned Medicare billing, California enrollment
- 74 clinicians in this Medicare group
Victorville, CA 92395
- Reassigned Medicare billing, California enrollment
- 53 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 6
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 95351 ZIP code area, from fee-for-service claims. These are area statistics, not this provider’s prices; actual charges vary by service and coverage.
Medicare Quality Performance CMS QPP · MIPS
Performance in the CMS Quality Payment Program: the MIPS final score across four weighted categories, and the individual quality measures reported to Medicare.
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 Chun Chang's NPI number?
The NPI number for Chun Chang is 1003015462. It was assigned to this individual provider in the NPPES registry on July 16, 2007.
Where is Chun Chang located?
Chun Chang practices at 401 Paradise Rd #e, Modesto, CA 95351. The listed phone number is (209) 558-5107.
What is Chun Chang's specialty?
The primary specialty registered for this NPI is Emergency Medicine with taxonomy code 207P00000X.
Is Chun Chang enrolled in Medicare?
Yes. Chun Chang 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 Chun Chang's services?
According to the CMS Revalidation Reassignment List (October 2026 release), Chun Chang reassigns Medicare benefits to 17 organizations: Cep America - California (Modesto, CA), Altamont Emergency Physicians Medical Group Inc (Tracy, CA), Vallejo Emergency Physicians Medical Group Inc. (Vallejo, CA), California Emergency Associates A California Medical Corporation (San Francisco, CA), Team Physicians Of California Medical Group Inc (Delano, CA) and 12 more organizations, listed in the Medicare section above. 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 Chun Chang'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 Chun Chang was last updated on September 6, 2022. 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.
# Dr. Chun Joey Chang, M.D. · NPI 1003015462
Emergency Medicine physician in Modesto, California. Individual provider, active in the CMS NPPES registry since July 16, 2007.
## Identity
- **NPI:** 1003015462 (Entity type: Individual)
- **Enumerated:** July 16, 2007
- **Primary specialty:** Emergency Medicine · taxonomy 207P00000X
- **State license:** A106131 (California)
- **Sole proprietor:** No
## Practice location
- **Address:** 401 PARADISE RD, #E, Modesto, CA 95351-3163
- **Phone:** (209) 558-5107
## 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:** 17 organizations under Medicare reassignment (form CMS-855R): Cep America - California (NPI 1639124167, Modesto, CA); Altamont Emergency Physicians Medical Group Inc (NPI 1952392375, Tracy, CA); Vallejo Emergency Physicians Medical Group Inc. (NPI 1083916373, Vallejo, CA); California Emergency Associates A California Medical Corporation (NPI 1437611936, San Francisco, CA); Team Physicians Of California Medical Group Inc (NPI 1447288345, Delano, CA); and 12 more · CMS Revalidation Reassignment List, October 2026 release
- **Medical school:** University Of California, Geffen School Of Medicine, class of 2006
## Record status
- **NPPES last updated:** September 6, 2022
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Source: [NPI Profile](https://npiprofile.com/npi/1003015462) · Data from the CMS NPPES public registry.