DR. ALLEN CHANG MD
NPI 1588976567
Emergency Medicine in Tracy, CA
About Dr. Allen Chang Md NPPES
Official registry information on file with the National Plan and Provider Enumeration System.
DR. ALLEN CHANG MD (NPI 1588976567) is an individual emergency medicine provider in Tracy, California, licensed in California (C143700) and active in the NPI registry since July 2010. He is enrolled in Medicare PECOS, maintains a secondary practice location in San Jose, and is a graduate of Albert Einstein College Of Medicine Of Yeshiva University (2010).
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
Dr. Allen Chang 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
3Medicare enrollment records show Allen Chang reassigns Medicare billing to 3 organizations. Each organization bills Medicare for the services this provider delivers there; the nearest is listed first.
Tracy, CA 95376
- Reassigned Medicare billing, California enrollment
- 57 clinicians in this Medicare group
Stockton, CA 95210
- Reassigned Medicare billing, California enrollment
- 20,078 clinicians in this Medicare group
Milpitas, CA 95035
- Reassigned Medicare billing, California enrollment
- Also billed through NPI 1043354020 (California), NPI 1629301346 (California)
- 2,460 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
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 95376 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 Allen Chang's NPI number?
The NPI number for Allen Chang is 1588976567. It was assigned to this individual provider in the NPPES registry on July 8, 2010.
Where is Allen Chang located?
Allen Chang practices at 1420 N Tracy Blvd, Tracy, CA 95376. The listed phone number is (209) 835-1500.
What is Allen Chang's specialty?
The primary specialty registered for this NPI is Emergency Medicine with taxonomy code 207P00000X.
Is Allen Chang enrolled in Medicare?
Yes. Allen 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 Allen Chang's services?
According to the CMS Revalidation Reassignment List (October 2026 release), Allen Chang reassigns Medicare benefits to 3 organizations: Altamont Emergency Physicians Medical Group Inc (Tracy, CA), Permanente Medical Group Inc (Stockton, CA) and County Of Santa Clara (Milpitas, 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 Allen 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 Allen Chang was last updated on October 1, 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. Allen Chang, MD · NPI 1588976567
Emergency Medicine physician in Tracy, California. Individual provider, active in the CMS NPPES registry since July 8, 2010.
## Identity
- **NPI:** 1588976567 (Entity type: Individual)
- **Enumerated:** July 8, 2010
- **Primary specialty:** Emergency Medicine · taxonomy 207P00000X
- **State license:** C143700 (California)
- **Sole proprietor:** Yes
## Practice location
- **Address:** 1420 N TRACY BLVD, Tracy, CA 95376-3451
- **Phone:** (209) 835-1500
## 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:** 3 organizations under Medicare reassignment (form CMS-855R): Altamont Emergency Physicians Medical Group Inc (NPI 1952392375, Tracy, CA); Permanente Medical Group Inc (NPI 1548343510, Stockton, CA); County Of Santa Clara (NPI 1285629899, Milpitas, CA) · CMS Revalidation Reassignment List, October 2026 release
- **Medical school:** Albert Einstein College Of Medicine Of Yeshiva University, class of 2010
## Record status
- **NPPES last updated:** October 1, 2022
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Source: [NPI Profile](https://npiprofile.com/npi/1588976567) · Data from the CMS NPPES public registry.