DR. ANNA R CHANG M.D.
NPI 1568402931
Internal Medicine in Concord, CA
About Dr. Anna R Chang M.d. NPPES
Official registry information on file with the National Plan and Provider Enumeration System.
DR. ANNA R CHANG M.D. (NPI 1568402931) is an individual internal medicine provider in Concord, California, licensed in California (A69618) and active in the NPI registry since June 2006. She is enrolled in Medicare PECOS and is a graduate of University Of California, San Diego School Of Medicine (1998).
NPPES Registry Identity
Specialties & Licenses
Other Identifiers 4
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. Anna R 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 Reassignment
Medicare enrollment records show Anna Chang reassigns Medicare billing to 1 organization. The organization bills Medicare for the services this provider delivers there.
Walnut Creek, CA 94597
- Reassigned Medicare billing, California enrollment
- 650 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 11
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 94520 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.
Reported Quality Measures
Referred Medical Equipment & Supplies CMS DME claims 8
Durable medical equipment, devices and supplies this provider ordered from DME suppliers for patients, from Medicare fee-for-service claims.
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.
CONCORD, CA 94520
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 Anna Chang's NPI number?
The NPI number for Anna Chang is 1568402931. It was assigned to this individual provider in the NPPES registry on June 7, 2006.
Where is Anna Chang located?
Anna Chang practices at 2700 Grant St Suite 200, Concord, CA 94520. The listed phone number is (925) 687-8860.
What is Anna Chang's specialty?
The primary specialty registered for this NPI is Internal Medicine with taxonomy code 207R00000X.
Is Anna Chang enrolled in Medicare?
Yes. Anna 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 organization bills Medicare for Anna Chang's services?
According to the CMS Revalidation Reassignment List (October 2026 release), Anna Chang reassigns Medicare benefits to John Muir Physician Network (Walnut Creek, 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 Anna 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 Anna Chang was last updated on June 18, 2012. NPI Profile syncs weekly with the NPPES registry data releases published by CMS. This NPI record was last updated 14 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. Anna R Chang, M.D. · NPI 1568402931
Internal Medicine physician in Concord, California. Individual provider, active in the CMS NPPES registry since June 7, 2006.
## Identity
- **NPI:** 1568402931 (Entity type: Individual)
- **Enumerated:** June 7, 2006
- **Primary specialty:** Internal Medicine · taxonomy 207R00000X
- **State license:** A69618 (California)
- **Sole proprietor:** No
## Practice location
- **Address:** 2700 GRANT ST, SUITE 200, Concord, CA 94520-2266
- **Phone:** (925) 687-8860 · **Fax:** (925) 687-1570
## 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:** John Muir Physician Network (NPI 1841407665, Walnut Creek, CA), under Medicare reassignment (form CMS-855R) · CMS Revalidation Reassignment List, October 2026 release
- **Medical school:** University Of California, San Diego School Of Medicine, class of 1998
## Record status
- **NPPES last updated:** June 18, 2012
- **Other identifiers:** Medicare UPIN H40380 (CA); Medicare PIN P00368846 (CA); Medicare PIN 00A696181 (CA); and 1 more
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Source: [NPI Profile](https://npiprofile.com/npi/1568402931) · Data from the CMS NPPES public registry.