IRENE JOAN CHANG M.D.
NPI 1033539671
Medical Genetics - Clinical Genetics (M.D.) in San Francisco, CA
About Irene Joan Chang M.d. NPPES
Official registry information on file with the National Plan and Provider Enumeration System.
IRENE JOAN CHANG M.D. (NPI 1033539671) is an individual clinical genetics (m.d.) provider in San Francisco, California, licensed in California (A186751) and active in the NPI registry since April 2014. She is enrolled in Medicare PECOS and is a graduate of Other (2014).
NPPES Registry Identity
Specialties & Licenses 2
Other Identifiers 1
Accepted Insurance
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
Irene Joan 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
4Medicare enrollment records show Irene Chang reassigns Medicare billing to 4 organizations. Each organization bills Medicare for the services this provider delivers there; the nearest is listed first.
San Francisco, CA 94143
- Reassigned Medicare billing, California enrollment
- 1,159 clinicians in this Medicare group
San Francisco, CA 94143
- Reassigned Medicare billing, California enrollment
- 5,645 clinicians in this Medicare group
San Francisco, CA 94122
- Reassigned Medicare billing, California enrollment
- 5,544 clinicians in this Medicare group
Richland, WA 99352
- Reassigned Medicare billing, Washington enrollment
- Medicare enrollment name: The Association Of Chrmc And University Physicians
- 1,443 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.
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.
SAN FRANCISCO, CA 94143
SAN FRANCISCO, CA 94143
SAN FRANCISCO, CA 94143
SAN FRANCISCO, CA 94143
SAN FRANCISCO, CA 94143
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 Irene Chang's NPI number?
The NPI number for Irene Chang is 1033539671. It was assigned to this individual provider in the NPPES registry on April 22, 2014.
Where is Irene Chang located?
Irene Chang practices at 1825 4th St Fl 6, San Francisco, CA 94143. The listed phone number is (415) 476-2757.
What is Irene Chang's specialty?
The primary specialty registered for this NPI is Medical Genetics, specializing in Clinical Genetics (M.D.), with taxonomy code 207SG0201X.
Is Irene Chang enrolled in Medicare?
Yes. Irene 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 Irene Chang's services?
According to the CMS Revalidation Reassignment List (October 2026 release), Irene Chang reassigns Medicare benefits to 4 organizations: Ucsf Pediatrics Associates (San Francisco, CA), University Of California San Francisco (San Francisco, CA), Ucsf Medical Group Business Services (San Francisco, CA) and Association Of Chmc And University Physicians (Richland, WA). 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 Irene Chang's services. Reassignment records can lag staffing changes; confirm current arrangements with the organization.
What insurance does Irene Chang accept?
Health plans from Providence Health Plan list Irene Chang as in-network in at least one marketplace plan. Coverage varies by plan and year; verify with the insurer or the provider before a visit.
When was this NPI record last updated?
The NPPES record for Irene Chang was last updated on August 29, 2024. NPI Profile syncs weekly with the NPPES registry data releases published by CMS. This NPI record was last updated 2 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.
# Irene Joan Chang, M.D. · NPI 1033539671
Clinical Genetics (M.D.) physician in San Francisco, California. Individual provider, active in the CMS NPPES registry since April 22, 2014.
## Identity
- **NPI:** 1033539671 (Entity type: Individual)
- **Enumerated:** April 22, 2014
- **Primary specialty:** Medical Genetics - Clinical Genetics (M.D.) · taxonomy 207SG0201X
- **State license:** A186751 (California)
- **Sole proprietor:** No
## Practice location
- **Address:** 1825 4TH ST FL 6, San Francisco, CA 94143-2350
- **Phone:** (415) 476-2757
## 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:** 4 organizations under Medicare reassignment (form CMS-855R): Ucsf Pediatrics Associates (NPI 1376614016, San Francisco, CA); University Of California San Francisco (NPI 1346329380, San Francisco, CA); Ucsf Medical Group Business Services (NPI 1477624104, San Francisco, CA); Association Of Chmc And University Physicians (NPI 1851680664, Richland, WA) · CMS Revalidation Reassignment List, October 2026 release
- **Medical school:** Other, class of 2014
## Record status
- **NPPES last updated:** August 29, 2024
- **Other identifiers:** Medicaid 1033539671 (WA)
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Source: [NPI Profile](https://npiprofile.com/npi/1033539671) · Data from the CMS NPPES public registry.