STANFORD WELLINGTON CHUN MD
NPI 1104385475
Pediatrics - Pediatric Pulmonology in San Francisco, CA
About Stanford Wellington Chun Md NPPES
Official registry information on file with the National Plan and Provider Enumeration System.
STANFORD WELLINGTON CHUN MD (NPI 1104385475) is an individual pediatric pulmonology provider in San Francisco, California, licensed in California (A179155) and active in the NPI registry since March 2019. He is enrolled in Medicare PECOS and maintains 2 additional practice locations.
NPPES Registry Identity
Specialties & Licenses 2
Secondary Practice Locations 2
Medicare Participation & PECOS CMS
Medicare enrollment, assignment, billing reassignment, and ordering and referring status from CMS.
Medicare Enrollment Status
Enrolled in Medicare (PECOS)
Stanford Wellington Chun Md is registered in the CMS Provider Enrollment, Chain and Ownership System (PECOS).
Medicare Billing Reassignments
3Medicare enrollment records show Stanford Chun reassigns Medicare billing to 3 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
Source: CMS Revalidation Reassignment List, October 2026 release. Reassignment records can lag staffing changes; confirm a current affiliation with the organization.
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 94158
SAN FRANCISCO, CA 94158
SAN FRANCISCO, CA 94158
SAN FRANCISCO, CA 94158
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 Stanford Chun's NPI number?
The NPI number for Stanford Chun is 1104385475. It was assigned to this individual provider in the NPPES registry on March 17, 2019.
Where is Stanford Chun located?
Stanford Chun practices at 550 16th St Fl 4, San Francisco, CA 94158. The listed phone number is (415) 353-7337.
What is Stanford Chun's specialty?
The primary specialty registered for this NPI is Pediatrics, specializing in Pediatric Pulmonology, with taxonomy code 2080P0214X.
Is Stanford Chun enrolled in Medicare?
Yes. Stanford Chun is registered in the Medicare PECOS enrollment system.
Which organizations bill Medicare for Stanford Chun's services?
According to the CMS Revalidation Reassignment List (October 2026 release), Stanford Chun reassigns Medicare benefits to 3 organizations: Ucsf Pediatrics Associates (San Francisco, CA), University Of California San Francisco (San Francisco, CA) and Ucsf Medical Group Business Services (San Francisco, 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 Stanford Chun'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 Stanford Chun was last updated on August 1, 2025. NPI Profile syncs weekly with the NPPES registry data releases published by CMS. This NPI record was last updated 15 months 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.
# Stanford Wellington Chun, MD · NPI 1104385475
Pediatric Pulmonology physician in San Francisco, California. Individual provider, active in the CMS NPPES registry since March 17, 2019.
## Identity
- **NPI:** 1104385475 (Entity type: Individual)
- **Enumerated:** March 17, 2019
- **Primary specialty:** Pediatrics - Pediatric Pulmonology · taxonomy 2080P0214X
- **State license:** A179155 (California)
- **Sole proprietor:** No
## Practice location
- **Address:** 550 16TH ST FL 4, San Francisco, CA 94158-2604
- **Phone:** (415) 353-7337
## Medicare
- **Medicare:** Enrolled in Medicare (PECOS)
- **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): 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) · CMS Revalidation Reassignment List, October 2026 release
## Record status
- **NPPES last updated:** August 1, 2025
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Source: [NPI Profile](https://npiprofile.com/npi/1104385475) · Data from the CMS NPPES public registry.