DR. JOHN CHAN MD
NPI 1841503125
Internal Medicine in Torrance, CA
About Dr. John Chan Md NPPES
Official registry information on file with the National Plan and Provider Enumeration System.
DR. JOHN CHAN MD (NPI 1841503125) is an individual internal medicine provider in Torrance, California, licensed in California (A121533) and active in the NPI registry since July 2010. He is enrolled in Medicare PECOS and maintains a secondary practice location in Los Angeles.
NPPES Registry Identity
Specialties & Licenses
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 (PECOS)
Dr. John Chan Md is registered in the CMS Provider Enrollment, Chain and Ownership System (PECOS).
Medicare Billing Reassignment
Medicare enrollment records show John Chan reassigns Medicare billing to 1 organization. The organization bills Medicare for the services this provider delivers there.
Los Angeles, CA 90015
- Reassigned Medicare billing, California enrollment
- 2,052 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 90505 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 John Chan's NPI number?
The NPI number for John Chan is 1841503125. It was assigned to this individual provider in the NPPES registry on July 15, 2010.
Where is John Chan located?
John Chan practices at 3330 Lomita Blvd, Torrance, CA 90505. The listed phone number is (310) 214-0811.
What is John Chan's specialty?
The primary specialty registered for this NPI is Internal Medicine with taxonomy code 207R00000X.
Is John Chan enrolled in Medicare?
Yes. John Chan is registered in the Medicare PECOS enrollment system.
Which organization bills Medicare for John Chan's services?
According to the CMS Revalidation Reassignment List (October 2026 release), John Chan reassigns Medicare benefits to Healthcare Partners Affiliates Medical Group (Los Angeles, 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 John Chan'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 John Chan was last updated on December 7, 2025. NPI Profile syncs weekly with the NPPES registry data releases published by CMS. This NPI record was last updated 10 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.
# Dr. John Chan, MD · NPI 1841503125
Internal Medicine physician in Torrance, California. Individual provider, active in the CMS NPPES registry since July 15, 2010.
## Identity
- **NPI:** 1841503125 (Entity type: Individual)
- **Enumerated:** July 15, 2010
- **Primary specialty:** Internal Medicine · taxonomy 207R00000X
- **State license:** A121533 (California)
- **Sole proprietor:** No
## Practice location
- **Address:** 3330 LOMITA BLVD, Torrance, CA 90505-5002
- **Phone:** (310) 214-0811
## 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:** Healthcare Partners Affiliates Medical Group (NPI 1659312593, Los Angeles, CA), under Medicare reassignment (form CMS-855R) · CMS Revalidation Reassignment List, October 2026 release
## Record status
- **NPPES last updated:** December 7, 2025
---
Source: [NPI Profile](https://npiprofile.com/npi/1841503125) · Data from the CMS NPPES public registry.