DR. ALAN T CHIEM MD, MPH
NPI 1477716967
Emergency Medicine in Sylmar, CA
About Dr. Alan T Chiem Md, Mph NPPES
Official registry information on file with the National Plan and Provider Enumeration System.
DR. ALAN T CHIEM MD, MPH (NPI 1477716967) is an individual emergency medicine provider in Sylmar, California, licensed in California (A116121) and active in the NPI registry since July 2008. He is enrolled in Medicare PECOS.
NPPES Registry Identity
Specialties & Licenses
Medicare Participation & PECOS CMS
Medicare enrollment, assignment, billing reassignment, and ordering and referring status from CMS.
Medicare Enrollment Status
Enrolled in Medicare (PECOS)
Dr. Alan T Chiem Md, Mph is registered in the CMS Provider Enrollment, Chain and Ownership System (PECOS).
Medicare Billing Reassignment
Medicare enrollment records show Alan Chiem reassigns Medicare billing to 1 organization. The organization bills Medicare for the services this provider delivers there.
Sylmar, CA 91342
- Reassigned Medicare billing, California enrollment
- Medicare enrollment name: County Of Los Angeles
- 1,939 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.
Physician Visit Costs CMS claims · ZIP area
Typical Medicare office-visit costs in the 91342 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.
SYLMAR, CA 91342
SYLMAR, CA 91342
SYLMAR, CA 91342
SYLMAR, CA 91342
SYLMAR, CA 91342
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 Alan Chiem's NPI number?
The NPI number for Alan Chiem is 1477716967. It was assigned to this individual provider in the NPPES registry on July 6, 2008.
Where is Alan Chiem located?
Alan Chiem practices at 14445 Olive View Dr Olive View-Ucla Emergency Medicine, Sylmar, CA 91342. The listed phone number is (818) 364-3107.
What is Alan Chiem's specialty?
The primary specialty registered for this NPI is Emergency Medicine with taxonomy code 207P00000X.
Is Alan Chiem enrolled in Medicare?
Yes. Alan Chiem is registered in the Medicare PECOS enrollment system.
Which organization bills Medicare for Alan Chiem's services?
According to the CMS Revalidation Reassignment List (October 2026 release), Alan Chiem reassigns Medicare benefits to County Of Los Angeles Auditor Controller (Sylmar, 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 Alan Chiem'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 Alan Chiem was last updated on March 23, 2015. NPI Profile syncs weekly with the NPPES registry data releases published by CMS. This NPI record was last updated 11 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. Alan T Chiem, MD, MPH · NPI 1477716967
Emergency Medicine physician in Sylmar, California. Individual provider, active in the CMS NPPES registry since July 6, 2008.
## Identity
- **NPI:** 1477716967 (Entity type: Individual)
- **Enumerated:** July 6, 2008
- **Primary specialty:** Emergency Medicine · taxonomy 207P00000X
- **State license:** A116121 (California)
- **Sole proprietor:** No
## Practice location
- **Address:** 14445 OLIVE VIEW DR, OLIVE VIEW-UCLA EMERGENCY MEDICINE, Sylmar, CA 91342-1437
- **Phone:** (818) 364-3107
## 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:** County Of Los Angeles Auditor Controller (NPI 1134159320, Sylmar, CA), under Medicare reassignment (form CMS-855R) · CMS Revalidation Reassignment List, October 2026 release
## Record status
- **NPPES last updated:** March 23, 2015
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Source: [NPI Profile](https://npiprofile.com/npi/1477716967) · Data from the CMS NPPES public registry.