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ALEXANDER CHEN M.D.
NPI 1861556623
Psychiatry & Neurology - Child & Adolescent Psychiatry in San Francisco, CA

Active since December 19, 2006PECOS Enrolled
3801 3RD ST, STE 400, SAN FRANCISCO, CA 94124(415) 337-4784 Get Directions Write a Review

NPPES record last updated: May 22, 2026. Verified against the NPPES registry weekly; last sync: October 25, 2026.

About Alexander Chen M.d. NPPES

Official registry information on file with the National Plan and Provider Enumeration System.

ALEXANDER CHEN M.D. (NPI 1861556623) is an individual child & adolescent psychiatry provider in San Francisco, California, licensed in California (A78692) and active in the NPI registry since December 2006. He is enrolled in Medicare PECOS and maintains 13 additional practice locations.

NPPES Registry Identity

NPI1861556623
Entity TypeIndividualMale
Primary Taxonomy2084P0804X
Provider Legal NameALEXANDER CHENCredential: M.D.
Location Address3801 3RD ST, STE 400San Francisco, CA 94124-1409
Mailing Address3801 3rd St, Suite 400San Francisco, CA 94124-1409 · (415) 337-4784
Phone(415) 337-4784
Sole ProprietorYes
Enumeration DateDecember 19, 2006
Last NPPES UpdateMay 22, 2026
NPPES CertifiedMay 22, 2026
✔ NPI 1861556623 is a valid, active identifier and passes the ISO check-digit test.

Specialties & Licenses

★ Primary SpecialtyPsychiatry & Neurology · Child & Adolescent PsychiatryAllopathic & Osteopathic Physicians
Taxonomy Code2084P0804X
License✔ Licensed in CA · A78692
Definition
Child & Adolescent Psychiatry is a subspecialty of psychiatry with additional skills and training in the diagnosis and treatment of developmental, behavioral, emotional, and mental disorders of childhood and adolescence.
3801 3RD ST, San Francisco, CA 94124
Open in Google Maps ↗

Secondary Practice Locations 13

Location 13636 N 1st St, Suite 135, 154, 162Fresno, CA 93726-6818 · Phone (559) 476-2166
Location 2386 Coalinga PlzCoalinga, CA 93210-1704 · Phone (855) 343-1057
Location 3380 Coalinga PlzCoalinga, CA 93210-1704 · Phone (855) 343-1057
Location 4275 S Madera Ave Ste 404Kerman, CA 93630-1401 · Phone (855) 343-1057
Location 51311 11th StReedley, CA 93654-2926 · Phone (855) 343-1057
Location 63855 N West Ave,, 105, 108, 110Fresno, CA 93705-2759 · Phone (559) 334-6433
Location 71690 W Shaw Ave Ste 201Fresno, CA 93711-3519 · Phone (855) 343-1057
Location 8225 Academy AveSanger, CA 93657-2128 · Phone (855) 343-1057
Location 93400 McCall Ave Ste 104Selma, CA 93662-2560 · Phone (855) 343-1057
Location 103636 N 1st St Ste 124Fresno, CA 93726-6818 · Phone (855) 343-1057
Location 113467 W Shaw Ave Ste 101Fresno, CA 93711-3223 · Phone (559) 271-3096
Location 122731 W Olive AveFresno, CA 93728-2449 · Phone (559) 233-5096
Location 133636 N 1st St, Suite 112, 124Fresno, CA 93726-6818 · Phone (855) 343-1057

Medicare Participation & PECOS CMS

Medicare enrollment, assignment, billing reassignment, and ordering and referring status from CMS.

Medicare Enrollment Status

✔

Enrolled in Medicare (PECOS)

Alexander Chen M.d. is registered in the CMS Provider Enrollment, Chain and Ownership System (PECOS).

Eligible to Order & Refer✔ Part B Labs & Imaging✔ Durable Medical Equipment✔ Home Health Agency✔ Power Mobility DevicesPer the CMS Ordering and Referring file. Eligibility means Medicare pays claims that this provider orders or refers for these categories.

Medicare Billing Reassignment

Medicare enrollment records show Alexander Chen reassigns Medicare billing to 1 organization. The organization bills Medicare for the services this provider delivers there.

County Of Humboldt
230 mi
Community/Behavioral Health
720 WOOD ST
Eureka, CA 95501
  • Reassigned Medicare billing, California enrollment
  • 65 clinicians in this Medicare group
NPI 1033300306 (707) 268-2900

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.

CITY AND COUNTY OF SAN FRANCISCO
Clinic/Center (Mental Health (Including Community Mental Health Center))
3801 3RD ST, SUITE 400
SAN FRANCISCO, CA 94124
San Francisco County (415) 907-3875
CITY AND COUNTY OF SAN FRANCISCO
Community/Behavioral Health
3801 3RD ST, BUILDING B, SUITE 400
SAN FRANCISCO, CA 94124
San Francisco County (415) 970-3800
SAN FRANCISCO DEPARTMENT OF PUBLIC HEALTH
Counselor (Mental Health)
3801 3RD ST, BUILDING B, SUITE 400
SAN FRANCISCO, CA 94124
San Francisco County (415) 970-3800
MR. ROBERTO ELIGIO ALFARO JR.
Case Manager/Care Coordinator
3801 3RD ST
SAN FRANCISCO, CA 94124
San Francisco County (415) 970-3800
SAN FRANCISCO DEPARTMENT OF PUBLIC HEALTH
Social Worker (Clinical)
3801 3RD ST, 400
SAN FRANCISCO, CA 94124
San Francisco County (415) 970-3888
DR. CAROLINE SALVADOR-MOSES PSY.D.
Psychologist (Clinical)
3801 3RD ST, SUITE 400
SAN FRANCISCO, CA 94124
San Francisco County (415) 970-3853
FURU OUYANG
Specialist
3801 3RD ST, SUITE 400
SAN FRANCISCO, CA 94124
San Francisco County (415) 970-3898
VINCY WAI SEE CHOW LCSW
Social Worker (Clinical)
3801 3RD ST, SUITE 400
SAN FRANCISCO, CA 94124
San Francisco County (415) 970-3800

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 Alexander Chen's NPI number?

The NPI number for Alexander Chen is 1861556623. It was assigned to this individual provider in the NPPES registry on December 19, 2006.

Where is Alexander Chen located?

Alexander Chen practices at 3801 3rd St Ste 400, San Francisco, CA 94124. The listed phone number is (415) 337-4784.

What is Alexander Chen's specialty?

The primary specialty registered for this NPI is Psychiatry & Neurology, specializing in Child & Adolescent Psychiatry, with taxonomy code 2084P0804X.

Is Alexander Chen enrolled in Medicare?

Yes. Alexander Chen is registered in the Medicare PECOS enrollment system.

Which organization bills Medicare for Alexander Chen's services?

According to the CMS Revalidation Reassignment List (October 2026 release), Alexander Chen reassigns Medicare benefits to County Of Humboldt (Eureka, 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 Alexander Chen'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 Alexander Chen was last updated on May 22, 2026. NPI Profile syncs weekly with the NPPES registry data releases published by CMS. This NPI record was last updated 5 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.