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Recently Updated NPI Information — some details in this NPI profile have been updated in the NPI registry within the last 60 days.

ALEJANDRA CLARK M.D
NPI 1821250358
Psychiatry & Neurology - Psychiatry in Upland, CA

Active since June 26, 2008PECOS EnrolledAccepts Medicare Assignment
820 N MOUNTAIN AVE STE 108, UPLAND, CA 91786(909) 749-1415 Get Directions Write a Review

NPPES record last updated: September 2, 2026. Verified against the NPPES registry weekly; last sync: October 18, 2026.

Record update history: Sep 2, 2026, Dec 2, 2021 (2 updates tracked since 2021).

About Alejandra Clark M.d NPPES

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

ALEJANDRA CLARK M.D (NPI 1821250358) is an individual psychiatry provider in Upland, California, licensed in California (A111861) and active in the NPI registry since June 2008. She is enrolled in Medicare PECOS and is a graduate of University Of Louisville School Of Medicine (2010).

NPPES Registry Identity

NPI1821250358
Entity TypeIndividualFemale
Primary Taxonomy2084P0800X
Provider Legal NameALEJANDRA CLARKCredential: M.D
Location Address820 N MOUNTAIN AVE STE 108Upland, CA 91786-4163
Mailing Address820 N Mountain Ave Ste 108Upland, CA 91786-4163 · (909) 749-1415
Phone(909) 749-1415
Sole ProprietorYes
Medical School CMSUniversity Of Louisville School Of MedicineGraduated 2010
Enumeration DateJune 26, 2008
Last NPPES UpdateSeptember 2, 20262 updates tracked since enumeration
NPPES CertifiedSeptember 2, 2026
✔ NPI 1821250358 is a valid, active identifier and passes the ISO check-digit test.

Specialties & Licenses

★ Primary SpecialtyPsychiatry & Neurology · PsychiatryAllopathic & Osteopathic Physicians
Taxonomy Code2084P0800X
License✔ Licensed in CA · A111861
Definition
A Psychiatrist specializes in the prevention, diagnosis, and treatment of mental disorders, emotional disorders, psychotic disorders, mood disorders, anxiety disorders, substance-related disorders, sexual and gender identity disorders and adjustment disorders. Biologic, psychological, and social components of illnesses are explored and understood in treatment of the whole person. Tools used may include diagnostic laboratory tests, prescribed medications, evaluation and treatment of psychological and interpersonal problems with individuals and families, and intervention for coping with stress, crises, and other problems.
820 N MOUNTAIN AVE STE 108, Upland, CA 91786
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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

Alejandra Clark 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.

PECOS PAC ID8224280417
PECOS Enrollment IDI20121217000101
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 Alejandra Clark reassigns Medicare billing to 1 organization. The organization bills Medicare for the services this provider delivers there.

Southern California Permanente Medical Group
7.4 mi
Clinical Medical Laboratory
13000 PEYTON DR
Chino Hills, CA 91709
  • Reassigned Medicare billing, California enrollment
  • 5,228 clinicians in this Medicare group
NPI 1396287082 (888) 750-0036

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 91786 ZIP code area, from fee-for-service claims. These are area statistics, not this provider’s prices; actual charges vary by service and coverage.

New Patient
$179.42 typical visit price
range $59.60 – $179.42
Typical copayment $44.85 (range $14.90 – $44.85)
Most-billed visit code 99205
Established Patient
$74.08 typical visit price
range $19.37 – $146.42
Typical copayment $18.52 (range $4.84 – $36.60)
Most-billed visit code 99213
Amounts reflect what Medicare beneficiaries in this ZIP area are typically charged for office visits. Patients with other coverage should check their individual plans.

Other Providers at the Same Location NPPES

Providers registered at the same practice address, or within the immediate area, according to the NPPES registry.

EDUARDO PINEDA MD, INC
Clinic/Center (Adult Mental Health)
820 N MOUNTAIN AVE STE 108
UPLAND, CA 91786
San Bernardino County (909) 256-4175

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 Alejandra Clark's NPI number?

The NPI number for Alejandra Clark is 1821250358. It was assigned to this individual provider in the NPPES registry on June 26, 2008.

Where is Alejandra Clark located?

Alejandra Clark practices at 820 N Mountain Ave Ste 108, Upland, CA 91786. The listed phone number is (909) 749-1415.

What is Alejandra Clark's specialty?

The primary specialty registered for this NPI is Psychiatry & Neurology, specializing in Psychiatry, with taxonomy code 2084P0800X.

Is Alejandra Clark enrolled in Medicare?

Yes. Alejandra Clark 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 organization bills Medicare for Alejandra Clark's services?

According to the CMS Revalidation Reassignment List (October 2026 release), Alejandra Clark reassigns Medicare benefits to Southern California Permanente Medical Group (Chino Hills, 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 Alejandra Clark'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 Alejandra Clark was last updated on September 2, 2026. NPI Profile syncs weekly with the NPPES registry data releases published by CMS. This NPI record was last updated 47 days 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.