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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.

DR. DAVID ALLAN SLIER PH.D.
NPI 1528034725
Psychologist - Clinical in La Mesa, CA

Active since February 27, 2006PECOS Enrolled
4700 SPRING ST, STE 306, LA MESA, CA 91942(619) 532-6460(619) 532-6299 Get Directions Write a Review

NPPES record last updated: July 13, 2026. Verified against the NPPES registry weekly; last sync: August 02, 2026.

About Dr. David Allan Slier Ph.d. NPPES

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

DR. DAVID ALLAN SLIER PH.D. (NPI 1528034725) is an individual clinical provider in La Mesa, California, licensed in California (PSY 9927) and active in the NPI registry since February 2006. He is enrolled in Medicare PECOS and is a graduate of Other (1985).

NPPES Registry Identity

NPI1528034725
Entity TypeIndividualMale
Primary Taxonomy103TC0700X
Provider Legal NameDR. DAVID ALLAN SLIERCredential: PH.D.
Location Address4700 SPRING ST, STE 306La Mesa, CA 91942-2294
Mailing Address34800 Bob Wilson Dr, Nmcsd, Attn: Medical Staff ServicesSan Diego, CA 92134-1098 · (619) 532-6460 · Fax (619) 532-6299
Phone(619) 532-6460
Fax(619) 532-6299
Sole ProprietorNo
Medical School CMSOtherGraduated 1985
Enumeration DateFebruary 27, 2006
Last NPPES UpdateJuly 13, 2026
✔ NPI 1528034725 is a valid, active identifier and passes the ISO check-digit test.

Specialties & Licenses

★ Primary SpecialtyPsychologist · ClinicalBehavioral Health & Social Service Providers
Taxonomy Code103TC0700X
License✔ Licensed in CA · PSY 9927
Definition
A psychologist who provides continuing and comprehensive mental and behavioral health care for individuals and families; consultation to agencies and communities; training, education and supervision; and research-based practice. It is a specialty in breadth -- one that is broadly inclusive of severe psychopathology -- and marked by comprehensiveness and integration of knowledge and skill from a broad array of disciplines within and outside of psychology proper. The scope of clinical psychology encompasses all ages, multiple diversities and varied systems.
4700 SPRING ST, La Mesa, CA 91942
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Accepted Insurance

The full list of accepted plans is on the Insurance tab. Issuers include Providence Health Plan.Insurance ›

Medicare Participation & PECOS CMS

Medicare enrollment, assignment, and ordering and referring status from the CMS PECOS system.

Medicare Enrollment Status

✔

Enrolled in Medicare (PECOS)

Dr. David Allan Slier Ph.d. is registered in the CMS Provider Enrollment, Chain and Ownership System (PECOS).

PECOS PAC ID1456332659
PECOS Enrollment IDI20040525000746
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.

Physician Visit Costs CMS claims · ZIP area

Typical Medicare office-visit costs in the 91942 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
$184.71 typical visit price
range $62.10 – $184.71
Typical copayment $46.17 (range $15.52 – $46.17)
Most-billed visit code 99205
Established Patient
$108.42 typical visit price
range $20.62 – $151.42
Typical copayment $27.10 (range $5.15 – $37.85)
Most-billed visit code 99214
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 20

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

ROBERT M KATNIK
Psychologist (Clinical)
4700 SPRING ST, #220
LA MESA, CA 91942
San Diego County (760) 730-4540
MS. HELENA B WADE LCSW
Social Worker (Clinical)
4700 SPRING ST
LA MESA, CA 91942
San Diego County (619) 591-5740
JACK CONNOLLY
Behavior Technician
4700 SPRING ST
LA MESA, CA 91942
San Diego County (619) 782-0700
PAMELA VELARDI NP
Nurse Practitioner (Psychiatric/Mental Health)
4700 SPRING ST, STE. 220
LA MESA, CA 91942
San Diego County (619) 667-3380
COUNSELING & BEHAVIORAL SPECIALISTS
Community/Behavioral Health
4700 SPRING ST, STE 203
LA MESA, CA 91942
San Diego County (619) 697-0470
ITZEL MARCHENA
Behavior Technician
4700 SPRING ST
LA MESA, CA 91942
San Diego County (619) 782-0700
ANDARYAH GHANIM
Behavior Technician
4700 SPRING ST
LA MESA, CA 91942
San Diego County (619) 782-0700
LABRIE S FRENCH-ASARO MFT
Marriage & Family Therapist
4700 SPRING ST, SUITE 220
LA MESA, CA 91942
San Diego County (619) 667-3380

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 David Slier's NPI number?

The NPI number for David Slier is 1528034725. It was assigned to this individual provider in the NPPES registry on February 27, 2006.

Where is David Slier located?

David Slier practices at 4700 Spring St Ste 306, La Mesa, CA 91942. The listed phone number is (619) 532-6460.

What is David Slier's specialty?

The primary specialty registered for this NPI is Psychologist, specializing in Clinical, with taxonomy code 103TC0700X.

Is David Slier enrolled in Medicare?

Yes. David Slier is registered in the Medicare PECOS enrollment system.

What insurance does David Slier accept?

Health plans from Providence Health Plan list David Slier as in-network in at least one marketplace plan. Coverage varies by plan and year; verify with the insurer or the provider before a visit.

When was this NPI record last updated?

The NPPES record for David Slier was last updated on July 13, 2026. NPI Profile syncs weekly with the NPPES registry data releases published by CMS. This NPI record was last updated 25 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.