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Recently Updated NPI Information — some details in this NPI profile have been updated in the NPI registry within the last 30 days.

LILLIAM A SIERRA M.D.
NPI 1275533838
Pediatrics - Developmental - Behavioral Pediatrics in Kennewick, WA

Active since July 26, 2005
7301 W DESCHUTES AVE, SUITE A, KENNEWICK, WA 99336(509) 374-1962(509) 374-0572 Get Directions Write a Review

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

About Lilliam A Sierra M.d. NPPES

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

LILLIAM A SIERRA M.D. (NPI 1275533838) is an individual developmental - behavioral pediatrics provider in Kennewick, Washington, licensed in Washington (MD00024390) and active in the NPI registry since July 2005.

NPPES Registry Identity

NPI1275533838
Entity TypeIndividualFemale
Primary Taxonomy2080P0006X
Provider Legal NameLILLIAM A SIERRACredential: M.D.
Location Address7301 W DESCHUTES AVE, SUITE AKennewick, WA 99336-7757
Mailing Address7301 W Deschutes Ave, Suite AKennewick, WA 99336-7757 · (509) 374-1962 · Fax (509) 374-0572
Phone(509) 374-1962
Fax(509) 374-0572
Sole ProprietorNo
Enumeration DateJuly 26, 2005
Last NPPES UpdateJuly 13, 2026
✔ NPI 1275533838 is a valid, active identifier and passes the ISO check-digit test.

Specialties & Licenses

★ Primary SpecialtyPediatrics · Developmental - Behavioral PediatricsAllopathic & Osteopathic Physicians
Taxonomy Code2080P0006X
License✔ Licensed in WA · MD00024390
Definition
A developmental-behavioral specialist is a pediatrician with special training and experience who aims to foster understanding and promotion of optimal development of children and families through research, education, clinical care and advocacy efforts. This physician assists in the prevention, diagnosis, and management of developmental difficulties and problematic behaviors in children and in the family dysfunctions that compromise children's development.
7301 W DESCHUTES AVE, Kennewick, WA 99336
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Other Identifiers 1

Medicaid1089663WA

Other Providers at the Same Location NPPES 3

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

DR. CLAUDE KENNETH DEPEW O.D.
Optometrist
7301 W DESCHUTES AVE, SUITE B
KENNEWICK, WA 99336
Benton County (509) 735-2020
DR. KENNETH JEROME HOWARD DDS
Dentist
7301 W DESCHUTES AVE, STE C
KENNEWICK, WA 99336
Benton County (509) 783-9669
DR. JARED B CHRISTENSEN O.D.
Optometrist
7301 W DESCHUTES AVE, SUITE B
KENNEWICK, WA 99336
Benton County (509) 735-2020

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 Lilliam Sierra's NPI number?

The NPI number for Lilliam Sierra is 1275533838. It was assigned to this individual provider in the NPPES registry on July 26, 2005.

Where is Lilliam Sierra located?

Lilliam Sierra practices at 7301 W Deschutes Ave Suite A, Kennewick, WA 99336. The listed phone number is (509) 374-1962.

What is Lilliam Sierra's specialty?

The primary specialty registered for this NPI is Pediatrics, specializing in Developmental - Behavioral Pediatrics, with taxonomy code 2080P0006X.

When was this NPI record last updated?

The NPPES record for Lilliam Sierra 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 22 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.