Type 1 · Individual ✓ Active NPI ✓ Valid NPI checksum

Peter K Sien, MD

Radiation Oncology Physician in Kennewick, WA · enumerated 2006.

Data current as of Jul 13, 2026 · sourced from CMS NPPES

National Provider Identifier

1053399568

Verified

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Registry record

Entity type Individual (Type 1)

Name Peter K Sien

Credential MD

Sex Male

Practice address 7379 W Deschutes Ave Ste 100, Kennewick, WA, 99336

Phone (509) 987-1800

Fax (509) 987-1808

Enumeration date Jan 4, 2006

Last updated in NPPES Jan 5, 2026

Taxonomy & licenses

2085R0001X Radiation Oncology Physician Allopathic & Osteopathic Physicians · License MD60698178 (WA) Primary

2085R0001X Radiation Oncology Physician Allopathic & Osteopathic Physicians · License 18502 (AZ) Secondary

2085R0001X Radiation Oncology Physician Allopathic & Osteopathic Physicians · License G32267 (CA) Secondary

MD · Doctor of Medicine: A physician who completed medical school (allopathic medicine), residency training, and state licensure. About the MD credential

Other identifiers

Identifier	Type	State	Issuer
00G322670	Medicaid	CA	-
1053399568	Other	WA	REGENCE BLUE SHIELD
4313432	Other	WA	AETNA
3620029	Other	CA	CIGNA
500732059	Medicaid	OR	-
P01708893	Other	FL	RR MEDICARE
4313432	Other	FL	AETNA
CA211033	Medicaid	CA	-
1053399568	Medicaid	CA	-

What is an NPI number?

A National Provider Identifier (NPI) is a unique 10-digit number that CMS assigns to every U.S. healthcare provider and organization under HIPAA. Type 1 NPIs identify individual providers; Type 2 NPIs identify organizations. The NPI appears on insurance claims, prescriptions, and credentialing paperwork, and never changes, even if the provider moves or changes specialty.

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Frequently asked questions

How do I verify Peter Sien's NPI record?

Cross-check NPI 1053399568 against the official CMS registry at npiregistry.cms.hhs.gov. This page mirrors the same public NPPES data with a monthly snapshot.

Is NPI 1053399568 active?

Yes, as of the latest NPPES snapshot, NPI 1053399568 is active (record last updated 2026-01-05).

Source: CMS NPPES (public data). Snapshot 2026-07-13. Provider record last updated 2026-01-05.