Type 1 · Individual ✓ Active NPI ✓ Valid NPI checksum

Mr. Clifford David Lien, LDO

Optician in Portland, OR · enumerated 2006.

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

National Provider Identifier

1720174782

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Registry record

Entity type Individual (Type 1)

Name Mr. Clifford David Lien

Credential LDO

Sex Male

Practice address 3600 N Interstate Ave, Portland, OR, 97227

Phone (503) 249-3429

Fax (503) 249-5548

Enumeration date Oct 5, 2006

Last updated in NPPES Jul 8, 2007

Taxonomy & licenses

156FX1800X Optician Eye and Vision Services Providers · License 1967 (WA) Primary

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

What specialty is Clifford Lien?

Clifford Lien is registered in NPPES with the primary taxonomy of Optician. The taxonomy code describes the provider's classification and area of specialization for claims and credentialing.

Is this the official NPI registry?

No. NPI Portal is a private site built on public CMS NPPES data. The official registry is npiregistry.cms.hhs.gov, operated by CMS.

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Source: CMS NPPES (public data). Snapshot 2026-07-13. Provider record last updated 2007-07-08.