Type 1 · Individual ✓ Active NPI ✓ Valid NPI checksum Sole proprietor

Dr. Marcus Chenchi Lien, MD

Critical Care Medicine (Internal Medicine) Physician in Yorktown Heights, NY · enumerated 2006.

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

National Provider Identifier

1063439941

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Registry record

Entity type Individual (Type 1)

Name Dr. Marcus Chenchi Lien

Credential MD

Sex Male

Practice address Yorktown Heights, NY, 10598

Phone (914) 739-0087

Fax (914) 737-1714

Enumeration date Jul 16, 2006

Last updated in NPPES Sep 16, 2020

Street address withheld: NPPES sole-proprietor addresses can be home addresses. See our data policy.

Taxonomy & licenses

207RC0200X Critical Care Medicine (Internal Medicine) Physician Allopathic & Osteopathic Physicians · License 306373 (NY) Primary

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
8483844	Medicaid	WA	-
MD00047409	Other	WA	WA STATE LICENSE
P00466599	Other	WA	RAILROAD MEDICARE
0220888	Other	WA	LABOR & INDUSTRY

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.

Read the full guide → Validate an NPI →

Frequently asked questions

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.

What specialty is Marcus Lien?

Marcus Lien is registered in NPPES with the primary taxonomy of Critical Care Medicine (Internal Medicine) Physician. The taxonomy code describes the provider's classification and area of specialization for claims and credentialing.

Other providers at this practice address

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The Westchester Medical Practice, PC Specialist · Yorktown Heights, NY NPI 1225222953 Lawrence Medical Associates, PC Internal Medicine Physician · Yorktown Heights, NY NPI 1023257441 Philip Jocelyn Physician Assistant · Yorktown Heights, NY NPI 1841622784 Lawrence Medical Associates, PC Multi-Specialty Clinic/Center · Yorktown Heights, NY NPI 1184115479

Source: CMS NPPES (public data). Snapshot 2026-07-13. Provider record last updated 2020-09-16.