Type 1 · Individual ✓ Active NPI ✓ Valid NPI checksum

Dr. Siemay Chang Lee, MD

Internal Medicine Physician in Greeley, CO · enumerated 2007.

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

National Provider Identifier

1497966824

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Registry record

Entity type Individual (Type 1)

Name Dr. Siemay Chang Lee

Credential MD

Sex Female

Practice address 6767 West 29th Street, 2nd Floor, Greeley, CO, 80634

Phone (970) 652-2433

Fax (970) 652-2252

Enumeration date May 25, 2007

Last updated in NPPES Aug 20, 2020

Taxonomy & licenses

207R00000X Internal Medicine Physician Allopathic & Osteopathic Physicians · License 11789 (NV) Secondary

207R00000X Internal Medicine Physician Allopathic & Osteopathic Physicians · License DR.0052999 (CO) 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
19052863	Medicaid	CO	-

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

What specialty is Siemay Lee?

Siemay Lee is registered in NPPES with the primary taxonomy of Internal Medicine Physician. 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 2020-08-20.