Type 1 · Individual ✓ Active NPI ✓ Valid NPI checksum

Dr. Russell C Tolley, MD

Hematology & Oncology Physician in Louisville, CO · enumerated 2005.

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

National Provider Identifier

1851375414

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Registry record

Entity type Individual (Type 1)

Name Dr. Russell C Tolley

Credential MD

Sex Male

Practice address 80 Health Park Dr, Ste 270, Louisville, CO, 80027

Phone (303) 661-1860

Fax (303) 661-1861

Enumeration date Dec 6, 2005

Last updated in NPPES Dec 29, 2015

Taxonomy & licenses

207RH0003X Hematology & Oncology Physician Allopathic & Osteopathic Physicians · License 28166 (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
01281666	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 is the NPI number for Russell Tolley?

The National Provider Identifier (NPI) for Russell Tolley is 1851375414, a Type 1 (individual) record in the CMS NPPES registry.

Where does Russell Tolley practice?

The practice location on file with NPPES is in Louisville, CO. Providers can have multiple locations; NPPES lists the primary practice address.

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Source: CMS NPPES (public data). Snapshot 2026-07-13. Provider record last updated 2015-12-29.