Type 1 · Individual ✓ Active NPI ✓ Valid NPI checksum

Dr. William David Holland, MD

Internal Medicine Physician in Fort Collins, CO · enumerated 2006.

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

National Provider Identifier

1609833649

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Registry record

Entity type Individual (Type 1)

Name Dr. William David Holland

Credential MD

Sex Male

Practice address 1100 Poudre River Dr, Fort Collins, CO, 80524

Phone (970) 224-1550

Enumeration date Apr 26, 2006

Last updated in NPPES Jul 12, 2010

Taxonomy & licenses

207R00000X Internal Medicine Physician Allopathic & Osteopathic Physicians · License 32285 (CO) Primary

207R00000X Internal Medicine Physician Allopathic & Osteopathic Physicians · License MD19497 (TN) Secondary

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

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 NPI 1609833649 active?

Yes, as of the latest NPPES snapshot, NPI 1609833649 is active (record last updated 2010-07-12).

How do I verify William Holland's NPI record?

Cross-check NPI 1609833649 against the official CMS registry at npiregistry.cms.hhs.gov. This page mirrors the same public NPPES data with a monthly snapshot.

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Source: CMS NPPES (public data). Snapshot 2026-07-13. Provider record last updated 2010-07-12.