Type 1 · Individual ✓ Active NPI ✓ Valid NPI checksum

Mr. Hillard R Zallen, MD

Family Medicine Physician in Longmont, CO · enumerated 2007.

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

National Provider Identifier

1225157712

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Registry record

Entity type Individual (Type 1)

Name Mr. Hillard R Zallen

Credential MD

Sex Male

Practice address 2345 Bent Way, Longmont, CO, 80503

Phone (303) 338-4545

Enumeration date Mar 28, 2007

Last updated in NPPES May 7, 2021

Taxonomy & licenses

207Q00000X Family Medicine Physician Allopathic & Osteopathic Physicians · License 43118 (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
09655212	Medicaid	CO	-
21971	Other	CO	KAISER COMMERCIAL NUMBER

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

How do I verify Hillard Zallen's NPI record?

Cross-check NPI 1225157712 against the official CMS registry at npiregistry.cms.hhs.gov. This page mirrors the same public NPPES data with a monthly snapshot.

Is NPI 1225157712 active?

Yes, as of the latest NPPES snapshot, NPI 1225157712 is active (record last updated 2021-05-07).

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Source: CMS NPPES (public data). Snapshot 2026-07-13. Provider record last updated 2021-05-07.