Type 1 · Individual ✓ Active NPI ✓ Valid NPI checksum

Mr. William R. Underwood Jr., L. AC.

Acupuncturist in Longmont, CO · enumerated 2014.

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

National Provider Identifier

1861892986

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Registry record

Entity type Individual (Type 1)

Name Mr. William R. Underwood Jr.

Credential L. AC.

Sex Male

Practice address 1551 Professional Ln, Suite 180, Longmont, CO, 80501

Phone (303) 772-0598

Enumeration date Aug 26, 2014

Last updated in NPPES Oct 29, 2021

Taxonomy & licenses

171100000X Acupuncturist Other Service Providers · License 0002020 (CO) Primary

LAC · Licensed Acupuncturist: A practitioner licensed to perform acupuncture. About the LAC 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.

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Frequently asked questions

What specialty is William Underwood?

William Underwood is registered in NPPES with the primary taxonomy of Acupuncturist. 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 2021-10-29.