Type 1 · Individual ✓ Active NPI ✓ Valid NPI checksum

William D Siff, LIC. AC.

Acupuncturist in Florence, MA · enumerated 2009.

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

National Provider Identifier

1861638322

Verified

See something wrong? Report a correction

Registry record

Entity type Individual (Type 1)

Name William D Siff

Credential LIC. AC.

Sex Male

Practice address 1 N Main St, Florence, MA, 01062

Phone (413) 587-0620

Enumeration date Jan 5, 2009

Last updated in NPPES Jan 5, 2009

Taxonomy & licenses

171100000X Acupuncturist Other Service Providers · License 219534 (MA) Primary

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

How do I verify William Siff's NPI record?

Cross-check NPI 1861638322 against the official CMS registry at npiregistry.cms.hhs.gov. This page mirrors the same public NPPES data with a monthly snapshot.

Is NPI 1861638322 active?

Yes, as of the latest NPPES snapshot, NPI 1861638322 is active (record last updated 2009-01-05).

Source: CMS NPPES (public data). Snapshot 2026-07-13. Provider record last updated 2009-01-05.