Type 2 · Organization ✓ Active NPI ✓ Valid NPI checksum

Sack Chiropractic PC

Chiropractor in Spearfish, SD · enumerated 2007 · authorized official Michael Sack, President.

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

National Provider Identifier

1538340518

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Registry record

Entity type Organization (Type 2)

Legal business name Sack Chiropractic PC

Practice address 144 N Main St, Spearfish, SD, 57783

Phone (605) 644-1111

Fax (605) 644-1234

Enumeration date Nov 19, 2007

Last updated in NPPES Sep 17, 2014

Taxonomy & classification

111N00000X Chiropractor Chiropractic Providers · License 588 (SD) Primary

Authorized official

Name Michael Sack

Title President

Phone (605) 644-1111

Other identifiers

Identifier	Type	State	Issuer
S7826	Other	SD	MEDICARE PROVIDER 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

Where is Sack Chiropractic PC located?

The practice location on file with NPPES is in Spearfish, SD.

How current is this record?

Data comes from the CMS NPPES public dissemination file; this record was last updated in NPPES on 2014-09-17. Verify at npiregistry.cms.hhs.gov.

Providers at this address

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Michael Sack Chiropractor · Spearfish, SD NPI 1639100076 Acupuncture of the Black Hills, LLC Acupuncturist · Spearfish, SD NPI 1386091338 Dylan Brandenburg Acupuncturist · Spearfish, SD NPI 1104273150

Source: CMS NPPES (public data). Snapshot 2026-07-13. Provider record last updated 2014-09-17.