Provider records sourced from NPPES (CMS National Plan & Provider Enumeration System). Data current as of October 4, 2026.
NPIDirectory

Dr. Michael P Sack, DC

Individual provider Chiropractor · NPI 1639100076

Dr. Michael P Sack, DC is a Chiropractor in Spearfish, South Dakota. Licensed in South Dakota. Registered with an NPI since 2006.

Licensed in
SD
In the registry since
2006
What do these letters mean?
DC — Doctor of Chiropractic
A licensed chiropractor.

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Practice location Address checks out

144 N Main St
Spearfish, SD 57783-2754 Not confirmed with CMS for 12 years — call before visiting
Phone: (605) 644-1111
Fax: (605) 644-1234
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Pin is approximate — placed at the ZIP-code centre, not the exact door.

Specialties & licences

Chiropractor (primary) Taxonomy 111N00000X · Licence 588 (SD)

Record details

NPI number1639100076
Entity typeIndividual (Type 1)
GenderMale
Credentials DC
Sole proprietorNo
NPI enumeratedJuly 5, 2006
Last updated in NPPESAugust 25, 2014

Medicare patients and services, 2024

From the CMS Medicare Physician & Other Practitioners file for calendar year 2024. It counts Original Medicare patients only, so a practice that mostly sees Medicare Advantage or privately insured patients looks smaller here than it is.

Medicare patients11
Services billed 67 a service is one billed item, such as a visit, a test or a procedure
Average patient age69

Dollar amounts are not shown. What Medicare pays a practice is gross billings, before staff, premises and tax and including the cost of any drugs it administers, so it is not what a clinician earns.

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