Dr. Michael P Sack, D.C.
Dr. Michael P Sack is a Chiropractor provider (Chiropractor) practicing in Spearfish, SD, registered in the NPPES registry with NPI 1639100076 since 2006. The credential DC stands for Doctor of Chiropractic.
✓ Active NPI ✓ Valid NPI checksum
| NPI | 1639100076 |
|---|---|
| Entity type | Individual (Type 1) |
| Name | Dr. Michael P Sack |
| Credential | D.C. |
| Sex | Male |
| Practice address | 144 N MAIN ST, Spearfish, SD, 57783 |
| Phone | 6056441111 |
| Fax | 6056441234 |
| Enumeration date | 2006-07-05 |
| Last updated in NPPES | 2014-08-25 |
Taxonomy & licenses
| Taxonomy code | Specialty | Primary | License | State |
|---|---|---|---|---|
| 111N00000X | Chiropractor | Primary | 588 | SD |
DC — Doctor of Chiropractic: A licensed chiropractor focusing on musculoskeletal and nervous system disorders. About the DC credential
Copy-ready billing details
Provider: Michael Sack, D.C. NPI: 1639100076 Taxonomy: 111N00000X (Chiropractor) Address: 144 N MAIN ST, Spearfish, SD, 57783
Other providers at this practice address
| NPI | Name | Type | Specialty | Location |
|---|---|---|---|---|
| 1538340518 | Sack Chiropractic PC | Organization | Chiropractor | Spearfish, SD |
| 1386091338 | Acupuncture of the Black Hills, LLC | Organization | Acupuncturist | Spearfish, SD |
| 1104273150 | Dylan Brandenburg | Individual | Acupuncturist | Spearfish, SD |
Verify this record
Cross-check NPI 1639100076 against the authoritative CMS record: view Dr. Michael P Sack on the official NPPES registry .
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 or validate an NPI number.
Frequently asked questions
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Source: CMS NPPES (public data). Snapshot 2026-07-11. Provider record last updated 2014-08-25.