Type 1 · Individual ✓ Active NPI ✓ Valid NPI checksum
William J Knoflicek, PH.D.
Psychologist in Sioux Falls, SD · enumerated 2006.
Data current as of Jul 13, 2026 · sourced from CMS NPPES
National Provider Identifier
1629130075
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Registry record
Entity type Individual (Type 1)
Name William J Knoflicek
Credential PH.D.
Sex Male
Practice address 4400 W 69th St, Ste. 500, Sioux Falls, SD, 57108
Phone (605) 322-7580
Fax (605) 322-7579
Enumeration date Dec 14, 2006
Last updated in NPPES Feb 18, 2015
Taxonomy & licenses
PHD · Doctor of Philosophy: A doctoral degree; in healthcare often held by clinical psychologists and researchers.
About the PHD credential
Other identifiers
| Identifier | Type | State | Issuer |
|---|---|---|---|
| 46022474326 | Medicaid | NE | - |
| 4993504 | Other | SD | WELLMARK BCBS |
| 9236559 | Other | SD | DAKOTACARE PROV # |
| 247052700 | Medicaid | MN | - |
| 6552352 | Medicaid | SD | - |
| 99GO9KN | Other | MN | MN BLUE CROSS PROV # |
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.
Frequently asked questions
Where does William Knoflicek practice?
The practice location on file with NPPES is in Sioux Falls, SD. Providers can have multiple locations; NPPES lists the primary practice address.
What is the NPI number for William Knoflicek?
The National Provider Identifier (NPI) for William Knoflicek is 1629130075, a Type 1 (individual) record in the CMS NPPES registry.
Other providers at this practice address
Browse all → Nancy Wilson Psychiatry Physician · Sioux Falls, SD NPI 1639142185 Tamara Vik Child & Adolescent Psychiatry Physician · Sioux Falls, SD NPI 1548233091 Clifford Mcnaughton Psychiatry Physician · Sioux Falls, SD NPI 1184697633 Scott Schneider Child & Adolescent Psychiatry Physician · Sioux Falls, SD NPI 1639141179 Anthony Vaca Psychiatry Physician · Sioux Falls, SD NPI 1700858248 Laura Withorne-Maloney Family Nurse Practitioner · Sioux Falls, SD NPI 1255303707 Lisa Amiotte Psychiatry Physician · Sioux Falls, SD NPI 1871565333 Timothy Soundy Child & Adolescent Psychiatry Physician · Sioux Falls, SD NPI 1053383539
Source: CMS NPPES (public data). Snapshot 2026-07-13. Provider record last updated 2015-02-18.