Dr. Mandy J Williams , PhD, CCC-SLP
Speech-Language Pathologist β’ Vermillion, SD
414 E Clark St
Vermillion, SD 57069
This profile restates public CMS/NPPES data; T-MedInfo gives no medical advice — consult a licensed professional, and call 911 for emergencies.
Practice Location & Contact Primary Location
414 E Clark St
Vermillion, SD 57069
Matched by practice address or phone in NPPES. A shared address or phone does not confirm that this clinician works there.
What Public CMS Data Show
Speech-Language Pathologist: NPPES taxonomy is a reported classification, not proof of board certification.
NPI first issued
2006
The year this clinician's National Provider Identifier (NPI) was issued. An NPI is a unique 10-digit ID that US health care providers use for billing.
What this does not show: NPI first issued
NPIs have been issued only since 2005, so this year is not necessarily when the clinician started practicing.
Source: CMS NPPES NPI Registry.
Medicare assignment not listed
CMS data do not show whether this clinician accepts Medicare assignment. This does not mean they do not accept Medicare. Ask the office.
Medicare assignment applies to Original Medicare. It does not tell you whether the clinician is in a Medicare Advantage plan's network, accepts other insurance, or is taking new patients.
Source: CMS Doctors and Clinicians, CMS release of October 2, 2026; Medicare.gov, βDoes your provider accept Medicare as full payment?β
No telehealth indicator
CMS shows this indicator only when recent Medicare claims include telehealth services. The clinician may still offer telehealth; ask the office.
Source: CMS, Telehealth Indicator on Medicare Care Compare (fact sheet, January 2023); CMS Doctors and Clinicians, CMS release of October 2, 2026.
Compared with the same specialty in Vermillion and South Dakota
14 active clinicians are listed under Speech-Language Pathologist with a practice address in Vermillion, SD (624 in South Dakota).
Addresses are self-reported to NPPES and may be out of date.
Telehealth indicator in Vermillion
0% of these 14 clinicians have the CMS telehealth indicator.
7.1% of these 14 clinicians are listed by CMS as accepting Medicare assignment.
Sources: CMS Doctors and Clinicians, CMS release of October 2, 2026, CMS NPPES NPI Registry. Specialty names follow the NUCC Health Care Provider Taxonomy.
Text: T-MedInfo Β· Report an error.
Specialties & License Numbers Reported to NPPES
NUCC Taxonomy Code: 235Z00000X
The speech-language pathologist is the professional who engages in clinical services, prevention, advocacy, education, administration, and research in the areas of communication and swallowing across the life span from infancy through geriatrics. Speech-language pathologists address typical and atypical impairments and disorders related to communication and swallowing in the areas of speech sound production, resonance, voice, fluency, language (comprehension and expression), cognition, and feeding and swallowing.
Secondary Practice Locations
414 E Clark St
Vermillion, SD 570692307
Phone: 6056776205
Clinicians Sharing This Practice Address or Phone
Clinicians sharing this NPPES address, phone or fax; a shared contact does not mean they work together.
Audiologist
Doctor of Philosophy (Ph.D.), CCCA
Audiologist
Doctor of Audiology
Dentist - General Practice
Doctor of Dental Surgery
Career & Practice History Timeline
Changes recorded in monthly NPPES data files: addresses, names, credentials, specialties and NPI status
Registered at 414 E CLARK ST, VERMILLION, SD 57069 (Tel: 6056776205)
Registered at 414 E CLARK ST, VERMILLION, SD 570692307 (Tel: 6056776205)
Additional practice office at 414 E Clark St, Vermillion, SD 570692307
Speech-Language Pathologist (license number reported to NPPES: SD 274-SLP)
NPI status registered as active in NPPES database
Registered at 2000 UNIVERSITY CMNS, MOBILE, AL 366880002 (Tel: 2513802600)
Registered at 2000 UNIVERSITY CMNS, MOBILE, AL 366880002 (Tel: 2513802600)
Recorded as MANDY WILLIAMS, PH.D., CCC-SLP
Speech-Language Pathologist (license number reported to NPPES: AL 2334)
First registered as active Individual Practitioner in NPPES Database.
NPI Administrative Meta
Mailing Address
414 E Clark St
Vermillion, SD 570692307
Phone: 6056776205