Provider records sourced from NPPES (CMS National Plan & Provider Enumeration System). Data current as of August 10, 2026.

William Stephen Knapp, DO

Individual provider Geriatric Medicine (Family Medicine) Physician · NPI 1023099140

William Stephen Knapp, DO is an Internal Medicine in Florissant, Missouri. Graduated from At Still University of Health Sciences, College of Osteo Med, Kirksville in 1978, 48 years ago. Practices with American Multispecialty Group Inc, a 118-clinician group and accepts Medicare assignment. Licensed in Missouri.

Years since qualifying
48
Trained at
At Still University of Health Sciences, College of Osteo Med, Kirksville
Licensed in
MO
In the registry since
2005
What do these letters mean?
DO — Doctor of Osteopathic Medicine
A fully licensed physician, trained like an MD with additional musculoskeletal training. Equivalent practice rights in all 50 states.

See every abbreviation used in this directory →

Practice location Address checks out

2137 Charbonier Rd Ste B
Florissant, MO 63031-5500
Phone: (314) 831-0181
Fax: (314) 851-4471
Show map & directions

Pin is approximate — placed at the ZIP-code centre, not the exact door.

Specialties & licences

Geriatric Medicine (Family Medicine) Physician (primary) Taxonomy 207QG0300X · Licence R8885 (MO)

Record details

NPI number1023099140
Entity typeIndividual (Type 1)
GenderMale
Credentials DO
Sole proprietorNo
NPI enumeratedNovember 7, 2005
Last updated in NPPESFebruary 8, 2019

Medicare enrollment

From the CMS Doctors & Clinicians file — this clinician is enrolled in Medicare.

Medicare specialtyINTERNAL MEDICINE
Medical schoolAT STILL UNIVERSITY OF HEALTH SCIENCES, COLLEGE OF OSTEO MED, KIRKSVILLE
Graduated 1978 (48 years in practice)
Group practice American Multispecialty Group Inc — 118 clinicians
Accepts Medicare assignment Yes — accepts the Medicare-approved amount