Stephen Williamson, M.D.
NPI 1598859183 · Medical Oncology Physician · Westwood, KS
Enrolled with Medicare as Practitioner - Medical Oncology · source: CMS PECOS Public Provider Enrollment (2026.04.01)
Stephen Williamson, M.D. is a Medical Oncology Physician provider in Westwood, KS (NPI 1598859183).
Provider details
- NPI number
- 1598859183
- Entity type
- Individual
- Primary specialty
- Medical Oncology PhysicianAllopathic & Osteopathic Physicians
- Credential
- M.D.
- Sex
- Male
- Sole proprietor
- No
- License
- 04-19904 (KS)
Specialties & taxonomies
Allopathic & Osteopathic Physicians
Profile Score
A profile completeness & documented-activity index — NOT a quality, outcomes, or patient-satisfaction rating.
- Registry tenure38% of score
19 yrs in NPPES registry
- Profile completeness38% of score
100% of core fields populated
- Practice footprint23% of score
1 documented practice location
Signals a provider has no public data for (e.g. Medicare claims) are left out of the score entirely — never counted as zero — so providers without that data are not penalized. See the full formula and weights in our methodology.
Practice location
Mailing address
Registry dates
- Enumerated
- 2006-10-03
- Last updated
- 2014-05-12
Frequently asked questions
- What is Stephen Williamson's NPI number?
- Stephen Williamson's National Provider Identifier (NPI) is 1598859183, a unique 10-digit ID issued by CMS for use in standard healthcare transactions.
- What is Stephen Williamson's specialty?
- Stephen Williamson is listed in the NPPES registry with a primary specialty of Medical Oncology Physician (Allopathic & Osteopathic Physicians).
- Where is Stephen Williamson located?
- Stephen Williamson's practice location on file with NPPES is 2330 Shawnee Mission Pkwy, Westwood, KS 66205-2005.
- What is Stephen Williamson's phone number?
- The practice phone number listed in the NPPES registry for Stephen Williamson is (913) 588-7750.
- Does Stephen Williamson accept Medicare?
- Stephen Williamson is approved to bill Medicare according to CMS PECOS enrollment data (2026.04.01). Confirm current participation with the provider before scheduling.
- Is Stephen Williamson's NPI active?
- Yes — Stephen Williamson's NPI (1598859183) is active in the NPPES registry as of the last update on 2014-05-12.
Source: CMS NPPES Data Dissemination (June 2026). NPI Central is not affiliated with CMS. Data is provided as-is from the public registry.