William Slay
NPI 1902696123 · Physician Assistant · Jackson, MS
Enrolled with Medicare as Practitioner - Physician Assistant · source: CMS PECOS Public Provider Enrollment (2026.04.01)
William Slay is a Physician Assistant provider in Jackson, MS (NPI 1902696123).
Provider details
- NPI number
- 1902696123
- Entity type
- Individual
- Primary specialty
- Physician AssistantPhysician Assistants & Advanced Practice Nursing Providers
- Sex
- Male
- Sole proprietor
- No
- License
- PA00921 (MS)
Specialties & taxonomies
Physician Assistants & Advanced Practice Nursing Providers
Profile Score
A profile completeness & documented-activity index — NOT a quality, outcomes, or patient-satisfaction rating.
- Registry tenure38% of score
1 yr 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
- 2025-05-09
- Last updated
- 2025-08-26
- Certified
- 2025-08-26
Frequently asked questions
- What is William Slay's NPI number?
- William Slay's National Provider Identifier (NPI) is 1902696123, a unique 10-digit ID issued by CMS for use in standard healthcare transactions.
- What is William Slay's specialty?
- William Slay is listed in the NPPES registry with a primary specialty of Physician Assistant (Physician Assistants & Advanced Practice Nursing Providers).
- Where is William Slay located?
- William Slay's practice location on file with NPPES is 501 Marshall St Ste 301, Jackson, MS 39202-1687.
- What is William Slay's phone number?
- The practice phone number listed in the NPPES registry for William Slay is (601) 353-9900.
- Does William Slay accept Medicare?
- William Slay is approved to bill Medicare according to CMS PECOS enrollment data (2026.04.01). Confirm current participation with the provider before scheduling.
- Is William Slay's NPI active?
- Yes — William Slay's NPI (1902696123) is active in the NPPES registry as of the last update on 2025-08-26.
Source: CMS NPPES Data Dissemination (June 2026). NPI Central is not affiliated with CMS. Data is provided as-is from the public registry.