William O'Nan, M.D.
NPI 1619944428 · Obstetrics & Gynecology Physician · Henderson, KY
Enrolled with Medicare as Practitioner - Obstetrics/Gynecology · source: CMS PECOS Public Provider Enrollment (2026.04.01)
William O'Nan, M.D. is a Obstetrics & Gynecology Physician provider in Henderson, KY (NPI 1619944428).
Provider details
- NPI number
- 1619944428
- Entity type
- Individual
- Primary specialty
- Obstetrics & Gynecology PhysicianAllopathic & Osteopathic Physicians
- Credential
- M.D.
- Sex
- Male
- Sole proprietor
- Yes
- License
- 17430 (KY)
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
20 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
- 2006-03-01
- Last updated
- 2012-11-01
Frequently asked questions
- What is William O'Nan's NPI number?
- William O'Nan's National Provider Identifier (NPI) is 1619944428, a unique 10-digit ID issued by CMS for use in standard healthcare transactions.
- What is William O'Nan's specialty?
- William O'Nan is listed in the NPPES registry with a primary specialty of Obstetrics & Gynecology Physician (Allopathic & Osteopathic Physicians).
- Where is William O'Nan located?
- William O'Nan's practice location on file with NPPES is 319 8th St, Henderson, KY 42420-2963.
- What is William O'Nan's phone number?
- The practice phone number listed in the NPPES registry for William O'Nan is (270) 869-9888.
- Does William O'Nan accept Medicare?
- William O'Nan is approved to bill Medicare according to CMS PECOS enrollment data (2026.04.01). Confirm current participation with the provider before scheduling.
- Is William O'Nan's NPI active?
- Yes — William O'Nan's NPI (1619944428) is active in the NPPES registry as of the last update on 2012-11-01.
Source: CMS NPPES Data Dissemination (June 2026). NPI Central is not affiliated with CMS. Data is provided as-is from the public registry.