Quick answers
- Where does William B. Sullivan see patients?
- Medicare's clinician data lists 1 practice location in Hattiesburg, MS. Call before your visit to confirm the address.
- What is William B. Sullivan's specialty?
- Medicare lists Allergy/Immunology as the primary specialty, and also Pediatric Medicine.
- Does William B. Sullivan accept Medicare assignment?
- Medicare's clinician data says William B. Sullivan may accept Medicare assignment (as of 2026-10-02). Ask the office whether they accept it for your visit.
- What is the phone number for William B. Sullivan?
- (601) 268-5051, as listed in official Medicare / NPI Registry data.
- What is William B. Sullivan's NPI number?
- 1033177894. The NPI (National Provider Identifier) is the clinician's permanent federal ID; you can look it up in the official NPI Registry.
Practice locations
Addresses where William B. Sullivan is enrolled with Medicare (CMS data updated 2026-10-02).
- 109 Millsaps Dr, Suite CHattiesburg, MS 39402 (601) 268‑5051
Group practices
Medicare enrollment lists William B. Sullivan as a member of this group (CMS data updated 2026-10-02).
- Mississippi Asthma and Allergy Clinic PA14 clinicians in the group
Specialties
- Allergy/Immunologyprimary
- Pediatric Medicinealso
Other allergist and immunologists in Hattiesburg
Clinicians with the same Medicare primary specialty in Hattiesburg, MS — not a recommendation.
Clinician information
| Medical school | University Of Alabama School Of Medicine |
|---|---|
| Graduation year | 1987 |
| Gender (as listed) | Male |
| Medicare assignment | May accept for some services |
| NPI (National Provider Identifier) | 1033177894 |
| Corrections | Report an error or suggest an update → |
Most corrections must be made at the source: clinicians update their NPI Registry record (NPPES) and their Medicare enrollment (PECOS); this page follows the next data release.
Sources
- National Downloadable File (Doctors and Clinicians) — CMS, data updated 2026-10-02, retrieved 2026-10-29
- NPI Registry — U.S. Department of Health and Human Services (NPPES), the clinician’s official record
- Medicare Care Compare — official Medicare tool to look up clinicians