Quick answers
- Which hospitals does William Costello work at?
- Medicare's official clinician data lists William Costello at 1 hospital: Northern Light Maine Coast Hospital. This is where the clinician works or has privileges; call the hospital to confirm.
- Where does William Costello see patients?
- Medicare's clinician data lists 2 practice locations, including Ellsworth, ME and Blue Hill, ME. Call before your visit to confirm the address.
- What is William Costello's specialty?
- Medicare lists Emergency Medicine as the primary specialty.
- Does William Costello accept Medicare assignment?
- Yes. Medicare's clinician data says William Costello accepts Medicare assignment (the Medicare-approved amount as full payment for covered services), as of 2026-10-02. Ask the office to confirm before your visit.
- What is the phone number for William Costello?
- (207) 664-5311, as listed in official Medicare / NPI Registry data.
- What is William Costello's NPI number?
- 1629227145. The NPI (National Provider Identifier) is the clinician's permanent federal ID; you can look it up in the official NPI Registry.
Hospitals where William Costello works
Medicare's Facility Affiliation Data lists William Costello at these hospitals (updated 2026-10-02). Each hospital page shows its address, phone, emergency services, Medicare rating and all its clinicians.
- Northern Light Maine Coast HospitalEllsworth, ME · Acute Care Hospital · CCN 200050
Practice locations
Addresses where William Costello is enrolled with Medicare (CMS data updated 2026-10-02).
- 50 Union StEllsworth, ME 04605 (207) 664‑5311
- 57 Water StBlue Hill, ME 04614 (207) 374‑3400
Group practices
Medicare enrollment lists William Costello as a member of this group (CMS data updated 2026-10-02).
- Emergency Medicine Services of Maine LLC56 clinicians in the group
Specialties
- Emergency Medicineprimary
Other emergency medicine doctors in Maine
Clinicians with the same Medicare primary specialty in Maine — not a recommendation.
Clinician information
| Credential | MD |
|---|---|
| Medical school | Boston University School Of Medicine |
| Graduation year | 1989 |
| Gender (as listed) | Male |
| Medicare assignment | Accepts (Medicare-approved amount as full payment) |
| NPI (National Provider Identifier) | 1629227145 |
| 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
- Facility Affiliation Data — Centers for Medicare & Medicaid Services (CMS), data updated 2026-10-02, retrieved 2026-10-29
- 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