Quick answers
- Which hospitals does Frank J. Mongillo Iii work at?
- Medicare's official clinician data lists Frank J. Mongillo Iii at 1 hospital: Yale-New Haven Hospital. This is where the clinician works or has privileges; call the hospital to confirm.
- Where does Frank J. Mongillo Iii see patients?
- Medicare's clinician data lists 1 practice location in New Haven, CT. Call before your visit to confirm the address.
- What is Frank J. Mongillo Iii's specialty?
- Medicare lists Internal Medicine as the primary specialty.
- Does Frank J. Mongillo Iii accept Medicare assignment?
- Yes. Medicare's clinician data says Frank J. Mongillo Iii 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 Frank J. Mongillo Iii?
- (203) 776-6845, as listed in official Medicare / NPI Registry data.
- What is Frank J. Mongillo Iii's NPI number?
- 1811917289. The NPI (National Provider Identifier) is the clinician's permanent federal ID; you can look it up in the official NPI Registry.
Hospitals where Frank J. Mongillo Iii works
Medicare's Facility Affiliation Data lists Frank J. Mongillo Iii at these hospitals (updated 2026-10-02). Each hospital page shows its address, phone, emergency services, Medicare rating and all its clinicians.
- Yale-New Haven HospitalNew Haven, CT · Acute Care Hospital · CCN 070022
Practice locations
Addresses where Frank J. Mongillo Iii is enrolled with Medicare (CMS data updated 2026-10-02).
- 26 Elm StNew Haven, CT 06510 (203) 776‑6845
Specialties
- Internal Medicineprimary
Other internal medicine doctors in New Haven
Clinicians with the same Medicare primary specialty in New Haven, CT — not a recommendation.
Clinician information
| Credential | MD |
|---|---|
| Medical school | George Washington University School Of Medicine |
| Graduation year | 1994 |
| Gender (as listed) | Male |
| Medicare assignment | Accepts (Medicare-approved amount as full payment) |
| NPI (National Provider Identifier) | 1811917289 |
| 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