Quick answers
- Which hospitals does Alan Chang work at?
- Medicare's official clinician data lists Alan Chang at 1 hospital: Suny/Stony Brook University Hospital. This is where the clinician works or has privileges; call the hospital to confirm.
- Where does Alan Chang see patients?
- Medicare's clinician data lists 4 practice locations, including Stony Brook, NY and East Setauket, NY. Call before your visit to confirm the address.
- What is Alan Chang's specialty?
- Medicare lists Endocrinology as the primary specialty.
- Does Alan Chang accept Medicare assignment?
- Yes. Medicare's clinician data says Alan Chang 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.
- Does Alan Chang offer telehealth?
- Medicare's clinician data says Alan Chang offers telehealth services. Ask the office which visits can be done by video or phone.
- What is the phone number for Alan Chang?
- (631) 444-0580, as listed in official Medicare / NPI Registry data.
- What is Alan Chang's NPI number?
- 1649408675. The NPI (National Provider Identifier) is the clinician's permanent federal ID; you can look it up in the official NPI Registry.
Hospitals where Alan Chang works
Medicare's Facility Affiliation Data lists Alan Chang at these hospitals (updated 2026-10-02). Each hospital page shows its address, phone, emergency services, Medicare rating and all its clinicians.
- Suny/Stony Brook University HospitalStony Brook, NY · Acute Care Hospital · CCN 330393
Practice locations
Addresses where Alan Chang is enrolled with Medicare (CMS data updated 2026-10-02).
- 100 Nicolls RdStony Brook, NY 11794 (631) 444‑0580
- 101 Nicolls RdStony Brook, NY 11794 (631) 444‑5220
- 26 Research WayEast Setauket, NY 11733 (631) 444‑0580
- PO Box, Suite 1554Stony Brook, NY 11790
Group practices
Medicare enrollment lists Alan Chang as a member of this group (CMS data updated 2026-10-02).
- Stony Brook Internists University Faculty Practice Corporation428 clinicians in the group
Specialties
- Endocrinologyprimary
Other endocrinologists in Stony Brook
Clinicians with the same Medicare primary specialty in Stony Brook, NY — not a recommendation.
Clinician information
| Credential | MD |
|---|---|
| Graduation year | 2009 |
| Gender (as listed) | Male |
| Medicare assignment | Accepts (Medicare-approved amount as full payment) |
| Telehealth | Offers telehealth services |
| NPI (National Provider Identifier) | 1649408675 |
| 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