Quick answers
- Which hospitals does John Chang work at?
- Medicare's official clinician data lists John Chang at 1 hospital: Yale-New Haven Hospital. This is where the clinician works or has privileges; call the hospital to confirm.
- Where does John Chang see patients?
- Medicare's clinician data lists 1 practice location in New Haven, CT. Call before your visit to confirm the address.
- What is John Chang's specialty?
- Medicare lists Nephrology as the primary specialty, and also Internal Medicine.
- Does John Chang accept Medicare assignment?
- Yes. Medicare's clinician data says John 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 John Chang offer telehealth?
- Medicare's clinician data says John Chang offers telehealth services. Ask the office which visits can be done by video or phone.
- What is the phone number for John Chang?
- (203) 688-2471, as listed in official Medicare / NPI Registry data.
- What is John Chang's NPI number?
- 1447279039. The NPI (National Provider Identifier) is the clinician's permanent federal ID; you can look it up in the official NPI Registry.
Hospitals where John Chang works
Medicare's Facility Affiliation Data lists John Chang 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 John Chang is enrolled with Medicare (CMS data updated 2026-10-02).
- 789 Howard AveNew Haven, CT 06519 (203) 688‑2471
Group practices
Medicare enrollment lists John Chang as a member of this group (CMS data updated 2026-10-02).
- Yale University2,645 clinicians in the group
Specialties
- Nephrologyprimary
- Internal Medicinealso
Other nephrologists in New Haven
Clinicians with the same Medicare primary specialty in New Haven, CT — not a recommendation.
Clinician information
| Credential | MD |
|---|---|
| Medical school | Yale University School Of Medicine |
| Graduation year | 1999 |
| Gender (as listed) | Male |
| Medicare assignment | Accepts (Medicare-approved amount as full payment) |
| Telehealth | Offers telehealth services |
| NPI (National Provider Identifier) | 1447279039 |
| 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