Quick answers
- Which hospitals does Alejandro Contreras work at?
- Medicare's official clinician data lists Alejandro Contreras at 4 hospitals: Baystate Franklin Medical Center, Baystate Medical Center, Baystate Noble Hospital and Baystate Wing Hospital. This is where the clinician works or has privileges; call the hospital to confirm.
- Where does Alejandro Contreras see patients?
- Medicare's clinician data lists 4 practice locations, including Greenfield, MA, Springfield, MA and Palmer, MA. Call before your visit to confirm the address.
- What is Alejandro Contreras's specialty?
- Medicare lists Anesthesiology as the primary specialty.
- Does Alejandro Contreras accept Medicare assignment?
- Yes. Medicare's clinician data says Alejandro Contreras 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 Alejandro Contreras's NPI number?
- 1255725792. The NPI (National Provider Identifier) is the clinician's permanent federal ID; you can look it up in the official NPI Registry.
Hospitals where Alejandro Contreras works
Medicare's Facility Affiliation Data lists Alejandro Contreras at these hospitals (updated 2026-10-02). Each hospital page shows its address, phone, emergency services, Medicare rating and all its clinicians.
- Baystate Franklin Medical CenterGreenfield, MA · Acute Care Hospital · CCN 220016
- Baystate Medical CenterSpringfield, MA · Acute Care Hospital · CCN 220077
- Baystate Noble HospitalWestfield, MA · Acute Care Hospital · CCN 220065
- Baystate Wing HospitalPalmer, MA · Acute Care Hospital · CCN 220030
Practice locations
Addresses where Alejandro Contreras is enrolled with Medicare (CMS data updated 2026-10-02).
- 164 High StGreenfield, MA 01301
- 280 Chestnut St, Suite 2Springfield, MA 01199
- 40 Wright StPalmer, MA 01069
- 759 Chestnut StSpringfield, MA 01199
Group practices
Medicare enrollment lists Alejandro Contreras as a member of this group (CMS data updated 2026-10-02).
- Baystate Medical Practices Inc1,369 clinicians in the group
Specialties
- Anesthesiologyprimary
Other anesthesiologists in Greenfield
Clinicians with the same Medicare primary specialty in Greenfield, MA — not a recommendation.
Clinician information
| Credential | MD |
|---|---|
| Graduation year | 2015 |
| Gender (as listed) | Male |
| Medicare assignment | Accepts (Medicare-approved amount as full payment) |
| NPI (National Provider Identifier) | 1255725792 |
| 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