Quick answers
- Does Mario Ernesto Montealegre Gallegos accept Medicare assignment?
- Yes. Medicare's clinician data says Mario Ernesto Montealegre Gallegos accepts Medicare assignment (the Medicare-approved amount as full payment for covered services), as of October 2, 2026. Ask the office to confirm before your visit.
- How many Medicare patients does Mario Ernesto Montealegre Gallegos see?
- In 2024, CMS data shows 72 Original Medicare patients and 148 services for Mario Ernesto Montealegre Gallegos. This counts Original Medicare only and measures volume, not quality.
- What is Mario Ernesto Montealegre Gallegos's NPI number?
- 1255781225. The NPI (National Provider Identifier) is the clinician's permanent federal ID; you can look it up in the official NPI Registry.
Medicare activity in 2024
Official CMS public-use data for Mario Ernesto Montealegre Gallegos, data year 2024 (released May 21, 2026). It covers Original Medicare (fee-for-service) patients only, not Medicare Advantage or other insurance. It shows volume, not quality or outcomes. CMS hides any count of 10 or fewer patients.
| Original Medicare patients | 72 |
|---|---|
| Services billed to Medicare | 148 |
| Different services or procedures | 32 |
| Participating Medicare provider | Yes |
| Average age of these patients | 73 |
Most frequent services
- Critical care, first 30-74 minutes (99291)48 services
- Subsequent hospital care with straightforward or low level of medical decision making, per day, if using time, at least 25 minutes (99231)32 services
Chronic conditions among these patients
Share of this clinician’s Original Medicare patients with each condition, as published by CMS (it describes the patients, not the care given).
- High blood pressure75%
- High cholesterol75%
- Heart failure68%
- Ischemic heart disease67%
- Arthritis58%
- Atrial fibrillation57%
Hospitals where Mario Ernesto Montealegre Gallegos works
Medicare's Facility Affiliation Data lists Mario Ernesto Montealegre Gallegos at these hospitals (updated October 2, 2026). Each hospital page shows its address, phone, emergency services, Medicare rating and all its clinicians. Star rating and emergency services: Hospital General Information (CMS), data updated October 26, 2026.
- Yale-New Haven HospitalNew Haven, CT · Acute Care Hospital · Medicare rating: 5 of 5 stars · Emergency services: listed by Medicare · CCN 070022
Practice locations
Addresses where Mario Ernesto Montealegre Gallegos is enrolled with Medicare (CMS data updated October 2, 2026).
- 20 York StNew Haven, CT 06510 (203) 785‑4638
Group practices
Medicare enrollment lists Mario Ernesto Montealegre Gallegos as a member of this group (CMS data updated October 2, 2026).
- Yale University2,645 clinicians in the group
Specialties
- Anesthesiologyprimary
- Critical Care (Intensivists)also
Other anesthesiologists in New Haven
Clinicians with the same Medicare primary specialty in New Haven, CT — not a recommendation.
Other clinicians in Yale University
Medicare enrollment lists these clinicians in the same group practice — not a recommendation.
Clinician information
| Credential | MD |
|---|---|
| Graduation year | 2003 (23 years since medical school) |
| Gender (as listed) | Male |
| Medicare assignment | Accepts (Medicare-approved amount as full payment) |
| NPI (National Provider Identifier) | 1255781225 |
| 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 October 2, 2026, retrieved October 29, 2026
- Hospital General Information — CMS, data updated October 26, 2026, retrieved November 13, 2026
- National Downloadable File (Doctors and Clinicians) — CMS, data updated October 2, 2026, retrieved October 29, 2026
- Medicare Physician & Other Practitioners - by Provider — CMS, data year 2024, released May 21, 2026; Medicare Physician & Other Practitioners - by Provider and Service
- 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