Quick answers
- Does Brennan McGill accept Medicare assignment?
- Yes. Medicare's clinician data says Brennan McGill 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 Brennan McGill see?
- In 2024, CMS data shows 161 Original Medicare patients and 193 services for Brennan McGill. This counts Original Medicare only and measures volume, not quality.
- What is Brennan McGill's NPI number?
- 1134507536. 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 Brennan McGill, 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 | 161 |
|---|---|
| Services billed to Medicare | 193 |
| Different services or procedures | 48 |
| Participating Medicare provider | Yes |
| Average age of these patients | 71 |
Most frequent services
- Anesthesia for other procedure on esophagus, stomach, or upper small bowel using an endoscope (00731)24 services
- Anesthesia for electroshock therapy (00104)19 services
- Anesthesia for other procedure on large bowel using an endoscope (00811)19 services
- Anesthesia for procedure for total knee joint replacement (01402)11 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 cholesterol68%
- High blood pressure60%
- Arthritis58%
- Depression32%
- Anxiety32%
- Ischemic heart disease31%
Hospitals where Brennan McGill works
Medicare's Facility Affiliation Data lists Brennan McGill 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.
- Longs Peak HospitalLongmont, CO · Acute Care Hospital · Medicare rating: 5 of 5 stars · Emergency services: listed by Medicare · CCN 060128
- UCHealth Broomfield HospitalBroomfield, CO · Acute Care Hospital · Emergency services: listed by Medicare · CCN 060129
Practice locations
Addresses where Brennan McGill is enrolled with Medicare (CMS data updated October 2, 2026).
- 4747 Arapahoe AveBoulder, CO 80303 (303) 415‑7000
Group practices
Medicare enrollment lists Brennan McGill as a member of this group (CMS data updated October 2, 2026).
- Boulder Valley Anesthesiology, PLLC61 clinicians in the group
Specialties
- Anesthesiologyprimary
Other anesthesiologists in Boulder
Clinicians with the same Medicare primary specialty in Boulder, CO — not a recommendation.
Other clinicians in Boulder Valley Anesthesiology, PLLC
Medicare enrollment lists these clinicians in the same group practice — not a recommendation.
Clinician information
| Credential | MD |
|---|---|
| Graduation year | 2015 (11 years since medical school) |
| Gender (as listed) | Male |
| Medicare assignment | Accepts (Medicare-approved amount as full payment) |
| NPI (National Provider Identifier) | 1134507536 |
| 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