Quick answers
- Which hospitals does Mark Day work at?
- Medicare's official clinician data lists Mark Day at 1 hospital: Summerlin Hospital Medical Center. This is where the clinician works or has privileges; call the hospital to confirm.
- Where does Mark Day see patients?
- Medicare's clinician data lists 6 practice locations, including Las Vegas, NV and Henderson, NV. Call before your visit to confirm the address.
- What is Mark Day's specialty?
- Medicare lists Family Practice as the primary specialty.
- Does Mark Day accept Medicare assignment?
- Yes. Medicare's clinician data says Mark Day 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 the phone number for Mark Day?
- (702) 579-3253, as listed in official Medicare / NPI Registry data.
- What is Mark Day's NPI number?
- 1164436994. The NPI (National Provider Identifier) is the clinician's permanent federal ID; you can look it up in the official NPI Registry.
Hospitals where Mark Day works
Medicare's Facility Affiliation Data lists Mark Day at these hospitals (updated 2026-10-02). Each hospital page shows its address, phone, emergency services, Medicare rating and all its clinicians.
- Summerlin Hospital Medical CenterLas Vegas, NV · Acute Care Hospital · CCN 290041
Practice locations
Addresses where Mark Day is enrolled with Medicare (CMS data updated 2026-10-02). The first 5 of 6; the Medicare profile lists all.
- 10105 Banburry Cross DrLas Vegas, NV 89144 (702) 579‑3253
- 1655 E Cactus Ave, Suite 400Las Vegas, NV 89183 (702) 724‑8777
- 2845 Siena Heights DrHenderson, NV 89052 (702) 579‑3253
- 420 N Nellis BlvdLas Vegas, NV 89110 (702) 579‑3253
- 540 N Nellis BlvdLas Vegas, NV 89110 (702) 579‑3253
Group practices
Medicare enrollment lists Mark Day as a member of this group (CMS data updated 2026-10-02).
- Optum Medical Group II Rhodes P C296 clinicians in the group
Specialties
- Family Practiceprimary
Other family doctors in Las Vegas
Clinicians with the same Medicare primary specialty in Las Vegas, NV — not a recommendation.
Clinician information
| Credential | DO |
|---|---|
| Medical school | Des Moines University Of Osteopathic Medicine And Health Sciences |
| Graduation year | 1990 |
| Gender (as listed) | Male |
| Medicare assignment | Accepts (Medicare-approved amount as full payment) |
| NPI (National Provider Identifier) | 1164436994 |
| 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