Quick answers
- Which hospitals does Marcellus S. Assiago work at?
- Medicare's official clinician data lists Marcellus S. Assiago at 5 hospitals: Intermountain Health Cedar City Hospital, Intermountain Health Riverton Hospital, Intermountain Medical Center, LDS Hospital and St Mark's Hospital. This is where the clinician works or has privileges; call the hospital to confirm.
- Where does Marcellus S. Assiago see patients?
- Medicare's clinician data lists 4 practice locations, including Riverton, UT, Cedar City, UT and S Salt Lake, UT. Call before your visit to confirm the address.
- What is Marcellus S. Assiago's specialty?
- Medicare lists Nephrology as the primary specialty, and also Internal Medicine.
- Does Marcellus S. Assiago accept Medicare assignment?
- Yes. Medicare's clinician data says Marcellus S. Assiago 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 Marcellus S. Assiago offer telehealth?
- Medicare's clinician data says Marcellus S. Assiago offers telehealth services. Ask the office which visits can be done by video or phone.
- What is the phone number for Marcellus S. Assiago?
- (801) 288-2634, as listed in official Medicare / NPI Registry data.
- What is Marcellus S. Assiago's NPI number?
- 1235348897. The NPI (National Provider Identifier) is the clinician's permanent federal ID; you can look it up in the official NPI Registry.
Hospitals where Marcellus S. Assiago works
Medicare's Facility Affiliation Data lists Marcellus S. Assiago at these hospitals (updated 2026-10-02). Each hospital page shows its address, phone, emergency services, Medicare rating and all its clinicians.
- Intermountain Health Cedar City HospitalCedar City, UT · Acute Care Hospital · CCN 460007
- Intermountain Health Riverton HospitalRiverton, UT · Acute Care Hospital · CCN 460058
- Intermountain Medical CenterMurray, UT · Acute Care Hospital · CCN 460010
- LDS HospitalSalt Lake City, UT · Acute Care Hospital · CCN 460006
- St Mark's HospitalSalt Lake City, UT · Acute Care Hospital · CCN 460047
Practice locations
Addresses where Marcellus S. Assiago is enrolled with Medicare (CMS data updated 2026-10-02).
- 12523 S Creek Meadow Rd, Suite 111Riverton, UT 84065 (801) 288‑2634
- 1320 N Main St, Suite 103Cedar City, UT 84721 (435) 652‑1135
- 3702 S State St, Suite 107S Salt Lake, UT 84115 (801) 288‑2634
- 624 S 1000, Suite 103St George, UT 84790 (435) 652‑1135
Group practices
Medicare enrollment lists Marcellus S. Assiago as a member of these groups (CMS data updated 2026-10-02).
- Nephrology Associates of Utah LLC31 clinicians in the group
- St George Kidney Care LLC8 clinicians in the group
Specialties
- Nephrologyprimary
- Internal Medicinealso
Other nephrologists in Utah
Clinicians with the same Medicare primary specialty in Utah — not a recommendation.
Clinician information
| Credential | MD |
|---|---|
| Graduation year | 1999 |
| Gender (as listed) | Male |
| Medicare assignment | Accepts (Medicare-approved amount as full payment) |
| Telehealth | Offers telehealth services |
| NPI (National Provider Identifier) | 1235348897 |
| 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