Marcellus Assiago, MD
NPI 1235348897 · Nephrology Physician · Riverton, UT
Enrolled with Medicare as Practitioner - Nephrology · source: CMS PECOS Public Provider Enrollment (2026.04.01)
Marcellus Assiago, MD is a Nephrology Physician provider in Riverton, UT (NPI 1235348897).
Provider details
- NPI number
- 1235348897
- Entity type
- Individual
- Primary specialty
- Nephrology PhysicianAllopathic & Osteopathic Physicians
- Credential
- MD
- Sex
- Male
- Sole proprietor
- No
- License
- 13068 (NV)
Specialties & taxonomies
Allopathic & Osteopathic Physicians
Allopathic & Osteopathic Physicians
Profile Score
A profile completeness & documented-activity index — NOT a quality, outcomes, or patient-satisfaction rating.
- Registry tenure25% of score
19 yrs in NPPES registry
- Profile completeness25% of score
100% of core fields populated
- Practice footprint15% of score
7 documented practice locations
- Medicare service volume (vs. specialty peers)25% of score
910 Medicare services, 2024 (ranked within specialty)
- Open Payments transparency10% of score
Has Open Payments disclosures (2024)
Medicare volume is ranked against active providers in the same specialty. Signals a provider has no public data for (e.g. Medicare claims) are left out of the score entirely — never counted as zero — so providers without that data are not penalized. See the full formula and weights in our .
What this provider does (Medicare)
Based on Medicare fee-for-service claims, 2024; not all care is captured.
| Service (HCPCS) | Medicare services | Typical Medicare-allowed (2024) |
|---|---|---|
| Established Patient Office Or Other Outpatient Visit With Moderate Level of Decision Making, If Using Time, 30 Minutes Or More99214 | 207 | $99 |
| Visit Complexity Inherent to Evaluation and Management Associated With Medical Care Services That Serve As the Continuing Focal Point for All Needed Health Care Services And/Or With Medical Care Services That Are Part of Ongoing Care Related to a Patient'SG2211 | 204 | $16 |
| Dialysis Services, 4 Or More Physician Visits Per Month (20 Years Or Older)90960 | 168 | $334 |
| Established Patient Office Or Other Outpatient Visit With Low Level OD Decision Making, If Using Time, 20 Minutes Or More99213 | 77 | $77 |
| Established Patient Office Or Other Outpatient Visit With High Level of Medical Decision Making, If Using Time, 40 Minutes Or More99215 | 62 | $143 |
What this provider prescribes (Medicare Part D)
Top drugs by Medicare Part D claim volume, 2024 · 29 distinct drugs on file.
| Drug | Part D claims (2024) | Beneficiaries |
|---|---|---|
| Amlodipine Besylate | 93 | 37 |
| Calcitriol | 75 | 28 |
| Potassium Chloride | 68 | 25 |
| Empagliflozinbrand: Jardiance | 59 | 13 |
| Carvedilol | 58 | 18 |
| Torsemide | 49 | 21 |
| Dapagliflozin Propanediolbrand: Farxiga | 49 | — |
Transparency — industry payments
Based on CMS Open Payments, 2024; not all care is captured.
$170 across 9 records (Open Payments 2024)
Open Payments discloses payments and transfers of value (meals, travel, consulting, research, royalties) from drug and device makers to providers. This is a transparency signal, not a verdict — such payments are legal and common, and their presence is neither an endorsement nor a criticism. Source: CMS Open Payments, program year 2024.
Practice location
Mailing address
Additional practice locations (6)
- 1320 N Main St Ste 103Cedar City, UT 84721-1230Phone: (435) 652-1135Fax: (435) 652-1190
- 3702 S State St Ste 107South Salt Lake, UT 84115-5096Phone: (801) 288-2634Fax: (801) 288-1186
- 624 S 1000 E Ste 103St George, UT 84790-5902Phone: (435) 652-1135Fax: (435) 652-1190
- 1244 N Main St Ste 101Tooele, UT 84074-9839Phone: (801) 288-2634Fax: (801) 288-1186
- 3823 W 9000 SWest Jordan, UT 84088-5603Phone: (801) 288-2634Fax: (801) 288-1186
- 3823 W 9000 SWest Jordan, UT 84088-5603Phone: (801) 288-2634Fax: (801) 288-1186
Registry dates
- Enumerated
- 2007-05-21
- Last updated
- 2024-05-02
- Certified
- 2024-05-02
Frequently asked questions
- What is Marcellus Assiago's NPI number?
- Marcellus Assiago's National Provider Identifier (NPI) is 1235348897, a unique 10-digit ID issued by CMS for use in standard healthcare transactions.
- What is Marcellus Assiago's specialty?
- Marcellus Assiago is listed in the NPPES registry with a primary specialty of Nephrology Physician (Allopathic & Osteopathic Physicians).
- Where is Marcellus Assiago located?
- Marcellus Assiago's practice location on file with NPPES is 12523 S Creek Meadow Rd Ste 111, Riverton, UT 84065-7291.
- What is Marcellus Assiago's phone number?
- The practice phone number listed in the NPPES registry for Marcellus Assiago is (801) 288-2634.
- Does Marcellus Assiago accept Medicare?
- Marcellus Assiago is approved to bill Medicare according to CMS PECOS enrollment data (2026.04.01). Confirm current participation with the provider before scheduling.
- Is Marcellus Assiago's NPI active?
- Yes — Marcellus Assiago's NPI (1235348897) is active in the NPPES registry as of the last update on 2024-05-02.
Source: CMS NPPES Data Dissemination (June 2026). NPI Central is not affiliated with CMS. Data is provided as-is from the public registry.