Marcellus Saka Assiago, MD
NPI 1235348897ActiveIndividual· Internal Medicine, Nephrology· Riverton, UT
Internal Medicine, Nephrology (MD) with Nephrology Associates of Utah LLC and 1 other group, practicing in Riverton, Utah. In 2024 Medicare paid $102,236 for 290 patients, and Part D covered 1,080 of their prescriptions, 86% of them generic. Calliditas Therapeutics US Inc. was the largest of 12 companies reporting payments in 2025, $2,688 in all, mostly consulting fees. Lists Intermountain Health Cedar City Hospital and 4 other hospitals as hospital affiliations.
Overview
| NPI | 1235348897 |
|---|---|
| Status | Active |
| Entity type | Individual |
| Credential | MD |
| Sole proprietor | No |
| NPI issued | May 21, 2007 |
| Last updated in NPPES | May 2, 2024 |
| Certified by provider | May 2, 2024 |
Specialties and licenses
| Taxonomy | Code | License | State |
|---|---|---|---|
| Internal Medicine, Nephrology Primary | 207RN0300X | 6856533-1205 | UT |
| Internal Medicine, Nephrology | 207RN0300X | 13068 | NV |
Exclusion screening
| List | Result | Details |
|---|---|---|
| HHS-OIG LEIE · Nov 10, 2026 | No match | Checked by NPI and by name + state |
| North Carolina Medicaid · Nov 11, 2026 | No match | — |
| New York OMIG · Nov 11, 2026 | No match | — |
| Ohio Medicaid · Nov 11, 2026 | No match | — |
| Pennsylvania Medicheck · Nov 11, 2026 | No match | — |
| Washington HCA · Nov 11, 2026 | No match | — |
Official OIG search · How matching works ·Bulk check a roster
Medicare
| Enrollment (PECOS) | Enrolled Practitioner - Nephrology (UT) |
|---|---|
| Accepts assignment | Yes (participating) |
Medicare services in 2024
| Medicare patients | 290 |
|---|---|
| Services billed | 949 across 20 procedure codes |
| Paid by Medicare | $102,236 |
Part D prescriptions in 2024
| Prescriptions (claims) | 1,080 · 2,293 30-day fills |
|---|---|
| Patients | 203 |
| Total drug cost | $121,730 |
| Generic share | 86% of claims |
Education and affiliations
| Graduation year | 1999 |
|---|---|
| Medicare specialty | Nephrology |
| Secondary specialties | Internal Medicine |
| Telehealth | Offers telehealth |
Medical groups
- Nephrology Associates of Utah LLCS Salt Lake, UT · 31 clinicians
- St George Kidney Care LLCCedar City, UT · 8 clinicians
Hospital affiliations
- Intermountain Health Cedar City HospitalCedar City, UT
- Intermountain Health Riverton HospitalRiverton, UT
- Intermountain Medical CenterMurray, UT
- Lds HospitalSalt Lake City, UT
- St Mark's HospitalSalt Lake City, UT
Other facilities
- 462308 Tooele Valley Dialysis CenterDialysis facility · Tooele, UT
- 462532 South Mountain DialysisDialysis facility · South Jordan, UT
- 462545 Liberty Dialysis West Jordan (Fmc)Dialysis facility · West Jordan, UT
- 462546 Fmc-Riverton LLCDialysis facility · Riverton, UT
- 462548-Fmc-Cedar CityDialysis facility · Cedar City, UT
Industry payments (Open Payments)
- 2025$2,688 · 29 payments from 12 companies
- 2024$190.61 · 10 payments from 6 companies
Top paying companies in 2025
| Company | Amount | Payments |
|---|---|---|
| Calliditas Therapeutics US Inc. | $2,145 | 2 |
| Amgen Inc. | $177.79 | 10 |
| Travere Therapeutics, Inc. | $74.34 | 3 |
| Boehringer Ingelheim Pharmaceuticals, Inc. | $69.46 | 4 |
| Ani Pharmaceuticals, Inc. | $53.69 | 2 |
What the 2025 payments were for
- Consulting Fee$2,000 · 1 payment
- Food and Beverage$688.19 · 28 payments
Receiving payments does not imply wrongdoing. What Open Payments covers ·original records
Other nephrologists in Riverton
- 1811375298