Asif Sultan, M.D.
NPI 1821278474ActiveIndividual· Internal Medicine, Nephrology· Knoxville, TN
Internal Medicine, Nephrology (M.D.) with Knoxville Nephrology Associates, LLC, practicing in Knoxville, Tennessee. Their prescriptions cost Medicare Part D more than their services did: $478,965 for 2,968 claims, against $153,866 paid for services in 2024. Calliditas Therapeutics US Inc. was the largest of 9 companies reporting payments in 2025, $536.73 in all, mostly food and beverage. Lists Claiborne Medical Center and 4 other hospitals as hospital affiliations.
Overview
| NPI | 1821278474 |
|---|---|
| Status | Active |
| Entity type | Individual |
| Credential | M.D. |
| Sole proprietor | No |
| NPI issued | Nov 13, 2007 |
| Last updated in NPPES | Nov 13, 2007 |
Specialties and licenses
| Taxonomy | Code | License | State |
|---|---|---|---|
| Internal Medicine, Nephrology Primary | 207RN0300X | 42655 | TN |
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 - Internal Medicine (TN) |
|---|---|
| Accepts assignment | Yes (participating) |
Medicare services in 2024
| Medicare patients | 387 |
|---|---|
| Services billed | 1,629 across 16 procedure codes |
| Paid by Medicare | $153,866 |
Part D prescriptions in 2024
| Prescriptions (claims) | 2,968 · 5,142 30-day fills |
|---|---|
| Patients | 427 |
| Total drug cost | $478,965 |
| Generic share | 84% of claims |
Education and affiliations
| Graduation year | 2005 |
|---|---|
| Medicare specialty | Internal Medicine |
Medical group
- Knoxville Nephrology Associates, LLCKnoxville, TN · 4 clinicians
Hospital affiliations
- Claiborne Medical CenterTazewell, TN
- Fort Sanders Regional Medical CenterKnoxville, TN
- Methodist Medical Center of Oak RidgeOak Ridge, TN
- Morristown Hamblen Hospital AssociationMorristown, TN
- University Health System, IncKnoxville, TN
Other facilities
- Davita Appalachian DialysisDialysis facility · New Tazewell, TN
- Davita Knoxville DialysisDialysis facility · Knoxville, TN
- Davita Morristown DialysisDialysis facility · Morristown, TN
- Fmc Dialysis NewportDialysis facility · Newport, TN
- Fmc MorristownDialysis facility · Morristown, TN
Industry payments (Open Payments)
- 2025$536.73 · 21 payments from 9 companies
- 2024$454.25 · 13 payments from 6 companies
Top paying companies in 2025
| Company | Amount | Payments |
|---|---|---|
| Calliditas Therapeutics US Inc. | $178.85 | 5 |
| Travere Therapeutics, Inc. | $164.25 | 8 |
| Astrazeneca Pharmaceuticals LP | $50.65 | 1 |
| Ardelyx, Inc. | $43.98 | 2 |
| Mallinckrodt Hospital Products Inc. | $22.36 | 1 |
What the 2025 payments were for
- Food and Beverage$536.73 · 21 payments
Receiving payments does not imply wrongdoing. What Open Payments covers ·original records
Other nephrologists in Knoxville
- 1033579867
- 1043217334
- 1104016617
- 1366896334
- 1386870475
- 1538169305
- 1619139383
- 1629061874
- 1821173121
- 1871599084
- 1891962445
- 1467896365
All 25 nephrologists in Knoxville · All nephrologists in Tennessee