Doctor profile · Federal record
Dr. William Duff, MD
Nephrology Physician (CMS: Nephrology) · Louisville, KY
- NPI 1366446213
- Accepts Medicare
- 36 yrs in practice
- Male
- Group practice
- No sanctions
Practice & contact
- Primary practice
-
6400 Dutchmans Pkwy, Ste 250
Louisville, KY 402053340
(502) 587-9660
fax (502) 540-5615
Credentials & registration
- NPI registered
- June 2005 — 21 yrs on file
- Profile last updated
- August 29, 2007
- Year of graduation
- 1990 — 36 yrs since
- Specialty taxonomy
- 207RN0300X — NUCC code
- State license (1)
- Kentucky #29503
- Medicaid
- KY #64295033
Federal sanctions & exclusions
No sanctions, exclusions or revocations on file
Checked against OIG LEIE on NPI 1366446213. Last verified May 11, 2026.Medicare procedures · 2023
Top services delivered
Total services
2,227
Distinct HCPCS
10
Medicare allowed
$213,970
| HCPCS | Description | Services | Patients | Avg allowed | |
|---|---|---|---|---|---|
99232 |
Subsequent hospital care with moderate levelof medical decision making, if using time, at least 35 minutes | 816 | 215 | $75 | |
99213 |
Established patient office or other outpatient visit, 20-29 minutes | 454 | 301 | $67 | |
81003 |
Automated urinalysis test | 219 | 175 | $2 | |
90960 |
Dialysis services, 4 or more physician visits per month (20 years or older) | 216 | 25 | $343 | |
99490 |
Chronic care management services, first 20 minutes of clinical staff time directed by health care professional, per calendar month | 96 | 43 | $55 | |
99222 |
Initial hospital care with straightforward or low-level medical decision making, if using time, at least 55 minutes | 88 | 82 | $123 | |
99214 |
Established patient office or other outpatient visit, 30-39 minutes | 85 | 75 | $91 | |
99231 |
Subsequent hospital care with straightforward or low level of medical decision making, per day, if using time, at least 25 minutes | 77 | 29 | $47 | |
99204 |
New patient office or other outpatient visit, 45-59 minutes | 52 | 52 | $152 | |
99221 |
Initial hospital care with straightforward or low level of medical decision making, per day, if using time, at least 40 minutes | 40 | 38 | $79 |
In context: peer comparison
Among 25 peers in Louisville Nephrology Physician, average services per provider: 172. This provider delivers 13× the peer median.Open Payments
Industry payments received
All-time total
$1,586
Transactions
73
Manufacturers
15
| Payer (manufacturer) | Industry | Txns | Amount |
|---|---|---|---|
| Boehringer Ingelheim Pharmaceuticals, INC. | 6 | $306.41 | |
| Amgen INC. | 12 | $243.58 | |
| Bayer Healthcare Pharmaceuticals INC. | 14 | $165.03 | |
| Travere Therapeutics, INC. | 6 | $158.06 | |
| Alexion Pharmaceuticals, INC. | 5 | $116.95 | |
| Mallinckrodt Hospital Products INC. | 4 | $98.56 | |
| Fresenius USA Marketing, INC. | 5 | $84.11 | |
| Vifor Pharma, INC. | 4 | $79.54 | |
| Novartis Pharmaceuticals Corporation | 4 | $78.23 | |
| Otsuka America Pharmaceutical, INC. | 4 | $64.55 | |
| AstraZeneca Pharmaceuticals Lp | 3 | $45.52 | |
| Ardelyx, INC. | 2 | $33.00 | |
| Opko Pharmaceuticals, LLC | 2 | $30.49 | |
| Genzyme Corporation | 1 | $29.26 | |
| Aurinia Pharma U.S., INC. | 1 | $19.38 |
By nature of payment
Medicare Part D · 2023
Top prescriptions
Total claims
1,407
Patients
544
Total drug cost
$54,327
| Drug | Type | Claims | Patients | Total cost |
|---|---|---|---|---|
| Amlodipine Besylate | Generic | 203 | 77 | $1,784 |
| Allopurinol | Generic | 160 | 63 | $2,986 |
| Calcitriol | Generic | 148 | 48 | $2,864 |
| Losartan Potassium | Generic | 140 | 58 | $1,709 |
| Furosemide | Generic | 130 | 54 | $1,009 |
| Torsemide | Generic | 125 | 52 | $3,959 |
| Hydralazine Hcl | Generic | 116 | 48 | $2,448 |
| Lisinopril | Generic | 101 | 38 | $758 |
| Spironolactone | Generic | 71 | 28 | $848 |
| Hydrochlorothiazide | Generic | 42 | 14 | $158 |
Hospital affiliations
Frequently asked questions
What is Dr. William Duff's medical specialty?
Dr. William Duff practices Nephrology Physician in Louisville, KY.
Where does Dr. William Duff practice?
Dr. William Duff practices at 6400 Dutchmans Pkwy, Louisville, KY 402053340. Office phone: 5025879660.
What is Dr. William Duff's NPI?
Dr. William Duff's National Provider Identifier (NPI) is 1366446213, issued by NPPES.
Does Dr. William Duff accept Medicare assignment?
Yes. Dr. William Duff accepts Medicare assignment, meaning Medicare-allowed amounts are accepted as full payment for covered services.
What procedures does Dr. William Duff commonly perform?
Top Medicare-reported procedures in 2023: Subsequent hospital care with moderate levelof medical decision making (HCPCS 99232); Established patient office or other outpatient visit (HCPCS 99213); Automated urinalysis test (HCPCS 81003). Source: CMS Medicare Physician & Other Practitioners file.