Doctor profile · Federal record
Dr. Douglas Duffy, MD
Nephrology Physician · Internal Medicine Physician · Nephrology Physician · Marshfield, WI
- NPI 1366542227
- 20 yrs on file
- Licensed in 2 states
- Male
- Group practice
- No sanctions
Practice & contact
Operates at 2 locations .
- Primary practice
-
1000 N Oak Ave
Marshfield, WI 54449
(715) 387-5345 - Additional location
-
801 Broadway N
Fargo, ND 581023641
(701) 234-2000
Credentials & registration
- NPI registered
- September 2006 — 20 yrs on file
- Profile last updated
- August 1, 2018
- Specialty taxonomy
- 207RN0300X — NUCC code
- State licenses (2)
- Wisconsin #25241 · North Dakota #LT15265
- Medicaid
- WI #30517100
Federal sanctions & exclusions
No sanctions, exclusions or revocations on file
Checked against OIG LEIE on NPI 1366542227. Last verified May 11, 2026.Medicare procedures · 2023
Top services delivered
Total services
29
Distinct HCPCS
1
Medicare allowed
$2,202
| HCPCS | Description | Services | Patients | Avg allowed | |
|---|---|---|---|---|---|
99232 |
Subsequent hospital care with moderate levelof medical decision making, if using time, at least 35 minutes | 29 | 12 | $76 |
In context: peer comparison
Among 5 peers in Marshfield Nephrology Physician, average services per provider: 75. This provider delivers 0.4× the peer median.Frequently asked questions
What is Dr. Douglas Duffy's medical specialty?
Dr. Douglas Duffy practices Nephrology Physician in Marshfield, WI.
Where does Dr. Douglas Duffy practice?
Dr. Douglas Duffy practices at 1000 N Oak Ave, Marshfield, WI 54449. Office phone: 7153875345.
What is Dr. Douglas Duffy's NPI?
Dr. Douglas Duffy's National Provider Identifier (NPI) is 1366542227, issued by NPPES.
What procedures does Dr. Douglas Duffy commonly perform?
Top Medicare-reported procedures in 2023: Subsequent hospital care with moderate levelof medical decision making (HCPCS 99232). Source: CMS Medicare Physician & Other Practitioners file.