Doctor profile · Federal record
Dr. WILLIAM RIESEN, MD
Internal Medicine Physician (CMS: INTERNAL MEDICINE) · MASON CITY, IA
- NPI 1548377997
- Accepts Medicare
- 33 yrs in practice
- Male
- Group practice
- No sanctions
Practice & contact
- Primary practice
-
1010 4TH ST SW STE 305
MASON CITY, IA 504012801
(641) 428-5700
fax (641) 428-2515 - Mailing address
-
621 S ILLINOIS AVE, SUITE 103
MASON CITY, IA 504015489
Credentials & registration
- NPI registered
- August 2006 — 20 yrs on file
- Profile last updated
- July 14, 2025
- Year of graduation
- 1993 — 33 yrs since
- Specialty taxonomy
- 207R00000X — NUCC code
- State license (1)
- Iowa #31260
- Medicaid
- IA #4137984
Federal sanctions & exclusions
No sanctions, exclusions or revocations on file
Checked against OIG LEIE on NPI 1548377997. Last verified May 11, 2026.Medicare procedures · 2023
Top services delivered
Total services
3,246
Distinct HCPCS
9
Medicare allowed
$154,019
| HCPCS | Description | Services | Patients | Avg allowed | |
|---|---|---|---|---|---|
93010 |
Routine electrocardiogram (ecg) using at least 12 leads with interpretation and report only | 1,406 | 1,092 | $8 | |
99213 |
Established patient office or other outpatient visit, 20-29 minutes | 875 | 412 | $62 | |
99214 |
Established patient office or other outpatient visit, 30-39 minutes | 468 | 304 | $91 | |
99232 |
Subsequent hospital care with moderate levelof medical decision making, if using time, at least 35 minutes | 216 | 64 | $73 | |
G0439 |
Annual wellness visit, includes a personalized prevention plan of service (pps), subsequent visit | 186 | 186 | $120 | |
99238 |
Hospital discharge day management, 30 minutes or less | 56 | 50 | $75 | |
99223 |
Initial hospital care with moderate level of medical decision making, if using time, at least 75 minutes | 15 | 15 | $162 | |
99204 |
New patient office or other outpatient visit, 45-59 minutes | 13 | 13 | $124 | |
99212 |
Established patient office or other outpatient visit, 10-19 minutes | 11 | 11 | $33 |
In context: peer comparison
Among 7 peers in this city , average services per provider: 221. This provider delivers 15× the peer median.Medicare Part D · 2023
Top prescriptions
Total claims
3,142
Patients
805
Total drug cost
$158,873
| Drug | Type | Claims | Patients | Total cost |
|---|---|---|---|---|
| Atorvastatin Calcium | Generic | 428 | 127 | $6,158 |
| Omeprazole | Generic | 298 | 72 | $3,981 |
| Levothyroxine Sodium | Generic | 279 | 76 | $3,683 |
| Lisinopril | Generic | 254 | 67 | $2,157 |
| Losartan Potassium | Generic | 234 | 67 | $3,022 |
| Metoprolol Succinate | Generic | 217 | 60 | $3,989 |
| Eliquis (Apixaban) | Brand | 203 | 27 | $122,997 |
| Gabapentin | Generic | 200 | 48 | $3,434 |
| Amlodipine Besylate | Generic | 198 | 43 | $1,287 |
| Hydrochlorothiazide | Generic | 160 | 47 | $1,242 |