Doctor profile · Federal record
Dr. Koen Nieman, MD
Cardiovascular Disease Physician (CMS: Cardiovascular Disease (Cardiology)) · Specialist · Stanford, CA
- NPI 1144778143
- Accepts Medicare
- MIPS 75.5 / 100 · 2023
- 28 yrs in practice
- Licensed in 2 states
- Male
- Group practice
- No sanctions
Practice & contact
- Primary practice
-
300 Pasteur Dr
Stanford, CA 943052200
(650) 723-4000
Credentials & registration
- NPI registered
- September 2016 — 10 yrs on file
- Profile last updated
- April 24, 2024
- Year of graduation
- 1998 — 28 yrs since
- Specialty taxonomy
- 207RC0000X — NUCC code
- State licenses (2)
- California #A174597 · ZZ #29048831401
Federal sanctions & exclusions
No sanctions, exclusions or revocations on file
Checked against OIG LEIE on NPI 1144778143. Last verified May 11, 2026.Medicare procedures · 2023
Top services delivered
Total services
3,680
Distinct HCPCS
10
Medicare allowed
$189,268
| HCPCS | Description | Services | Patients | Avg allowed | |
|---|---|---|---|---|---|
93306 |
Ultrasound of heart with color-depicted blood flow, rate, direction and valve function | 956 | 931 | $79 | |
93010 |
Routine electrocardiogram (ecg) using at least 12 leads with interpretation and report only | 786 | 637 | $9 | |
93321 |
Ultrasound of heart blood flow, valves and chambers, follow-up | 305 | 292 | $8 | |
93308 |
Ultrasound of heart, follow-up | 269 | 257 | $29 | |
93306 |
Ultrasound of heart with color-depicted blood flow, rate, direction and valve function | 185 | 185 | $203 | |
93325 |
Ultrasound of heart with color-depicted blood flow, rate and valve function | 177 | 174 | $4 | |
93350 |
Ultrasound of heart during rest, exercise and/or drug-induced stress with report | 166 | 166 | $79 | |
93016 |
Exercise or drug-induced heart stress test with electrocardiogram (ecg) with supervision by physician | 158 | 157 | $25 | |
93018 |
Exercise or drug-induced heart stress test with electrocardiogram (ecg) with review by physician | 140 | 140 | $16 | |
93320 |
Ultrasound of heart blood flow, valves and chambers | 129 | 128 | $21 |
In context: peer comparison
Among 33 peers in Stanford Cardiovascular Disease Physician, average services per provider: 162. This provider delivers 23× the peer median.Open Payments
Industry payments received
All-time total
$5,011
Transactions
7
Manufacturers
4
| Payer (manufacturer) | Industry | Txns | Amount |
|---|---|---|---|
| Novartis Pharmaceuticals Corporation | 2 | $4,640.05 | |
| Cleerly, INC. | 2 | $195.72 | |
| Siemens Medical Solutions USA, INC. | 2 | $150.49 | |
| Heartflow, INC. | 1 | $24.43 |
By nature of payment
Medicare Part D · 2023
Top prescriptions
Total claims
129
Patients
11
Total drug cost
$17,875
| Drug | Type | Claims | Patients | Total cost |
|---|---|---|---|---|
| Atorvastatin Calcium | Generic | 31 | 11 | $625 |
| Lisinopril | Generic | 20 | 0 | $167 |
| Metoprolol Succinate | Generic | 18 | 0 | $198 |
| Carvedilol | Generic | 17 | 0 | $383 |
| Amlodipine Besylate | Generic | 16 | 0 | $125 |
| Losartan Potassium | Generic | 14 | 0 | $139 |
| Eliquis (Apixaban) | Brand | 13 | 0 | $16,237 |
Hospital affiliations
Frequently asked questions
What is Dr. Koen Nieman's medical specialty?
Dr. Koen Nieman practices Cardiovascular Disease Physician in Stanford, CA.
Where does Dr. Koen Nieman practice?
Dr. Koen Nieman practices at 300 Pasteur Dr, Stanford, CA 943052200. Office phone: 6507234000.
What is Dr. Koen Nieman's NPI?
Dr. Koen Nieman's National Provider Identifier (NPI) is 1144778143, issued by NPPES.
Does Dr. Koen Nieman accept Medicare assignment?
Yes. Dr. Koen Nieman accepts Medicare assignment, meaning Medicare-allowed amounts are accepted as full payment for covered services.
What procedures does Dr. Koen Nieman commonly perform?
Top Medicare-reported procedures in 2023: Ultrasound of heart with color-depicted blood flow, rate, direction and valve function (HCPCS 93306); Routine electrocardiogram (ecg) using at least 12 leads with interpretation and report only (HCPCS 93010); Ultrasound of heart blood flow, valves and chambers, follow-up (HCPCS 93321). Source: CMS Medicare Physician & Other Practitioners file.