Doctor profile · Federal record
Dr. Mary Nielsen, M.D.
Psychiatry Physician · Clayton, MO
- NPI 1972645240
- 19 yrs on file
- Female
- Solo practice
- No sanctions
Practice & contact
- Primary practice
-
225 S Meramec Ave, Suite 932T
Clayton, MO 631053511
(314) 721-7550
fax (314) 863-2114
Credentials & registration
- NPI registered
- February 2007 — 19 yrs on file
- Profile last updated
- July 8, 2007
- Specialty taxonomy
- 2084P0800X — NUCC code
- State license (1)
- Missouri #MDR7P10
- Medicaid
- MO #F31343
Federal sanctions & exclusions
No sanctions, exclusions or revocations on file
Checked against OIG LEIE on NPI 1972645240. Last verified May 11, 2026.Medicare procedures · 2023
Top services delivered
Total services
416
Distinct HCPCS
2
Medicare allowed
$31,910
| HCPCS | Description | Services | Patients | Avg allowed | |
|---|---|---|---|---|---|
90833 |
Psychotherapy with evaluation and management visit, 30 minutes | 227 | 25 | $68 | |
99213 |
Established patient office or other outpatient visit, 20-29 minutes | 189 | 24 | $88 |
In context: peer comparison
Among 1 peers in this city , average services per provider: 208. This provider delivers 2.0× the peer median.Medicare Part D · 2023
Top prescriptions
Total claims
306
Patients
0
Total drug cost
$12,664
| Drug | Type | Claims | Patients | Total cost |
|---|---|---|---|---|
| Quetiapine Fumarate | Generic | 41 | 0 | $529 |
| Alprazolam | Generic | 27 | 0 | $362 |
| Mirtazapine | Generic | 27 | 0 | $1,547 |
| Trazodone Hcl | Generic | 25 | 0 | $382 |
| Bupropion Xl (Bupropion Hcl) | Brand | 23 | 0 | $964 |
| Clonazepam | Generic | 22 | 0 | $261 |
| Duloxetine Hcl | Generic | 19 | 0 | $450 |
| Chlordiazepoxide Hcl | Generic | 17 | 0 | $680 |
| Escitalopram Oxalate | Generic | 17 | 0 | $238 |
| Aripiprazole | Generic | 16 | 0 | $228 |
Frequently asked questions
What is Dr. Mary Nielsen's medical specialty?
Dr. Mary Nielsen practices Psychiatry Physician in Clayton, MO.
Where does Dr. Mary Nielsen practice?
Dr. Mary Nielsen practices at 225 S Meramec Ave, Clayton, MO 631053511. Office phone: 3147217550.
What is Dr. Mary Nielsen's NPI?
Dr. Mary Nielsen's National Provider Identifier (NPI) is 1972645240, issued by NPPES.
What procedures does Dr. Mary Nielsen commonly perform?
Top Medicare-reported procedures in 2023: Psychotherapy with evaluation and management visit (HCPCS 90833); Established patient office or other outpatient visit (HCPCS 99213). Source: CMS Medicare Physician & Other Practitioners file.