Doctor profile · Federal record
Dr. Gregory Hahn, DO
Psychiatry Physician (CMS: Psychiatry) · Merriam, KS
- NPI 1972702215
- Accepts Medicare
- 19 yrs in practice
- Male
- Group practice
- No sanctions
Practice & contact
- Primary practice
-
9100 W 74Th St
Merriam, KS 662044004
(913) 663-2642
fax (913) 632-2696
Credentials & registration
- NPI registered
- July 2007 — 19 yrs on file
- Profile last updated
- September 5, 2025
- Year of graduation
- 2007 — 19 yrs since
- Specialty taxonomy
- 2084P0800X — NUCC code
- State license (1)
- Kansas #05-39922
Federal sanctions & exclusions
No sanctions, exclusions or revocations on file
Checked against OIG LEIE on NPI 1972702215. Last verified May 11, 2026.Medicare procedures · 2023
Top services delivered
Total services
615
Distinct HCPCS
7
Medicare allowed
$67,964
| HCPCS | Description | Services | Patients | Avg allowed | |
|---|---|---|---|---|---|
99214 |
Established patient office or other outpatient visit, 30-39 minutes | 314 | 117 | $119 | |
99232 |
Subsequent hospital care with moderate levelof medical decision making, if using time, at least 35 minutes | 98 | 43 | $74 | |
99239 |
Hospital discharge day management, more than 30 minutes | 65 | 58 | $109 | |
90833 |
Psychotherapy with evaluation and management visit, 30 minutes | 59 | 42 | $67 | |
90792 |
Psychiatric diagnostic evaluation with medical services | 30 | 30 | $167 | |
99233 |
Subsequent hospital care with moderate levelof medical decision making, if using time, at least 50 minutes | 25 | 17 | $114 | |
90792 |
Psychiatric diagnostic evaluation with medical services | 24 | 24 | $189 |
In context: peer comparison
Among 3 peers in Merriam Psychiatry Physician, average services per provider: 63. This provider delivers 9.8× the peer median.Medicare Part D · 2023
Top prescriptions
Total claims
2,081
Patients
466
Total drug cost
$53,594
| Drug | Type | Claims | Patients | Total cost |
|---|---|---|---|---|
| Clonazepam | Generic | 304 | 59 | $3,252 |
| Trazodone Hcl | Generic | 240 | 65 | $2,599 |
| Quetiapine Fumarate | Generic | 177 | 30 | $3,747 |
| Duloxetine Hcl | Generic | 174 | 37 | $6,144 |
| Alprazolam | Generic | 159 | 27 | $1,073 |
| Bupropion Xl (Bupropion Hcl) | Brand | 147 | 33 | $5,581 |
| Mirtazapine | Generic | 125 | 27 | $2,838 |
| Buspirone Hcl | Generic | 119 | 26 | $4,097 |
| Escitalopram Oxalate | Generic | 114 | 25 | $1,722 |
| Aripiprazole | Generic | 94 | 26 | $14,481 |
Hospital affiliations
Frequently asked questions
What is Dr. Gregory Hahn's medical specialty?
Dr. Gregory Hahn practices Psychiatry Physician in Merriam, KS.
Where does Dr. Gregory Hahn practice?
Dr. Gregory Hahn practices at 9100 W 74Th St, Merriam, KS 662044004. Office phone: 9136632642.
What is Dr. Gregory Hahn's NPI?
Dr. Gregory Hahn's National Provider Identifier (NPI) is 1972702215, issued by NPPES.
Does Dr. Gregory Hahn accept Medicare assignment?
Yes. Dr. Gregory Hahn accepts Medicare assignment, meaning Medicare-allowed amounts are accepted as full payment for covered services.
What procedures does Dr. Gregory Hahn commonly perform?
Top Medicare-reported procedures in 2023: Established patient office or other outpatient visit (HCPCS 99214); Subsequent hospital care with moderate levelof medical decision making (HCPCS 99232); Hospital discharge day management (HCPCS 99239). Source: CMS Medicare Physician & Other Practitioners file.