Active NPI
Aaron Grusonik
- Clinical Psychologist
- Fort Harrison, MT
National Provider Identifier
1326908526
On this page
Key facts
NPPES NPI Registry- Primary specialty
- Clinical Psychologist
- License
- PSY-PSY-LIC-5876
- Practice address
- 3687 Veterans Dr
Fort Harrison, MT 59636-9700 - Phone
- (408) 482-0323
- NPI assigned
- Nov 12, 2025
- Last updated
- Nov 12, 2025
- Sex
- Male
- Sole proprietor
- No
NPPES NPI Registry
Registry information is reported by the provider to CMS and is not verified. About this source
Specialties & licenses 1
| Specialty (taxonomy) | Code | License | State | Primary |
|---|---|---|---|---|
| Clinical Psychologist | 103TC0700X | PSY-PSY-LIC-5876 | MT | Primary |
Addresses
Primary practice location
3687 Veterans Dr
Fort Harrison, MT 59636-9700
Mailing address
1240 E 9TH St # 1907
Cleveland, OH 44199-9904
Phone (408) 482-0323
Medicare participation
Medicare enrollment files- Medicare fee-for-service enrollment
- Not listed in the public Medicare enrollment file
National Provider Directory
National Provider Directory- Medicare enrollment (NPD)
- Not enrolled
State licenses
| License | State | Type | Specialty |
|---|---|---|---|
| PSY-PSY-LIC-5876 | MT | MD | Clinical Psychologist |
NPI Registry JSON
The complete NPPES record for this NPI in the NPI Registry API format.
{
"created_epoch": "1762905600000",
"enumeration_type": "NPI-1",
"last_updated_epoch": "1762905600000",
"number": "1326908526",
"addresses": [
{
"country_code": "US",
"country_name": "United States",
"address_purpose": "MAILING",
"address_type": "DOM",
"address_1": "1240 E 9TH ST # 1907",
"city": "CLEVELAND",
"state": "OH",
"postal_code": "441999904",
"telephone_number": "408-482-0323"
},
{
"country_code": "US",
"country_name": "United States",
"address_purpose": "LOCATION",
"address_type": "DOM",
"address_1": "3687 VETERANS DR",
"city": "FORT HARRISON",
"state": "MT",
"postal_code": "596369700",
"telephone_number": "408-482-0323"
}
],
"practiceLocations": [],
"basic": {
"last_name": "GRUSONIK",
"first_name": "AARON",
"name_prefix": "Dr.",
"sole_proprietor": "NO",
"sex": "M",
"enumeration_date": "2025-11-12",
"last_updated": "2025-11-12",
"certification_date": "2025-11-12",
"status": "A"
},
"taxonomies": [
{
"code": "103TC0700X",
"taxonomy_group": "",
"desc": "Psychologist, Clinical",
"state": "MT",
"license": "PSY-PSY-LIC-5876",
"primary": true
}
],
"identifiers": [],
"endpoints": [],
"other_names": []
}Other providers in Fort Harrison, MT
Sources for this page
- NPPES NPI Registry (CMS): identity, addresses, specialties, licenses, identifiers and endpoints. Last updated by the provider on Nov 12, 2025; self-reported and not verified by CMS. Specialty names from the NUCC taxonomy.
- National Provider Directory (CMS): practice roles, locations, licenses, networks and endpoints.