Active NPI
Robert James Hoolsema, M.D.
- Anesthesiology Physician
- Missoula, MT
National Provider Identifier
1528058476
On this page
Key facts
NPPES NPI Registry- Primary specialty
- Anesthesiology Physician
- License
- 8640
- Practice address
- 3550 Mullan Rd
Suite 103
Missoula, MT 59808-5168 - Phone
- (406) 728-8420
- NPI assigned
- Oct 24, 2005
- 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 |
|---|---|---|---|---|
| Anesthesiology Physician | 207L00000X | 8640 | MT | Primary |
Addresses
Primary practice location
3550 Mullan Rd
Suite 103
Missoula, MT 59808-5168
Mailing address
PO Box 17527
Missoula, MT 59808-7527
Phone (406) 728-8420
Other identifiers 1
| Identifier | Type | State | Issuer |
|---|---|---|---|
| 0015130 | Medicaid | MT |
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)
- Enrolled
- Credentials
- Doctor of Medicine
State licenses
| License | State | Type | Specialty |
|---|---|---|---|
| 8640 | MT | MD | Anesthesiology Physician |
Practice roles
| Organization | Specialty | Status | New patients |
|---|---|---|---|
| Ma Critical Care Services, PC | Past | Accepting new patients |
Organizations & group practices 1
Organizations this provider is connected to: Medicare benefit reassignments (the organization bills Medicare for this provider’s services), Care Compare group memberships and National Provider Directory roles.
-
- Critical Care Medicine (Anesthesiology) Physician
- Missoula, MT
- NPI 1114221983
NPI Registry JSON
The complete NPPES record for this NPI in the NPI Registry API format.
{
"created_epoch": "1130112000000",
"enumeration_type": "NPI-1",
"last_updated_epoch": "1783900800000",
"number": "1528058476",
"addresses": [
{
"country_code": "US",
"country_name": "United States",
"address_purpose": "MAILING",
"address_type": "DOM",
"address_1": "PO BOX 17527",
"city": "MISSOULA",
"state": "MT",
"postal_code": "598087527",
"telephone_number": "406-728-8420"
},
{
"country_code": "US",
"country_name": "United States",
"address_purpose": "LOCATION",
"address_type": "DOM",
"address_1": "3550 MULLAN RD",
"address_2": "SUITE 103",
"city": "MISSOULA",
"state": "MT",
"postal_code": "598085168",
"telephone_number": "406-728-8420"
}
],
"practiceLocations": [],
"basic": {
"last_name": "HOOLSEMA",
"first_name": "ROBERT",
"middle_name": "JAMES",
"credential": "M.D.",
"sole_proprietor": "NO",
"sex": "M",
"enumeration_date": "2005-10-24",
"last_updated": "2026-07-13",
"status": "A"
},
"taxonomies": [
{
"code": "207L00000X",
"taxonomy_group": "",
"desc": "Anesthesiology",
"state": "MT",
"license": "8640",
"primary": true
}
],
"identifiers": [
{
"code": "05",
"desc": "MEDICAID",
"issuer": null,
"identifier": "0015130",
"state": "MT"
}
],
"endpoints": [],
"other_names": []
}Other providers in Missoula, MT
Sources for this page
- NPPES NPI Registry (CMS): identity, addresses, specialties, licenses, identifiers and endpoints. Last updated by the provider on Jul 13, 2026; self-reported and not verified by CMS. Specialty names from the NUCC taxonomy.
- National Provider Directory (CMS): practice roles, locations, licenses, networks and endpoints.