Active NPI
Jeffrey Justin Rentz, M.D.
- Specialist
- Billings, MT
National Provider Identifier
1851363667
On this page
Key facts
NPPES NPI Registry- Primary specialty
- Specialist
- License
- 11279
- Practice address
- 2900 12TH Ave N
Suite 355W
Billings, MT 59101-7506 - Phone
- (406) 238-6470
- Fax
- (406) 238-6499
- NPI assigned
- Feb 6, 2006
- 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 2
| Specialty (taxonomy) | Code | License | State | Primary |
|---|---|---|---|---|
| Surgery Physician | 208600000X | 226178 | MA | |
| Specialist | 174400000X | 11279 | MT | Primary |
Addresses
Primary practice location
2900 12TH Ave N
Suite 355W
Billings, MT 59101-7506
Mailing address
1450 Shade Tree Cir
Billings, MT 59102-7964
Medicare participation
Medicare enrollment files- Medicare fee-for-service enrollment
- Enrolled in MT
- Eligible to order & refer
- Part B services: Yes
- Medical equipment: Yes
- Home health: Yes
- Power mobility devices: Yes
- Hospice: Yes
Enrollment records 1
| Enrollment ID | State | Provider type | PAC ID | Details |
|---|---|---|---|---|
| I20070102000121 | MT | Practitioner - General Surgery | 1456351295 | Reassigns benefits to 1 organization |
Care Compare profile
Medicare Care Compare- Specialty
- General Surgery
- Education
- University of Virginia School of Medicine, 1998
- Medicare assignment
- Accepts the Medicare-approved amount as payment in full
- Group practices
- Surgical Associates, PC
Practice addresses (Care Compare)
2900 12TH Ave N 355
Billings, MT 59101-7590
Phone (406) 238-6470
Hospital & facility affiliations
- Intermountain Health St Vincent Regional Hospital
- Cody Regional Health
Procedures performed for Medicare patients
| Procedure | Number of procedures |
|---|---|
| Colonoscopy | 1-10 |
| Hernia repair - groin (open) | 1-10 |
| Hernia repair (minimally invasive) | 16 |
| Upper gastrointestinal (GI) endoscopy for acid reflux | 26 |
| Melanoma (skin cancer) excision | 1-10 |
National Provider Directory
National Provider Directory- Medicare enrollment (NPD)
- Enrolled
- Credentials
- Doctor of Medicine
State licenses
| License | State | Type | Specialty |
|---|---|---|---|
| 226178 | MA | MD | Registered Nurse |
| 11279 | MT | MD | Specialist |
Practice roles
| Organization | Specialty | Status | New patients |
|---|---|---|---|
| Surgical Associates, PC | Specialist | Current | Accepting new patients |
| SCL Health Montana | Past | Accepting new patients | |
| Frances Mahon Deaconess Hospital | Past | Accepting new patients |
Locations
2900 12th Ave N
Ste 140W
Billings, MT 59101
Phone (406) 237-5050
2900 12th Ave N
Ste 355W
Billings, MT 59101
Phone (406) 238-6470
Organizations & group practices 3
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 Access Hospital
- Glasgow, MT
- NPI 1689685323
-
- General Acute Care Hospital
- Billings, MT
- NPI 1083655997
Hospital & facility affiliations 4
Hospitals and other facilities this clinician is affiliated with according to Medicare Care Compare.
NPI Registry JSON
The complete NPPES record for this NPI in the NPI Registry API format.
{
"created_epoch": "1139184000000",
"enumeration_type": "NPI-1",
"last_updated_epoch": "1757548800000",
"number": "1851363667",
"addresses": [
{
"country_code": "US",
"country_name": "United States",
"address_purpose": "MAILING",
"address_type": "DOM",
"address_1": "1450 SHADE TREE CIR",
"city": "BILLINGS",
"state": "MT",
"postal_code": "591027964"
},
{
"country_code": "US",
"country_name": "United States",
"address_purpose": "LOCATION",
"address_type": "DOM",
"address_1": "2900 12TH AVE N",
"address_2": "SUITE 355W",
"city": "BILLINGS",
"state": "MT",
"postal_code": "591017506",
"telephone_number": "406-238-6470",
"fax_number": "406-238-6499"
}
],
"practiceLocations": [],
"basic": {
"last_name": "RENTZ",
"first_name": "JEFFREY",
"middle_name": "JUSTIN",
"name_prefix": "Dr.",
"credential": "M.D.",
"sole_proprietor": "NO",
"sex": "M",
"enumeration_date": "2006-02-06",
"last_updated": "2025-09-11",
"status": "A"
},
"taxonomies": [
{
"code": "208600000X",
"taxonomy_group": "",
"desc": "Surgery",
"state": "MA",
"license": "226178",
"primary": false
},
{
"code": "174400000X",
"taxonomy_group": "",
"desc": "Specialist",
"state": "MT",
"license": "11279",
"primary": true
}
],
"identifiers": [],
"endpoints": [],
"other_names": []
}Other providers in Billings, MT
Sources for this page
- NPPES NPI Registry (CMS): identity, addresses, specialties, licenses, identifiers and endpoints. Last updated by the provider on Sep 11, 2025; self-reported and not verified by CMS. Specialty names from the NUCC taxonomy.
- Medicare enrollment (CMS PECOS): enrollments, PAC IDs and benefit reassignments; Order and Referring.
- Medicare Care Compare (CMS): clinician profile, group practices, facility affiliations, MIPS scores and star ratings.
- National Provider Directory (CMS): practice roles, locations, licenses, networks and endpoints.