Individual provider Active NPI

Timothy Unterreiner, DNP

  • Certified Registered Nurse Anesthetist
  • Montgomery, OH
National Provider Identifier
1154214096
Registry record updated May 30, 2025
On this page

Key facts

NPPES NPI Registry
Primary specialty
Certified Registered Nurse AnesthetistTaxonomy code 367500000X
License
APRN.CRNA.0021331 Issued in OH
Practice address
10500 Montgomery Rd
Montgomery, OH 45242-4402
Phone
(513) 865-1111
NPI assigned
May 30, 2025
Last updated
May 30, 2025By the provider in NPPES
Sex
Male
Sole proprietor
Yes

NPPES NPI Registry

Updated by the provider on May 30, 2025

Registry information is reported by the provider to CMS and is not verified. About this source

Specialties & licenses 1

Specialty (taxonomy)CodeLicenseStatePrimary
Certified Registered Nurse Anesthetist 367500000X APRN.CRNA.0021331 OH Primary

Addresses

Primary practice location

10500 Montgomery Rd
Montgomery, OH 45242-4402

Mailing address

PO Box 632572
Cincinnati, OH 45263-2572

Medicare participation

Medicare enrollment files
Medicare fee-for-service enrollment
Enrolled in OH

Enrollment records 1

Enrollment IDStateProvider typePAC IDDetails
I20250627001243 OH Practitioner - Certified Registered Nurse Anesthetist (Crna) 5890208417 Reassigns benefits to 1 organization

Care Compare profile

Medicare Care Compare
Specialty
Certified Registered Nurse Anesthetist (Crna)
Education
Other, 2025
Medicare assignment
Accepts the Medicare-approved amount as payment in full
Group practices
Anesthesia Group Practice IncGroup PAC ID 1254245137, 396 clinicians

Practice addresses (Care Compare)

10500 Montgomery Rd
Montgomery, OH 45242-4402
Phone (513) 865-1111

Hospital & facility affiliations

National Provider Directory

National Provider Directory
Medicare enrollment (NPD)
Enrolled

State licenses

LicenseStateTypeSpecialty
APRN.CRNA.0021331OHMDCertified Registered Nurse Anesthetist

Practice roles

OrganizationSpecialtyStatusNew patients
Anesthesia Group Practice, Inc Nurse Anesthetist, Certified Registered CurrentSince Jul 1, 2025 Accepting new patients

Locations

10500 Montgomery Rd
Montgomery, OH 45242
Phone (513) 557-3206

110 N Poplar St
Oxford, OH 45056
Phone (513) 523-2111

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, National Provider Directory roles and organizations whose NPPES authorized official is this provider.

Hospital & facility affiliations 1

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": "1748563200000",
    "enumeration_type": "NPI-1",
    "last_updated_epoch": "1748563200000",
    "number": "1154214096",
    "addresses": [
        {
            "country_code": "US",
            "country_name": "United States",
            "address_purpose": "MAILING",
            "address_type": "DOM",
            "address_1": "PO BOX 632572",
            "city": "CINCINNATI",
            "state": "OH",
            "postal_code": "452632572"
        },
        {
            "country_code": "US",
            "country_name": "United States",
            "address_purpose": "LOCATION",
            "address_type": "DOM",
            "address_1": "10500 MONTGOMERY RD",
            "city": "MONTGOMERY",
            "state": "OH",
            "postal_code": "452424402",
            "telephone_number": "513-865-1111"
        }
    ],
    "practiceLocations": [],
    "basic": {
        "last_name": "UNTERREINER",
        "first_name": "TIMOTHY",
        "name_prefix": "Dr.",
        "credential": "DNP",
        "sole_proprietor": "YES",
        "sex": "M",
        "enumeration_date": "2025-05-30",
        "last_updated": "2025-05-30",
        "certification_date": "2025-05-30",
        "status": "A"
    },
    "taxonomies": [
        {
            "code": "367500000X",
            "taxonomy_group": "",
            "desc": "Nurse Anesthetist, Certified Registered",
            "state": "OH",
            "license": "APRN.CRNA.0021331",
            "primary": true
        }
    ],
    "identifiers": [],
    "endpoints": [],
    "other_names": []
}

Other providers in Montgomery, OH

Sources for this page

  • NPPES NPI Registry (CMS): identity, addresses, specialties, licenses, identifiers and endpoints. Last updated by the provider on May 30, 2025; self-reported and not verified by CMS. Specialty names from the NUCC taxonomy.
  • Medicare enrollment (CMS PECOS): enrollments, PAC IDs and benefit reassignments.
  • 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.

Verify at the official NPI Registry.