NPIMap

Individual provider Active NPI

Theresa L O'Brien, PA

  • Surgical Physician Assistant
  • Lakewood, CO
National Provider Identifier
1740704980
Registry record updated Feb 9, 2026
On this page

Key facts

NPPES NPI Registry
Primary specialty
Surgical Physician AssistantTaxonomy code 363AS0400X
License
PA.0005941 Issued in CO
Practice address
11750 W 2ND PL Ste 255
Lakewood, CO 80228-1726
Phone
(303) 643-4117
Fax
(720) 321-8041
NPI assigned
Jul 31, 2017
Last updated
Feb 9, 2026By the provider in NPPES
Sex
Female
Sole proprietor
No

NPPES NPI Registry

Updated by the provider on Feb 9, 2026

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

Specialties & licenses 3

Specialty (taxonomy)CodeLicenseStatePrimary
Physician Assistant 363A00000X PA.0005941 CO
Physician Assistant 363A00000X 409923 WI
Surgical Physician Assistant 363AS0400X PA.0005941 CO Primary

Addresses

Primary practice location

11750 W 2ND PL Ste 255
Lakewood, CO 80228-1726

Mailing address

PO Box 5693
Denver, CO 80217-5693
Phone (303) 306-7783

Other practice location 1

7780 S Broadway Ste 350
Littleton, CO 80122-2641
Phone (720) 638-7500

Other practice location 2

2900 W Oklahoma Ave
Milwaukee, WI 53215-4330
Phone (608) 347-1972

Medicare participation

Medicare enrollment files
Medicare fee-for-service enrollment
Enrolled in CO
Eligible to order & refer
  • Part B services
  • Medical equipment
  • Home health
  • Power mobility devices
  • Hospice
Green means eligible to order or refer.

Enrollment records 1

Enrollment IDStateProvider typePAC IDDetails
I20191030001674 CO Practitioner - Physician Assistant 7719219427 Reassigns benefits to 2 organizations

Care Compare profile

Medicare Care Compare
Specialty
Physician Assistant
Education
Other, 2017
Medicare assignment
Accepts the Medicare-approved amount as payment in full
Telehealth
Offers telehealth services
Group practices
Catholic Health Initiatives ColoradoGroup PAC ID 8022927342, 1,230 clinicians

Practice addresses (Care Compare)

11600 W 2ND PL
Lakewood, CO 80228-1527

11650 W 2ND PL
Lakewood, CO 80228-1527

11750 W 2ND PL
Lakewood, CO 80228-1726

14300 Orchard Pkwy
Westminster, CO 80023-9206
Phone (720) 627-0207

14300 Orchard Pkwy Floor 2 Pod
1 Ornh Pain Specialists
Westminster, CO 80023-9206
Phone (303) 661-4100

41 State Hwy 67
Woodland Park, CO 80863-5008
Phone (719) 776-4780

Hospital & facility affiliations

Merit-based Incentive Payment System (MIPS)

Final score
89.06 of 100Reported as group
Quality
89.53
Promoting interoperability
100
Improvement activities
40
Cost
74

National Provider Directory

National Provider Directory
Medicare enrollment (NPD)
Enrolled
Credentials
Physician Assistant

State licenses

LicenseStateTypeSpecialty
409923WIMDPhysician Assistant

Practice roles

OrganizationSpecialtyStatusNew patients
Neurosurgery One PC CurrentSince Dec 1, 2019 Accepting new patients
Catholic Health Initiatives Colorado CurrentSince Nov 1, 2021 Accepting new patients
Catholic Health Initiatives Colorado CurrentSince Nov 1, 2021 Accepting new patients
Neurosurgery One PC CurrentSince Dec 1, 2019 Accepting new patients
Catholic Health Initiatives Colorado Past Accepting new patients

Locations

11750 W 2nd Pl
Ste 255
Lakewood, CO 80228
Phone (303) 629-5600

7780 S Broadway
Ste 350
Littleton, CO 80122
Phone (303) 734-8650

41 State Highway 67
Woodland Park, CO 80863
Phone (719) 686-0551

Organizations & group practices 7

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 11

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": "1501459200000",
    "enumeration_type": "NPI-1",
    "last_updated_epoch": "1770595200000",
    "number": "1740704980",
    "addresses": [
        {
            "country_code": "US",
            "country_name": "United States",
            "address_purpose": "MAILING",
            "address_type": "DOM",
            "address_1": "PO BOX 5693",
            "city": "DENVER",
            "state": "CO",
            "postal_code": "802175693",
            "telephone_number": "303-306-7783",
            "fax_number": "303-306-7753"
        },
        {
            "country_code": "US",
            "country_name": "United States",
            "address_purpose": "LOCATION",
            "address_type": "DOM",
            "address_1": "11750 W 2ND PL STE 255",
            "city": "LAKEWOOD",
            "state": "CO",
            "postal_code": "802281726",
            "telephone_number": "303-643-4117",
            "fax_number": "720-321-8041"
        }
    ],
    "practiceLocations": [
        {
            "address_1": "7780 S Broadway Ste 350",
            "address_purpose": "LOCATION",
            "city": "Littleton",
            "state": "CO",
            "postal_code": "801222641",
            "country_code": "US",
            "telephone_number": "720-638-7500",
            "fax_number": "720-583-6770",
            "country_name": "United States",
            "address_type": "DOM"
        },
        {
            "address_1": "2900 W Oklahoma Ave",
            "address_purpose": "LOCATION",
            "city": "Milwaukee",
            "state": "WI",
            "postal_code": "532154330",
            "country_code": "US",
            "telephone_number": "608-347-1972",
            "country_name": "United States",
            "address_type": "DOM"
        }
    ],
    "basic": {
        "last_name": "O'BRIEN",
        "first_name": "THERESA",
        "middle_name": "L",
        "credential": "PA",
        "sole_proprietor": "NO",
        "sex": "F",
        "enumeration_date": "2017-07-31",
        "last_updated": "2026-02-09",
        "certification_date": "2026-02-09",
        "status": "A"
    },
    "taxonomies": [
        {
            "code": "363A00000X",
            "taxonomy_group": "",
            "desc": "Physician Assistant",
            "state": "CO",
            "license": "PA.0005941",
            "primary": false
        },
        {
            "code": "363A00000X",
            "taxonomy_group": "",
            "desc": "Physician Assistant",
            "state": "WI",
            "license": "409923",
            "primary": false
        },
        {
            "code": "363AS0400X",
            "taxonomy_group": "",
            "desc": "Physician Assistant, Surgical",
            "state": "CO",
            "license": "PA.0005941",
            "primary": true
        }
    ],
    "identifiers": [],
    "endpoints": [],
    "other_names": []
}

Other providers in Lakewood, CO

Sources for this page

Verify at the official NPI Registry.