NPIMap

Individual provider Active NPI

Tamas Otrok, M.D.

  • Gastroenterology Physician
  • Longmont, CO
National Provider Identifier
1851386734
Registry record updated Mar 6, 2026
On this page

Key facts

NPPES NPI Registry
Primary specialty
Gastroenterology PhysicianTaxonomy code 207RG0100X
License
DR.0055835 Issued in CO
Practice address
1551 Professional LN Unit 290
Longmont, CO 80501-6970
Phone
(303) 604-5000
Fax
(720) 890-0364
NPI assigned
Sep 15, 2005
Last updated
Mar 6, 2026By the provider in NPPES
Sex
Male
Sole proprietor
No

NPPES NPI Registry

Updated by the provider on Mar 6, 2026

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

Specialties & licenses 1

Specialty (taxonomy)CodeLicenseStatePrimary
Gastroenterology Physician 207RG0100X DR.0055835 CO Primary

Addresses

Primary practice location

1551 Professional LN Unit 290
Longmont, CO 80501-6970

Mailing address

382 S Arthur Ave
Louisville, CO 80027-3094
Phone (303) 604-5000

Other identifiers 1

IdentifierTypeStateIssuer
18330258MedicaidCO

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
I20151028001396 CO Practitioner - Gastroenterology 4183697147 Reassigns benefits to 1 organization

Care Compare profile

Medicare Care Compare
Specialty
Gastroenterology
Education
Other, 1993
Medicare assignment
Accepts the Medicare-approved amount as payment in full
Group practices

Practice addresses (Care Compare)

13952 Denver W Pkwy
Suite 100 BLDG 53
Lakewood, CO 80401-3141
Phone (303) 604-5000

Hospital & facility affiliations

Procedures performed for Medicare patients

ProcedureNumber of procedures
Colonoscopy117
Upper gastrointestinal (GI) endoscopy for acid reflux125

National Provider Directory

National Provider Directory
Medicare enrollment (NPD)
Enrolled
Credentials
Doctor of Medicine

State licenses

LicenseStateTypeSpecialty
DR.0055835COMDGastroenterology Physician

Practice roles

OrganizationSpecialtyStatusNew patients
Boulder Valley Gastroenterology Inc. Gastroenterology CurrentSince Nov 2, 2015 Accepting new patients
Boulder Valley Gastroenterology Inc. Gastroenterology CurrentSince Nov 2, 2015 Accepting new patients
The Iowa Clinic Endoscopy Center LLC Current Accepting new patients
Boulder Valley Gastroenterology Inc. Gastroenterology Current Accepting new patients
The Iowa Clinic PC Gastroenterology PastSince Oct 1, 1995 Accepting new patients
The Iowa Clinic, PC Past Accepting new patients

Locations

1755 48th St
Boulder, CO 80301
Phone (303) 494-5263

1755 48th St
Ste 100
Boulder, CO 80301
Phone (720) 932-7714

16677 Lowell Blvd
Broomfield, CO 80023
Phone (303) 415-8829

16677 Lowell Blvd
Ste 200
Broomfield, CO 80023

1830 N Franklin St
Ste 220
Denver, CO 80218

1960 N Ogden St
Denver, CO 80218
Phone (303) 318-1540

1960 N Ogden St
Ste 210
Denver, CO 80218
Phone (303) 832-9277

1000 W South Boulder Rd
Ste 200
Lafayette, CO 80026
Phone (720) 932-7719

13952 Denver West Pkwy
Lakewood, CO 80401
Phone (303) 271-1112

13952 Denver West Pkwy
Ste 100
Lakewood, CO 80401
Phone (303) 271-1112

1551 Professional Ln
Longmont, CO 80501
Phone (303) 776-7582

1551 Professional Ln
Unit 290
Longmont, CO 80501

382 S Arthur Ave
Louisville, CO 80027

382 S Arthur Ave
Unit 100
Louisville, CO 80027

11900 Grant St
Northglenn, CO 80233
Phone (303) 812-5095

11900 Grant St
Ste 290
Northglenn, CO 80233

11900 Grant St
Ste 360
Northglenn, CO 80233
Phone (817) 306-5630

Interoperability endpoints

  • Direct secure messaging: t.otrok@gastrorockies.directbygreenway.com

Organizations & group practices 6

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 35

Hospitals and other facilities this clinician is affiliated with according to Medicare Care Compare.

View all 35

NPI Registry JSON

The complete NPPES record for this NPI in the NPI Registry API format.

{
    "created_epoch": "1126742400000",
    "enumeration_type": "NPI-1",
    "last_updated_epoch": "1772755200000",
    "number": "1851386734",
    "addresses": [
        {
            "country_code": "US",
            "country_name": "United States",
            "address_purpose": "MAILING",
            "address_type": "DOM",
            "address_1": "382 S ARTHUR AVE",
            "city": "LOUISVILLE",
            "state": "CO",
            "postal_code": "800273094",
            "telephone_number": "303-604-5000",
            "fax_number": "720-890-0364"
        },
        {
            "country_code": "US",
            "country_name": "United States",
            "address_purpose": "LOCATION",
            "address_type": "DOM",
            "address_1": "1551 PROFESSIONAL LN UNIT 290",
            "city": "LONGMONT",
            "state": "CO",
            "postal_code": "805016970",
            "telephone_number": "303-604-5000",
            "fax_number": "720-890-0364"
        }
    ],
    "practiceLocations": [],
    "basic": {
        "last_name": "OTROK",
        "first_name": "TAMAS",
        "name_prefix": "Dr.",
        "credential": "M.D.",
        "sole_proprietor": "NO",
        "sex": "M",
        "enumeration_date": "2005-09-15",
        "last_updated": "2026-03-06",
        "certification_date": "2026-03-06",
        "status": "A"
    },
    "taxonomies": [
        {
            "code": "207RG0100X",
            "taxonomy_group": "",
            "desc": "Internal Medicine, Gastroenterology",
            "state": "CO",
            "license": "DR.0055835",
            "primary": true
        }
    ],
    "identifiers": [
        {
            "code": "05",
            "desc": "MEDICAID",
            "issuer": null,
            "identifier": "18330258",
            "state": "CO"
        }
    ],
    "endpoints": [],
    "other_names": []
}

Other providers in Longmont, CO

Sources for this page

Verify at the official NPI Registry.