NPIMap

Organization Active NPI

Ies Obs Colorado PLLC

  • Emergency Medicine Physician
  • Denver, CO
National Provider Identifier
1235988015
Registry record updated Apr 28, 2026
On this page

Key facts

NPPES NPI Registry
Primary specialty
Emergency Medicine PhysicianTaxonomy code 207P00000X
Legal business name
IES OBS COLORADO PLLC
Practice address
1375 E 19TH Ave
Denver, CO 80218-1114
Phone
(469) 420-5544
NPI assigned
May 15, 2024
Last updated
Apr 28, 2026By the provider in NPPES
Organization subpart
No

NPPES NPI Registry

Updated by the provider on Apr 28, 2026

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

Authorized official

Name
Nestor Zenarosa, MDNPI 1629096375
Title
Owner
Phone
(469) 420-5527

Authorized official NPPES reports the official by name only. The link goes to the one practitioner connected to this organization with that name.

Specialties & licenses 1

Specialty (taxonomy)CodeLicenseStatePrimary
Emergency Medicine PhysicianGroup: 193200000X MULTI-SPECIALTY GROUP 207P00000X Primary

Addresses

Primary practice location

1375 E 19TH Ave
Denver, CO 80218-1114

Mailing address

PO Box 604
Indianapolis, IN 46206-0604
Phone (469) 923-2906

Medicare participation

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

Enrollment records 1

Enrollment IDStateProvider typePAC IDDetails
O20240725000242 CO Part B Supplier - Clinic/Group Practice 7214473388 Receives reassigned benefits from 62 practitioners
Practice locations: Denver, CO

National Provider Directory

National Provider Directory

Practitioners & affiliated clinicians

Practitioners 63

Individual providers connected to this organization through Medicare benefit reassignment, Care Compare group membership or National Provider Directory roles, and the practitioner matching its NPPES authorized official.

View all 63

NPI Registry JSON

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

{
    "created_epoch": "1715731200000",
    "enumeration_type": "NPI-2",
    "last_updated_epoch": "1777334400000",
    "number": "1235988015",
    "addresses": [
        {
            "country_code": "US",
            "country_name": "United States",
            "address_purpose": "MAILING",
            "address_type": "DOM",
            "address_1": "PO BOX 604",
            "city": "INDIANAPOLIS",
            "state": "IN",
            "postal_code": "462060604",
            "telephone_number": "469-923-2906"
        },
        {
            "country_code": "US",
            "country_name": "United States",
            "address_purpose": "LOCATION",
            "address_type": "DOM",
            "address_1": "1375 E 19TH AVE",
            "city": "DENVER",
            "state": "CO",
            "postal_code": "802181114",
            "telephone_number": "469-420-5544"
        }
    ],
    "practiceLocations": [],
    "basic": {
        "organization_name": "IES OBS COLORADO PLLC",
        "organizational_subpart": "NO",
        "enumeration_date": "2024-05-15",
        "last_updated": "2026-04-28",
        "certification_date": "2026-04-28",
        "status": "A",
        "authorized_official_last_name": "ZENAROSA",
        "authorized_official_first_name": "NESTOR",
        "authorized_official_title_or_position": "OWNER",
        "authorized_official_telephone_number": "469-420-5527",
        "authorized_official_credential": "MD"
    },
    "taxonomies": [
        {
            "code": "207P00000X",
            "taxonomy_group": "193200000X MULTI-SPECIALTY GROUP",
            "desc": "Emergency Medicine",
            "state": null,
            "license": null,
            "primary": true
        }
    ],
    "identifiers": [],
    "endpoints": [],
    "other_names": []
}

Other providers in Denver, CO

Sources for this page

  • NPPES NPI Registry (CMS): identity, addresses, specialties, licenses, identifiers and endpoints. Last updated by the provider on Apr 28, 2026; self-reported and not verified by CMS. Specialty names from the NUCC taxonomy.
  • Medicare enrollment (CMS PECOS): enrollments, PAC IDs and benefit reassignments.
  • National Provider Directory (CMS): practice roles, locations, licenses, networks and endpoints.

Verify at the official NPI Registry.