Kevin Sieja, M.D.

Primary specialty

Gastroenterology PhysicianTaxonomy code 207RG0100X

License

44150 Issued in CO

Practice address

4500 E 9TH Ave Ste 720S
Denver, CO 80220-3926

Phone

(303) 355-3525

Fax

(303) 355-0255

NPI assigned

May 23, 2006

Sex

Male

Sole proprietor

No

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

Specialties & licenses 1

Addresses

Other identifiers 1

Medicare fee-for-service enrollment

Enrolled in CO

Eligible to order & refer

• Part B services: Yes
• Medical equipment: Yes
• Home health: Yes
• Power mobility devices: Yes
• Hospice: Yes

Green means eligible to order or refer.

Enrollment records 1

Specialty

Gastroenterology

Education

Other, 2000

Medicare assignment

Accepts the Medicare-approved amount as payment in full

Group practices

Denver Digestive Health Specialists IncGroup PAC ID 8022090067, 17 clinicians

Colorado Gastroenterology Prof LLCGroup PAC ID 6608846506, 4 clinicians

Colorado Mountain Medical, LLCGroup PAC ID 5496087181, 63 clinicians

Practice addresses (Care Compare)

Hospital & facility affiliations

• Valley View Hospital Association Hospital, Glenwood Springs, CO, CCN 060075
• HCA Healthone Rose Hospital, Denver, CO, CCN 060032
• HCA HealthOne Presbyterian St. Lukes Hospital, Denver, CO, CCN 060014

Procedures performed for Medicare patients

Medicare enrollment (NPD)

Enrolled

Credentials

Doctor of Medicine

State licenses

Practice roles

Locations

Interoperability endpoints

• Direct secure messaging: kevinsieja@coloradomo.allscriptsdirect.net

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.

• Colorado Gastroenterology Prof LLC

  • Gastroenterology Physician
  • Denver, CO
  • NPI 1396790101
  Medicare reassignment Care Compare group Authorized official
• Colorado Mountain Medical, LLC

  • Multi-Specialty Clinic/Center
  • Avon, CO
  • NPI 1730747445

  Gastroenterology

  Medicare reassignment Care Compare group NPD
• Denver Digestive Health Specialists Inc

  • Gastroenterology Physician
  • Denver, CO
  • NPI 1447278981
  Medicare reassignment Care Compare group NPD
• Colorado Mountain Medical, LLC

  • Community/Behavioral Health Agency
  • Edwards, CO
  • NPI 1093328320
  NPD
• Colorado Mountain Medical, LLC

  • Community/Behavioral Health Agency
  • Vail, CO
  • NPI 1326793076
  NPD
• Jonathon J Dormish DPM LLC

  • Foot Surgery Podiatrist
  • Aurora, CO
  • NPI 1932140886
  NPD (past)

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

• HCA Healthone LLC

  dba HCA HealthONE Rose Hospital

  • General Acute Care Hospital
  • Denver, CO
  • NPI 1023062098
  Care Compare affiliation
• HCA Healthone LLC

  dba HCA HealthONE Presbyterian St. Lukes Hospital

  • General Acute Care Hospital
  • Denver, CO
  • NPI 1720038946
  Care Compare affiliation
• Valley View Hospital Association

  dba Valley View Surgery Center at Basalt

  • Ambulatory Surgical Clinic/Center
  • Basalt, CO
  • NPI 1649885849

  Hospital

  Care Compare affiliation
• Valley View Hospital Association

  • General Acute Care Hospital
  • Glenwood Springs, CO
  • NPI 1982668133
  Care Compare affiliation

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

{
    "created_epoch": "1148342400000",
    "enumeration_type": "NPI-1",
    "last_updated_epoch": "1782777600000",
    "number": "1952356677",
    "addresses": [
        {
            "country_code": "US",
            "country_name": "United States",
            "address_purpose": "MAILING",
            "address_type": "DOM",
            "address_1": "4500 E 9TH AVE STE 720S",
            "city": "DENVER",
            "state": "CO",
            "postal_code": "802203926",
            "telephone_number": "303-355-3525",
            "fax_number": "303-355-0255"
        },
        {
            "country_code": "US",
            "country_name": "United States",
            "address_purpose": "LOCATION",
            "address_type": "DOM",
            "address_1": "4500 E 9TH AVE STE 720S",
            "city": "DENVER",
            "state": "CO",
            "postal_code": "802203926",
            "telephone_number": "303-355-3525",
            "fax_number": "303-355-0255"
        }
    ],
    "practiceLocations": [
        {
            "address_1": "50 Buck Creek Rd Ste 200",
            "address_purpose": "LOCATION",
            "city": "Avon",
            "state": "CO",
            "postal_code": "816205428",
            "country_code": "US",
            "telephone_number": "970-926-6340",
            "country_name": "United States",
            "address_type": "DOM"
        },
        {
            "address_1": "180 S Frontage Rd W Ste 5800",
            "address_purpose": "LOCATION",
            "city": "Vail",
            "state": "CO",
            "postal_code": "816575038",
            "country_code": "US",
            "telephone_number": "970-926-6340",
            "country_name": "United States",
            "address_type": "DOM"
        }
    ],
    "basic": {
        "last_name": "SIEJA",
        "first_name": "KEVIN",
        "credential": "M.D.",
        "sole_proprietor": "NO",
        "sex": "M",
        "enumeration_date": "2006-05-23",
        "last_updated": "2026-06-30",
        "certification_date": "2026-06-30",
        "status": "A"
    },
    "taxonomies": [
        {
            "code": "207RG0100X",
            "taxonomy_group": "",
            "desc": "Internal Medicine, Gastroenterology",
            "state": "CO",
            "license": "44150",
            "primary": true
        }
    ],
    "identifiers": [
        {
            "code": "05",
            "desc": "MEDICAID",
            "issuer": null,
            "identifier": "17707757",
            "state": "CO"
        }
    ],
    "endpoints": [],
    "other_names": []
}

• Erin Marie Siegel, LE. CLC, CMA
• Natalie Ann Siegel, SWC
• Samantha Siegel, MA
• Sandra Siegel, PH.D.
• G. Bryan Siegrist, DDS
• Annette C Siemens, FNP
• Leilani Siens
• Sierra Larson Therapy
• Eliana Sierra
• Margie Sierra

• Gastroenterology Physician in Denver, CO
• Providers in Denver, CO by specialty
• Gastroenterology Physician in Colorado

• NPPES NPI Registry (CMS): identity, addresses, specialties, licenses, identifiers and endpoints. Last updated by the provider on Jun 30, 2026; 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.

Verify at the official NPI Registry.