Shannon Elise Mackay, DO

Primary specialty

Hospitalist PhysicianTaxonomy code 208M00000X

License

DR.0062368 Issued in CO

Practice address

7700 S Broadway
Littleton, CO 80122

Phone

(303) 730-8900

Fax

(303) 734-2038

NPI assigned

May 5, 2016

Last updated

Oct 9, 2026By the provider in NPPES

Sex

Female

Sole proprietor

Yes

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

Specialties & licenses 2

Addresses

Other identifiers 1

Other names 1

• Dr. Shannon Mazer Former name

Electronic endpoints 2

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

HospitalistAlso: Internal Medicine

Education

Rocky Vista University College of Osteopathic Med, 2016

Medicare assignment

Accepts the Medicare-approved amount as payment in full

Group practices

Portercare Adventist Health SystemGroup PAC ID 0941110886, 770 clinicians

Practice addresses (Care Compare)

Hospital & facility affiliations

• AdventHealth Littleton Hospital, Littleton, CO, CCN 060113
• AdventHealth Porter Hospital, Denver, CO, CCN 060064

Merit-based Incentive Payment System (MIPS)

Final score

85.96 of 100Reported as group

Quality

78.58

Promoting interoperability

100

Improvement activities

40

Cost

74.61

Medicare enrollment (NPD)

Enrolled

Credentials

Doctor of Osteopathy

State licenses

Practice roles

Locations

Interoperability endpoints

• Direct secure messaging: smackay1869305@adventhealth.direct-ci.com

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.

• Portercare Adventist Health System

  dba Affiliated Ear, Nose & Throat Physicians

  • Otolaryngology Physician
  • Greenwood Village, CO
  • NPI 1760761928
  Medicare reassignment Care Compare group NPD
• Portercare Adventist Health System

  dba AdventHealth Medical Group OB/GYN at Cornerstar

  • Obstetrics & Gynecology Physician
  • Aurora, CO
  • NPI 1811289366
  NPD
• Portercare Adventist Health System

  dba AdventHealth Medical Group Urology at Lakewood

  • Urology Physician
  • Lakewood, CO
  • NPI 1942165626
  NPD
• Portercare Adventist Health System

  dba Adventhealth Littleton

  • General Acute Care Hospital
  • Littleton, CO
  • NPI 1689688988
  NPD (past)

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

• Portercare Adventist Health System

  dba AdventHealth West Littleton ER

  • General Acute Care Hospital
  • Littleton, CO
  • NPI 1548800154
  Care Compare affiliation
• Portercare Adventist Health System

  dba Adventhealth Littleton

  • General Acute Care Hospital
  • Littleton, CO
  • NPI 1689688988
  Care Compare affiliation
• Portercare Adventist Health System

  dba South Denver Heart Center

  • General Acute Care Hospital
  • Littleton, CO
  • NPI 1720628332
  Care Compare affiliation
• Portercare Adventist Health System

  dba Adventhealth Porter

  • General Acute Care Hospital
  • Denver, CO
  • NPI 1801800594
  Care Compare affiliation

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

{
    "created_epoch": "1462406400000",
    "enumeration_type": "NPI-1",
    "last_updated_epoch": "1791504000000",
    "number": "1235585548",
    "addresses": [
        {
            "country_code": "US",
            "country_name": "United States",
            "address_purpose": "MAILING",
            "address_type": "DOM",
            "address_1": "7700 S BROADWAY",
            "city": "LITTLETON",
            "state": "CO",
            "postal_code": "801222602",
            "telephone_number": "303-730-8900",
            "fax_number": "303-734-2038"
        },
        {
            "country_code": "US",
            "country_name": "United States",
            "address_purpose": "LOCATION",
            "address_type": "DOM",
            "address_1": "7700 S BROADWAY",
            "city": "LITTLETON",
            "state": "CO",
            "postal_code": "80122",
            "telephone_number": "303-730-8900",
            "fax_number": "303-734-2038"
        }
    ],
    "practiceLocations": [
        {
            "address_1": "10350 E Dakota Ave",
            "address_purpose": "LOCATION",
            "city": "Denver",
            "state": "CO",
            "postal_code": "802471314",
            "country_code": "US",
            "telephone_number": "303-338-4545",
            "country_name": "United States",
            "address_type": "DOM"
        },
        {
            "address_1": "10099 Ridgegate Pkwy Ste 120",
            "address_purpose": "LOCATION",
            "city": "Lone Tree",
            "state": "CO",
            "postal_code": "801245532",
            "country_code": "US",
            "telephone_number": "720-476-3364",
            "country_name": "United States",
            "address_type": "DOM"
        },
        {
            "address_1": "1719 E 19th Ave",
            "address_purpose": "LOCATION",
            "city": "Denver",
            "state": "CO",
            "postal_code": "802181235",
            "country_code": "US",
            "telephone_number": "303-338-4545",
            "country_name": "United States",
            "address_type": "DOM"
        }
    ],
    "basic": {
        "last_name": "MACKAY",
        "first_name": "SHANNON",
        "middle_name": "ELISE",
        "name_prefix": "Dr.",
        "credential": "DO",
        "sole_proprietor": "YES",
        "sex": "F",
        "enumeration_date": "2016-05-05",
        "last_updated": "2026-10-09",
        "certification_date": "2026-10-09",
        "status": "A"
    },
    "taxonomies": [
        {
            "code": "207R00000X",
            "taxonomy_group": "",
            "desc": "Internal Medicine",
            "state": "CO",
            "license": "DR.0062368",
            "primary": false
        },
        {
            "code": "208M00000X",
            "taxonomy_group": "",
            "desc": "Hospitalist",
            "state": "CO",
            "license": "DR.0062368",
            "primary": true
        }
    ],
    "identifiers": [
        {
            "code": "05",
            "desc": "MEDICAID",
            "issuer": null,
            "identifier": "9000158739",
            "state": "CO"
        }
    ],
    "endpoints": [
        {
            "endpointType": "SOAP",
            "endpointTypeDescription": "SOAP URL",
            "endpoint": "https://careepiceast.kp.org:14430/Interconnect-prodcom/wcf/epic.community.hie/xcpdrespondinggatewaysync.svc/ceq",
            "affiliation": "N",
            "endpointDescription": "Carequality",
            "use": "HIE",
            "useDescription": "Health Information Exchange (HIE)",
            "contentType": "OTHER",
            "contentTypeDescription": "Other",
            "contentOtherDescription": "C-CDA",
            "address_1": "1719 E 19th Ave",
            "city": "Denver",
            "state": "CO",
            "country_code": "US",
            "postal_code": "802181235",
            "country_name": "United States",
            "address_type": "DOM"
        },
        {
            "endpointType": "SOAP",
            "endpointTypeDescription": "SOAP URL",
            "endpoint": "https://careepiceast.kp.org:14430/Interconnect-prodcom/wcf/epic.community.hie/xcpdrespondinggatewaysync.svc/ceq",
            "affiliation": "N",
            "endpointDescription": "Carequality",
            "use": "HIE",
            "useDescription": "Health Information Exchange (HIE)",
            "contentType": "OTHER",
            "contentTypeDescription": "Other",
            "contentOtherDescription": "C-CDA",
            "address_1": "10350 E Dakota Ave",
            "city": "Denver",
            "state": "CO",
            "country_code": "US",
            "postal_code": "802471314",
            "country_name": "United States",
            "address_type": "DOM"
        }
    ],
    "other_names": [
        {
            "first_name": "SHANNON",
            "last_name": "MAZER",
            "prefix": "DR.",
            "credential": "DO",
            "code": "1",
            "type": "Former Name"
        }
    ]
}

• Lee A Macdonald, MD
• Joel A Macfarland, LCSW
• Fatima Maciel Vargas
• Mary Denise Mack
• Taylor Renae Mack
• Rima L. Mackelburger
• Mason James Mackey
• Wendy S Maclean, DO
• Bruce Ronald Macmillan, M.A., LPC
• Robert D Madden, D.D.S., M.B.A.

• Hospitalist Physician in Littleton, CO
• Providers in Littleton, CO by specialty
• Hospitalist Physician in Colorado

• NPPES NPI Registry (CMS): identity, addresses, specialties, licenses, identifiers and endpoints. Last updated by the provider on Oct 9, 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.