DR. SHANNON ELISE MACKAY DO
NPI 1235585548
Hospitalist in Littleton, CO
About Dr. Shannon Elise Mackay Do NPPES
Official registry information on file with the National Plan and Provider Enumeration System.
DR. SHANNON ELISE MACKAY DO (NPI 1235585548) is an individual hospitalist provider in Littleton, Colorado, licensed in Colorado (DR.0062368) and active in the NPI registry since May 2016. She is enrolled in Medicare PECOS, maintains 3 additional practice locations, and is a graduate of Rocky Vista University College Of Osteopathic Med (2016).
NPPES Registry Identity
Specialties & Licenses 2
Other Names 1
Secondary Practice Locations 3
Other Identifiers 1
Medicare Participation & PECOS CMS
Medicare enrollment, assignment, billing reassignment, and ordering and referring status from CMS.
Medicare Enrollment Status
Enrolled in Medicare and accepts Medicare assignment
Dr. Shannon Elise Mackay Do is registered in PECOS and agrees to accept the Medicare-approved amount as full payment. Medicare patients are not billed beyond the standard deductible and coinsurance.
Medicare Billing Reassignment
Medicare enrollment records show Shannon Mackay reassigns Medicare billing to 1 organization. The organization bills Medicare for the services this provider delivers there.
Littleton, CO 80122
- Reassigned Medicare billing, Colorado enrollment
- 733 clinicians in this Medicare group
Source: CMS Revalidation Reassignment List, October 2026 release. Reassignment records can lag staffing changes; confirm a current affiliation with the organization.
Areas of Expertise CMS Part B claims 5
Services this provider delivered to Medicare fee-for-service patients, from the CMS Medicare utilization data. Higher counts generally reflect more experience with a service; care delivered outside Medicare is not included.
Physician Visit Costs CMS claims · ZIP area
Typical Medicare office-visit costs in the 80122 ZIP code area, from fee-for-service claims. These are area statistics, not this provider’s prices; actual charges vary by service and coverage.
Medicare Quality Performance CMS QPP · MIPS
Performance in the CMS Quality Payment Program: the MIPS final score across four weighted categories, and the individual quality measures reported to Medicare.
Referred Medical Equipment & Supplies CMS DME claims 3
Durable medical equipment, devices and supplies this provider ordered from DME suppliers for patients, from Medicare fee-for-service claims.
Other Providers at the Same Location NPPES 20
Providers registered at the same practice address, or within the immediate area, according to the NPPES registry.
LITTLETON, CO 80122
LITTLETON, CO 80122
Frequently Asked Questions NPPES & CMS
Common questions about this NPI record, answered from the official NPPES registry and CMS datasets shown on this page.
What is Shannon Mackay's NPI number?
The NPI number for Shannon Mackay is 1235585548. It was assigned to this individual provider in the NPPES registry on May 5, 2016. The provider is also known as Dr. Shannon Mazer Do.
Where is Shannon Mackay located?
Shannon Mackay practices at 7700 S Broadway, Littleton, CO 80122. The listed phone number is (303) 730-8900.
What is Shannon Mackay's specialty?
The primary specialty registered for this NPI is Hospitalist with taxonomy code 208M00000X.
Is Shannon Mackay enrolled in Medicare?
Yes. Shannon Mackay is registered in the Medicare PECOS system and accepts Medicare assignment, which means accepting the Medicare-approved amount as payment in full for covered services.
Which organization bills Medicare for Shannon Mackay's services?
According to the CMS Revalidation Reassignment List (October 2026 release), Shannon Mackay reassigns Medicare benefits to Portercare Adventist Health System (Littleton, CO). The reassignment is filed with Medicare on form CMS-855R, signed by both the clinician and the organization, and lets the organization bill Medicare and receive payment for Shannon Mackay's services. Reassignment records can lag staffing changes; confirm current arrangements with the organization.
When was this NPI record last updated?
The NPPES record for Shannon Mackay was last updated on October 9, 2026. NPI Profile syncs weekly with the NPPES registry data releases published by CMS. This NPI record was last updated 14 days ago. If this record has changed at CMS more recently, you can request an on-demand re-check against the live CMS registry, directly from this page.
# Dr. Shannon Elise Mackay, DO · NPI 1235585548
Hospitalist physician in Littleton, Colorado. Individual provider, active in the CMS NPPES registry since May 5, 2016.
## Identity
- **NPI:** 1235585548 (Entity type: Individual)
- **Enumerated:** May 5, 2016
- **Primary specialty:** Hospitalist · taxonomy 208M00000X
- **State license:** DR.0062368 (Colorado)
- **Sole proprietor:** Yes
## Practice location
- **Address:** 7700 S BROADWAY, Littleton, CO 80122
- **Phone:** (303) 730-8900 · **Fax:** (303) 734-2038
## Medicare
- **Medicare:** Enrolled (PECOS); accepts Medicare assignment
- **Ordering & referring:** eligible for Part B labs & imaging, durable medical equipment, home health, power mobility devices
- **Bills Medicare through:** Portercare Adventist Health System (NPI 1164389177, Littleton, CO), under Medicare reassignment (form CMS-855R) · CMS Revalidation Reassignment List, October 2026 release
- **Medical school:** Rocky Vista University College Of Osteopathic Med, class of 2016
## Record status
- **NPPES last updated:** October 9, 2026
- **Other identifiers:** Medicaid 9000158739 (CO)
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Source: [NPI Profile](https://npiprofile.com/npi/1235585548) · Data from the CMS NPPES public registry.