THOMAS D MACKENZIE MD
NPI 1821007741
Internal Medicine in Denver, CO
About Thomas D Mackenzie Md NPPES
Official registry information on file with the National Plan and Provider Enumeration System.
THOMAS D MACKENZIE MD (NPI 1821007741) is an individual internal medicine provider in Denver, Colorado, licensed in Colorado (30983) and active in the NPI registry since August 2006. He is enrolled in Medicare PECOS and is a graduate of Washington University School Of Medicine (1989).
NPPES Registry Identity
Specialties & Licenses 2
Other Identifiers 2
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
Thomas D Mackenzie Md 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 Thomas Mackenzie reassigns Medicare billing to 1 organization. The organization bills Medicare for the services this provider delivers there.
Denver, CO 80204
- Reassigned Medicare billing, Colorado enrollment
- 2,259 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.
Physician Visit Costs CMS claims · ZIP area
Typical Medicare office-visit costs in the 80204 ZIP code area, from fee-for-service claims. These are area statistics, not this provider’s prices; actual charges vary by service and coverage.
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.
DENVER, CO 80204
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 Thomas Mackenzie's NPI number?
The NPI number for Thomas Mackenzie is 1821007741. It was assigned to this individual provider in the NPPES registry on August 7, 2006.
Where is Thomas Mackenzie located?
Thomas Mackenzie practices at 777 Bannock St Mc 7782, Denver, CO 80204. The listed phone number is (303) 436-6000.
What is Thomas Mackenzie's specialty?
The primary specialty registered for this NPI is Internal Medicine with taxonomy code 207R00000X.
Is Thomas Mackenzie enrolled in Medicare?
Yes. Thomas Mackenzie 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 Thomas Mackenzie's services?
According to the CMS Revalidation Reassignment List (October 2026 release), Thomas Mackenzie reassigns Medicare benefits to Denver Health And Hospital Authority (Denver, 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 Thomas Mackenzie'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 Thomas Mackenzie was last updated on May 22, 2024. NPI Profile syncs weekly with the NPPES registry data releases published by CMS. This NPI record was last updated 2 years 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.
# Thomas D Mackenzie, MD · NPI 1821007741
Internal Medicine physician in Denver, Colorado. Individual provider, active in the CMS NPPES registry since August 7, 2006.
## Identity
- **NPI:** 1821007741 (Entity type: Individual)
- **Enumerated:** August 7, 2006
- **Primary specialty:** Internal Medicine · taxonomy 207R00000X
- **State license:** 30983 (Colorado)
- **Sole proprietor:** No
## Practice location
- **Address:** 777 BANNOCK ST, MC 7782, Denver, CO 80204-4507
- **Phone:** (303) 436-6000
## 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:** Denver Health And Hospital Authority (NPI 1477569838, Denver, CO), under Medicare reassignment (form CMS-855R) · CMS Revalidation Reassignment List, October 2026 release
- **Medical school:** Washington University School Of Medicine, class of 1989
## Record status
- **NPPES last updated:** May 22, 2024
- **Other identifiers:** Other 110225703 (CO); Medicaid 01309830 (CO)
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Source: [NPI Profile](https://npiprofile.com/npi/1821007741) · Data from the CMS NPPES public registry.