DR. CHRISTIAAN ANDERSON REES MD, PHD
NPI 1831726405
Internal Medicine - Critical Care Medicine in Aurora, CO
About Dr. Christiaan Anderson Rees Md, Phd NPPES
Official registry information on file with the National Plan and Provider Enumeration System.
DR. CHRISTIAAN ANDERSON REES MD, PHD (NPI 1831726405) is an individual critical care medicine provider in Aurora, Colorado, licensed in Colorado (DR.0071079) and active in the NPI registry since March 2020. He is enrolled in Medicare PECOS, maintains 5 additional practice locations, and is a graduate of Other (2018).
NPPES Registry Identity
Specialties & Licenses 4
Secondary Practice Locations 5
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. Christiaan Anderson Rees Md, Phd 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 Reassignments
3Medicare enrollment records show Christiaan Rees reassigns Medicare billing to 3 organizations. Each organization bills Medicare for the services this provider delivers there; the nearest is listed first.
Greenwood Village, CO 80111
- Reassigned Medicare billing, Colorado enrollment
- Medicare enrollment name: Critical Care & Pulmonary Consultants, P.C.
- 160 clinicians in this Medicare group
Lakewood, CO 80228
- Reassigned Medicare billing, Colorado enrollment
- 67 clinicians in this Medicare group
Bloomfield, NM 87413
- Reassigned Medicare billing, Texas enrollment
- 572 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 2
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 80045 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.
AURORA, CO 80045
AURORA, CO 80045
AURORA, CO 80045
AURORA, CO 80045
AURORA, CO 80045
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 Christiaan Rees's NPI number?
The NPI number for Christiaan Rees is 1831726405. It was assigned to this individual provider in the NPPES registry on March 24, 2020.
Where is Christiaan Rees located?
Christiaan Rees practices at 13001 E 17th Pl, Aurora, CO 80045. The listed phone number is (603) 276-8704.
What is Christiaan Rees's specialty?
The primary specialty registered for this NPI is Internal Medicine, specializing in Critical Care Medicine, with taxonomy code 207RC0200X.
Is Christiaan Rees enrolled in Medicare?
Yes. Christiaan Rees 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 organizations bill Medicare for Christiaan Rees's services?
According to the CMS Revalidation Reassignment List (October 2026 release), Christiaan Rees reassigns Medicare benefits to 3 organizations: Critical Care & Pulmonary Consultants, PC (Greenwood Village, CO), Critical Care Pulmonary And Sleep Associates Professional LLP (Lakewood, CO) and Dhhs, Phs, Naihs, Shiprock Hospital (Bloomfield, NM). Each 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 Christiaan Rees'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 Christiaan Rees was last updated on July 9, 2023. NPI Profile syncs weekly with the NPPES registry data releases published by CMS. This NPI record was last updated 3 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.
# Dr. Christiaan Anderson Rees, MD, PHD · NPI 1831726405
Critical Care Medicine physician in Aurora, Colorado. Individual provider, active in the CMS NPPES registry since March 24, 2020.
## Identity
- **NPI:** 1831726405 (Entity type: Individual)
- **Enumerated:** March 24, 2020
- **Primary specialty:** Internal Medicine - Critical Care Medicine · taxonomy 207RC0200X
- **State license:** DR.0071079 (Colorado)
- **Sole proprietor:** Yes
## Practice location
- **Address:** 13001 E 17TH PL, Aurora, CO 80045-2570
- **Phone:** (603) 276-8704
## 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:** 3 organizations under Medicare reassignment (form CMS-855R): Critical Care & Pulmonary Consultants, PC (NPI 1033135520, Greenwood Village, CO); Critical Care Pulmonary And Sleep Associates Professional LLP (NPI 1437100039, Lakewood, CO); Dhhs, Phs, Naihs, Shiprock Hospital (NPI 1760427587, Bloomfield, NM) · CMS Revalidation Reassignment List, October 2026 release
- **Medical school:** Other, class of 2018
## Record status
- **NPPES last updated:** July 9, 2023
---
Source: [NPI Profile](https://npiprofile.com/npi/1831726405) · Data from the CMS NPPES public registry.