Christiaan Rees, MD, PHD
NPI 1831726405 · Critical Care Medicine (Internal Medicine) Physician · Aurora, CO
Enrolled with Medicare as Practitioner - Critical Care (intensivists) · source: CMS PECOS Public Provider Enrollment (2026.04.01)
Christiaan Rees, MD, PHD is a Critical Care Medicine (Internal Medicine) Physician provider in Aurora, CO (NPI 1831726405).
Provider details
- NPI number
- 1831726405
- Entity type
- Individual
- Primary specialty
- Critical Care Medicine (Internal Medicine) PhysicianAllopathic & Osteopathic Physicians
- Credential
- MD, PHD
- Sex
- Male
- Sole proprietor
- Yes
- License
- DR.0071079 (CO)
Specialties & taxonomies
Allopathic & Osteopathic Physicians
Allopathic & Osteopathic Physicians
Allopathic & Osteopathic Physicians
Student, Health Care
Profile Score
A profile completeness & documented-activity index — NOT a quality, outcomes, or patient-satisfaction rating.
- Registry tenure28% of score
6 yrs in NPPES registry
- Profile completeness28% of score
100% of core fields populated
- Practice footprint17% of score
6 documented practice locations
- Medicare service volume (vs. specialty peers)28% of score
32 Medicare services, 2024 (ranked within specialty)
Medicare volume is ranked against active providers in the same specialty. Signals a provider has no public data for (e.g. Medicare claims) are left out of the score entirely — never counted as zero — so providers without that data are not penalized. See the full formula and weights in our methodology.
What this provider does (Medicare)
Based on Medicare fee-for-service claims, 2024; not all care is captured.
| Service (HCPCS) | Medicare services | Typical Medicare-allowed (2024) |
|---|---|---|
| Critical Care, First 30-74 Minutes99291 | 18 | $208 |
| Initial Hospital Care With Moderate Level of Medical Decision Making, If Using Time, at Least 75 Minutes99223 | 14 | $170 |
Typical Medicare-allowed amounts for these services range $170–$208 (2024). The Medicare-allowed amount is what Medicare recognizes for a service under fee-for-service — a reference figure for 2024, not a price quote and not what you would be billed. Medicare Part B covers roughly an eighth of all NPIs (65+ skew); services with fewer than 11 beneficiaries are suppressed by CMS. Source: CMS Medicare Physician & Other Practitioners, by Provider & Service.
Practice location
Mailing address
Additional practice locations (5)
- 1700 Wheeling StAurora, CO 80045-7211Phone: (603) 276-8704
- 777 Bannock StDenver, CO 80204-4597Phone: (603) 276-8704
- 1400 Jackson StDenver, CO 80206-2762Phone: (603) 276-8704
- 1375 E 19th AveDenver, CO 80218-1114Phone: (603) 276-8704
- 11600 W 2nd PlLakewood, CO 80228-1527Phone: (603) 276-8704
Registry dates
- Enumerated
- 2020-03-24
- Last updated
- 2023-07-09
- Certified
- 2023-07-09
Frequently asked questions
- What is Christiaan Rees's NPI number?
- Christiaan Rees's National Provider Identifier (NPI) is 1831726405, a unique 10-digit ID issued by CMS for use in standard healthcare transactions.
- What is Christiaan Rees's specialty?
- Christiaan Rees is listed in the NPPES registry with a primary specialty of Critical Care Medicine (Internal Medicine) Physician (Allopathic & Osteopathic Physicians).
- Where is Christiaan Rees located?
- Christiaan Rees's practice location on file with NPPES is 13001 E 17th Pl, Aurora, CO 80045-2570.
- What is Christiaan Rees's phone number?
- The practice phone number listed in the NPPES registry for Christiaan Rees is (603) 276-8704.
- Does Christiaan Rees accept Medicare?
- Christiaan Rees is approved to bill Medicare according to CMS PECOS enrollment data (2026.04.01). Confirm current participation with the provider before scheduling.
- Is Christiaan Rees's NPI active?
- Yes — Christiaan Rees's NPI (1831726405) is active in the NPPES registry as of the last update on 2023-07-09.
Source: CMS NPPES Data Dissemination (June 2026). NPI Central is not affiliated with CMS. Data is provided as-is from the public registry.