Christopher Zirker, MD, MSC
NPI 1629565890 · Internal Medicine Physician · Loveland, CO
Enrolled with Medicare as Practitioner - Internal Medicine · source: CMS PECOS Public Provider Enrollment (2026.04.01)
Christopher Zirker, MD, MSC is a Internal Medicine Physician provider in Loveland, CO (NPI 1629565890).
Provider details
- NPI number
- 1629565890
- Entity type
- Individual
- Primary specialty
- Internal Medicine PhysicianAllopathic & Osteopathic Physicians
- Credential
- MD, MSC
- Sex
- Male
- Sole proprietor
- No
Specialties & taxonomies
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
8 yrs in NPPES registry
- Profile completeness28% of score
83% of core fields populated
- Practice footprint17% of score
4 documented practice locations
- Medicare service volume (vs. specialty peers)28% of score
219 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) |
|---|---|---|
| Initial Hospital Care With Moderate Level of Medical Decision Making, If Using Time, at Least 75 Minutes99223 | 188 | $171 |
| Critical Care, First 30-74 Minutes99291 | 31 | $209 |
Typical Medicare-allowed amounts for these services range $171–$209 (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 (3)
- 13001 E 17th PlAurora, CO 80045-2570Phone: (303) 724-1792
- 1024 S Lemay AveFort Collins, CO 80524-3929Phone: (970) 495-7000
- 6767 29th StGreeley, CO 80634-5474Phone: (970) 652-2000
Registry dates
- Enumerated
- 2018-04-13
- Last updated
- 2021-06-24
- Certified
- 2021-06-24
Frequently asked questions
- What is Christopher Zirker's NPI number?
- Christopher Zirker's National Provider Identifier (NPI) is 1629565890, a unique 10-digit ID issued by CMS for use in standard healthcare transactions.
- What is Christopher Zirker's specialty?
- Christopher Zirker is listed in the NPPES registry with a primary specialty of Internal Medicine Physician (Allopathic & Osteopathic Physicians).
- Where is Christopher Zirker located?
- Christopher Zirker's practice location on file with NPPES is 2500 Rocky Mountain Ave, Loveland, CO 80538-9004.
- What is Christopher Zirker's phone number?
- The practice phone number listed in the NPPES registry for Christopher Zirker is (970) 624-2500.
- Does Christopher Zirker accept Medicare?
- Christopher Zirker is approved to bill Medicare according to CMS PECOS enrollment data (2026.04.01). Confirm current participation with the provider before scheduling.
- Is Christopher Zirker's NPI active?
- Yes — Christopher Zirker's NPI (1629565890) is active in the NPPES registry as of the last update on 2021-06-24.
Source: CMS NPPES Data Dissemination (June 2026). NPI Central is not affiliated with CMS. Data is provided as-is from the public registry.