Christopher Anzalone Zirker, MD, MSC
Internal Medicine Physician · Loveland, CO
Christopher Anzalone Zirker, MD, MSC is an internal medicine physician with a practice address in Loveland, Colorado, and NPI 1629565890, issued on Apr 13, 2018. Check the license (Colorado DR.0066504, as entered in NPPES) on the Colorado Medical Board; the Medicare figures below come from public CMS files.
- Name
- Christopher Anzalone Zirker
- Credential
- MD, MSC
- Primary taxonomy
- Internal Medicine Physician 207R00000X
- License number
- DR.0066504 CO
Self-reported in NPPES; status is on the state search - Practice location
- 2500 Rocky Mountain Ave, Loveland, CO 80538
- Phone
- (970) 624-2500
- Enumerated
- Apr 13, 2018
- Record last updated
- Jun 24, 2021 (not updated in 5 years: call before relying on the address or phone)
- Medicare enrollment
- Enrolled (PECOS I20210722003678); accepts Medicare assignment
- Medical or professional school
- Yale University School Of Medicine, 2018
- Entity
- Type 1 · individual
8 nearest internal medicine physician records → All 2,046 in Colorado → Look up another NPI →
Also registered at 2500 Rocky Mountain Ave
A shared address usually means a shared clinic or building; it does not show who employs whom.
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Verify Christopher Anzalone Zirker in five checks
- 1IdentityNPI record in CMS NPPESNPI lookupConfirmed in NPPES
- 2LicenseActive license and public ordersColorado Medical Board
Search for license DR.0066504Check the board - 3Other statesLicenses and actions elsewhereDocInfo (FSMB)Not checked
- 4ExclusionsMedicare and Medicaid bansHHS-OIG exclusion listNot checked
- 5CertificationBoard certificationABMS AOA NCCPA AANPNot checked
The practice group's MIPS final score for 2023 (Medicare payment program): 89.3 of 100
The Merit-based Incentive Payment System score is reported for the practice group, not for one clinician alone. Four categories are weighted into the final score; the average among 454,083 clinicians with a measured score was 83.5.
Source: CMS Quality Payment Program, MIPS performance year 2023, group reporting; category weights for 2023 (qpp.cms.gov).
Bills Medicare through one group practice
- Northern Colorado Hospitalists Professional LLCFort Collins, CO
Source: CMS Doctors and Clinicians National Downloadable File (the group practices a clinician bills Medicare through) (data.cms.gov).
Christopher Anzalone Zirker among 2,046 internal medicine physician records in Colorado
Christopher Anzalone Zirker, MD, MSC is one of 2,046 internal medicine physician records with a practice address in Colorado. 71% of them appear in a Medicare file (Part D prescribing, MIPS, Open Payments or Medicare group billing); this one does. Its NPI, issued in 2018, is newer than 87% of them.
- NPI issued2018 · 87% of these records are older, 11% newer
- In a Medicare fileYes · 71% of these records are
- In the CMS Doctors and Clinicians fileYes · 53% of these records are
- Graduated2018 · median 2006 among the 1,090 with a school on file
- Record last updated2021 · 61% of these records were not updated in five years or more
Source: CMS NPPES, file of Aug 9, 2026, every record with primary taxonomy 207R00000X and a Colorado practice address; Medicare files: CMS Part D Prescribers 2024, MIPS 2023, Open Payments 2024, Doctors and Clinicians (data.cms.gov).
28 internal medicine physician records list a practice address in Loveland
They are 28 of the 2,113 NPPES records with a practice address in Loveland, and 2,046 internal medicine physician records in Colorado.
All 2,046 in Colorado → Every provider in Loveland → Internal Medicine Physician nationwide →
The 8 internal medicine physician records with the nearest ZIP codes
- Grace Alessi, MDLoveland, CO 805381457381964
- Nathan Ayer, M.D., M.P.H.Loveland, CO 805381457361172
- Sheila Copple, D.O.Loveland, CO 805381255384087
- Julia Cuervo, M.D.Loveland, CO 805381275500787
- Sarvin Emami, MDLoveland, CO 805381154304376
- Bertrand Honea, M.D.Loveland, CO 805381194742981
- Kevin Keefe, DOLoveland, CO 805381689663684
- William Lopez, M.D.Loveland, CO 805381023015807
Common questions
What is Christopher Anzalone Zirker, MD, MSC's NPI number?
Christopher Anzalone Zirker, MD, MSC's National Provider Identifier (NPI) is 1629565890, issued on Apr 13, 2018. An NPI identifies a provider in billing; it is not a license.
Where is Christopher Anzalone Zirker, MD, MSC located?
The NPPES record lists a practice address at 2500 Rocky Mountain Ave, Loveland, CO, 80538. Phone: (970) 624-2500. Providers update this record themselves, so call before visiting.
How can I verify Christopher Anzalone Zirker, MD, MSC's license?
NPPES lists Colorado license number DR.0066504, as entered by the provider. Search the Colorado Medical Board at https://dpo.colorado.gov/Medical. The NPPES record confirms identity only; the state search shows license status, expiration and public orders.
What is Christopher Anzalone Zirker, MD, MSC's MIPS final score?
The 2023 MIPS final score is 89.3 of 100, reported for the practice group. The average among 454,083 clinicians with a measured score was 83.5.
Source: CMS National Plan and Provider Enumeration System (NPPES), file of Aug 9, 2026 (NPPES files on CMS.gov); NUCC Health Care Provider Taxonomy. Medicare files from data.cms.gov. An NPI identifies who bills; it is not a license.
Figures on PlainDoctor are read from the federal files each page names (CMS NPPES, Medicare Part D, MIPS, Open Payments; the HHS-OIG exclusion list only as counts) and from Census population estimates, with the file date shown beside them. See our editorial standards & corrections policy, the methodology behind these numbers, or report a data error. Data current as of Aug 9, 2026.