Itziar Quinzanos Alonso, MD
Rheumatology Physician · Denver, CO
Itziar Quinzanos Alonso, MD is a rheumatology physician with a practice address in Denver, Colorado, and NPI 1700932324, issued on Jan 26, 2007. Check the license (Colorado DR.0047171, as entered in NPPES) on the Colorado Medical Board; the Medicare figures below come from public CMS files.
- Name
- Itziar Quinzanos Alonso
- Credential
- MD
- Primary taxonomy
- Rheumatology Physician 207RR0500X
- License numbers
- DR.0047171 CO
47171 CO
Self-reported in NPPES; status is on the state search - Practice location
- 660 Bannock St, Denver, CO 80204
- Phone
- (303) 602-6170
- Enumerated
- Jan 26, 2007
- Record last updated
- Mar 9, 2021 (not updated in 5 years: call before relying on the address or phone)
- Medicare enrollment
- Enrolled (PECOS I20090804000054); accepts Medicare assignment
- Entity
- Type 1 · individual
8 nearest rheumatology physician records → All 145 in Colorado → Look up another NPI →
Also registered at 660 Bannock St
A shared address usually means a shared clinic or building; it does not show who employs whom.
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Verify Itziar Quinzanos Alonso in five checks
- 1IdentityNPI record in CMS NPPESNPI lookupConfirmed in NPPES
- 2LicenseActive license and public ordersColorado Medical Board
Search for license DR.0047171Check the board - 3Other statesLicenses and actions elsewhereDocInfo (FSMB)Not checked
- 4ExclusionsMedicare and Medicaid bansHHS-OIG exclusion listNot checked
- 5CertificationBoard certificationABMS AOA NCCPA AANPNot checked
81% fewer Medicare Part D claims than the average rheumatology physician in 2024
373 Medicare Part D claims for 83 beneficiaries, against an average of 1,978 among the 6,301 providers of this specialty who prescribed in Part D.
Most prescribed
- Methotrexate57 claims
- Humira Pen32 claims
- Prednisone31 claims
- Hydroxychloroquine Sulfate28 claims
- Alendronate Sodium26 claims
- Allopurinol16 claims
Source: CMS Medicare Part D Prescribers by Provider and Drug, 2024 (data.cms.gov). Part D covers prescriptions for Medicare patients only; drugs with fewer than 11 claims are not published.
The practice group's MIPS final score for 2023 (Medicare payment program): 91.1 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
- Denver Health And Hospital AuthorityDenver, CO
Source: CMS Doctors and Clinicians National Downloadable File (the group practices a clinician bills Medicare through) (data.cms.gov).
Itziar Quinzanos Alonso among 145 rheumatology physician records in Colorado
Itziar Quinzanos Alonso, MD is one of 145 rheumatology physician records with a practice address in Colorado. 81% of them appear in a Medicare file (Part D prescribing, MIPS, Open Payments or Medicare group billing); this one does. Its NPI, issued in 2007, is newer than 41% of them.
- NPI issued2007 · 41% of these records are older, 39% newer
- In a Medicare fileYes · 81% of these records are
- In the CMS Doctors and Clinicians fileYes · 70% of these records are
- Graduated2003 · median 2004 among the 102 with a school on file
- Record last updated2021 · 51% of these records were not updated in five years or more
Source: CMS NPPES, file of Aug 9, 2026, every record with primary taxonomy 207RR0500X and a Colorado practice address; Medicare files: CMS Part D Prescribers 2024, MIPS 2023, Open Payments 2024, Doctors and Clinicians (data.cms.gov).
Rheumatology Physician providers in Colorado
There are 145 rheumatology physician records in Colorado.
All 145 in Colorado → Every provider in Denver → Rheumatology Physician nationwide →
The 8 rheumatology physician records with the nearest ZIP codes
- Dennis Boyle, MDDenver, CO 802041326050493
- Lisa Davis, MDDenver, CO 802041700923083
- Joel Hirsh, MDDenver, CO 802041700800398
- Nicholas Kortan, D.O.Denver, CO 802041407052483
- Amarjyot RandhawaDenver, CO 802041538780382
- Alan Rosenberg, M.D.Denver, CO 802041639145923
- George Breth, M.D.Denver, CO 802051831233543
- Linda Eisenbraun, RNDenver, CO 802051790812733
Common questions
What is Itziar Quinzanos Alonso, MD's NPI number?
Itziar Quinzanos Alonso, MD's National Provider Identifier (NPI) is 1700932324, issued on Jan 26, 2007. An NPI identifies a provider in billing; it is not a license.
Where is Itziar Quinzanos Alonso, MD located?
The NPPES record lists a practice address at 660 Bannock St, Denver, CO, 80204. Phone: (303) 602-6170. Providers update this record themselves, so call before visiting.
How can I verify Itziar Quinzanos Alonso, MD's license?
NPPES lists Colorado license number DR.0047171, 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.
How much does Itziar Quinzanos Alonso, MD prescribe under Medicare Part D?
In 2024, Itziar Quinzanos Alonso, MD had 373 Medicare Part D claims for 83 beneficiaries; the average among rheumatology physician prescribers was 1,978. Part D covers Medicare prescriptions only.
What is Itziar Quinzanos Alonso, MD's MIPS final score?
The 2023 MIPS final score is 91.1 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.