Joann L. Zell, M.D.
Rheumatology Physician · Denver, CO
Joann L. Zell, M.D. is a rheumatology physician with a practice address in Denver, Colorado, and NPI 1760415418, issued on Jul 8, 2006. Check the license (Colorado 45196, as entered in NPPES) on the Colorado Medical Board; the Medicare figures below come from public CMS files.
- Name
- Joann L. Zell
- Credential
- M.D.
- Primary taxonomy
- Rheumatology Physician 207RR0500X
- License number
- 45196 CO
Self-reported in NPPES; status is on the state search - Practice location
- 1400 Jackson St, Denver, CO 80206
- Phone
- (303) 388-4461
- Enumerated
- Jul 8, 2006
- Record last updated
- Jul 21, 2022
- Fax
- (303) 270-2174
- Medicaid ID
- 57775834 CO
- Medicare enrollment
- Enrolled (PECOS I20070214000391); accepts Medicare assignment
- Medical or professional school
- Northwestern University Feinberg Medical School, 1999
- Telehealth
- Offers telehealth (CMS)
- Entity
- Type 1 · individual
8 nearest rheumatology physician records → All 145 in Colorado → Look up another NPI →
Also registered at 1400 Jackson St
A shared address usually means a shared clinic or building; it does not show who employs whom.
- Ronya Ajeel, APN-CRNACertified Registered Nurse Anesthetist1184279044
- Akrum Al-Zubaidi, D.O.Pulmonary Disease Physician1649426222
- Rafeul Alam, MDAllergy & Immunology Physician1790730687
- Jon Allison, PACMedical Physician Assistant1609812668
- Vivianne Allsop, MDRheumatology Physician1215499603
- Mark Aloia, MDPsychiatry Physician1295842607
Verify Joann L. Zell in five checks
- 1IdentityNPI record in CMS NPPESNPI lookupConfirmed in NPPES
- 2LicenseActive license and public ordersColorado Medical Board
Search for license 45196Check the board - 3Other statesLicenses and actions elsewhereDocInfo (FSMB)Not checked
- 4ExclusionsMedicare and Medicaid bansHHS-OIG exclusion listNot checked
- 5CertificationBoard certificationABMS AOA NCCPA AANPNot checked
72% fewer Medicare Part D claims than the average rheumatology physician in 2024
555 Medicare Part D claims for 94 beneficiaries, against an average of 1,978 among the 6,301 providers of this specialty who prescribed in Part D. Brand-name drugs were 28% of claims. 13 claims were for opioids.
Most prescribed
- Hydroxychloroquine Sulfate97 claims
- Benlysta47 claims
- Methotrexate37 claims
- Pregabalin32 claims
- Mycophenolate Mofetil24 claims
- Azathioprine21 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 MIPS final score for 2023 (Medicare payment program): 97.6 of 100
The Merit-based Incentive Payment System score is reported for this clinician. 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; category weights for 2023 (qpp.cms.gov).
Bills Medicare through one group practice
- University Physicians IncorporatedAurora, CO
Source: CMS Doctors and Clinicians National Downloadable File (the group practices a clinician bills Medicare through) (data.cms.gov).
Joann L. Zell among 145 rheumatology physician records in Colorado
Joann L. Zell, M.D. 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 2006, is newer than 8% of them.
- NPI issued2006 · 8% of these records are older, 59% newer
- In a Medicare fileYes · 81% of these records are
- In the CMS Doctors and Clinicians fileYes · 70% of these records are
- Graduated1999 · median 2004 among the 102 with a school on file
- Record last updated2022 · 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
- Vivianne Allsop, MDDenver, CO 802061215499603
- Bjorn Anderson, MDDenver, CO 802061922521442
- Marc Cohen, M.D.Denver, CO 802061053301739
- Aryeh Fischer, M.D.Denver, CO 802061669436259
- Rebecca Gordon, M.D.Denver, CO 802061316168834
- Ivana IlicDenver, CO 802061285194555
- Stuart Kassan, MDDenver, CO 802061093706475
- Liudmila Kastsianok, M.D.Denver, CO 802061659638492
Common questions
What is Joann L. Zell, M.D.'s NPI number?
Joann L. Zell, M.D.'s National Provider Identifier (NPI) is 1760415418, issued on Jul 8, 2006. An NPI identifies a provider in billing; it is not a license.
Where is Joann L. Zell, M.D. located?
The NPPES record lists a practice address at 1400 Jackson St, Denver, CO, 80206. Phone: (303) 388-4461. Providers update this record themselves, so call before visiting.
How can I verify Joann L. Zell, M.D.'s license?
NPPES lists Colorado license number 45196, 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 Joann L. Zell, M.D. prescribe under Medicare Part D?
In 2024, Joann L. Zell, M.D. had 555 Medicare Part D claims for 94 beneficiaries; the average among rheumatology physician prescribers was 1,978. Part D covers Medicare prescriptions only.
What is Joann L. Zell, M.D.'s MIPS final score?
The 2023 MIPS final score is 97.6 of 100. 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.