Steven T. Zierer, M.D.
Gastroenterology Physician · Mesa, AZ
Steven T. Zierer, M.D. is a gastroenterology physician with a practice address in Mesa, Arizona, and NPI 1366437337, issued on Sep 15, 2005. Check the license (Arizona 20445, as entered in NPPES) on the Arizona Medical Board; the Medicare figures below come from public CMS files.
- Name
- Steven T. Zierer
- Credential
- M.D.
- Primary taxonomy
- Gastroenterology Physician 207RG0100X
- License numbers
- 20445 AZ
141413 MT
Self-reported in NPPES; status is on the state search - Practice location
- 6020 E Arbor Ave, Mesa, AZ 85206
- Phone
- (480) 985-1700
- Enumerated
- Sep 15, 2005
- Record last updated
- Apr 28, 2025
- Fax
- (480) 396-3659
- Medicare enrollment
- Enrolled (PECOS I20240624003621); accepts Medicare assignment
- Medical or professional school
- Indiana University School Of Medicine, 1989
- Entity
- Type 1 · individual
8 nearest gastroenterology physician records → All 403 in Arizona → Look up another NPI →
Also registered at 6020 E Arbor Ave
A shared address usually means a shared clinic or building; it does not show who employs whom.
- Shauna Binette, A.N.P.Adult Health Nurse Practitioner1427043496
- Danielle Carrillo, FNPFamily Nurse Practitioner1366992802
- Doo-Sang Cho, M.D.Gastroenterology Physician1750376778
- Craig Stein, M.D.Gastroenterology Physician1861487456
- George Walker, M.D.Gastroenterology Physician1528053121
Verify Steven T. Zierer in five checks
- 1IdentityNPI record in CMS NPPESNPI lookupConfirmed in NPPES
- 2LicenseActive license and public ordersArizona Medical Board
Search for license 20445Check the board - 3Other statesLicenses and actions elsewhereDocInfo (FSMB)Not checked
- 4ExclusionsMedicare and Medicaid bansHHS-OIG exclusion listNot checked
- 5CertificationBoard certificationABMS AOA NCCPA AANPNot checked
41% fewer Medicare Part D claims than the average gastroenterology physician in 2024
482 Medicare Part D claims for 191 beneficiaries, against an average of 811 among the 16,445 providers of this specialty who prescribed in Part D. Brand-name drugs were 11% of claims.
Most prescribed
- Pantoprazole Sodium228 claims
- Famotidine44 claims
- Omeprazole30 claims
- Esomeprazole Magnesium19 claims
- Colestipol Hcl14 claims
- Budesonide Dr12 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.
No measured MIPS final score for 2023
CMS assigned the neutral MIPS final score of 75 without scoring Quality, Cost, Promoting Interoperability or Improvement Activities. It is an administrative threshold, so PlainDoctor does not compare it with measured clinicians.
Source: CMS Quality Payment Program, MIPS performance year 2023, group reporting; category weights for 2023 (qpp.cms.gov).
Industry payments in 2024: $370.55
19 payments; by number, the most common kind was food and beverage; the largest payer was Ferring Pharmaceuticals Inc. The 13,350 providers of this specialty with any payment received $5,015.95 on average. Payments are reported by manufacturers, not by the provider, and are not a sign of wrongdoing.
Source: CMS Open Payments, program year 2024 (openpaymentsdata.cms.gov); average among providers of this specialty with at least one payment.
Bills Medicare through one group practice
- Kalispell Regional Medical Center IncKalispell, MT
Source: CMS Doctors and Clinicians National Downloadable File (the group practices a clinician bills Medicare through) (data.cms.gov).
Steven T. Zierer among 403 gastroenterology physician records in Arizona
Steven T. Zierer, M.D. is one of 403 gastroenterology physician records with a practice address in Arizona. 84% of them appear in a Medicare file (Part D prescribing, MIPS, Open Payments or Medicare group billing); this one does. Its NPI, issued in 2005, is newer than 0% of them.
- NPI issued2005 · 0% of these records are older, 83% newer
- In a Medicare fileYes · 84% of these records are
- In the CMS Doctors and Clinicians fileYes · 73% of these records are
- Graduated1989 · median 2001 among the 295 with a school on file
- Record last updated2025 · 47% of these records were not updated in five years or more
Source: CMS NPPES, file of Aug 9, 2026, every record with primary taxonomy 207RG0100X and a Arizona practice address; Medicare files: CMS Part D Prescribers 2024, MIPS 2023, Open Payments 2024, Doctors and Clinicians (data.cms.gov).
Gastroenterology Physician providers in Arizona
There are 403 gastroenterology physician records in Arizona.
All 403 in Arizona → Every provider in Mesa → Gastroenterology Physician nationwide →
The 8 gastroenterology physician records with the nearest ZIP codes
- Doo-Sang Cho, M.D.Mesa, AZ 852061750376778
- Andrew Collins, M.D.Mesa, AZ 852061740275338
- Steven Kaiser, MDMesa, AZ 852061346219433
- Prem Kumar, MDMesa, AZ 852061700841350
- David Leff, DOMesa, AZ 852061619956505
- Shahbaz Qureshi, MDMesa, AZ 852061548370109
- Sudhakar Reddy, MDMesa, AZ 852061063458735
- Michael Seip, DOMesa, AZ 852061205815925
Common questions
What is Steven T. Zierer, M.D.'s NPI number?
Steven T. Zierer, M.D.'s National Provider Identifier (NPI) is 1366437337, issued on Sep 15, 2005. An NPI identifies a provider in billing; it is not a license.
Where is Steven T. Zierer, M.D. located?
The NPPES record lists a practice address at 6020 E Arbor Ave, Mesa, AZ, 85206. Phone: (480) 985-1700. Providers update this record themselves, so call before visiting.
How can I verify Steven T. Zierer, M.D.'s license?
NPPES lists Arizona license number 20445, as entered by the provider. Search the Arizona Medical Board at https://www.azmd.gov/. The NPPES record confirms identity only; the state search shows license status, expiration and public orders.
How much does Steven T. Zierer, M.D. prescribe under Medicare Part D?
In 2024, Steven T. Zierer, M.D. had 482 Medicare Part D claims for 191 beneficiaries; the average among gastroenterology physician prescribers was 811. Part D covers Medicare prescriptions only.
What is Steven T. Zierer, M.D.'s MIPS final score?
CMS assigned the neutral MIPS final score of 75 for 2023 without scoring any category, so it is not a measured result.
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.