Justin Adam Horwitz, D.O.
Gastroenterology Physician · Chandler, AZ
Justin Adam Horwitz, D.O. is a gastroenterology physician with a practice address in Chandler, Arizona, and NPI 1528201670, issued on Apr 18, 2009. Check the license (Arizona 008589, as entered in NPPES) on the Arizona Medical Board; the Medicare figures below come from public CMS files.
- Name
- Justin Adam Horwitz
- Credential
- D.O.
- Primary taxonomy
- Gastroenterology Physician 207RG0100X
- License numbers
- 008589 AZ
02005343A IN
TL39099 SC
Self-reported in NPPES; status is on the state search - Practice location
- 1125 S Alma School RD Ste 210, Chandler, AZ 85286
- Phone
- (480) 256-4900
- Enumerated
- Apr 18, 2009
- Record last updated
- Nov 13, 2021 (not updated in 5 years: call before relying on the address or phone)
- Medicare enrollment
- Enrolled (PECOS I20200918001906); accepts Medicare assignment
- Medical or professional school
- Lake Erie College Of Osteopathic Medicine, Erie, 2009
- Telehealth
- Offers telehealth (CMS)
- Entity
- Type 1 · individual
Also registered at 1125 S Alma School RD Ste 210
A shared address usually means a shared clinic or building; it does not show who employs whom.
- Vanessa Lara, FNP-CFamily Nurse Practitioner1861033912
- Garrett Oligschlaeger, PA-CPhysician Assistant1700698438
- Donna Rivera, APN, CNMAdvanced Practice Midwife1881020402
- Sean Sitton, M.D.Sports Medicine (Orthopaedic Surgery) Physician1922410166
- Zachary Sitton, MDSports Medicine (Family Medicine) Physician1528645249
Verify Justin Adam Horwitz in five checks
- 1IdentityNPI record in CMS NPPESNPI lookupConfirmed in NPPES
- 2LicenseActive license and public ordersArizona Medical Board
Search for license 008589Check the board - 3Other statesLicenses and actions elsewhereDocInfo (FSMB)Not checked
- 4ExclusionsMedicare and Medicaid bansHHS-OIG exclusion listNot checked
- 5CertificationBoard certificationABMS AOA NCCPA AANPNot checked
11% more Medicare Part D claims than the average gastroenterology physician in 2024
903 Medicare Part D claims for 331 beneficiaries, against an average of 811 among the 16,445 providers of this specialty who prescribed in Part D. Brand-name drugs were 21% of claims.
Most prescribed
- Famotidine160 claims
- Pantoprazole Sodium154 claims
- Gavilyte-G83 claims
- Omeprazole80 claims
- Peg-3350 And Electrolytes41 claims
- Linzess38 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): 87.8 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).
Industry payments in 2024: $143.10
1 payment: food and beverage; the largest payer was Ipsen Biopharmaceuticals, 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
- Banner Physician Specialists Arizona LLCChandler, AZ
Source: CMS Doctors and Clinicians National Downloadable File (the group practices a clinician bills Medicare through) (data.cms.gov).
Gastroenterology Physician providers in Arizona
There are 403 gastroenterology physician records in Arizona.
Other gastroenterology physician records in Arizona
- Neena Abraham, MDScottsdale, AZ1801806930
- Shahab Aftahi, M.D.Phoenix, AZ1881656783
- Avin Aggarwal, M.D.Tucson, AZ1467716555
- Sanjay Ahluwalia, M.D.Chandler, AZ1104807882
- Akram Ahmad, MBBSScottsdale, AZ1588292304
- Shifat Ahmed, MDPhoenix, AZ1568881472
- Layth Al-Jashaami, M.DPhoenix, AZ1255691895
- Bassel Al-Lahham, MDPhoenix, AZ1619081577
- Shayan Alam, M.D.Prescott, AZ1780654988
- Aws Alameri, MDPhoenix, AZ1114423381
Common questions
What is Justin Adam Horwitz, D.O.'s NPI number?
Justin Adam Horwitz, D.O.'s National Provider Identifier (NPI) is 1528201670, issued on Apr 18, 2009. An NPI identifies a provider in billing; it is not a license.
Where is Justin Adam Horwitz, D.O. located?
The NPPES record lists a practice address at 1125 S Alma School RD Ste 210, Chandler, AZ, 85286. Phone: (480) 256-4900. Providers update this record themselves, so call before visiting.
How can I verify Justin Adam Horwitz, D.O.'s license?
NPPES lists Arizona license number 008589, 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 Justin Adam Horwitz, D.O. prescribe under Medicare Part D?
In 2024, Justin Adam Horwitz, D.O. had 903 Medicare Part D claims for 331 beneficiaries; the average among gastroenterology physician prescribers was 811. Part D covers Medicare prescriptions only.
What is Justin Adam Horwitz, D.O.'s MIPS final score?
The 2023 MIPS final score is 87.8 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.