Derek Stewart, M.D.
Emergency Medicine Physician · Phoenix, AZ
Derek Stewart, M.D. is an emergency medicine physician with a practice address in Phoenix, Arizona, and NPI 1821309519, issued on Jun 28, 2010. Check the license (Arizona 45723, as entered in NPPES) on the Arizona Medical Board; the Medicare figures below come from public CMS files.
- Name
- Derek Stewart
- Credential
- M.D.
- Primary taxonomy
- Emergency Medicine Physician 207P00000X
- License number
- 45723 AZ
Self-reported in NPPES; status is on the state search - Practice location
- 250 E Dunlap Ave, Phoenix, AZ 85020
- Phone
- (602) 870-6316
- Enumerated
- Jun 28, 2010
- Record last updated
- Dec 8, 2016 (not updated in 10 years: call before relying on the address or phone)
- Fax
- (602) 870-6091
- Entity
- Type 1 · individual
8 nearest emergency medicine physician records → All 1,494 in Arizona → Look up another NPI →
Also registered at 250 E Dunlap Ave
A shared address usually means a shared clinic or building; it does not show who employs whom.
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Verify Derek Stewart in five checks
- 1IdentityNPI record in CMS NPPESNPI lookupConfirmed in NPPES
- 2LicenseActive license and public ordersArizona Medical Board
Search for license 45723Check the board - 3Other statesLicenses and actions elsewhereDocInfo (FSMB)Not checked
- 4ExclusionsMedicare and Medicaid bansHHS-OIG exclusion listNot checked
- 5CertificationBoard certificationABMS AOA NCCPA AANPNot checked
70% more Medicare Part D claims than the average emergency medicine physician in 2024
384 Medicare Part D claims for 262 beneficiaries, against an average of 226 among the 54,106 providers of this specialty who prescribed in Part D. Brand-name drugs were 5% of claims. 88 claims were for opioids.
Most prescribed
- Ondansetron Odt47 claims
- Oxycodone-Acetaminophen42 claims
- Cephalexin36 claims
- Hydrocodone-Acetaminophen27 claims
- Cyclobenzaprine Hcl21 claims
- Prednisone13 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.
Derek Stewart among 1,494 emergency medicine physician records in Arizona
Derek Stewart, M.D. is one of 1,494 emergency medicine physician records with a practice address in Arizona. 79% of them appear in a Medicare file (Part D prescribing, MIPS, Open Payments or Medicare group billing); this one does. Its NPI, issued in 2010, is newer than 50% of them.
- NPI issued2010 · 50% of these records are older, 47% newer
- In a Medicare fileYes · 79% of these records are
- In the CMS Doctors and Clinicians fileNo · 55% of these records are
- Record last updated2016 · 55% of these records were not updated in five years or more
Source: CMS NPPES, file of Aug 9, 2026, every record with primary taxonomy 207P00000X and a Arizona practice address; Medicare files: CMS Part D Prescribers 2024, MIPS 2023, Open Payments 2024, Doctors and Clinicians (data.cms.gov).
394 emergency medicine physician records list a practice address in Phoenix
They are 394 of the 31,399 NPPES records with a practice address in Phoenix, and 1,494 emergency medicine physician records in Arizona.
All 1,494 in Arizona → Every provider in Phoenix → Emergency Medicine Physician nationwide →
The 8 emergency medicine physician records with the nearest ZIP codes
- Amy Axberg, M.D.Phoenix, AZ 850201508073925
- Derek Detemple, DOPhoenix, AZ 850201992788095
- Neal Faux, MDPhoenix, AZ 850201902832413
- Garth Gemar, M.D.Phoenix, AZ 850201295767457
- Charles Goldstein, MDPhoenix, AZ 850201386671089
- David Homer, DOPhoenix, AZ 850201225065436
- Caesar Ines, M.DPhoenix, AZ 850201407893027
- Jonathan Maitem, DOPhoenix, AZ 850201265456149
Common questions
What is Derek Stewart, M.D.'s NPI number?
Derek Stewart, M.D.'s National Provider Identifier (NPI) is 1821309519, issued on Jun 28, 2010. An NPI identifies a provider in billing; it is not a license.
Where is Derek Stewart, M.D. located?
The NPPES record lists a practice address at 250 E Dunlap Ave, Phoenix, AZ, 85020. Phone: (602) 870-6316. Providers update this record themselves, so call before visiting.
How can I verify Derek Stewart, M.D.'s license?
NPPES lists Arizona license number 45723, 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 Derek Stewart, M.D. prescribe under Medicare Part D?
In 2024, Derek Stewart, M.D. had 384 Medicare Part D claims for 262 beneficiaries; the average among emergency medicine physician prescribers was 226. Part D covers Medicare prescriptions only.
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.