Gregory Michael Cowan, M.D.
Allergy & Immunology Physician · Peoria, AZ
Gregory Michael Cowan, M.D. is an allergy & immunology physician with a practice address in Peoria, Arizona, and NPI 1164756904, issued on Sep 27, 2009. Check the license (Arizona 48556, as entered in NPPES) on the Arizona Medical Board; the Medicare figures below come from public CMS files.
- Name
- Gregory Michael Cowan
- Credential
- M.D.
- Primary taxonomy
- Allergy & Immunology Physician 207K00000X
- License numbers
- 48556 AZ
ME110800 FL
Self-reported in NPPES; status is on the state search - Practice location
- 9145 W Thunderbird RD Ste 101, Peoria, AZ 85381
- Phone
- (623) 815-7800
- Enumerated
- Sep 27, 2009
- Record last updated
- Oct 26, 2021 (not updated in 5 years: call before relying on the address or phone)
- Fax
- (623) 815-7900
- Medicaid IDs
- 003990800 FL
935585 AZ - Medicare enrollment
- Enrolled (PECOS I20141014000952); accepts Medicare assignment
- Medical or professional school
- University Of South Florida College Of Medicine, 2008
- Telehealth
- Offers telehealth (CMS)
- Entity
- Type 1 · individual
8 nearest allergy & immunology physician records → All 88 in Arizona → Look up another NPI →
Verify Gregory Michael Cowan in five checks
- 1IdentityNPI record in CMS NPPESNPI lookupConfirmed in NPPES
- 2LicenseActive license and public ordersArizona Medical Board
Search for license 48556Check the board - 3Other statesLicenses and actions elsewhereDocInfo (FSMB)Not checked
- 4ExclusionsMedicare and Medicaid bansHHS-OIG exclusion listNot checked
- 5CertificationBoard certificationABMS AOA NCCPA AANPNot checked
6% fewer Medicare Part D claims than the average allergy & immunology physician in 2024
695 Medicare Part D claims for 122 beneficiaries, against an average of 741 among the 2,899 providers of this specialty who prescribed in Part D. Brand-name drugs were 32% of claims.
Most prescribed
- Ipratropium Bromide57 claims
- Levocetirizine Dihydrochloride48 claims
- Trelegy Ellipta43 claims
- Albuterol Sulfate Hfa39 claims
- Prednisone39 claims
- Montelukast Sodium35 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.
Industry payments in 2024: $399.96
27 payments; by number, the most common kind was food and beverage; the largest payer was Takeda Pharmaceuticals U.S.A., Inc. The 2,496 providers of this specialty with any payment received $8,321.81 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
- Livwell Health LLCGoodyear, AZ
Source: CMS Doctors and Clinicians National Downloadable File (the group practices a clinician bills Medicare through) (data.cms.gov).
Gregory Michael Cowan among 88 allergy & immunology physician records in Arizona
Gregory Michael Cowan, M.D. is one of 88 allergy & immunology physician records with a practice address in Arizona. 80% of them appear in a Medicare file (Part D prescribing, MIPS, Open Payments or Medicare group billing); this one does. Its NPI, issued in 2009, is newer than 69% of them.
- NPI issued2009 · 69% of these records are older, 28% newer
- In a Medicare fileYes · 80% of these records are
- In the CMS Doctors and Clinicians fileYes · 65% of these records are
- Graduated2008 · median 2001 among the 57 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 207K00000X and a Arizona practice address; Medicare files: CMS Part D Prescribers 2024, MIPS 2023, Open Payments 2024, Doctors and Clinicians (data.cms.gov).
Allergy & Immunology Physician providers in Arizona
There are 88 allergy & immunology physician records in Arizona.
All 88 in Arizona → Every provider in Peoria → Allergy & Immunology Physician nationwide →
The 8 allergy & immunology physician records with the nearest ZIP codes
- Kevin Boesel, MDPeoria, AZ 853811154312858
- Ryan Casper, MDPeoria, AZ 853811306898846
- Eiza Ching, MDPeoria, AZ 853811740236298
- Levente Erdos, MDPeoria, AZ 853811659473197
- Ronald Jorgensen, MDPeoria, AZ 853811760473466
- Ronald Mittel, M.D.Peoria, AZ 853811407016348
- Christine Pratt, PAPeoria, AZ 853811033201074
- Mark Rose, MDPeoria, AZ 853811851382550
Common questions
What is Gregory Michael Cowan, M.D.'s NPI number?
Gregory Michael Cowan, M.D.'s National Provider Identifier (NPI) is 1164756904, issued on Sep 27, 2009. An NPI identifies a provider in billing; it is not a license.
Where is Gregory Michael Cowan, M.D. located?
The NPPES record lists a practice address at 9145 W Thunderbird RD Ste 101, Peoria, AZ, 85381. Phone: (623) 815-7800. Providers update this record themselves, so call before visiting.
How can I verify Gregory Michael Cowan, M.D.'s license?
NPPES lists Arizona license number 48556, 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 Gregory Michael Cowan, M.D. prescribe under Medicare Part D?
In 2024, Gregory Michael Cowan, M.D. had 695 Medicare Part D claims for 122 beneficiaries; the average among allergy & immunology physician prescribers was 741. 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.