Gregory Cowan, M.D.
NPI 1164756904 · Allergy & Immunology Physician · Peoria, AZ
Enrolled with Medicare as Practitioner - Allergy/Immunology · source: CMS PECOS Public Provider Enrollment (2026.04.01)
Gregory Cowan, M.D. is a Allergy & Immunology Physician provider in Peoria, AZ (NPI 1164756904).
Provider details
- NPI number
- 1164756904
- Entity type
- Individual
- Primary specialty
- Allergy & Immunology PhysicianAllopathic & Osteopathic Physicians
- Credential
- M.D.
- Sex
- Male
- Sole proprietor
- No
- License
- ME110800 (FL)
Specialties & taxonomies
Allopathic & Osteopathic Physicians
Allopathic & Osteopathic Physicians
Allopathic & Osteopathic Physicians
Allopathic & Osteopathic Physicians
Profile Score
A profile completeness & documented-activity index — NOT a quality, outcomes, or patient-satisfaction rating.
- Registry tenure25% of score
16 yrs in NPPES registry
- Profile completeness25% of score
100% of core fields populated
- Practice footprint15% of score
1 documented practice location
- Medicare service volume (vs. specialty peers)25% of score
8,710 Medicare services, 2024 (ranked within specialty)
- Open Payments transparency10% of score
Has Open Payments disclosures (2024)
Medicare volume is ranked against active providers in the same specialty. Signals a provider has no public data for (e.g. Medicare claims) are left out of the score entirely — never counted as zero — so providers without that data are not penalized. See the full formula and weights in our .
What this provider does (Medicare)
Based on Medicare fee-for-service claims, 2024; not all care is captured.
| Service (HCPCS) | Medicare services | Typical Medicare-allowed (2024) |
|---|---|---|
| Professional Service for Preparation and Provision of 1 Or More Antigens95165 | 4,110 | $14 |
| Injection of Drug Or Substance Under Skin Or Into Muscle96372 | 2,173 | $14 |
| Test for Allergy Using Allergenic Extract95004 | 1,264 | $3 |
| Professional Service for Multiple Injections of Allergen95117 | 618 | $12 |
| Administration of Non-Hormonal Anti-Neoplastic Chemotherapy Under Skin Or Into Muscle96401 | 251 | $68 |
| Established Patient Office Or Other Outpatient Visit With Low Level OD Decision Making, If Using Time, 20 Minutes Or More99213 | 136 | $86 |
What this provider prescribes (Medicare Part D)
Top drugs by Medicare Part D claim volume, 2024 · 21 distinct drugs on file.
| Drug | Part D claims (2024) | Beneficiaries |
|---|---|---|
| Ipratropium Bromide | 57 | 15 |
| Levocetirizine Dihydrochloride | 48 | 18 |
| Fluticasone/Umeclidin/Vilanterbrand: Trelegy Ellipta | 43 | — |
| Albuterol Sulfatebrand: Albuterol Sulfate Hfa | 39 | 18 |
| Prednisone | 39 | 17 |
| Montelukast Sodium | 35 | 11 |
| Cromolyn Sodium |
Transparency — industry payments
Based on CMS Open Payments, 2024; not all care is captured.
$400 across 27 records (Open Payments 2024)
Open Payments discloses payments and transfers of value (meals, travel, consulting, research, royalties) from drug and device makers to providers. This is a transparency signal, not a verdict — such payments are legal and common, and their presence is neither an endorsement nor a criticism. Source: CMS Open Payments, program year 2024.
Practice location
Mailing address
Registry dates
- Enumerated
- 2009-09-27
- Last updated
- 2021-10-26
- Certified
- 2021-10-26
Frequently asked questions
- What is Gregory Cowan's NPI number?
- Gregory Cowan's National Provider Identifier (NPI) is 1164756904, a unique 10-digit ID issued by CMS for use in standard healthcare transactions.
- What is Gregory Cowan's specialty?
- Gregory Cowan is listed in the NPPES registry with a primary specialty of Allergy & Immunology Physician (Allopathic & Osteopathic Physicians).
- Where is Gregory Cowan located?
- Gregory Cowan's practice location on file with NPPES is 9145 W Thunderbird Rd Ste 101, Peoria, AZ 85381-4820.
- What is Gregory Cowan's phone number?
- The practice phone number listed in the NPPES registry for Gregory Cowan is (623) 815-7800.
- Does Gregory Cowan accept Medicare?
- Gregory Cowan is approved to bill Medicare according to CMS PECOS enrollment data (2026.04.01). Confirm current participation with the provider before scheduling.
- Is Gregory Cowan's NPI active?
- Yes — Gregory Cowan's NPI (1164756904) is active in the NPPES registry as of the last update on 2021-10-26.
Source: CMS NPPES Data Dissemination (June 2026). NPI Central is not affiliated with CMS. Data is provided as-is from the public registry.