NPI Lookup · Medicare billing profile

Gregory Cowan, M.D.

Allergy & Immunology Physician · Peoria, AZ · NPI 1164756904. Below: what a registry shows, plus the 2024 Medicare billing context no registry clone carries.

$5.3M
Est. Medicare paid, 2024
479,780
Services billed, 2024
15
Distinct codes billed, 2024
2024
Latest CMS data year

Registry record (NPPES)

NPI1164756904
TypeIndividual clinician
SpecialtyAllergy & Immunology Physician
Practice address9145 W Thunderbird Rd Ste 101
City / State / ZIPPeoria, AZ 85381

Top billed codes (2024)

J1306Injection, inclisiran, 1 mg420,300 · $4.0M
J3111Injection, romosozumab-aqqg, 1 mg16,800 · $145K
J0897Injection, denosumab, 1 mg14,100 · $290K
J2357Injection, omalizumab, 5 mg11,730 · $351K
J2182Injection, mepolizumab, 1 mg6,100 · $145K

Top 5 of 15 codes billed in 2024. Services · est. Medicare paid. The full list is one search in the app.

Reported industry relationships (2025)

Manufacturers with disclosed Open Payments records naming this provider in 2025: GlaxoSmithKline, LLC. · AstraZeneca Pharmaceuticals LP · GENZYME CORPORATION · Takeda Pharmaceuticals U.S.A., Inc. · Novartis Pharmaceuticals Corporation · and 13 more.

Also appears in Open Payments research records (funding associated with studies, not personal payments).

A payment record is a disclosed relationship under the Sunshine Act, not evidence this provider uses a product. Detail is in the app.

Part D prescribing (2024)

Ipratropium Bromide57 claims
Levocetirizine Dihydrochloride48 claims
Fluticasone/Umeclidin/Vilanter43 claims
Albuterol Sulfate39 claims
Prednisone39 claims

Top 5 drugs by Medicare Part D claim count. Drug-year lines under 11 claims are suppressed by CMS, so this understates low-volume prescribing.

This is the public slice. Year-over-year history, every code, payment detail, group affiliations, and phone numbers for Gregory Cowan are one search in Prospect 811.

Where this data comes from. Provider identity, specialty, and practice location come from CMS's public NPPES registry (the National Plan & Provider Enumeration System), the official record of every NPI ever issued. Deactivated NPIs are excluded. Addresses are what the provider filed and can lag a move. Where a profile shows Medicare context, it comes from CMS's public utilization, Part D, and Open Payments files: traditional Medicare fee-for-service only, and CMS suppresses any provider-and-code line under 11 beneficiaries before publishing. An Open Payments record is a disclosed relationship, not evidence a clinician uses a product. Prospect 811 organizes public data; it doesn't add to or alter it. Not affiliated with or endorsed by CMS. Full detail on the data page.

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