Gary Kay, M.D.
NPI 1205897923 · Hematology & Oncology Physician · Elk Grove Village, IL
Enrolled with Medicare as Practitioner - Hematology/Oncology · source: CMS PECOS Public Provider Enrollment (2026.04.01)
Gary Kay, M.D. is a Hematology & Oncology Physician provider in Elk Grove Village, IL (NPI 1205897923).
Provider details
- NPI number
- 1205897923
- Entity type
- Individual
- Primary specialty
- Hematology & Oncology PhysicianAllopathic & Osteopathic Physicians
- Credential
- M.D.
- Sex
- Male
- Sole proprietor
- No
Specialties & taxonomies
Allopathic & Osteopathic Physicians
Profile Score
A profile completeness & documented-activity index — NOT a quality, outcomes, or patient-satisfaction rating.
- Registry tenure25% of score
20 yrs in NPPES registry
- Profile completeness25% of score
83% of core fields populated
- Practice footprint15% of score
1 documented practice location
- Medicare service volume (vs. specialty peers)25% of score
2,194 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) |
|---|---|---|
| Complete Blood Cell Count (red Cells, White Blood Cell, Platelets), Automated Test and Automated Differential White Blood Cell Count85025 | 511 | $8 |
| Blood Test, Comprehensive Group of Blood Chemicals80053 | 335 | $10 |
| Established Patient Office Or Other Outpatient Visit With Moderate Level of Decision Making, If Using Time, 30 Minutes Or More99214 | 302 | $129 |
| Gammaglobulin (immune System Protein) Measurement82784 | 165 | $9 |
| Established Patient Office Or Other Outpatient Visit With Low Level OD Decision Making, If Using Time, 20 Minutes Or More99213 | 148 | $93 |
| Injection of Drug Or Substance Under Skin Or Into Muscle96372 | 113 |
What this provider prescribes (Medicare Part D)
Top drugs by Medicare Part D claim volume, 2024 · 13 distinct drugs on file.
| Drug | Part D claims (2024) | Beneficiaries |
|---|---|---|
| Letrozole | 91 | 23 |
| Apixabanbrand: Eliquis | 53 | — |
| Gabapentin | 35 | — |
| Dexamethasone | 29 | — |
| Warfarin Sodium | 28 | — |
| Anastrozole | 27 | — |
| Lenalidomidebrand: Revlimid | 26 | — |
Transparency — industry payments
Based on CMS Open Payments, 2024; not all care is captured.
$15,383 across 75 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
- 2006-03-31
- Last updated
- 2007-07-08
Frequently asked questions
- What is Gary Kay's NPI number?
- Gary Kay's National Provider Identifier (NPI) is 1205897923, a unique 10-digit ID issued by CMS for use in standard healthcare transactions.
- What is Gary Kay's specialty?
- Gary Kay is listed in the NPPES registry with a primary specialty of Hematology & Oncology Physician (Allopathic & Osteopathic Physicians).
- Where is Gary Kay located?
- Gary Kay's practice location on file with NPPES is 800 Biesterfield Rd, Elk Grove Village, IL 60007-3311.
- What is Gary Kay's phone number?
- The practice phone number listed in the NPPES registry for Gary Kay is (847) 437-3312.
- Does Gary Kay accept Medicare?
- Gary Kay is approved to bill Medicare according to CMS PECOS enrollment data (2026.04.01). Confirm current participation with the provider before scheduling.
- Is Gary Kay's NPI active?
- Yes — Gary Kay's NPI (1205897923) is active in the NPPES registry as of the last update on 2007-07-08.
Source: CMS NPPES Data Dissemination (June 2026). NPI Central is not affiliated with CMS. Data is provided as-is from the public registry.