Hollis Walker, M.D.
NPI 1053622290 · Hematology & Oncology Physician · Elmhurst, IL
Enrolled with Medicare as Practitioner - Hematology/Oncology · source: CMS PECOS Public Provider Enrollment (2026.04.01)
Hollis Walker, M.D. is a Hematology & Oncology Physician provider in Elmhurst, IL (NPI 1053622290).
Provider details
- NPI number
- 1053622290
- Entity type
- Individual
- Primary specialty
- Hematology & Oncology PhysicianAllopathic & Osteopathic Physicians
- Credential
- M.D.
- Sex
- Male
- Sole proprietor
- No
- License
- 036.141268 (IL)
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
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
1,078 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) |
|---|---|---|
| Established Patient Office Or Other Outpatient Visit With High Level of Medical Decision Making, If Using Time, 40 Minutes Or More99215 | 303 | $152 |
| Established Patient Office Or Other Outpatient Visit With Moderate Level of Decision Making, If Using Time, 30 Minutes Or More99214 | 284 | $101 |
| Visit Complexity Inherent to Evaluation and Management Associated With Medical Care Services That Serve As the Continuing Focal Point for All Needed Health Care Services And/Or With Medical Care Services That Are Part of Ongoing Care Related to a Patient'SG2211 | 169 | $17 |
| Subsequent Hospital Care With Moderate Levelof Medical Decision Making, If Using Time, at Least 50 Minutes99233 | 106 | $125 |
| Initial Hospital Care With Moderate Level of Medical Decision Making, If Using Time, at Least 75 Minutes99223 | 49 | $182 |
What this provider prescribes (Medicare Part D)
Top drugs by Medicare Part D claim volume, 2024 · 10 distinct drugs on file.
| Drug | Part D claims (2024) | Beneficiaries |
|---|---|---|
| Apixabanbrand: Eliquis | 61 | 16 |
| Rivaroxabanbrand: Xarelto | 54 | 15 |
| Lenalidomide | 35 | — |
| Hydroxyurea | 28 | 11 |
| Darolutamidebrand: Nubeqa | 17 | — |
| Zanubrutinibbrand: Brukinsa | 16 | — |
| Mirtazapine | 16 |
Transparency — industry payments
Based on CMS Open Payments, 2024; not all care is captured.
$123 across 5 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
- 2010-06-22
- Last updated
- 2016-12-09
Frequently asked questions
- What is Hollis Walker's NPI number?
- Hollis Walker's National Provider Identifier (NPI) is 1053622290, a unique 10-digit ID issued by CMS for use in standard healthcare transactions.
- What is Hollis Walker's specialty?
- Hollis Walker is listed in the NPPES registry with a primary specialty of Hematology & Oncology Physician (Allopathic & Osteopathic Physicians).
- Where is Hollis Walker located?
- Hollis Walker's practice location on file with NPPES is 177 E Brush Hill Rd, Elmhurst, IL 60126-5658.
- What is Hollis Walker's phone number?
- The practice phone number listed in the NPPES registry for Hollis Walker is (331) 221-5900.
- Does Hollis Walker accept Medicare?
- Hollis Walker is approved to bill Medicare according to CMS PECOS enrollment data (2026.04.01). Confirm current participation with the provider before scheduling.
- Is Hollis Walker's NPI active?
- Yes — Hollis Walker's NPI (1053622290) is active in the NPPES registry as of the last update on 2016-12-09.
Source: CMS NPPES Data Dissemination (June 2026). NPI Central is not affiliated with CMS. Data is provided as-is from the public registry.