Kenneth Halliwell, M.D.
NPI 1639338429 · Neurology Physician · Williamsville, NY
Enrolled with Medicare as Practitioner - Sleep Medicine · source: CMS PECOS Public Provider Enrollment (2026.04.01)
Kenneth Halliwell, M.D. is a Neurology Physician provider in Williamsville, NY (NPI 1639338429).
Provider details
- NPI number
- 1639338429
- Entity type
- Individual
- Primary specialty
- Neurology PhysicianAllopathic & Osteopathic Physicians
- Credential
- M.D.
- Sex
- Male
- Sole proprietor
- Yes
- License
- 248880 (NY)
Specialties & taxonomies
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
18 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
362 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) |
|---|---|---|
| Sleep Study Including Heart Rate, Breathing, Airflow, and Effort95806 | 88 | $89 |
| Established Patient Office Or Other Outpatient Visit With Low Level OD Decision Making, If Using Time, 20 Minutes Or More99213 | 84 | $86 |
| Sleep Study in Sleep Lab With Continuous Airway Pressure (6 Years Or Older)95811 | 72 | $611 |
| Established Patient Office Or Other Outpatient Visit With Moderate Level of Decision Making, If Using Time, 30 Minutes Or More99214 | 70 | $122 |
| Sleep Study in Sleep Lab (6 Years Or Older)95810 | 24 | $569 |
| New Patient Office Or Other Outpatient Visit With Moderate Level of Medical Decision Making, If Using Time, 45 Minutes Or More |
What this provider prescribes (Medicare Part D)
Top drugs by Medicare Part D claim volume, 2024 · 7 distinct drugs on file.
| Drug | Part D claims (2024) |
|---|---|
| Zolpidem Tartrate | 27 |
| Zaleplon | 19 |
| Modafinil | 16 |
| Dextroamphetamine/Amphetaminebrand: Dextroamphetamine-Amphetamine | 13 |
| Clonidine Hcl | 12 |
| Sodium Oxybatebrand: Xyrem | 12 |
| Sodium,calcium,mag,pot Oxybatebrand: Xywav | 12 |
Medicare Part D only. These counts cover prescriptions paid through Medicare Part D in 2024 — they do notinclude cash-pay, commercial-insurance, Medicaid, or Part B–administered drugs, and badly undercount high cash-pay categories (e.g. GLP-1 weight-loss, testosterone, and ED medications). Any drug with 10 or fewer claims is omitted by CMS, and beneficiary counts under 11 are suppressed — so a missing drug means , never zero. This is a factual claims summary, not an endorsement, not medical advice, and not a consumer report. Source: CMS Medicare Part D Prescribers — by Provider and Drug.
Transparency — industry payments
Based on CMS Open Payments, 2024; not all care is captured.
$33,426 across 86 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
- 2008-06-05
- Last updated
- 2022-02-28
- Certified
- 2022-02-28
Frequently asked questions
- What is Kenneth Halliwell's NPI number?
- Kenneth Halliwell's National Provider Identifier (NPI) is 1639338429, a unique 10-digit ID issued by CMS for use in standard healthcare transactions.
- What is Kenneth Halliwell's specialty?
- Kenneth Halliwell is listed in the NPPES registry with a primary specialty of Neurology Physician (Allopathic & Osteopathic Physicians).
- Where is Kenneth Halliwell located?
- Kenneth Halliwell's practice location on file with NPPES is 325 Essjay Rd, Williamsville, NY 14221-8243.
- What is Kenneth Halliwell's phone number?
- The practice phone number listed in the NPPES registry for Kenneth Halliwell is (716) 630-1122.
- Does Kenneth Halliwell accept Medicare?
- Kenneth Halliwell is approved to bill Medicare according to CMS PECOS enrollment data (2026.04.01). Confirm current participation with the provider before scheduling.
- Is Kenneth Halliwell's NPI active?
- Yes — Kenneth Halliwell's NPI (1639338429) is active in the NPPES registry as of the last update on 2022-02-28.
Source: CMS NPPES Data Dissemination (June 2026). NPI Central is not affiliated with CMS. Data is provided as-is from the public registry.