Quick answers
- Does Kenneth G. Halliwell accept Medicare assignment?
- Yes. Medicare's clinician data says Kenneth G. Halliwell accepts Medicare assignment (the Medicare-approved amount as full payment for covered services), as of October 2, 2026. Ask the office to confirm before your visit.
- How many Medicare patients does Kenneth G. Halliwell see?
- In 2024, CMS data shows 194 Original Medicare patients and 379 services for Kenneth G. Halliwell. This counts Original Medicare only and measures volume, not quality.
- What is Kenneth G. Halliwell's NPI number?
- 1639338429. The NPI (National Provider Identifier) is the clinician's permanent federal ID; you can look it up in the official NPI Registry.
Medicare activity in 2024
Official CMS public-use data for Kenneth G. Halliwell, data year 2024 (released May 21, 2026). It covers Original Medicare (fee-for-service) patients only, not Medicare Advantage or other insurance. It shows volume, not quality or outcomes. CMS hides any count of 10 or fewer patients.
| Original Medicare patients | 194 |
|---|---|
| Services billed to Medicare | 379 |
| Different services or procedures | 13 |
| Participating Medicare provider | Yes |
| Average age of these patients | 70 |
Most frequent services
- Sleep study including heart rate, breathing, airflow, and effort (95806)88 services
- Established patient office or other outpatient visit with low level od decision making, if using time, 20 minutes or more (99213)84 services
- Sleep study in sleep lab with continuous airway pressure (6 years or older) (95811)72 services
- Established patient office or other outpatient visit with moderate level of decision making, if using time, 30 minutes or more (99214)70 services
- Sleep study in sleep lab (6 years or older) (95810)24 services
Chronic conditions among these patients
Share of this clinician’s Original Medicare patients with each condition, as published by CMS (it describes the patients, not the care given).
- High blood pressure75%
- High cholesterol75%
- Arthritis50%
- Ischemic heart disease35%
- Depression34%
- Anxiety32%
Practice locations
Addresses where Kenneth G. Halliwell is enrolled with Medicare (CMS data updated October 2, 2026).
- 325 Essjay RdWilliamsville, NY 14221 (716) 630‑1000
Group practices
Medicare enrollment lists Kenneth G. Halliwell as a member of this group (CMS data updated October 2, 2026).
- Buffalo Medical Group, P.C.236 clinicians in the group
Specialties
- Sleep Medicineprimary
- Neurologyalso
Other sleep medicine doctors in New York
Clinicians with the same Medicare primary specialty in New York — not a recommendation.
Other clinicians in Buffalo Medical Group, P.C.
Medicare enrollment lists these clinicians in the same group practice — not a recommendation.
Clinician information
| Credential | MD |
|---|---|
| Medical school | State University Of New York At Buffalo School Of Medicine |
| Graduation year | 2003 (23 years since medical school) |
| Gender (as listed) | Male |
| Medicare assignment | Accepts (Medicare-approved amount as full payment) |
| Telehealth | Offers telehealth services |
| NPI (National Provider Identifier) | 1639338429 |
| Corrections | Report an error or suggest an update → |
Most corrections must be made at the source: clinicians update their NPI Registry record (NPPES) and their Medicare enrollment (PECOS); this page follows the next data release.
Sources
- National Downloadable File (Doctors and Clinicians) — CMS, data updated October 2, 2026, retrieved October 29, 2026
- Medicare Physician & Other Practitioners - by Provider — CMS, data year 2024, released May 21, 2026; Medicare Physician & Other Practitioners - by Provider and Service
- NPI Registry — U.S. Department of Health and Human Services (NPPES), the clinician’s official record
- Medicare Care Compare — official Medicare tool to look up clinicians