Marc Klementowski, M.D.
NPI 1134196728 · Emergency Medicine Physician · Williamsville, NY
Enrolled with Medicare as Practitioner - Emergency Medicine · source: CMS PECOS Public Provider Enrollment (2026.04.01)
Marc Klementowski, M.D. is a Emergency Medicine Physician provider in Williamsville, NY (NPI 1134196728).
Provider details
- NPI number
- 1134196728
- Entity type
- Individual
- Primary specialty
- Emergency Medicine PhysicianAllopathic & Osteopathic Physicians
- Credential
- M.D.
- Sex
- Male
- Sole proprietor
- No
- License
- 188748 (NY)
Specialties & taxonomies
Allopathic & Osteopathic Physicians
Profile Score
A profile completeness & documented-activity index — NOT a quality, outcomes, or patient-satisfaction rating.
- Registry tenure28% of score
20 yrs in NPPES registry
- Profile completeness28% of score
100% of core fields populated
- Practice footprint17% of score
1 documented practice location
- Medicare service volume (vs. specialty peers)28% of score
238 Medicare services, 2024 (ranked within specialty)
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 methodology.
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) |
|---|---|---|
| Emergency Department Visit With High Level of Medical Decision Making99285 | 106 | $165 |
| Emergency Department Visit With Moderate Level of Medical Decision Making99284 | 71 | $114 |
| Routine Electrocardiogram (ecg) Using at Least 12 Leads With Interpretation and Report Only93010 | 31 | $8 |
| Emergency Department Visit With Low Level of Medical Decision Making99283 | 15 | $67 |
| Critical Care, First 30-74 Minutes99291 | 15 | $201 |
Typical Medicare-allowed amounts for these services range $8–$201 (2024). The Medicare-allowed amount is what Medicare recognizes for a service under fee-for-service — a reference figure for 2024, not a price quote and not what you would be billed. Medicare Part B covers roughly an eighth of all NPIs (65+ skew); services with fewer than 11 beneficiaries are suppressed by CMS. Source: CMS Medicare Physician & Other Practitioners, by Provider & Service.
What this provider prescribes (Medicare Part D)
Top drugs by Medicare Part D claim volume, 2024 · 8 distinct drugs on file.
| Drug | Part D claims (2024) | Beneficiaries |
|---|---|---|
| Prednisone | 59 | 57 |
| Ondansetronbrand: Ondansetron Odt | 39 | 39 |
| Hydrocodone/Acetaminophenbrand: Hydrocodone-Acetaminophen | 33 | 32 |
| Sulfamethoxazole/Trimethoprimbrand: Sulfamethoxazole-Trimethoprim | 29 | 29 |
| Cefdinir | 28 | 28 |
| Ibuprofen | 19 | 19 |
| Naproxen | 19 |
Practice location
Mailing address
Registry dates
- Enumerated
- 2006-03-02
- Last updated
- 2007-11-20
Frequently asked questions
- What is Marc Klementowski's NPI number?
- Marc Klementowski's National Provider Identifier (NPI) is 1134196728, a unique 10-digit ID issued by CMS for use in standard healthcare transactions.
- What is Marc Klementowski's specialty?
- Marc Klementowski is listed in the NPPES registry with a primary specialty of Emergency Medicine Physician (Allopathic & Osteopathic Physicians).
- Where is Marc Klementowski located?
- Marc Klementowski's practice location on file with NPPES is 6653 Main St, Williamsville, NY 14221-5906.
- What is Marc Klementowski's phone number?
- The practice phone number listed in the NPPES registry for Marc Klementowski is (716) 204-4500.
- Does Marc Klementowski accept Medicare?
- Marc Klementowski is approved to bill Medicare according to CMS PECOS enrollment data (2026.04.01). Confirm current participation with the provider before scheduling.
- Is Marc Klementowski's NPI active?
- Yes — Marc Klementowski's NPI (1134196728) is active in the NPPES registry as of the last update on 2007-11-20.
Source: CMS NPPES Data Dissemination (June 2026). NPI Central is not affiliated with CMS. Data is provided as-is from the public registry.