William Niemeyer, P.A.-C
NPI 1861435679 · Physician Assistant · Avon, CT
Enrolled with Medicare as Practitioner - Physician Assistant · source: CMS PECOS Public Provider Enrollment (2026.04.01)
William Niemeyer, P.A.-C is a Physician Assistant provider in Avon, CT (NPI 1861435679).
Provider details
- NPI number
- 1861435679
- Entity type
- Individual
- Primary specialty
- Physician AssistantPhysician Assistants & Advanced Practice Nursing Providers
- Credential
- P.A.-C
- Sex
- Male
- Sole proprietor
- No
- License
- PA01134 (RI)
Specialties & taxonomies
Physician Assistants & Advanced Practice Nursing Providers
Physician Assistants & Advanced Practice Nursing Providers
Physician Assistants & Advanced Practice Nursing Providers
Profile Score
A profile completeness & documented-activity index — NOT a quality, outcomes, or patient-satisfaction rating.
- Registry tenure33% of score
20 yrs in NPPES registry
- Profile completeness33% of score
100% of core fields populated
- Practice footprint20% of score
3 documented practice locations
- Open Payments transparency13% of score
Has Open Payments disclosures (2024)
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 prescribes (Medicare Part D)
Top drugs by Medicare Part D claim volume, 2024 · 4 distinct drugs on file.
| Drug | Part D claims (2024) | Beneficiaries |
|---|---|---|
| Methylprednisolone | 37 | 35 |
| Cephalexin | 17 | 17 |
| Amoxicillin/Potassium Clavbrand: Amoxicillin-Clavulanate Potass | 16 | 16 |
| Azithromycin | 16 | 16 |
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 no Part D record, 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.
$24 across 1 record (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
Additional practice locations (2)
- 1750 E Lake Shore DrDecatur, IL 62521-3803Phone: (317) 364-0833
- 310 Maple AveBarrington, RI 02806-3430Phone: (401) 903-0300Fax: (401) 337-5357
Registry dates
- Enumerated
- 2006-06-13
- Last updated
- 2020-09-21
- Certified
- 2020-09-21
Frequently asked questions
- What is William Niemeyer's NPI number?
- William Niemeyer's National Provider Identifier (NPI) is 1861435679, a unique 10-digit ID issued by CMS for use in standard healthcare transactions.
- What is William Niemeyer's specialty?
- William Niemeyer is listed in the NPPES registry with a primary specialty of Physician Assistant (Physician Assistants & Advanced Practice Nursing Providers).
- Where is William Niemeyer located?
- William Niemeyer's practice location on file with NPPES is 385 W Main St, Avon, CT 06001-4357.
- What is William Niemeyer's phone number?
- The practice phone number listed in the NPPES registry for William Niemeyer is (860) 777-1280.
- Does William Niemeyer accept Medicare?
- William Niemeyer is approved to bill Medicare according to CMS PECOS enrollment data (2026.04.01). Confirm current participation with the provider before scheduling.
- Is William Niemeyer's NPI active?
- Yes — William Niemeyer's NPI (1861435679) is active in the NPPES registry as of the last update on 2020-09-21.
Source: CMS NPPES Data Dissemination (June 2026). NPI Central is not affiliated with CMS. Data is provided as-is from the public registry.