Olivia Williamson, PA-C
NPI 1477338184 · Physician Assistant · Sebewaing, MI
Enrolled with Medicare as Practitioner - Physician Assistant · source: CMS PECOS Public Provider Enrollment (2026.04.01)
Olivia Williamson, PA-C is a Physician Assistant provider in Sebewaing, MI (NPI 1477338184).
Provider details
- NPI number
- 1477338184
- Entity type
- Individual
- Primary specialty
- Physician AssistantPhysician Assistants & Advanced Practice Nursing Providers
- Credential
- PA-C
- Sex
- Female
- Sole proprietor
- No
Specialties & taxonomies
Physician Assistants & Advanced Practice Nursing Providers
Profile Score
A profile completeness & documented-activity index — NOT a quality, outcomes, or patient-satisfaction rating.
- Registry tenure25% of score
2 yrs in NPPES registry
- Profile completeness25% of score
83% of core fields populated
- Practice footprint15% of score
3 documented practice locations
- Medicare service volume (vs. specialty peers)25% of score
164 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) |
|---|---|---|
| Emergency Department Visit With Moderate Level of Medical Decision Making99284 | 64 | $100 |
| Emergency Department Visit With Low Level of Medical Decision Making99283 | 61 | $59 |
| Emergency Department Visit With High Level of Medical Decision Making99285 | 27 | $144 |
| Emergency Department Visit With Straightforward Medical Decision Making99282 | 12 | $35 |
Typical Medicare-allowed amounts for these services range $35–$144 (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 · 4 distinct drugs on file.
| Drug | Part D claims (2024) | Beneficiaries |
|---|---|---|
| Cephalexin | 36 | 35 |
| Hydrocodone/Acetaminophenbrand: Hydrocodone-Acetaminophen | 31 | 30 |
| Prednisone | 14 | 14 |
| Ondansetronbrand: Ondansetron Odt | 13 | 13 |
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.
$844 across 30 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
Additional practice locations (2)
- 4497 Sheffield PlBay City, MI 48706-2554Phone: (989) 894-8400
- 4005 Orchard DrMidland, MI 48670-2001Phone: (989) 839-3100
Registry dates
- Enumerated
- 2023-08-30
- Last updated
- 2024-09-15
- Certified
- 2024-09-09
Frequently asked questions
- What is Olivia Williamson's NPI number?
- Olivia Williamson's National Provider Identifier (NPI) is 1477338184, a unique 10-digit ID issued by CMS for use in standard healthcare transactions.
- What is Olivia Williamson's specialty?
- Olivia Williamson is listed in the NPPES registry with a primary specialty of Physician Assistant (Physician Assistants & Advanced Practice Nursing Providers).
- Where is Olivia Williamson located?
- Olivia Williamson's practice location on file with NPPES is 106 E Main St, Sebewaing, MI 48759-1568.
- What is Olivia Williamson's phone number?
- The practice phone number listed in the NPPES registry for Olivia Williamson is (989) 883-3800.
- Does Olivia Williamson accept Medicare?
- Olivia Williamson is approved to bill Medicare according to CMS PECOS enrollment data (2026.04.01). Confirm current participation with the provider before scheduling.
- Is Olivia Williamson's NPI active?
- Yes — Olivia Williamson's NPI (1477338184) is active in the NPPES registry as of the last update on 2024-09-15.
Source: CMS NPPES Data Dissemination (June 2026). NPI Central is not affiliated with CMS. Data is provided as-is from the public registry.