Trevor Williams, PA-C
NPI 1477805554 · Physician Assistant · Bakersfield, CA
Enrolled with Medicare as Practitioner - Physician Assistant · source: CMS PECOS Public Provider Enrollment (2026.04.01)
Trevor Williams, PA-C is a Physician Assistant provider in Bakersfield, CA (NPI 1477805554).
Provider details
- NPI number
- 1477805554
- Entity type
- Individual
- Primary specialty
- Physician AssistantPhysician Assistants & Advanced Practice Nursing Providers
- Credential
- PA-C
- Sex
- Male
- Sole proprietor
- No
- License
- PA19786 (CA)
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
13 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
4,912 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) |
|---|---|---|
| Visit Complexity Inherent to Evaluation and Management Associated With Medical Care Services That Serve As the Continuing Focal Point for All Needed Health Care Services And/Or With Medical Care Services That Are Part of Ongoing Care Related to a Patient'SG2211 | 1,215 | $14 |
| Telephone Medical Discussion With Physician, 11-20 Minutes99442 | 1,140 | $79 |
| Annual Wellness Visit, Includes a Personalized Prevention Plan of Service (pps), Subsequent VisitG0439 | 380 | $113 |
| Telephone Medical Discussion With Physician, 5-10 Minutes99441 | 338 | $49 |
| Established Patient Office Or Other Outpatient Visit With Moderate Level of Decision Making, If Using Time, 30 Minutes Or More99214 | 314 | $110 |
| Annual Depression Screening, 5 to 15 Minutes |
What this provider prescribes (Medicare Part D)
Top drugs by Medicare Part D claim volume, 2024 · 171 distinct drugs on file.
| Drug | Part D claims (2024) | Beneficiaries |
|---|---|---|
| Levothyroxine Sodium | 632 | 150 |
| Atorvastatin Calcium | 468 | 129 |
| Amlodipine Besylate | 421 | 99 |
| Rosuvastatin Calcium | 346 | 97 |
| Omeprazole | 302 | 79 |
| Lisinopril | 269 | 86 |
| Dapagliflozin Propanediol |
Transparency — industry payments
Based on CMS Open Payments, 2024; not all care is captured.
$358 across 17 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
- 2012-10-12
- Last updated
- 2025-05-05
- Certified
- 2025-05-05
Frequently asked questions
- What is Trevor Williams's NPI number?
- Trevor Williams's National Provider Identifier (NPI) is 1477805554, a unique 10-digit ID issued by CMS for use in standard healthcare transactions.
- What is Trevor Williams's specialty?
- Trevor Williams is listed in the NPPES registry with a primary specialty of Physician Assistant (Physician Assistants & Advanced Practice Nursing Providers).
- Where is Trevor Williams located?
- Trevor Williams's practice location on file with NPPES is 6001 Truxtun Ave Ste D400, Bakersfield, CA 93309-0679.
- What is Trevor Williams's phone number?
- The practice phone number listed in the NPPES registry for Trevor Williams is (661) 323-8477.
- Does Trevor Williams accept Medicare?
- Trevor Williams is approved to bill Medicare according to CMS PECOS enrollment data (2026.04.01). Confirm current participation with the provider before scheduling.
- Is Trevor Williams's NPI active?
- Yes — Trevor Williams's NPI (1477805554) is active in the NPPES registry as of the last update on 2025-05-05.
Source: CMS NPPES Data Dissemination (June 2026). NPI Central is not affiliated with CMS. Data is provided as-is from the public registry.