TREVOR D. WILLIAMS PA-C
NPI 1477805554
Physician Assistant in Bakersfield, CA

Quality Rating: 75 out of 100 score

NPI Status: Active since October 12, 2012

Contact Information

6001 TRUXTUN AVE STE D400
BAKERSFIELD, CA
ZIP 93309
Phone: (661) 323-8477
Fax: (661) 323-8472

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Table of Contents

NPI Profile Information
Primary Taxonomy
Medicare Participation & PECOS Status
Areas of Expertise
Durable Medical Equipment
Physician Visit Costs
Overall Quality Performance
Quality Reporting
NPI Validation
Frequently Asked Questions

Individual
Male
Years of Experience 19
Physician Assistant
Accepts Medicare Approved Payment
PECOS Enrolled
Medicare Quality Reporting

About TREVOR WILLIAMS

This page provides the complete NPI Profile along with additional information for Trevor Williams, a primary care provider established in Bakersfield, California with a medical specialization in Physician Assistant and more than 19 years of experience. The healthcare provider is registered in the NPI registry with number 1477805554 assigned on October 2012. The practitioner's primary taxonomy code is 363A00000X with license number PA19786 (CA). The provider is registered as an individual and his NPI record was last updated one year ago.

NPI: 1477805554
Provider Name: TREVOR D. WILLIAMS PA-C
Gender: Male
Entity Type: Individual
Location Address: 6001 TRUXTUN AVE STE D400 BAKERSFIELD, CA 93309
Location Phone: (661) 323-8477
Location Fax: (661) 323-8472
Mailing Address: PO BOX 1139 BAKERSFIELD, CA 93302
Mailing Phone: (661) 371-2796
Mailing Fax: (661) 323-8472
Medical School Name: OTHER
Graduation Year: 2008
Is Sole Proprietor?: No
Enumeration Date: 10-12-2012
Last Update Date: 05-05-2025
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A primary care provider (PCP) like Trevor Williams sees people with common medical problems. The primary care provider might be a doctor, physician assistant, nurse practitioner or clinic that are usually involved in your long-term care. A PCP might provide preventive care, treat common medical conditions, identify urgent medical problems and refer you to specialists when necessary. Primary care is usually provided in an outpatient facility but if you are admitted to a hospital your PCP may assist in your care. The most common medical conditions seen by primary care providers are: hypertension, upper respiratory tract infections, depression or anxiety, back pain, arthritis, dermatitis, diabetes, urinary tract infections, etc

Location Map

Specialty - Primary Taxonomy

The NPI enumerator requires providers to submit at least one taxonomy code. A taxonomy code is a unique 10-character code that describes the healthcare provider type, classification, and the area of specialization. There could be only one primary taxonomy code per NPI record. For individual NPIs the license data is associated to the taxonomy code.

Classification: Physician Assistant
Taxonomy Code: 363A00000X
Type: Physician Assistants & Advanced Practice Nursing Providers
License No.: PA19786
License State: CA
Taxonomy Description: A physician assistant is a person who has successfully completed an accredited education program for physician assistant, is licensed by the state and is practicing within the scope of that license. Physician assistants are formally trained to perform many of the routine, time-consuming tasks a physician can do. In some states, they may prescribe medications. They take medical histories, perform physical exams, order lab tests and x-rays, and give inoculations. Most states require that they work under the supervision of a physician.

Medicare Participation & PECOS Enrollment Status

Trevor Williams is registered with Medicare and accepts claims assignment, this means the provider accepts the approved amount for the cost of rendered services as full payment. Participating providers may not charge beneficiaries more than the approved amount for their services. Please keep in mind that beneficiaries still have to pay a coinsurance or copayment amount for a visit or service.

Trevor Williams is enrolled in PECOS and is eligible to order or refer health care services for Medicare patients. The provider is eligible to order or refer: Part B Clinical Laboratory and Imaging, Durable Medical Equipment (DME), a Home Health Agency (HHA) and Power Mobility Devices.

What is PECOS?
PECOS is the online Medicare enrollment management system or Provider, Enrollment, Chain and Ownership System. The PECOS system is a database of providers who have registered with CMS as providers or suppliers. PECOS is the primary source of information about verified Medicare professionals. Providers that want to participate in this program need to enroll in PECOS with their NPI number to avoid denied claims.

Is the provider registered in PECOS? Yes
PECOS PAC ID: 6103079082
What is the PECOS Associate Control ID?
A PAC ID is a unique 10-digit number assigned to an individual or organization healthcare provider in PECOS. The PAC ID is used to link together all the provider information, like tax identification numbers and organizational names. A PAC ID can be connected to multiple Enrollment IDs if an individual or organization has enrolled in PECOS more than once.
PECOS Enrollment ID: I20121228000135
What is the Provider Enrollment ID?
The Enrollment ID is a unique alphanumeric 15-digit code assigned to each new provider's PECOS enrollment application. The Enrollment ID is used to link together all the provider enrollment information like enrollment type, state, provider specialty, and reassignment of benefits.
Accepts Medicare Assignment? Yes
What does it mean "accepts medicare assignment"?
When a provider accepts Medicare assignment, the provider agrees to be paid directly by Medicare and to accept the payment amount approved by Medicare. Additionally, the provider agrees to not bill patients for more than the Medicare deductible and coinsurance amounts.
A provider who doesn't accept assignment may charge you up to 15% over the Medicare-approved amount. This is known as the limiting charge. You may have to pay this amount, or it may be covered by another insurer.
Eligible to Order or Refer Part B Clinical Laboratory and Imaging: Yes
Eligible to Order or Refer Durable Medical Equipment (DMEPOS): Yes
Eligible to Order or Refer a Home Health Agency (HHA): Yes
Eligible to Order or Refer Power Mobility Devices: Yes

Provider Referred Orders for Durable Medical Equipment, Devices & Supplies

The following list reflects the services, supplies or durable medical equipment ordered by this provider to a DME supplier on behalf of patients. The information below is derived from Medicare claims data and reflects the BETOS category, HCPCS code information and the number times each service was submitted under the Medicare fee-for-service program.

Durable Medical Equipment

DME-Other DME (DE017N)
Blood glucose test or reagent strips for home blood glucose monitor, per 50 strips (HCPCS:A4253)
34 DME suppliers used 134 Medicare Claims 310 Services Paid
DME-Medical/Surgical Supplies (DA000N)
Lancets, per box of 100 (HCPCS:A4259)
28 DME suppliers used 69 Medicare Claims 73 Services Paid
DME-Other DME (DE001N)
Full face mask used with positive airway pressure device, each (HCPCS:A7030)
4 DME suppliers used 19 Medicare Claims 19 Services Paid
DME-Other DME (DE001N)
Face mask interface, replacement for full face mask, each (HCPCS:A7031)
4 DME suppliers used 13 Medicare Claims 35 Services Paid
DME-Other DME (DE001N)
Nasal interface (mask or cannula type) used with positive airway pressure device, with or without head strap (HCPCS:A7034)
3 DME suppliers used 11 Medicare Claims 11 Services Paid
DME-Other DME (DE001N)
Headgear used with positive airway pressure device (HCPCS:A7035)
4 DME suppliers used 18 Medicare Claims 18 Services Paid
DME-Other DME (DE001N)
Tubing used with positive airway pressure device (HCPCS:A7037)
3 DME suppliers used 18 Medicare Claims 18 Services Paid
DME-Other DME (DE001N)
Filter, disposable, used with positive airway pressure device (HCPCS:A7038)
4 DME suppliers used 28 Medicare Claims 152 Services Paid
DME-Other DME (DE001N)
Respiratory assist device, bi-level pressure capability, without backup rate feature, used with noninvasive interface, e.g., nasal or facial mask (intermittent assist device with continuous positive airway pressure device) (HCPCS:E0470)
2 DME suppliers used 30 Medicare Claims 30 Services Paid
DME-Other DME (DE001N)
Humidifier, heated, used with positive airway pressure device (HCPCS:E0562)
1 DME suppliers used 17 Medicare Claims 17 Services Paid
DME-Other DME (DE001N)
Continuous positive airway pressure (cpap) device (HCPCS:E0601)
1 DME suppliers used 23 Medicare Claims 23 Services Paid
DME-Oxygen and Supplies (DC002N)
Oxygen concentrator, single delivery port, capable of delivering 85 percent or greater oxygen concentration at the prescribed flow rate (HCPCS:E1390)
4 DME suppliers used 30 Medicare Claims 30 Services Paid
DME-Oxygen and Supplies (DC002N)
Portable oxygen concentrator, rental (HCPCS:E1392)
2 DME suppliers used 12 Medicare Claims 12 Services Paid
DME-Wheelchairs (DD000N)
Standard wheelchair (HCPCS:K0001)
1 DME suppliers used 14 Medicare Claims 14 Services Paid
DME-Other DME (DE017N)
Supply allowance for therapeutic continuous glucose monitor (cgm), includes all supplies and accessories, 1 month supply = 1 unit of service (HCPCS:K0553)
3 DME suppliers used 51 Medicare Claims 51 Services Paid

Areas of Expertise

The following services and procedures, recently provided to Medicare patients, illustrate the range of care this provider offers. This list reflects the variety of services available to all patients visiting the practice and is based on 2022 Medicare dataset. In general, the more frequently a provider treats specific conditions or performs particular procedures, the more experienced they become in addressing similar patient needs. The provider has delivered many of the services listed below to Medicare patients. Please note that this list does not include services provided to patients who are not covered by Medicare.

Administration of pneumococcal vaccine
Annual alcohol misuse screening, 15 minutes
Annual depression screening, 15 minutes
Annual wellness visit, includes a personalized prevention plan of service (pps), subsequent visit
Annual wellness visit; includes a personalized prevention plan of service (pps), initial visit
Aspiration and/or injection of fluid from large joint
Ct scan of heart with evaluation of blood vessel calcium
Established patient office or other outpatient visit, 20-29 minutes
Established patient office or other outpatient visit, 30-39 minutes
Initial preventive physical examination; face-to-face visit, services limited to new beneficiary during the first 12 months of medicare enrollment
Injection of drug or substance under skin or into muscle
Injection, ceftriaxone sodium, per 250 mg
Injection, ketorolac tromethamine, per 15 mg
Injection, triamcinolone acetonide, not otherwise specified, 10 mg
Injection, vitamin b-12 cyanocobalamin, up to 1000 mcg
Insertion of needle into vein for collection of blood sample
Pneumococcal vaccine, 23-valent
Removal of impacted ear wax by washing
Routine electrocardiogram (ecg) using at least 12 leads with interpretation and report
Smoking and tobacco use intensive counseling, 4-10 minutes
Telephone medical discussion with physician, 11-20 minutes
Telephone medical discussion with physician, 21-30 minutes
Telephone medical discussion with physician, 5-10 minutes
Urinalysis, manual test

Physician Visit Costs

The typical physician office visit costs for Medicare beneficiaries in this area are: $22.77 for a new patient copayment and $18.41 for an established patient copayment.

The pricing information below displays the copayment minimum, maximum and average amount that patients under Medicare are charged when visiting this provider as a new or established patient. Please keep in mind that these prices are just for reference purposes, and the actual prices charged by the provider might be different.

For patients covered under private health plans the prices below are also useful as healthcare pricing for private insurance is usually established as a function of Medicare prices. Private insurance covered patients should check their individual plans to determine the exact pricing.

The prices below reflect the costs for new and established patients in the 93309 ZIP code area.

New Patients Visit Costs *

The most utilized procedure code for new patients office visits is 99203

Average New Patient Price $91.09
Minimum New Patient Price $59.26
Maximum New Patient Price $178.09

Average New Patient Copayment $22.77
Minimum New Patient Copayment $14.81
Maximum New Patient Copayment $44.52

Established Patients Visit Costs *

The most utilized procedure code for established patients office visits is 99213

Average Established Patient Price $73.67
Minimum Established Patient Price $19.34
Maximum Established Patient Price $145.64

Average Established Patient Copayment $18.41
Minimum Established Patient Copayment $4.83
Maximum Established Patient Copayment $36.41

* The physician office visit costs information is generated by statistical analysis of similar providers in the same geographical area. The pricing information above IS NOT the amount charged by this provider.

Overall MIPS Quality Performance

The provider participated in CMS Quality Payment Program under the Merit-based Incentive Payment System (MIPS) and has an overall final score of 75, based on four performance areas: quality, improvement activities, promoting interoperability, and cost. The purpose of this information is to help people with Medicare make informed decisions and incentivize doctors and clinicians to maximize performance.

The Merit-based Incentive Payment System (MIPS) is a way providers could use to participate in CMS Quality Payment Program (QPP). The MIPS program affects clinician reimbursement for Part B covered professional services and also rewards them for improving the quality of patient care and outcomes.

Final Score: 75 out of 100

The MIPS program evaluates providers across multiple categories with a specific weight for each category resulting a in a MIPS final score that ranges from 0 to 100 points. The MIPS Final Score determines whether providers receive a negative, neutral or positive MIPS payment adjustment.
Quality Score: N/A

The Quality category assesses providers performance on clinical practices and patient outcomes under the traditional MIPS program. The quality measures help identify the quality of healthcare processes, outcomes, and patient experiences. The Quality measure category compromises 40% providers final MPIS scores.

There are six collection types for MIPS quality measures: Electronic Clinical Quality Measures (eCQMs), MIPS Clinical Quality Measures (CQMs), Qualified Clinical Data Registry (QCDR) Measures, Medicare Part B claims measures, CMS Web Interface measures and The Consumer Assessment of Healthcare Providers and Systems (CAHPS) for MIPS Survey.
Promoting Interoperability Score: N/A

The Interoperability category measures the providers ability to use technology to exchange and make use of healthcare information in a way that is less burdensome and improves outcomes. The Interoperability measure category compromises 25% providers final MPIS scores.

The MIPS Interoperability measure focuses on the use of certified electronic health record technology (CEHRT) to improve patient access health information, the exchange of information between clinicians and pharmacies and the systematic collection, analysis, and interpretation of healthcare data.
Improvement Activities Score: N/A

The Improvement Activities performance category evaluates the providers participation in clinical activities that support the improvement of clinical practice, care delivery, and outcomes. Providers have the option to choose 2 to 4 activities from an inventory of over 100 improvement activities. Providers typically choose the activities that best fit their needs. The improvement activities measure category compromises 15% providers final MPIS scores.

The Improvement measures aim to better patient engagement, patient safety and other areas of patient care. The Improvement Activities category compromises 15% of providers final MPIS scores.
Cost Score: N/A

The Cost performance category asses the amount and types of services provided and how clinicians coordinate care and seek improvement of health outcomes by ensuring patients receive the appropriate services.

Although providers don't determine the price of healthcare services they are important in delivering high-quality care at a reasonable cost. The Cost measures category compromises 20% of providers final MPIS scores.
Cost Score: N/A

The Cost performance category asses the amount and types of services provided and how clinicians coordinate care and seek improvement of health outcomes by ensuring patients receive the appropriate services.

Although providers don't determine the price of healthcare services they are important in delivering high-quality care at a reasonable cost. The Cost measures category compromises 20% of providers final MPIS scores.

Quality Reporting

The provider participated in CMS Quality Payment Program. The Quality Payment Program aims to improve population health, reduce costs and improve the care received by Medicare beneficiaries. The following quality measures meet Medicare's statistical reporting standards. Not all providers report the same information, because not all providers give the same services to patients. The quality information is just a snapshot of some the care providers give to their patients. Reporting more or less information is not a reflection of quality.

Quality Measure	Performance	Number of Patients
Care Plan	100%	617
Percentage of patients aged 65 years and older who have an advance care plan or surrogate decision maker documented in the medical record that an advance care plan was discussed but the patient did not wish or was not able to name a surrogate decision maker or provide an advance care plan
Chronic Care and Preventative Care Management for Empaneled Patients	Yes	N/A
Proactively manage chronic and preventive care for empaneled patients that could include one or more of the following: • Provide patients annually with an opportunity for development and/or adjustment of an individualized plan of care as appropriate to age and health status, including health risk appraisal; gender, age and condition-specific preventive care services; and plan of care for chronic conditions; • Use condition-specific pathways for care of chronic conditions (e.g., hypertension, diabetes, depression, asthma and heart failure) with evidence-based protocols to guide treatment to target; such as a CDC-recognized diabetes prevention program; • Use pre-visit planning to optimize preventive care and team management of patients with chronic conditions; • Use panel support tools (registry functionality) to identify services due; • Use predictive analytical models to predict risk, onset and progression of chronic diseases; or • Use reminders and outreach (e.g., phone calls, emails, postcards, patient portals and community health workers where available) to alert and educate patients about services due; and/or routine medication reconciliation.
Documentation of Current Medications in the Medical Record	100%	5017
Percentage of visits for patients aged 18 years and older for which the eligible professional or eligible clinician attests to documenting a list of current medications using all immediate resources available on the date of the encounter. This list must include ALL known prescriptions, over-the-counters, herbals, and vitamin/mineral/dietary (nutritional) supplements AND must contain the medications' name, dosage, frequency and route of administration
Engagement of New Medicaid Patients and Follow-up	Yes	N/A
Seeing new and follow-up Medicaid patients in a timely manner, including individuals dually eligible for Medicaid and Medicare. A timely manner is defined as within 10 business days for this activity.
e-Prescribing	49%	2969
At least one permissible prescription written by the MIPS eligible clinician is queried for a drug formulary and transmitted electronically using certified EHR technology.
Health Information Exchange	24%	305
The MIPS eligible clinician that transitions or refers their patient to another setting of care or health care clinician (1) uses CEHRT to create a summary of care record; and (2) electronically transmits such summary to a receiving health care clinician for at least one transition of care or referral.
Immunization Registry Reporting	Yes	N/A
The MIPS eligible clinician is in active engagement with a public health agency to submit immunization data.
Implementation of medication management practice improvements	Yes	N/A
Manage medications to maximize efficiency, effectiveness and safety that could include one or more of the following: Reconcile and coordinate medications and provide medication management across transitions of care settings and eligible clinicians or groups; Integrate a pharmacist into the care team; and/or Conduct periodic, structured medication reviews.
Medication Reconciliation	100%	24
The MIPS eligible clinician performs medication reconciliation for at least one transition of care in which the patient is transitioned into the care of the MIPS eligible clinician.
Patient-Specific Education	83%	789
The MIPS eligible clinician must use clinically relevant information from CEHRT to identify patient-specific educational resources and provide access to those materials to at least one unique patient seen by the MIPS eligible clinician.
Preventive Care and Screening: Body Mass Index (BMI) Screening and Follow-Up Plan	100%	1436
Percentage of patients aged 18 years and older with a BMI documented during the current encounter or during the previous twelve months AND with a BMI outside of normal parameters, a follow-up plan is documented during the encounter or during the previous twelve months of the current encounter Normal Parameters: Age 18 years and older BMI >= 18.5 and < 25 kg/m2
Provide Patient Access	98%	789
At least one patient seen by the MIPS eligible clinician during the performance period is provided timely access to view online, download, and transmit to a third party their health information subject to the MIPS eligible clinician's discretion to withhold certain information.
Secure Messaging	56%	789
For at least one unique patient seen by the MIPS eligible clinician during the performance period, a secure message was sent using the electronic messaging function of CEHRT to the patient (or the patient-authorized representative), or in response to a secure message sent by the patient (or the patient-authorized representative) during the performance period.
Security Risk Analysis	Yes	N/A
Conduct or review a security risk analysis in accordance with the requirements in 45 CFR 164.308(a)(1), including addressing the security (to include encryption) of ePHI data created or maintained by certified EHR technology in accordance with requirements in 45 CFR164.312(a)(2)(iv) and 45 CFR 164.306(d)(3), and implement security updates as necessary and correct identified security deficiencies as part of the MIPS eligible clinician's risk management process.

NPI NPI Number Validation

How NPI Validation Works

The NPI validation process uses the ISO-standard Luhn algorithm, a mathematical "handshake", to ensure that a provider's 10-digit ID is authentic and free of common typing errors.

To verify the NPI 1477805554, we treat the final digit (4) as the Check Digit—the target answer we need to reach. The process begins by taking the first nine digits and adding a constant value of 24, which accounts for the "80840" prefix required for all U.S. health identifiers. We then double every other digit starting from the right and sum the individual digits of those results together. For this specific NPI, that total comes to 56. The final step is to find the difference between that total and the next multiple of ten (60 - 56 = 4).

Digit-by-digit view

Use the first nine digits for the calculation. Starting from the right, double every other digit. The last digit is the check digit and is not part of the calculation.

Pos 1

Doubled → 2

Pos 2

Unchanged

Pos 3

Doubled → 14 → 1 + 4

Pos 4

Unchanged

Pos 5

Doubled → 16 → 1 + 6

Pos 6

Unchanged

Pos 7

Doubled → 10 → 1 + 0

Pos 8

Unchanged

Pos 9

Doubled → 10 → 1 + 0

Check

Target digit

Regular digit Doubled digit Check digit

Step 1: Double every other digit from the right

Starting with the rightmost digit of the first nine digits, double every other value. If doubling creates a two-digit number, add those digits together.

1 → 2 7 → 14 → 5 8 → 16 → 7 5 → 10 → 1 5 → 10 → 1

Step 2: Add all digits plus the NPI constant

Add the transformed values, the unchanged digits, and the constant 24.

2 + 4 + 1 + 4 + 7 + 1 + 6 + 0 + 1 + 0 + 5 + 1 + 0 + 24 = 56

Step 3: Find the amount needed to reach the next multiple of 10

The next multiple of ten after 56 is 60. The difference is the calculated check digit.

60 - 56 = 4

This NPI is valid

The calculated check digit is 4, which matches the last digit of 1477805554.

About TREVOR WILLIAMS

Location Map

Specialty - Primary Taxonomy

Physician Assistant

Medicare Participation & PECOS Enrollment Status

Is the provider registered in PECOS? Yes

PECOS PAC ID: 6103079082

PECOS Enrollment ID: I20121228000135

Accepts Medicare Assignment? Yes

Eligible to Order or Refer Part B Clinical Laboratory and Imaging: Yes

Eligible to Order or Refer Durable Medical Equipment (DMEPOS): Yes

Eligible to Order or Refer a Home Health Agency (HHA): Yes

Eligible to Order or Refer Power Mobility Devices: Yes

Provider Referred Orders for Durable Medical Equipment, Devices & Supplies

Durable Medical Equipment

Areas of Expertise

Administration of pneumococcal vaccine

Annual alcohol misuse screening, 15 minutes

Annual depression screening, 15 minutes

Annual wellness visit, includes a personalized prevention plan of service (pps), subsequent visit

Annual wellness visit; includes a personalized prevention plan of service (pps), initial visit

Aspiration and/or injection of fluid from large joint

Ct scan of heart with evaluation of blood vessel calcium

Established patient office or other outpatient visit, 20-29 minutes

Established patient office or other outpatient visit, 30-39 minutes

Initial preventive physical examination; face-to-face visit, services limited to new beneficiary during the first 12 months of medicare enrollment

Injection of drug or substance under skin or into muscle

Injection, ceftriaxone sodium, per 250 mg

Injection, ketorolac tromethamine, per 15 mg

Injection, triamcinolone acetonide, not otherwise specified, 10 mg

Injection, vitamin b-12 cyanocobalamin, up to 1000 mcg

Insertion of needle into vein for collection of blood sample

Pneumococcal vaccine, 23-valent

Removal of impacted ear wax by washing

Routine electrocardiogram (ecg) using at least 12 leads with interpretation and report

Smoking and tobacco use intensive counseling, 4-10 minutes

Telephone medical discussion with physician, 11-20 minutes

Telephone medical discussion with physician, 21-30 minutes

Telephone medical discussion with physician, 5-10 minutes

Urinalysis, manual test

Physician Visit Costs

New Patients Visit Costs *

Established Patients Visit Costs *

Overall MIPS Quality Performance

Final Score: 75 out of 100

Quality Score: N/A

Promoting Interoperability Score: N/A

Improvement Activities Score: N/A

Cost Score: N/A

Cost Score: N/A

Quality Reporting

Reviews for TREVOR D. WILLIAMS PA-C

NPI NPI Number Validation

How NPI Validation Works

Digit-by-digit view

Step 1: Double every other digit from the right

Step 2: Add all digits plus the NPI constant

Step 3: Find the amount needed to reach the next multiple of 10

Frequently Asked Questions

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