Our team embodies our core values:

We are transparent, visible, and trusted with over 25 years of experience helping Independent Physicians, stay INDEPENDENT.

Our Valuable Team Members

Jeff Robertson, CMPE, FMC Chief Executive Officer

A passion for Healthcare is the best way to describe Jeff Robertson. He has a unique, varied, and extensive background in Healthcare that covers a wide array of experience encompassing 30 years. Jeff is board certified by the MGMA as a Medical Practice Executive (CMPE) and is certified in Financial Management (FMC) and is an active member of MGMA. Jeff is also an active member of the Healthcare Business Management Association (HBMA) and continues to keep his knowledge current and focused on future trends and initiatives and how they affect our clients and their Clinic. Jeff has been actively running the Revenue Cycle Management and Practice Management divisions since 1997. Jeff Robertson, CMPE, FMC  has spent over 25 years working with Independent Physician Clinics with a special focus on Medical Billing/Revenue Cycle Management, Healthcare IT, Clinical Workflow Analysis, and Medical Bookkeeping and Financials. His passion and love of teaching, consulting, and finding a better, more efficient way to build processes into a clinic has led to him being labeled the “Practice Fixer”.

To date, he has installed, configured,    trained, and consulted over 450 Independent Physician Clinics across the country and has learned valuable lessons from each of them to share with all of our future clients. He approaches all Independent Physicians as "partners" and not as clients. 

More about Jeff

Debbie Hernandez, CPC Chief Operating Officer/Certified Professional Coder

Debbie leads the Revenue Cycle Division at Nexsys and shares her knowledge and experience which she has accumulated over 12+ years managing the Revenue Cycle Division which includes, Policies and Procedures, KPIs, Maximum Efficiency, and pulling every dollar out of the work our Physician clients perform. She excels at managing our Client’s accounts and facilitating and supporting the Nexsys team to ensure all of our clients are given the dedication and detail that each account requires. Debbie has proven to have excellent communication skills with our clients. Debbie is also responsible for helping to formulate and prepare complex commission structures for some of our larger groups. She is a valuable part of the Nexsys leadership team.

Certified Professional Coder (CPC®) – American Academy of Professional Coders (AAPC)

ICD-10 Certification – American Academy of Professional Coders

Julius Cabacungan, MCSE, CCNA Chief Information Officer

Julius has been at the forefront of Healthcare IT  for more than 30 years. He utilizes his accumulated experience as Senior Systems and Network Administrator to quickly analyze the variety of IT, Data, and Security challenges to provide the most effective and efficient solutions. Since Julius joined Nexsys, he has integrated his vast IT knowledge with the understanding of Electronic Medical Records systems. This resulted in helping all Nexsys clients have operational integrity of their EMRs and information systems. Julius has a bachelor’s degree in Electronics Engineering and has MCSE (Microsoft) and CCNA (Cisco) certifications. He enjoys sports and loves playing tennis. He and his wife have two daughters.

Gelson Vieira Chief Financial Officer/Accountant

Gelson Vieira is a 25 plus year veteran in the area of finance, with 8 years of experience in external audit at Coopers & Lybrand. He also spent time with the internal auditing department in Europe and the Middle East during his years at AIG Insurance Company.  
Gelson has led the Practice Management Division for Nexsys for over 8 years and in that capacity has managed the Medical Bookkeeping and Financials for our client Medical Practices throughout the country.  Additionally, Gelson manages the Accounts Payables, Accounting, and Payroll, as well as the special reporting needs of our clients. He is an invaluable member of our team and to each of our clients who rely on his accuracy, integrity, and accountability. 

Kelly W., CPC Certified Coder, Medical Billing Account Manager

Kelly is an incredibly valuable member of our team. She leads the Nexsys Ortho/Spine team and provides 14 years of Coding and expertise with some of the busiest Ortho and Spine Surgeons in Southern California. She has a  proven ability to work with complex situations and provide a high level of attention to detail.  Her experience in various specialties’/positions along with her distinguished career in Coding surgeries and managing accounts, helps not only our Nexsys team but the clients she serves.

Certified Professional Coder (CPC®) – American Academy of Professional Coders (AAPC)

ICD-10 Certification – American Academy of Professional Coders

Alex L. Medical Billing Account Manager

Alex has been a vital team member and mentor for Nexsys since joining our team in 2016. Alex is a trusted source for taking care of all of our clients needs and reports. Alex plays a key role in providing analysis and data to help both Nexsys Management as well as our clients; to make informed decisions supported by Data and Metrics. Alex is supporting our clients with everything from Coding help, payer analysis as well as helping the patients that put their faith in our clients and who we are all here to support. Her positive attitude and tremendous knowledge is a big part of the Nexsys culture that we try to share with all of our clients.

Lorena N. Medical Billing Account Manager

Lorena  joined Nexsys Billing & Practice Management with experience in many different Physician specialties. For 15 years Lorena has worked in the field  and demonstrated her her work ethic, determination, and a great attitude. These skills and attributes have enabled her to excel and do an outstanding job with our clients. She is AAPC certified and a great teammate and a valuable resource for her clients.

Kim S. Medical Billing Account Manager

Kim has been a vital team member and mentor for Nexsys since joining our team in 2020. Kim has an incredible background in managing the accounts for our Physicians and brings over 10 years of Orthopedic and Neurology Billing and managing the some of our most important accounts. Kim plays a key role in providing analysis and data to help both Nexsys Management as well as our clients; to make informed decisions supported by Data and Metrics. Kim is supporting our clients with everything from Coding help, payer analysis and A/R optimization.   Her positive attitude and tremendous knowledge is a valuable  asset and integral part of the Nexsys culture that we share with all of our clients.

Adriana G. Medical Billing Account Manager
Adriana came to Nexsys after 6 years of practicing law and specializing in legal representation for clients in civil, employment disputes, debt collection and contractual law cases. Adriana prepared, reviewed and provided advice on various labor contracts, payment distribution agreements/ disagreements and business documents. Disillusioned with practicing law and making a move to Southern California, she made a career change and dove into Revenue Cycle Management and Medical Billing & Coding. She brings incredible management skills and strong determination to fight on behalf of our clients in getting their claims paid. She brings 10 years of Medical Billing and Account Management to our team and is a valuable teammate and advocate for our clients.
Jerson Flores, MCSE Healthcare IT Administrator

Jerson has been an IT System Administrator/Engineer for over 15 years. He has extensive experience as a Senior Technical Support Administrator and Network Engineer. He built valuable experience providing in-house, on-site and remote end-user technical support throughout his career. Jerson has also provided project management, server administration, deployment, and infrastructure support for medium-sized and enterprise businesses.

Jerson focuses his time on automation and customization of the EHR for improved workflow. Jerson holds a Bachelors Degree in Software Engineering and multiple Certifications, including MTA, MCSE, and CCA-V. He spends most of his free time with his two daughters or on his hobbies in his spare time.