2024 Speakers | Kisaco Research

2024 Speakers

Healthcare Payment & Revenue Integrity Congress
10-11 September, 2025

MEET THE EXPERTS

  • Author:

    Darren Wethers

    Chief Medical Officer
    ATRIO Health Plans

    Darren Wethers is a board-certified internal medicine physician and certified physician executive.
    He graduated from Morehouse College, Northwestern University Medical School and completed internal medicine training at Emory University School of Medicine before establishing an internal medicine practice in the St. Louis, Missouri area, becoming a “Top Doctor” Honorée several years running. Dr. Wethers was the medical staff president at SSM St. Mary’s Health Center in 2006-07 and chaired the facility’s Credentials committee 2007-11.
    In 2011, Dr. Wethers began a career in administrative medicine, servings as a medical director with Coventry Health Care and Aetna, vice president of clinical operations at Blue Cross Blue Shield of Arizona and is now at Atrio Health Plans, where he serves as chief medical officer.
    Dr. Wethers is a member of the American Association for Physician Leadership, Fellow of the American College of Physicians, member of Alpha Phi Alpha and Sigma Pi Phi fraternities; he is a board member and immediate past chairman for Gamma Mu Educational Services (GMES) and is a board member of Northwestern University Medical School Alumni Association, for which he serves as president-elect and co-chair of the Inclusion and Allyship committee.

    Darren Wethers

    Chief Medical Officer
    ATRIO Health Plans

    Darren Wethers is a board-certified internal medicine physician and certified physician executive.
    He graduated from Morehouse College, Northwestern University Medical School and completed internal medicine training at Emory University School of Medicine before establishing an internal medicine practice in the St. Louis, Missouri area, becoming a “Top Doctor” Honorée several years running. Dr. Wethers was the medical staff president at SSM St. Mary’s Health Center in 2006-07 and chaired the facility’s Credentials committee 2007-11.
    In 2011, Dr. Wethers began a career in administrative medicine, servings as a medical director with Coventry Health Care and Aetna, vice president of clinical operations at Blue Cross Blue Shield of Arizona and is now at Atrio Health Plans, where he serves as chief medical officer.
    Dr. Wethers is a member of the American Association for Physician Leadership, Fellow of the American College of Physicians, member of Alpha Phi Alpha and Sigma Pi Phi fraternities; he is a board member and immediate past chairman for Gamma Mu Educational Services (GMES) and is a board member of Northwestern University Medical School Alumni Association, for which he serves as president-elect and co-chair of the Inclusion and Allyship committee.

  • Author:

    Jonique Dietzen

    Payment Integrity Director
    CareOregon

    With over 18 years of experience in healthcare billing and finance, I am a certified professional coder dedicated to ensuring accurate claims and proper reimbursement for providers. Having worked extensively on the provider side in finance and revenue cycle, I bring wealth of knowledge to the table, particularly in processing and payment integrity.
    Throughout my career, I have gained a comprehensive understanding of billing challenges from both perspectives. This unique insight drives my commitment to improving billing practices and advocating for provider education. I continue to leverage my expertise to enhance billing processes and support providers in navigating the complexities of healthcare finance.

    Jonique Dietzen

    Payment Integrity Director
    CareOregon

    With over 18 years of experience in healthcare billing and finance, I am a certified professional coder dedicated to ensuring accurate claims and proper reimbursement for providers. Having worked extensively on the provider side in finance and revenue cycle, I bring wealth of knowledge to the table, particularly in processing and payment integrity.
    Throughout my career, I have gained a comprehensive understanding of billing challenges from both perspectives. This unique insight drives my commitment to improving billing practices and advocating for provider education. I continue to leverage my expertise to enhance billing processes and support providers in navigating the complexities of healthcare finance.

  • Author:

    Helen Liu, Pharm.D.

    Health Plan Leader
    Independent

    Dr. Liu is the Vice President of Pharmacy Operations for the ATRIO Health Plans, where she manages and oversees all Part D-related operations. Dr Liu has an extensive background in clinical pharmacy, medication safety, managed care, and data outcome analysis. Before this role, she developed and implemented the inpatient Drug Use Management program at Kaiser Permanente.

    Helen Liu, Pharm.D.

    Health Plan Leader
    Independent

    Dr. Liu is the Vice President of Pharmacy Operations for the ATRIO Health Plans, where she manages and oversees all Part D-related operations. Dr Liu has an extensive background in clinical pharmacy, medication safety, managed care, and data outcome analysis. Before this role, she developed and implemented the inpatient Drug Use Management program at Kaiser Permanente.

  • Author:

    Josh Miller

    Director, Payment Integrity
    Prominence

    Josh Miller

    Director, Payment Integrity
    Prominence
  • Author:

    Michael Devine

    Director Special Investigations Unit
    L.A Care

    Michael Devine

    Director Special Investigations Unit
    L.A Care
  • Author:

    Stephanie Sjogren

    Director, Coding and Provider Reimbursement
    EmblemHealth/Connecticare

    Stephanie Sjogren is a director of coding and provider reimbursement, working with payment integrity to ensure proper claims adjudication and to prevent fraud, waste, and abuse. Prior to joining ConnectiCare/EmblemHealth, she performed provider audits and education at a women’s healthcare group. Sjogren has also worked with physicians and staff to integrate and use electronic health record systems effectively and to stay in compliance with the Centers for Medicare & Medicaid Services’ rules and regulations. Her areas of specialty are payment integrity, auditing, and clinical documentation improvement. 

    Stephanie Sjogren

    Director, Coding and Provider Reimbursement
    EmblemHealth/Connecticare

    Stephanie Sjogren is a director of coding and provider reimbursement, working with payment integrity to ensure proper claims adjudication and to prevent fraud, waste, and abuse. Prior to joining ConnectiCare/EmblemHealth, she performed provider audits and education at a women’s healthcare group. Sjogren has also worked with physicians and staff to integrate and use electronic health record systems effectively and to stay in compliance with the Centers for Medicare & Medicaid Services’ rules and regulations. Her areas of specialty are payment integrity, auditing, and clinical documentation improvement. 

  • Author:

    Erik Carter-Nadeau

    Operations Manager, Provider Network
    CareOregon

    With over a decade in healthcare leadership, I am passionate about fostering provider engagement and delivering strategic support to improve the health of Oregonians, particularly in rural and underserved areas. As a native Oregonian, growing up in these communities across my state has provided me with unique insights into the cultural and geographic factors that influence healthcare delivery. I am committed to leveraging this understanding to enhance quality, access, and equity in healthcare for all Oregonians.

    Erik Carter-Nadeau

    Operations Manager, Provider Network
    CareOregon

    With over a decade in healthcare leadership, I am passionate about fostering provider engagement and delivering strategic support to improve the health of Oregonians, particularly in rural and underserved areas. As a native Oregonian, growing up in these communities across my state has provided me with unique insights into the cultural and geographic factors that influence healthcare delivery. I am committed to leveraging this understanding to enhance quality, access, and equity in healthcare for all Oregonians.

  • Author:

    Eric Renteria

    Senior Fraud Investigator
    L.A. Care Health Plan

    Eric Renteria

    Senior Fraud Investigator
    L.A. Care Health Plan
  • Author:

    CJ Wolf

    Professor and Asst. Program Director
    Brigham Young University-Idaho

    CJ Wolf

    Professor and Asst. Program Director
    Brigham Young University-Idaho
  • Author:

    Jennifer Callahan

    COO
    ATRIO Health Plans

    Jen Callahan is the President and Chief Operating Officer of ATRIO Health Plans. For over 20 years, Jen has established herself as a trusted thought leader who helped shape the managed care industry with her innovative ideas and expertise. Jen has dedicated her career almost exclusively to Medicare Advantage and Medicare Supplement programs.

    Prior to joining ATRIO, she co-founded a field management organization, Keen Insurance Services, Inc. to create a provider-centric Medicare focused sales and distribution organization from the ground up. Prior to that, she held the position of Vice President, Medicare Product at Aetna, a CVS Health company where she oversaw the product development and implementation of Aetna’s entire Medicare portfolio supporting record breaking growth for the Medicare organization. Throughout her career, Jen has also held various leadership positions at Healthfirst and Elevance.

    Jen received her Bachelor of Science degree from Fordham University and MBA from North Carolina State University. Jen currently resides in Waxhaw, a suburb of Charlotte, North Carolina with her husband, their three kids, tuxedo cat, Vivi and golden retriever puppy, Steve.

    Jennifer Callahan

    COO
    ATRIO Health Plans

    Jen Callahan is the President and Chief Operating Officer of ATRIO Health Plans. For over 20 years, Jen has established herself as a trusted thought leader who helped shape the managed care industry with her innovative ideas and expertise. Jen has dedicated her career almost exclusively to Medicare Advantage and Medicare Supplement programs.

    Prior to joining ATRIO, she co-founded a field management organization, Keen Insurance Services, Inc. to create a provider-centric Medicare focused sales and distribution organization from the ground up. Prior to that, she held the position of Vice President, Medicare Product at Aetna, a CVS Health company where she oversaw the product development and implementation of Aetna’s entire Medicare portfolio supporting record breaking growth for the Medicare organization. Throughout her career, Jen has also held various leadership positions at Healthfirst and Elevance.

    Jen received her Bachelor of Science degree from Fordham University and MBA from North Carolina State University. Jen currently resides in Waxhaw, a suburb of Charlotte, North Carolina with her husband, their three kids, tuxedo cat, Vivi and golden retriever puppy, Steve.

  • Author:

    Zeeshan Syed

    Chief Executive Officer
    Health at Scale

    Zeeshan serves as Health at Scale’s CEO and was a Clinical Associate Professor at Stanford Medicine and an Associate Professor with Tenure in Computer Science at the University of Michigan. He was previously part of the early stage team that launched Google[X] Life Sciences (now Verily). Zeeshan is a recipient of multiple  awards including an NSF CAREER award and holds a PhD from MIT EECS and Harvard Medical School in Computer Science and Biomedical Engineering, and MEng and SB degrees in EECS from MIT.

    Zeeshan Syed

    Chief Executive Officer
    Health at Scale

    Zeeshan serves as Health at Scale’s CEO and was a Clinical Associate Professor at Stanford Medicine and an Associate Professor with Tenure in Computer Science at the University of Michigan. He was previously part of the early stage team that launched Google[X] Life Sciences (now Verily). Zeeshan is a recipient of multiple  awards including an NSF CAREER award and holds a PhD from MIT EECS and Harvard Medical School in Computer Science and Biomedical Engineering, and MEng and SB degrees in EECS from MIT.

  • Author:

    Richelle Marting, JD, MHSA,RHIA,CPC,CEMC,CPMA

    Director of Managed Care
    North Kansas City Hospital

    Richelle Marting, JD, MHSA,RHIA,CPC,CEMC,CPMA

    Director of Managed Care
    North Kansas City Hospital
  • Author:

    Joshua Preuss

    Special Agent at U.S. Department of Health & Human Services
    Office of Inspector General

    Joshua Preuss

    Special Agent at U.S. Department of Health & Human Services
    Office of Inspector General
  • Author:

    Angela Zigler

    Special Agent
    Food and Drug Administration Office of Criminal Investigation

    Angela Zigler

    Special Agent
    Food and Drug Administration Office of Criminal Investigation
  • Author:

    Dave Cardelle

    Chief Strategy Officer
    AMS

    Dave Cardelle

    Chief Strategy Officer
    AMS
  • Author:

    Prasanna Ganesan

    CEO
    Machinify

    Prasanna Ganesan

    CEO
    Machinify
  • Author:

    Brandon Shelton

    Senior Director, Advanced Analytics Lab
    L.A. Care

    Brandon Shelton is the Senior Director of the Advanced Analytics Lab at L.A. Care, the country's largest public-option health plan, where he leads teams of Data Scientists and Data Analysts to support the health plan's various enterprise domains with machine learning solutions, program impact assessments, and business intelligence deliverables. The team's contributions towards Payment Integrity savings consistently exceeds $20M per year.

    Brandon Shelton

    Senior Director, Advanced Analytics Lab
    L.A. Care

    Brandon Shelton is the Senior Director of the Advanced Analytics Lab at L.A. Care, the country's largest public-option health plan, where he leads teams of Data Scientists and Data Analysts to support the health plan's various enterprise domains with machine learning solutions, program impact assessments, and business intelligence deliverables. The team's contributions towards Payment Integrity savings consistently exceeds $20M per year.

  • Author:

    Dr. Michael Menen

    Chief Medical Officer
    MedReview
    •Former Chief Medical Officer at Optum
    •Bachelor of Science degree in theoretical mathematics from the University of California, Riverside
    •Doctor of Medicine degree from the Medical College of Wisconsin
    •Board-certified invasive cardiologist and a fellow of the American College of Cardiology

    Dr. Michael Menen

    Chief Medical Officer
    MedReview
    •Former Chief Medical Officer at Optum
    •Bachelor of Science degree in theoretical mathematics from the University of California, Riverside
    •Doctor of Medicine degree from the Medical College of Wisconsin
    •Board-certified invasive cardiologist and a fellow of the American College of Cardiology
  • Author:

    Kyle Pankey

    Sales & Growth Leader
    Carelon Subrogation

    Kyle Pankey has over two decades of experience working within the healthcare and payer operations, with over 10 years specifically tied in to the payment integrity space.   Kyle lives in Chattanooga, TN and has served as Carelon Subrogation’s growth leader since mid-2022.

    Kyle Pankey

    Sales & Growth Leader
    Carelon Subrogation

    Kyle Pankey has over two decades of experience working within the healthcare and payer operations, with over 10 years specifically tied in to the payment integrity space.   Kyle lives in Chattanooga, TN and has served as Carelon Subrogation’s growth leader since mid-2022.

  • Author:

    Aaron Browder

    President
    Carelon Subrogation

    Aaron Browder is Staff Vice President, Elevance Health and President, Carelon Subrogation, formerly Meridian Resource Company (Meridian), where he and his team are responsible for overseeing the successful implementation and execution of our clients’ end-to-end subrogation programs. With a nearly 20-year career in subrogation, Aaron possesses a deep knowledge of healthcare subrogation. He has held a wide range of management positions throughout his tenure at Meridian, most recently serving as Staff Vice President. Prior to joining Meridian, Aaron gained experience in the financial services and insurance industries with Arthur Andersen, LLP/KPMG, LLP, and Travelers Property Casualty.

    Aaron holds a Bachelor of Arts degree from Indiana University and a Master of Business Administration from Butler University. He served on the Board of Directors for the National Association of Subrogation Professionals and has been a national presenter and author on issues related to subrogation.

     

    Aaron Browder

    President
    Carelon Subrogation

    Aaron Browder is Staff Vice President, Elevance Health and President, Carelon Subrogation, formerly Meridian Resource Company (Meridian), where he and his team are responsible for overseeing the successful implementation and execution of our clients’ end-to-end subrogation programs. With a nearly 20-year career in subrogation, Aaron possesses a deep knowledge of healthcare subrogation. He has held a wide range of management positions throughout his tenure at Meridian, most recently serving as Staff Vice President. Prior to joining Meridian, Aaron gained experience in the financial services and insurance industries with Arthur Andersen, LLP/KPMG, LLP, and Travelers Property Casualty.

    Aaron holds a Bachelor of Arts degree from Indiana University and a Master of Business Administration from Butler University. He served on the Board of Directors for the National Association of Subrogation Professionals and has been a national presenter and author on issues related to subrogation.

     

  • Author:

    Matt Monyhan

    Executive Director, Operations and Strategy
    Carelon Subrogation

    Matt Monyhan

    Executive Director, Operations and Strategy
    Carelon Subrogation
  • Author:

    Creighton Long

    Staff VP, Commercial Aligned Incentives Solutions
    Anthem

    Creighton Long

    Staff VP, Commercial Aligned Incentives Solutions
    Anthem
  • Author:

    Karen Weintraub

    Executive Vice President
    HEALTHCARE FRAUD SHIELD

    With 25 years of data and 20 years of healthcare experience, Ms. Weintraub is currently responsible for the design and development of the company’s healthcare fraud detection software products and services. She provides subject matter expertise on system design and workflow, business rule development, data mining and fraud outlier algorithms as well as SIU policies and procedures. Prior to joining Healthcare Fraud Shield, managed SIUs on various healthcare investigations for all commercial, Medicaid and Medicare business and claims of fraudulent activity. Ms. Weintraub received a BA in Criminal Justice from the University of Delaware and an MA in Criminal Justice from Rutgers University. Ms. Weintraub is a Certified Professional Coder for Payers (CPC-P), a Certified Professional Medical Auditor (CPMA) from the American Academy of Professional Coders, a Certified Dental Coder (CDC) from the American Dental Association, and the founder of the Hamilton, NJ AAPC chapter. She is also an Accredited Healthcare Fraud Investigator (AHFI) from the National Healthcare Anti-Fraud Association (NHCAA). Ms. Weintraub Taught CPT Coding, Fraud & Audits, and Medical Billing, Laws and Ethics and the local community college. 

    Karen Weintraub

    Executive Vice President
    HEALTHCARE FRAUD SHIELD

    With 25 years of data and 20 years of healthcare experience, Ms. Weintraub is currently responsible for the design and development of the company’s healthcare fraud detection software products and services. She provides subject matter expertise on system design and workflow, business rule development, data mining and fraud outlier algorithms as well as SIU policies and procedures. Prior to joining Healthcare Fraud Shield, managed SIUs on various healthcare investigations for all commercial, Medicaid and Medicare business and claims of fraudulent activity. Ms. Weintraub received a BA in Criminal Justice from the University of Delaware and an MA in Criminal Justice from Rutgers University. Ms. Weintraub is a Certified Professional Coder for Payers (CPC-P), a Certified Professional Medical Auditor (CPMA) from the American Academy of Professional Coders, a Certified Dental Coder (CDC) from the American Dental Association, and the founder of the Hamilton, NJ AAPC chapter. She is also an Accredited Healthcare Fraud Investigator (AHFI) from the National Healthcare Anti-Fraud Association (NHCAA). Ms. Weintraub Taught CPT Coding, Fraud & Audits, and Medical Billing, Laws and Ethics and the local community college. 

  • Author:

    John-Michael Loke

    SVP, Health Plan Strategy & Partnerships
    AMS

    John-Michael Loke

    SVP, Health Plan Strategy & Partnerships
    AMS
  • Author:

    Clay Wilemon

    Chief Executive Officer
    4L Data Intelligence, Inc.

    Clay serves as CEO at 4L Data Intelligence™. He has launched over 500 new healthcare brands and holds patents in artificial intelligence and medical technologies. Clay is on the Board of Directors at Octane, a Southern California non-profit economic development organization that has helped hundreds of technology and med-tech companies get started. He a graduate of Vanderbilt University. 

    Clay Wilemon

    Chief Executive Officer
    4L Data Intelligence, Inc.

    Clay serves as CEO at 4L Data Intelligence™. He has launched over 500 new healthcare brands and holds patents in artificial intelligence and medical technologies. Clay is on the Board of Directors at Octane, a Southern California non-profit economic development organization that has helped hundreds of technology and med-tech companies get started. He a graduate of Vanderbilt University. 

  • Author:

    Greg Lyon

    Senior Fraud Advisor
    4L Data Intelligence, Inc.

    Greg is a recognized anti-fraud expert with experience in Financial Services and Healthcare Payments that includes serving as Director of Fraud Prevention at United Healthcare. His guiding principle is, “The best way to fight fraud is to prevent it.” Greg is a graduate of Colgate University and is a Certified Financial Planner.

    Greg Lyon

    Senior Fraud Advisor
    4L Data Intelligence, Inc.

    Greg is a recognized anti-fraud expert with experience in Financial Services and Healthcare Payments that includes serving as Director of Fraud Prevention at United Healthcare. His guiding principle is, “The best way to fight fraud is to prevent it.” Greg is a graduate of Colgate University and is a Certified Financial Planner.

  • Author:

    Matt Akromis

    Vice President of Sales
    AMPS - ClaimInsight

    Matt Akromis

    Vice President of Sales
    AMPS - ClaimInsight
  • Author:

    Mantha Subrahmanyam

    VP of Payment Integrity
    Sagility

    Mantha Subrahmanyam

    VP of Payment Integrity
    Sagility
  • Author:

    Bob Starman

    SVP of Payment Integrity Solutions
    Sagility

    Bob Starman

    SVP of Payment Integrity Solutions
    Sagility
  • Author:

    Michael Stahl

    Chiropractor
    Independent

    Michael Stahl

    Chiropractor
    Independent