The Board of Directors

Officers of the Cooperative Exchange

Board Chair

Pam Grosze,
PNC Bank

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Pam Grosze is Vice President and Senior Product Manager for PNC Bank’s Healthcare Division, which provides financial and revenue cycle management solutions for Health Plans, Third-Party Administrators, hospitals, healthcare providers, and other healthcare organizations.

Pam has spent more than 25 years in healthcare environments, developing, implementing and supporting healthcare EDI transactions for leading companies, including PNC Bank and RelayHealth.  She also takes a leading role in several major healthcare industry organizations, holding co-chair and board positions, helping to drive standards and regulations for healthcare.

Pam graduated with honors with a B.S. in Computer Science from the University of Tulsa in 1986, and worked as a software developer in a variety of industries, including an accounting department, a cable television station, a mental health agency, and a defense contractor, before beginning work in healthcare at then CIS Technologies.  Her career at CIS Technologies (which later became RelayHealth) advanced into a management role, where she had the opportunity to create new teams, build non-traditional teams, and manage existing teams as large as 40 people.  During her tenure at RelayHealth, Pam developed claim editing, remittance posting, and clearinghouse software, and managed teams focused on claims and ERA MIS, implementation, client support, clearinghouse processing, enrollments, payer relations, and healthcare regulations.

After 17 years at RelayHealth, Pam moved to PNC Bank to continue her work building teams to support various aspects of healthcare transaction processing. She created PNC’s Payer Services and Enrollment teams. She is now in Product Management, building healthcare products instead of teams, and is focused on PNC’s remittance advice products, while also maintaining the role of industry liaison for PNC.

Pam is actively involved in multiple healthcare industry committees, holding leadership roles in several.  She has been involved with ASC X12 since 2000 and is currently the co-chair of the Payments (835) workgroup.  Pam is very active with the Workgroup for Electronic Data Interchange (WEDI), and holds a Board Position there, along with being co-chair of the Data Exchange Workgroup and Remittance Advice and Payments Subworkgroup.  She is very active with CAQH CORE, and with The Cooperative Exchange as well, holding the position of X12 Liaison.

Past Board Chair

Crystal Ewing,

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Crystal Ewing is a Director of Product for Waystar. Crystal has over 20 years of experience in the healthcare industry leading high-profile industry initiatives such as 5010 and ICD-10. Her areas of expertise include healthcare management, product development, workflow efficiency, and profit improvement plans. She brings a blend of business and technical expertise to her current role where she focuses on simplifying and unifying revenue cycle solution development and compliance.

In addition to her role as Chair of the Cooperative Exchange, Crystal is also the chair of the Liaison Committee. She is an active member of the Workgroup for Electronic Data Interchange (WEDI) and former board member. She is an active member of X12 and former co-chair of the Entity workgroup. She is a certified medical coder through the American Academy of Professional Coders (AAPC), a Green Belt Six Sigma certified expert, a Microsoft Certified Application Developer and is a nationally recognized expert on HIPAA, HITECH, and the ACA.


Eric Grindstaff

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Eric Grindstaff served in various capacities in the healthcare industry for over 20 years. He is currently a senior business analyst and compliance analyst for Allscripts Payerpath clearinghouse where I have worked in EDI for the last 12 years monitoring federal and state legislation, regulation, and policy, including Medicare and Medicaid, and commercial insurance communication channels for changes impacting electronic healthcare clearinghouse, identifying scope and critical elements to guide development efforts.

In his capacity with Allscripts, he participated with the Cooperative Exchange, WEDI, CAQH CORE, and served as the chair and co-chair of the Transactions, Code Sets, and Identifiers Workgroup for the North Carolina Healthcare Information and Communications Alliance, Inc. from 2011 to 2020. Prior to working at Allscripts, Eric served as a Consumer Protection Specialist with the Managed Care Patient Assistance Program (MCPA) in the NC Department of Justice, a Senior Process Analyst with Mid Atlantic Medical Services Inc., and a High-Risk Intervention Mental Health Technician with the Homecare Management Corporation following graduation from the University of North Carolina at Chapel Hill with a Bachelor of Arts in Psychology.


Tina Greene
Mitchell / Enlyte

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Tina Greene is Senior Regulatory Affairs Consultant at Enlyte/Mitchell and has over 30 years of experience in the Property & Casualty, Workers’ Compensation industry. This prior experience includes 21 years with Florida’s Division of Workers’ Compensation, where she was involved in administrative rule writing, electronic data interchange (both medical and claims) and numerous other system program areas. Her current role provides guidance on national and state regulatory compliance for electronic data interchange standards which directly impact numerous products and processes.


Tina serves the industry in numerous leadership positions including national industry standard making organizations. She is Chair of the International Association of Industrial Accidents, Boards and Commissions (IAIABC) EDI Medical Committee (including eBill) as well as a member of the EDI Council. Working with the IAIABC for over 20 years has allowed invaluable relationships to form with many states. Additionally, she co-chairs the Workgroup for Electronic Data Interchange (WEDI) Property & Casualty eBill Subworkgroup. Other positions include P&C subject matter expert to X12; Secretary to the X12 Code Maintenance Group (Claim Adjustment Reason Codes). In addition to serving on the Board, Tina is also co-chair of the Cooperative Exchange Cybersecurity and Privacy Committee.


Jennifer Nereu
Jopari Solutions 

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Jennifer, SVP Strategic Partnership at Jopari Solutions, Inc, has spent the past 15 years in healthcare implementing and supporting electronic transactions. She is responsible for developing and sustaining strategic partner initiatives and ideas that accelerate each partners’ organizational growth and performance. As a member of the Business Development team, she is leading the expansion of strategic partnerships by influencing technology solutions that promote increased revenue and operational efficiencies.


Jennifer joined Jopari in 2007 after spending 6 years with P2P Link implementing and supporting both provider and payer clients.

Jennifer has over 20 years of experience in healthcare clearinghouse industry including property and casualty lines of business. She has led key roles with The Hartford Insurance Company as a WC Claims Supervisor and Corporate Trainer. Ms. Nereu began her career in the insurance industry as a Workers’ Compensation claims adjustor for The Travelers.


Dawn Duchek
Trizetto Provider Solutions,
A Cognizant Company

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Dawn Duchek serves as Market Intelligent Specialist for the Product Management Team at Trizetto Provider Solutions. Dawn is responsible for monitoring industry, regulatory and market research for TPS. Dawn joined the organization in 2000 and has 22 years of clearinghouse and RCM experience. She began in healthcare working in a physician practice where her responsibility included managing the office of an OBGYN and ENT practice.

Dawn is a member and contributor for a number of workgroups including the Workgroup for Electronic Data Interchange (WEDI), X12 Regulatory, CAQH CORE and the Cooperative Exchange. Dawn is currently the Cooperative Exchange liaison for WEDI.

In her spare time, she enjoys reading, walking and spending time with her family.


Rhonda Sapereira

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Rhonda is a Director of Strategic Product at Optum with over 25 years experience in the healthcare industry with the last 11 years focused on Product Management. She offers the unique ability to bring together both strategic business and technical expertise to solve customer and industry problems to include the migration to 5010, NPI and ICD-10. For the HRSA Uninsured Program on behalf of Optum, UnitedHealthcare and the Federal Government to administer claims payment for COVID Testing and Treatment of people without health insurance, Rhonda led the tactical execution of EDI Clearinghouse services for transaction intake with integrated transaction delivery to UHC for full roll-out from initial discussions to go-live in six weeks. Recognizing the strategic vision to accelerate interoperability, Rhonda was the driver for CAQH CORE Certification for both Optum and UHC with transition to consultative expert for subsequent certifications for the Enterprise. Rhonda has extensive expertise around the HIPAA Transactions and processing while keeping a thumb on emerging technologies. She is also a member of the Workgroup for Electronic Data Interchange (WEDI).