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Our Leadership team has over 150 years of combined experience consisting of executive consultants, billing and credentialing specialists, and certified coders.  This team, in partnership with their staff, are dedicated to quality service delivery for our clients and helping you to maximize your revenue while insuring that patients remain our top priority.

Tammy Hinze
Chief Executive Officer and President

Tammy Hinze has 35+ years of healthcare management experience in the private sector.  She began her career in the Baylor College of Medicine system and advanced to the level of Director of Physician Practice.  Tammy then became the Director of Business Operations for a Texas based Management Services Organization (MSO) which, due in part to her leadership and expertise, grew from a local physician business organization to a national billing, human resources, and accounting services corporation operating in 6 states.  She had direct oversight and operational responsibility for 250+ physicians

and a billing support staff of over 80 employees. 


In 2008, Tammy jointly created Apex Practice Solutions, Inc., a Texas based MSO where she holds the position of President/CEO.   In conjunction with all operational activities for Apex, Tammy also performs consultative services to clients, including physician groups and hospital systems employing providers.  She has extensive experience working with Texas 501a not-for profit medical organizations as well as a strong background and knowledge regarding multiple PM/EMR systems.  She excels in organizational leadership, physician practice management, and physician office RCM services.  Tammy has delivered Practice Management and System Implementation Services to physician groups for a variety of specialties in multiple states, providing insight and direction for enhanced patient experience, improved process flow, and maximized reimbursement.


Tammy and her husband Ronnie have been married 43 years and have 4 grown children and 4 grandchildren.  When not working or playing with grandbabies, Tammy enjoys decorating and refinishing furniture, and appreciating the beauty of the Texas coast where she lives.


You can reach Tammy at


Michelle Service
Chief Operating Officer and Vice President of Operations

Michelle Service has 20+ years of healthcare management experience in the private sector. She began her career working for Blue Cross/Blue Shield entering and processing hospital and provider claims then moved to a leadership role in the customer service call department processing and adjudicating claims.  Michelle was then recruited to work as a billing supervisor for a Texas-based Management Services Organization (MSO) with oversight and operational responsibility for Medicare, Medicaid, and commercial claims for 100+ physicians and a billing support staff of 20 employees.


In 2008, Michelle jointly created a new MSO named Apex Practice Solutions, Inc., where she serves as Vice President of Operations/COO.  Michelle oversees all Revenue Cycle Management (RCM) as well as provides consultative services to clients including physician groups and hospital systems employing providers. She has extensive experience in the management of physician office billing/RCM along with broad knowledge of billing rules and policies in multiple states.  Additionally, Michelle is well versed in a number of PM/EMR systems and has provided training and support to front office staff as well as billing/RCM personnel.  She has delivered insight and direction to clinic practices, and medical facilities throughout multiple states while ensuring a high level of compliance and integrity in the billing process. Michelle obtained certification through AAPC in October 2019 as a Certified Professional Biller, adding to her expertise.

When not traveling Michelle enjoys spending family time with her husband of 24 years, Scott, and their 3 children.

Michelle can be reached at


Pam Clay
Revenue Cycle Manager
Kristie Taylor
Revenue Cycle Manager

Pam Clay has 18 years of experience in the medical field and over 20 years working in the financial/banking industry.  She started her medical career handling the collection activities and supervising the billing and front office staff for a Family Practice residency program.  In 2003, Pam accepted a position as the Business Office Manager for the central billing office of a Management Services Organization.  She had the responsibility of overseeing all facets of daily operations and maintaining acceptable AR results for multiple providers with multiple specialties located in both Texas and Arkansas. 


Pam joined Apex Practice Solutions, Inc. in 2010 as Accounts Receivable Manager, where she oversees Revenue Cycle Management (RCM) for a number of large Apex clients with multi-specialty providers.  She has many years of experience in a management capacity providing leadership, guidance, and support to physicians and their office staff.  Pam strives to facilitate teamwork relationships with Apex staff and clients to maintain integrity in the billing process, provide education on billing rules and policies, and maximize third-party reimbursement.

Robin Barnett
Credentialing Specialist

Robin Barnett is a Credentialing Specialist who partners with providers and hospital groups to perform Provider Enrollment in the chosen payor networks and government entities.  Robin came to Apex Practice Solutions, Inc. in 2017 with 8+ years of experience in the field of provider credentialing, and is well versed in the following areas:

  • Provider Enrollment

  • Medicare and Medicaid Credentialing and Revalidation

  • Provider Updates and Re-Enrollment

  • Maintaining and updating CAQH profile

  • NPI Registration

  • Completion of all necessary credentialing requirements for each payor and follow through to completion

  • Status Reporting so that our providers and clients know where we are in the process


Robin has excellent organizational and management skills and is consistently recognized by team members and clients as a valuable business resource.


Kristie Taylor has 23+ years of experience in the medical field, starting her healthcare career working in a clinical capacity as Medical Records Clerk, CNA, Medical Assistant and EMT duties.  In 2010, Kristie altered her career path by choosing to focus on the billing and collections of rendered healthcare services.  As her experience grew, Kristie advanced and served as a Team Lead in a Managed Service Organization billing environment, supporting and leading the billing for several multi-specialty clinics throughout the United States.  


Kristie joined Apex Practice Solutions, Inc. in August of 2015, where she serves as Revenue Cycle Supervisor over a team of specialists who resolve Accounts Receivable for multiple clients. Kristie obtained certification through AAPC in October 2019 as a Certified Professional Biller, adding to her expertise. Kristie has a broad knowledge of billing rules and policies throughout multiple states, and for a variety of healthcare specialties.  Her strengths include the development of strong client relationships, identifying trends that positively or negatively impact the bottom line, and establishing targets or goals to exceed accounts receivable industry standards.


Angel Callaway
Certified Professional Coder

Angel Callaway has been in the medical field for over 35 years.  She began her career as an LVN and worked in that capacity for 23 years before changing her profession to medical billing in 2010.  Angel

joined the billing team with Apex Practice Solutions, Inc. in 2013, utilizing her skills in Revenue Cycle Management to support multiple clients and a variety of specialties.  She earned her Certified

Professional Coder (CPC) certificate in November of 2014 and in October of 2019 obtained her Certified Professional Biller (CPB) certificate, as well as ICD-10 certified.


Angel has a passion for education and works with our clients and

staff to maximize reimbursement through accurate and compliant

coding based on documentation of rendered services. 

Angel has served as VP of the AAPC Chapter in Corpus Christi, TX, and helped establish the AAPC Chapter in Victoria, TX; serving as President and Secretary for this group.

Her combination of skillset in accounts receivable collections, billing, and coding certification has proven to be of great value to our teams and to the clients for whom she provides support. 


Linda Martin
Director of Human Resources

Linda Martin has 20+ years of experience in the medical field.  She started her medical career working as a biller in a Nephrologist's office. 

In 2005 Linda accepted a position with a large Texas-based

Management Service Organization (MSO) where she had direct supervision of 10 Billing Assistants who helped with the billing for

250+ physicians.  In 2010 Linda accepted a position with Apex

Practice Solutions as the Human Resources manager.  She has the responsibility for the on-boarding of new staff (interviews, background checks, sanction checks).  Linda is the Administrator of employee benefits, including the 401-K plan for 190+ staff members.  She

spends much of her time educating supervisors and managers in the handling of staff issues.


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