Our Team

Raja Chandra

Founder & President

Raja Chandra is the visionary Founder and President of Apple Billing and Credentialing, a trusted end-to-end Revenue Cycle Management (RCM) company based in Atlanta, GA. With over 20 years of experience in medical billing, credentialing, and healthcare operations, Raja is recognized as a driving force behind innovative, results-driven RCM strategies that help healthcare providers maximize reimbursements and reduce claim denials.

Armed with a Bachelor’s degree in Biomedical Engineering, Raja began his journey in healthcare in 2003. His passion for operational excellence and leadership has been further enhanced through prestigious certifications from Harvard Business School Online, including:

  1. Organizational Leadership
  2. Business Analytics
  3. Management Essentials
  4. Strategy Execution
  5. Negotiation Mastery
  6. Leadership Principles
  7. Business Rhetoric
  8. Fundamentals of Academic Writing

These qualifications, paired with two decades of practical experience, allow Raja to deliver real-world solutions that directly impact practice profitability and sustainability……Read More

Dr. Udaya Shivangi

Chief Executive Officer

Dr. Udaya Shivangi, a distinguished Sleep Medicine Specialist and healthcare leader, joined Apple Billing and Credentialing (ABC) in 2025 as its Chief Executive Officer. With her extensive medical expertise, strategic vision, and commitment to excellence, Dr. Shivangi plays a pivotal role in guiding providers to optimize billing operations, enhance revenue cycles, and improve patient engagement. As a Sleep Medicine Specialist: Dr. Shivangi brings deep clinical insights into sleep disorders and patient care. ●Leadership in Healthcare Organizations: As President of the American Association of Multi Ethnic Physicians (AAMEP) and a prominent figure in the American Association of Physicians of Indian Origin (AAPI), she has championed physician advocacy, diversity, and global health initiatives.

 

 

● Research & Grants: Her work includes groundbreaking studies on sleep apnea, insomnia, and geriatric health, supported by grants from institutions like Merck……..Read More

SSiva Thangaraj

The Compliance Officer

SSiva Thangaraj serves as the Compliance Officer at Apple Billing and Credentialing (ABC), bringing over 20 years of diverse IT expertise in supply chain, finance, and healthcare. Her career has been defined by precision, integrity, and innovation—qualities that shape ABC’s strong compliance framework.

Leadership at ABC

She ensures that all operations meet the highest industry standards, with strict adherence to HIPAA regulations and other federal and state requirements governing healthcare data privacy and security. SSiva plays a pivotal role in safeguarding sensitive health information while ensuring providers remain compliant and protected.

Educational Background and Expertise

SSiva holds an MBA from Emory University’s Goizueta Business School and a Juris Master’s degree from Emory Law School, specializing in business compliance and cybersecurity. This rare combination of business strategy and legal expertise allows her to bridge operational efficiency with regulatory rigor……Read More

Michael Williams

(Poisollamaiyan Subramanian)

Client Manager

With over a decade of experience in the medical billing industry, Poisollamaiyan—widely known in the professional world as Michael Williams—has earned a reputation for being one of the most dependable and effective billing leaders in the healthcare space. Since starting his career in 2012 as an AR caller, Michael has grown into a cornerstone of Apple Billing and Credentialing (ABC), where he now oversees operations as Billing Manager for over 80 active clients, maintaining an astonishing 110% client satisfaction rate. 

Tireless, Fast, and Always available

Clients often describe Michael as tireless, quick, and incredibly responsive. His ability to foresee problems before they arise and act proactively is one of his greatest strengths. Whether it’s resolving complex claim issues, streamlining billing workflows, or initiating urgent payer escalations, Michael gets it done—fast. 

Proven track record in medical billing & credentialing

Michael brings over 10 years of dedicated service at Apple Billing and Credentialing, where he has become a respected leader and strategic thinker in the healthcare revenue cycle.

Core Areas of Expertise:

  • Client Communication & Patient Engagement
  • Prompt Response to Client Queries
  • Effective Documentation of Team Meetings and Decisions
  • Insurance AR Follow-up & Denial Management
  • Statement Coordination & Payment Posting
  • Team Leadership & Process Optimization 

 

ABC’s 5-star Google reviews stand as a testimony to the results Michael has achieved for his clients—many of whom have stayed with ABC for the long term because of the trust and reliability he brings to the table…….Read More