Medicare MAC Audit

Strategic Legal Representation During Healthcare Audits

Lynette Byrd
Attorney Lynette Byrd
Healthcare Fraud Team Lead
Former Federal Prosecutor
Nick Oberheiden
Attorney Nick Oberheiden
Healthcare Fraud Team
Kevin M. Sheridan
Kevin M. Sheridan
Healthcare Fraud Team
Former FBI Special Agent
Wade McFaul
Wade McFaul
Healthcare Fraud Team
Former HHS-OIG Assistant Special Agent-in-Charge

Medicare Administrative Contractor (MAC) audits are invasive and time-consuming events that can lead to substantial financial liability for healthcare providers. Mistakes by auditors and healthcare provider personnel can lead to costly consequences. Therefore, providers need to take a comprehensive approach to defend against MAC audits with the goal of preventing further federal inquiry.

Medicare Administrative Contractors (MACs) are, “private healthcare insurer[s] that ha[ve] been awarded a geographic jurisdiction to process Medicare Part A and [B] medical claims or Durable Medical Equipment (DME) claims for Medicare Fee-For-Service (FFS) beneficiaries.” They play several roles within the Centers for Medicare and Medicaid Services’ (CMS) “fee-for-service” audit recovery program, one of which includes auditing Medicare Part A and B reimbursement claims, claims submitted by DME companies, and claims from home health and hospice service providers.

During an audit, MAC auditors will review a provider’s Medicare billing records, and they may request to speak with certain employees. Once they have reviewed the information solicited, they will issue a finding that either: (i) the provider’s billings are accurate, (ii) the provider has underbilled Medicare and is entitled to additional reimbursement, or (iii) the provider has overbilled Medicare and is liable for recoupments.

Most audit determinations fall into the third category. In many cases, a healthcare provider’s alleged recoupment liability will be substantial. Under the fee-for-service model, MACs and other CMS audit contractors have a financial incentive to recover recoupments, and data from recent years indicate that audit contractors seek to recoup far more than they determine needs to be reimbursed. While some providers undoubtedly make mistakes that result in overbillings (and cases of intentional Medicare fraud are the exception to the norm), in many cases, substantial demands for recoupment are the result of errors during the auditing process.

National Healthcare Fraud Defense Team for MAC Audits

Led by experienced healthcare fraud attorneys and former prosecutors with the U.S. Department of Justice (DOJ) and U.S. Attorney’s Office, Oberheiden, P.C. is a team of experienced defense lawyers who represent healthcare providers in MAC audits. Our firm has represented physicians, pharmacists, dentists, DME companies, hospitals, hospices, home healthcare providers, and other individuals and entities in audits and investigations across the country. With our experience in the Medicare system and our knowledge of the government’s healthcare fraud enforcement strategies, our goal is to provide cost-effective and experienced representation.

If you are facing a MAC audit, it is important that you seek legal representation as soon as possible. Early intervention is important, and our attorneys can take action quickly with the goal that you and your personnel are prepared to respond appropriately to the auditors’ requests for information.

MAC Audits: How We Can Help

MAC AuditsWe provide comprehensive legal representation for healthcare providers facing Medicare Administrative Contractor audits. From the moment you contact us, we will begin working closely with you and your team to execute a defense strategy with the goal to protect your legal rights and financial interest while satisfying your obligations during the audit process. We will take an active role in the audit in order to address any recoupment liability and secure additional reimbursement if you have underbilled Medicare. We will seek to prove your compliance in order to mitigate the risk of a follow-up federal investigation.

Our services for MAC audits include:

  • A free initial case assessment with members of our healthcare fraud defense team
  • Advice for responding to auditors and preserving records during the audit
  • Coaching and training for key personnel to prevent mistakes that could have costly consequences
  • Speaking with MAC auditors on your behalf in order to ensure consistent and defense-focused communications
  • Identifying errors and abuses of authority during the audit process
  • Challenging any assumptions of auditors, as well as any faulty methodologies and conclusions
  • Preserving issues for appeal in the event of an unfavorable audit determination

The Medicare billing regulations are extremely complex, and changes over time mean that providers, auditors, and attorneys must be constantly focused on remaining up-to-date in order to avoid falling behind. We know the law, and we can make sure that MAC auditors do not misapply it to your disadvantage.

Contact Oberheiden, P.C. online today.

Put our highly experienced team on your side

Dr. Nick Oberheiden
Dr. Nick Oberheiden



Lynette S. Byrd
Lynette S. Byrd

Former Assistant U.S. Attorney


Ellen Comley
Ellen Comley

Senior Counsel


Roger Bach
Roger Bach

Former Special Agent (OIG)

Steven Taylor
Steven Taylor

Healthcare Compliance Consultant

Susan Sage
Susan Sage

Healthcare Auditor

Identifying the Medicare Administrative Contractors (MACs)

As summarized on CMS’s website, an MAC is, “a private healthcare insurer that has been awarded a geographic jurisdiction to process Medicare Part A and Part B (A/B) medical claims or Durable Medical Equipment (DME) claims for Medicare Fee-For-Service (FFS) beneficiaries.” MACs work with CMS on a contract basis. Currently, the federal MAC contracts are awarded to the following entities:

MACs with Jurisdiction over DME, Orthotics and Prosthetics Companies

  • CGS Administrators, LLC – Alabama, Arkansas, Colorado, Florida, Georgia, Illinois, Indiana, Kentucky, Louisiana, Michigan, Minnesota, Mississippi, New Mexico, North Carolina, Ohio, Oklahoma, South Carolina, Tennessee, Texas, Virginia, West Virginia, Wisconsin
  • Noridian Healthcare Solutions, LLC – Alaska, Arizona, California, Connecticut, Delaware, District of Columbia, Hawaii, Idaho, Iowa, Kansas, Maine, Maryland, Massachusetts, Missouri, Montana, Nebraska, Nevada, New Hampshire, New Jersey, New York, North Dakota, Oregon, Pennsylvania, Rhode Island, South Dakota, Utah, Vermont, Washington, Wyoming

MACs with Jurisdiction Over Home Health and Hospice Providers

  • CGS Administrators, LLC – Delaware, District of Columbia, Colorado, Iowa, Kansas, Maryland, Missouri, Montana, Nebraska, North Dakota, Pennsylvania, South Dakota, Utah, Virginia, West Virginia, Wyoming
  • National Government Services, Inc. – Alaska, Arizona, California, Connecticut, Hawaii, Idaho, Maine, Massachusetts, Michigan, Minnesota, New Hampshire, Nevada, New Jersey, New York, Oregon, Rhode Island, Vermont
  • Palmetto GBA, LLC – Alabama, Arkansas, Florida, Georgia, Illinois, Indiana, Kentucky, Louisiana, Mississippi, New Mexico, North Carolina, Ohio, Oklahoma, South Carolina, Tennessee, Texas

MACS with Jurisdiction Over all Other Medicare Part A and B Providers

  • Cahaba Government Benefit Administrators, LLC – Alabama, Georgia, Tennessee
  • CGS Administrators, LLC – Kentucky, Ohio
  • First Coast Service Options, Inc. – Florida
  • National Government Services, Inc. – Connecticut, Illinois, Minnesota, New York, Maine, Massachusetts, New Hampshire, Rhode Island, Vermont, Wisconsin
  • Noridian Healthcare Solutions, LLC – Alaska, Arizona, California, Hawaii, Idaho, Montana, Nevada, North Dakota, Oregon, South Dakota, Utah, Washington, Wyoming
  • Novitas Solutions, Inc. – Arkansas, Colorado, Delaware, District of Columbia, Maryland, New Jersey, New Mexico, Oklahoma, Pennsylvania, Texas, Louisiana, Mississippi
  • Palmetto GBA, LLC – North Carolina, South Carolina, Virginia, West Virginia
  • Wisconsin Physicians Service Insurance Corporation – Indiana, Iowa, Kansas, Michigan, Missouri, Nebraska

MAC Audits: Answers to Frequently-Asked Questions

Q: Which entities are Medicare Administrative Contractors (MACs)?


Since Medicare Administrative Contractors are private companies with government contracts, the list of MACs is subject to change over time. CMS maintains an updated set of MAC resources on its site: Who are the MACs?

As of 2016, the Medicare Administrative Contractors are:

  • CGS Administrators, LLC – Medicare Part A and B, DME, home health and hospice (HHH) providers
  • Noridian Healthcare Solutions, LLC – Medicare Part A and B, DME
  • National Government Services, Inc.Medicare Part A and B, HHH
  • Palmetto GBA, LLC – Medicare Part A and B, HHH
  • Cahaba Government Benefit Administrators, LLC – Medicare Part A and B
  • First Coast Service Options, Inc.Medicare Part A and B
  • Novitas Solutions, Inc. – Medicare Part A and B
  • Wisconsin Physicians Service Insurance Corporation – Medicare Part A and B

Each MAC is assigned to a geographic region, and the MACs that audit DME and HHH companies may have different jurisdictions for auditing different types of providers.

Q: What are some critical steps to take after being contacted by a Medicare Administrative Contractor?


Once you have been notified that your business or practice is being audited by a MAC, there are several steps that you should begin taking immediately in order to reduce the risk of an unfavorable determination and allegations of fraud that could lead to a federal investigation. Once you engage our firm, we will help you execute preventive measures including:

  • Conducting an internal assessment to gauge what MAC auditors might find (if anything)
  • Proactively addressing any issues identified during the initial assessment
  • Establishing communication protocols to avoid miscommunications and unintended messaging
  • Implementing an appropriate legal hold
  • Self-reporting any overpayments to CMS if and to the extent legally required, or in your best interests
  • Intervening in the audit promptly
  • Preparing to challenge auditors’ faulty methodologies and conclusions with documentary evidence and citations to the applicable Medicare billing regulations

Q: How common are mistakes during MAC audits?


Mistakes during MAC audits happen. Whether due to a lack of understanding of the Medicare rules and regulations that apply, misapplication of the relevant rules and regulations, a mistaken understanding of auditing procedures and methodologies, or an overzealous attempt to uncover overbillings in order to recover contingency fees from CMS – MAC auditors make mistakes that can lead to significant consequences for healthcare providers. At Oberheiden, P.C., we know the types of mistakes auditors tend to make, and our goal is to spot these mistakes quickly and before they lead to unfavorable audit determinations.

Q: What happens if the MAC determines that my business or practice is liable for recoupments?


If the MAC determines that your business or practice is liable for recoupments, you will be required to pay the amount that was allegedly overpaid, and you could be held liable for penalties and interest as well. The MAC may seek to implement overpayment prevention methods as well – such as denial of pending claims and prepayment review of future Medicare billings. If there is sufficient evidence of fraud, the MAC may refer your case to CMS, the DOJ, the Office of Inspector General (OIG), or another federal law enforcement agency for investigation and prosecution. This could lead to civil or criminal penalties (including fines and possible prison time) under the False Claims Act, the Anti-Kickback Statute, and a variety of other federal laws.

However, once you receive an unfavorable audit determination, you have the right to file an appeal. If the MAC is suggesting that your business or practice has committed Medicare fraud, this may very well be your best (and perhaps only) option for avoiding the consequences we just mentioned. The audit appeals process can be lengthy and time-consuming, and you will need to get started with your appeal quickly in order to address immediate recoupment liability.

Q: What types of billing mistakes can lead to recoupment liability in a MAC audit?


In a MAC audit, the auditors will be looking for any type of billing error that has resulted in an overpayment from CMS. While certain issues (such as missing dates and other technical deficiencies) fall outside of MACs’ scope of authority for demanding recoupment, generally speaking, any mistake that resulted in an overpayment is potential grounds for a MAC to seek recoupment.

The key term here is “mistake.” An overbilling does not have to be intentional in order to be subject to recoupment, and we have found that most overbillings are the result of simple human error and oversight. If someone within your business or practice has made a mistake that resulted in improper reimbursement requests being submitted to Medicare, we can deal with the issue proactively and with the goal that you not be unfairly penalized for an honest mistake.

MAC Audits: Why Choose Oberheiden, P.C.?

With prior government and private practice experience, the healthcare fraud defense team at Oberheiden, P.C. represents medical practitioners, executives, hospitals, and other individuals and entities across the country. Our attorneys have extensive experience in Medicare audits and investigations. Our goal in representing your interests starts with a comprehensive and hands-on approach to providing strategic legal defense.

In today’s world, healthcare providers that bill Medicare are under constant scrutiny. In order to remain compliant and avoid liability, they must have their finger on the pulse of the constantly-evolving federal healthcare system and the federal government’s shifting priorities for healthcare fraud enforcement. At Oberheiden, P.C., we take on this role for our clients. Our attorneys have significant knowledge of the federal healthcare system which they use with the goal being to protecting our clients against business and practice-threatening liabilities.

When you choose Oberheiden, P.C. for your MAC audit:

  • You will work directly with our senior attorneys throughout your audit and any ensuing appeals or federal litigation.
  • We will develop a custom-tailored defense strategy focused on the unique circumstances involved in your MAC audit.
  • We will arm you with information so that you know how to deal with auditors and you can feel confident making decisions as you continue to run your business or practice.
  • We will use our experience and resources to challenge auditors’ assumptions, methodologies, and conclusions.
  • We will have one goal, to handle your audit with a commitment to securing the best possible result and as efficiently as possible.

Please Contact Oberheiden P.C.’s Trusted Attorneys Early in the MAC Audit Process

If you are facing a MAC audit, we encourage you to contact us promptly so that we can schedule your initial case assessment and intervene in the audit as soon as possible. We represent healthcare providers across the nation, and we are available when and where our clients need us. To get started today, call our offices at 888-680-1745, or submit our online case assessment form now.

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