Skip to main content
U.S. flag

An official website of the United States government

Dot gov

The .gov means it's official.
Federal government websites often end in .gov or .mil. Before sharing sensitive information, make sure you're on a federal government site.


The site is secure.
The https:// ensures that you are connecting to the official website and that any information you provide is encrypted and transmitted securely.

CMS and Its Contractors Did Not Use Comprehensive Error Rate Testing Program Data To Identify and Focus on Error-Prone Providers

Why OIG Did This Audit

Public law requires the heads of Federal agencies to annually review programs that they administer to identify and develop actions to reduce improper payments.

The Centers for Medicare & Medicaid Services (CMS) administers the Comprehensive Error Rate Testing (CERT) program to measure improper Medicare fee-for-service payments to providers.

Previous OIG reports recommended using CERT data to identify and focus on providers that were prone to having errors.

Our objective was to determine whether CMS and its contractors used CERT program data to identify and focus on error-prone providers.

How OIG Did This Audit

We reviewed the steps CMS and its contractors took to reduce the improper payment rates for the reporting years 2014 through 2017, which included reviewing and analyzing the CERT program data to identify error-prone providers for fiscal years 2014 through 2017.

What OIG Found

CMS and its contractors did not use CERT data to identify and focus on error-prone providers for review and corrective action. Using CERT data, we identified 100 error-prone providers from 2014 through 2017. Of the $5.8 million reviewed by CERT, $3.5 million was incorrect, which is an improper payment rate of 60.7 percent. We determined that during the same period, Medicare made $19.1 billion in FFS payments to these 100 error-prone providers.

The term "error-prone provider" is an OIG-created term to refer to a list of providers identified as having higher rate of errors in the CERT sample data. When used to describe OIG analysis of CERT data from 2014 through 2017, the term refers to providers that had at least one error in each of the 4 CERT years analyzed, an error rate of higher than 25 percent in each of the 4 CERT years analyzed, and a total error amount of at least $2,500. An error-prone provider is statistically more likely to submit an improper claim than the average provider.

What OIG Recommends and Auditee Comments

We recommend that CMS: (1) review the list of 100 error-prone providers identified in this audit and take specific action as appropriate, such as prior authorization, prepayment reviews, and postpayment reviews, and (2) use annual CERT data to identify individual providers that have an increased risk of receiving improper payments and apply additional program integrity tools to these providers.

In written comments on our draft report, CMS did not concur with our recommendations. CMS disagreed with our methodology for identifying error-prone providers and suppliers. Additionally, CMS stated that it previously attempted to use CERT data to identify error-prone providers and suppliers but found that CERT data was ineffective for this purpose and discontinued the practice.

After reviewing CMS's comments, we maintain that our findings and recommendations remain valid. We maintain that CMS can improve its ability to detect these types of providers by using the provider-level CERT data along with its existing oversight efforts.

Filed under: Centers for Medicare and Medicaid Services