A comprehensive DRG audit evaluates more than whether an inpatient account was coded correctly. It should assess DRG assignment, code sequencing, documentation support, present-on-admission (POA) indicators, discharge disposition, and other coding and compliance considerations while identifying recurring trends, financial impact, education needs, and opportunities for improvement.
For healthcare leaders, that distinction matters.
An accuracy rate can provide an important measure of coding performance, but it does not necessarily explain why discrepancies are occurring, whether they represent isolated findings or broader patterns, or where an organization should focus next.
The real value of a DRG audit comes from connecting individual findings to the bigger picture.
What Is a DRG Audit?
A DRG audit is a retrospective review of inpatient medical records and associated coding to determine whether the documentation, diagnoses, procedures, sequencing, and other coded elements support the assigned diagnosis-related group.
DRG audits can help healthcare organizations independently validate coding accuracy, evaluate compliance with applicable coding guidance, identify documentation opportunities, and better understand the financial implications of coding changes.
But the audit itself is only one part of the process.
A comprehensive audit should also give HIM, coding, compliance, CDI, and revenue cycle leaders insight into what findings mean collectively and where improvement opportunities may exist.
What Should a Comprehensive DRG Audit Evaluate?
The exact scope of a DRG audit will depend on an organization’s objectives, risk areas, and audit methodology. However, a comprehensive inpatient review may evaluate several interconnected areas.
DRG Assignment and Code Sequencing
Auditors should evaluate whether the medical record supports the reported coding and resulting DRG, including:
- Principal diagnosis
- Secondary diagnoses
- ICD-10-CM code assignment and sequencing
- ICD-10-PCS procedure coding
- Procedure sequencing
- MS-DRG assignment
- Other relevant reimbursement considerations
Reviewing these components together helps determine whether the final coded record accurately represents the patient’s documented encounter.
Documentation Support
Accurate coding begins with the medical record.
An audit should evaluate whether reported diagnoses and procedures are sufficiently supported by provider documentation and identify areas where documentation may lack the specificity necessary for accurate code assignment.
Documentation findings may also reveal broader opportunities involving physician documentation, CDI workflows, or education.
POA Indicators and Discharge Disposition
Present-on-admission indicators and discharge disposition can affect both coding accuracy and reimbursement.
Including these elements within an inpatient audit provides a more complete assessment of the coded encounter and can help identify recurring issues that may otherwise be missed.
Physician Queries
Depending on the audit scope, reviews can also evaluate existing physician queries and identify potential missed query opportunities.
This creates an important connection between coding, CDI, documentation, and compliance rather than evaluating each function in isolation.
Managed Resources’ coding audit methodology similarly encompasses DRG validation, ICD-10-CM/PCS accuracy and sequencing, documentation support, POA indicators, discharge disposition, and related areas.
Looking for an independent perspective on coding performance?
Explore Managed Resources’ Medical Coding Audit services.
Why Is Coding Accuracy Only the Starting Point?
Suppose an inpatient audit finds a coding accuracy rate of 95%.
That number provides useful information, but it immediately creates another question:
What is happening within the remaining 5%?
If the discrepancies are unrelated and scattered across the sample, they may indicate isolated errors.
But what if many involve the same DRG? The same diagnosis? The same documentation issue? Or the same service line?
That changes the conversation.
A recurring finding could point toward:
- A coder education opportunity
- A documentation gap
- An inconsistent query practice
- A workflow issue
- A specialty-specific challenge
- A broader compliance risk
This is why effective audits should move beyond counting discrepancies and analyze frequency, concentration, patterns, and potential root causes.
The objective becomes not simply identifying what was incorrect, but understanding why it occurred and whether the same issue is likely to occur again.
How Can DRG Audits Identify Systemic Coding and Compliance Risk?
One finding tells you about one encounter.
Repeated findings can tell you about a process.
Consider a hypothetical example: an audit identifies an issue involving diagnosis sequencing. One occurrence may warrant correction and individual feedback. But if the same issue appears repeatedly across similar cases, it may indicate an education or workflow opportunity that deserves broader attention.
The same principle applies to:
- Diagnosis and procedure coding
- Documentation support
- POA assignment
- Discharge disposition
- Physician queries
- Particular DRGs or service lines
Trend analysis helps compliance and HIM leaders distinguish isolated findings from systemic patterns and prioritize resources accordingly.
This is also where audit data becomes particularly valuable. Instead of viewing hundreds of audited encounters independently, organizations can aggregate the findings and ask:
Where are discrepancies concentrated? Why are they occurring? What represents the greatest risk? What should we address first?
For organizations taking a broader look at compliance priorities, see How to Prioritize Compliance Gaps for Greater Revenue Integrity.
Why Should Every DRG Audit Finding Be Defensible?
An audit finding should not simply reflect an auditor’s opinion.
A defensible finding should clearly communicate: finding, rationale, authoritative guidance, impact.
That requires experienced auditors, a consistent methodology, appropriate supporting references, and internal quality controls.
Depending on the finding, supporting guidance may include resources from the Centers for Medicare & Medicaid Services, official ICD-10-CM/PCS coding guidelines, Coding Clinic, and other applicable authoritative sources.
Quality assurance is equally important.
A structured QA process helps promote consistency across auditors and cases, particularly when audits involve complex inpatient records. Managed Resources’ methodology includes internal QA, a minimum 95% audit accuracy standard, recognized coding guidance, and a structured rebuttal process before findings are finalized.
Why Does a Rebuttal Process Matter?
A structured rebuttal process gives the organization an opportunity to review preliminary findings, provide additional context, and challenge determinations when appropriate.
That transparency can strengthen the final audit results while creating another valuable benefit: education.
When coders and auditors can understand the rationale and authoritative support behind a determination, the conversation shifts from simply agreeing or disagreeing with a finding toward understanding how similar cases should be approached in the future.
What Should DRG Audit Reporting Include?
The audit report is where individual findings become organizational intelligence.
Effective reporting should serve multiple audiences rather than forcing everyone to work from the same encounter-level spreadsheet.
Encounter-Level Reporting: What Happened?
Detailed reporting should make each determination easy to understand and support.
Depending on scope, this can include:
- Original and recommended coding
- Audit finding
- Rationale
- Supporting reference
- DRG impact
- Financial or reimbursement impact
Operational Reporting: What Patterns Are Emerging?
Coding, HIM, CDI, and compliance leaders need visibility across the audited population.
Useful metrics may include:
- Coding accuracy
- DRG accuracy
- Finding categories
- Recurring coding trends
- POA and discharge disposition findings
- Documentation opportunities
- Root causes
- Financial impact
- Education opportunities
Executive Reporting: What Should We Prioritize?
Executive leadership generally does not need hundreds of encounter-level findings.
They need the story behind them.
Executive reporting should help answer:
- Where are the most significant risks?
- Which findings are recurring?
- What is driving them?
- What is the potential financial impact?
- Which issues warrant immediate attention?
- What opportunities exist for improvement?
Managed Resources structures its audit reporting across encounter-level findings, summary trends and executive-level reporting, including financial impact, root-cause analysis, risk identification, and prioritized recommendations.
What should a DRG audit report include?
A DRG audit report should provide encounter-level findings and rationale, coding and DRG accuracy metrics, financial impact, recurring trends, potential root causes, compliance risks, education opportunities, and prioritized recommendations.
How Can DRG Audit Findings Support Education?
An audit should not end when the final report is delivered.
Recurring findings can provide a roadmap for targeted education. For example, audit results may uncover opportunities for:
- Coder education
- Provider documentation education
- CDI education
- Query education
- Specialty-specific training
- Refresher education around recurring coding issues
This allows organizations to focus educational resources on observed needs rather than assumptions.
It also creates a feedback loop. Future audits can help determine whether education and process changes are producing the intended improvement.
Managed Resources supports organizations with coding and healthcare education programs designed around operational, compliance, and documentation needs.
How Should Healthcare Leaders Prioritize DRG Audit Findings?
Not every audit finding carries the same level of risk or urgency.
When reviewing results, healthcare leaders can consider five factors:
Frequency: How often is the issue occurring?
Compliance Risk: Could the finding create meaningful coding or regulatory exposure?
Financial Impact: Does the issue have a significant reimbursement effect?
Breadth: Is it isolated to one encounter or appearing across providers, coders, service lines, or DRGs?
Correctability: Is there a clear education, documentation, or workflow intervention that could reduce recurrence?
Looking at findings through these lenses can help organizations move from a long list of observations to a prioritized improvement strategy.
When Should a Health System Consider an Independent DRG Audit?
Independent DRG audits can support both routine compliance monitoring and targeted evaluations of higher-risk areas.
Organizations may consider an independent review when:
- Conducting periodic compliance monitoring
- Evaluating coding consistency
- Experiencing significant coding staff changes
- Introducing new coding or documentation workflows
- Implementing or changing EHR technology
- Seeing increased payer scrutiny or DRG downgrades
- Evaluating higher-risk service lines
- Identifying recurring documentation concerns
- Seeking independent validation of internal findings
- Assessing the effectiveness of prior education
An independent audit does not necessarily mean an organization expects to find a problem.
It can provide an objective benchmark, validate existing processes, and help leadership determine where additional attention may or may not be warranted.
What Does a High-Value DRG Audit Ultimately Deliver?
At the end of an effective DRG audit, healthcare leaders should be able to answer more than:
What is our accuracy rate?
They should understand:
- Are our DRGs and codes accurate?
- Does the documentation support the coding?
- Where are discrepancies concentrated?
- Are findings isolated or systemic?
- Why are recurring issues occurring?
- What are the compliance implications?
- What is the potential financial impact?
- Where is targeted education needed?
- What should we prioritize next?
The greatest value of a DRG audit is not simply identifying what happened on the records reviewed.
It is understanding what those findings reveal about the broader coding, documentation, and compliance environment, and using that intelligence to guide what happens next.
Frequently Asked Questions About DRG Audits
What is a DRG audit?
A DRG audit is a review of an inpatient medical record and associated coding to determine whether documentation, diagnoses, procedures, sequencing, and other relevant coding elements support the assigned diagnosis-related group.
What does a DRG audit evaluate?
A comprehensive DRG audit may evaluate principal and secondary diagnoses, procedures, ICD-10-CM/PCS coding and sequencing, documentation support, POA indicators, discharge disposition, physician queries, and DRG assignment.
Why are DRG audits important?
DRG audits can help healthcare organizations independently validate coding accuracy, identify compliance risks, uncover recurring issues, evaluate financial impact, and identify opportunities for education and process improvement.
What should be included in DRG audit reporting?
Reporting can include encounter-level findings and rationale, accuracy metrics, supporting guidance, financial impact, trends, root causes, compliance risks, and prioritized recommendations.
How often should hospitals conduct DRG audits?
Audit frequency should reflect the organization’s compliance program, risk profile, coding performance, service-line complexity, operational changes, and other identified areas of concern. There is not a single audit frequency appropriate for every organization.
Who should perform a DRG audit?
DRG audits should be performed by qualified professionals with relevant inpatient coding and auditing experience, appropriate credentials, and knowledge of current coding guidance and regulatory requirements.
Can DRG audits identify education opportunities?
Yes. Recurring audit findings can help organizations identify focused education opportunities for coders, CDI professionals, providers, and other stakeholders.
What is the difference between a DRG audit and a coding accuracy review?
A coding accuracy review may focus primarily on whether codes were correctly assigned. A broader DRG audit can also evaluate documentation support, DRG impact, recurring trends, compliance risk, financial implications, and potential root causes.
Go Beyond the Accuracy Rate
A comprehensive coding audit can reveal more than whether individual accounts were coded correctly. It can help uncover the patterns, risks, documentation opportunities, and education needs behind the numbers.
Managed Resources and CodingAID provide expert-led medical coding audit services supported by experienced, credentialed professionals, structured quality assurance, and actionable reporting designed to help healthcare organizations strengthen coding accuracy and compliance.
