2026 Guide to Healthcare Auditing and Auditing Services Blog Post

2026 Guide to Healthcare Auditing and Auditing Services Blog Post

Author Jacob Yates at Healthcare Compliance Pros

Auditing and audit services has become a core part of how healthcare providers manage both compliance risk and revenue integrity in 2026. Regulators such as the Office of Inspector General (OIG) and the Centers for Medicare and Medicaid Services (CMS) make it clear that risk assessments, auditing, and monitoring are fundamental elements of an effective compliance program[1]. Furthermore, many improper payments in federal programs stem from documentation and billing errors rather than deliberate fraud. For healthcare administrators, compliance officers, practice managers, and revenue cycle leaders, understanding the importance of regular auditing and auditing services is essential to protecting an organization and optimizing its financial performance.

In this blog article, I'll explain what healthcare auditing and auditing services are, which types of audits matter most, what common errors audits uncover, how audits connect to compliance and revenue cycle results, how to choose an audit vendor, and how Healthcare Compliance Pros can add value as a compliance‑first organization.

The TL; DR Version: As Benjamin Franklin said, "An ounce of prevention is worth a pound of cure."

Auditing Services in 2026: What Providers Need to Know

Auditing services are structured, professional reviews of clinical documentation, coding, billing, and related processes to determine whether they meet regulatory and payer requirements. The OIG's General Compliance Program Guidance (GCPG)1 describes "risk assessment, auditing and monitoring" as one of the seven elements of an effective healthcare compliance program and explains that audits should be based on risks identified through formal risk assessments. The CMS's review programs similarly rely on collection and clinical review of medical records and related information to ensure that Medicare and Medicaid payments are made only for services that are reasonable, necessary, covered, and correctly documented.

In practice, auditing services can include reviews of evaluation and management (E&M) coding, ICD‑10 diagnosis coding, procedure coding, documentation quality, medical necessity support, and claims submission practices. They can also focus on compliance—for example, making sure documentation supports billed services and meets HIPAA and CMS expectations—or focused on revenue, such as identifying patterns of under coding, over coding, or claim denials that cause avoidable financial loss or inappropriate financial gain.

Audits are critical for multiple reasons.

First, enforcement and oversight are becoming more focused and frequent. The OIG's updated guidance underscores the importance of risk‑based auditing and monitoring, while its reports on HIPAA oversight urge the Office of Civil Rights (OCR) to expand audit scope to better evaluate physical and technical safeguards under the Security Rule.

Second, the CMS continues to measure and address improper payments[2], repeatedly pointing out that most improper payments are caused by inadequate or missing documentation rather than fraud. However, that is not to say that fraud does not exist and that some providers are intentionally trying to get more funds from the CMS. Just by subscribing to healthcare news, we can see that fraud is still a significant problem in healthcare today.

Third, the HIPAA Security Rule Notice of Proposed Rule Making[3] signals more prescriptive expectations for documentation, risk analysis, and cybersecurity protections around electronic protected health information. Organizations that incorporate regular audit services into their operations better position themselves to adapt to these trends and to show regulators, payers, and business partners that they are managing both compliance and revenue risks proactively.

What Are Audits and Auditing Services?

Healthcare audits and auditing services encompass a range of activities aimed at evaluating and improving how an organization documents, codes, and bills patient care, as well as how it adheres to key regulations. In the compliance program context, the OIG explains that audits are conducted based on the risks identified by risk assessments and that they help organizations determine whether policies and procedures are being followed and whether claims and practices meet applicable requirements. The CMS describes medical review audits as involving the collection and clinical review of medical records and related information to ensure that payment is made only for services that meet coverage, coding, and documentation standards.[4]

The scope of audits and auditing services typically includes coding accuracy, documentation completeness, support for medical necessity, adherence to payer rules, and compliance with federal standards such as HIPAA and the CMS program requirements.[5] For HIPAA, audits ordered or conducted by the OCR evaluate whether an organization complies with the Privacy and Security Rules by reviewing policies, procedures, records, and controls related to protected health information (PHI). For Medicare and Medicaid, the CMS and its contractors review claims and records to detect improper payments and educate providers on how to correct errors. Internal auditing is a vital proactive step healthcare organizations can take to reduce their risk of overpayments instead of putting themselves on the CMS' auditing list.

Audits matter in 2026 because they help organizations bridge the gap between written policies and day‑to‑day practice. A compliance program can look robust on paper, but if audits consistently show documentation gaps, coding errors, or unaddressed risk areas, regulators may question its effectiveness. Conversely, organizations that conduct regular, targeted audits and act on their findings demonstrate that they are actively managing their compliance and financial obligations.

Types of Healthcare Audits Explained

The OIG and the CMS may not use the exact labels business associates and vendors use, but their guidance supports four distinct approaches to auditing:

· Prospective audits

· Retrospective audits

· Risk‑based audits

· Focused audits

These four audit categories are grounded in how regulators expect programs to operate.

Prospective audits review documentation and coding before claims are submitted. Although the CMS's medical review programs often operate retrospectively, organizations can use the same principles prospectively to catch errors early. A prospective E&M or ICD‑10 audit might examine records and proposed codes to ensure that documentation supports medical necessity and coding rules before billing occurs. This type of audit supports both compliance and revenue by preventing improper payments and avoiding denials caused by missing or inconsistent information.5

Retrospective audits examine claims already submitted and paid or denied. The CMS's improper payment measurement activities and medical review programs are mostly retrospective, analyzing past claims to identify patterns of documentation errors, coverage issues, and coding mistakes. Organizations can mirror this approach by sampling past claims in high‑risk areas, such as certain E&M levels, chronic care management codes, or high‑cost procedures, to determine whether documentation and coding were correct. Retrospective audits help identify overpayments that may need to be refunded and underpayments which can be corrected, as well as areas where staff need additional training.

Risk‑based audits involve selecting audit targets based on a formal risk assessment rather than simple rotation or random sampling. The OIG's GCPG guidance emphasizes that risk assessments provide the process for identifying, analyzing, and responding to risks. As a result, audits should be conducted based on risks identified by those assessments. A risk‑based audit plan might prioritize service lines with high denial rates, coding categories with known complexity, or areas flagged by internal or external reviews, payer notices, or regulatory changes. This approach aligns with the OIG's expectation that auditing and monitoring should be tailored to the organization's risk profile rather than applied generically without regard to risk.

Focused audits or specialty audits concentrate on specific topics, such as E&M services, ICD‑10 diagnosis coding, particular specialties (e.g., cardiology, orthopedics), or specific payer contracts. The CMS's medical review guidance recognizes that different services and specialties pose different compliance risks, and the OIG's guidance suggests that organizations should consider medical necessity, documentation, and coding rules in any claim reviews and audits. A focus audit allows deeper examination of one area, which can be particularly valuable when external data (such as the CMS improper payment statistics[6] or contractor review results) indicate that a particular type of service has a high error rate.

Organizations should use each type at different times. Prospective audits are useful when launching new services or coding patterns. Retrospective audits work well for ongoing monitoring and correction. Risk‑based audits ensure resources are directed to the areas of greatest exposure and potential for a CMS or payer audit. Focused and specialty audits provide depth where issues are already identified or where rules are particularly complex.

Top Audit Findings and Common Errors

The CMS's improper payment fact sheets6 make it clear that most improper payments are typically not caused by intentional fraud, but rather by errors such as missing or inadequate documentation, incorrect coding, and failures to meet coverage or eligibility requirements. The OIG's compliance guidance1 likewise emphasizes audits and investigations should consider root causes and organizations should adjust policies and training when systematic issues are found.

Common billing and documentation errors that audits uncover include incorrect E&M levels, discrepancies between clinical documentation and billed codes, missing signatures or dates, lack of clear medical necessity support, and miscoded diagnoses or procedures. When medical record reviewers cannot determine whether a service was reasonable and necessary under the CMS program rules, the payment may be classified as improper even if the patient was eligible and the service was appropriate. This often occurs because information required for payment is missing or incomplete, not because of deliberate misconduct.

Upcoding and under coding remain persistent issues. Upcoding—where the level of service billed exceeds the complexity documented—can lead to overpayments and potential enforcement risk if patterns suggest systemic issues. Under coding—where providers bill less than documentation supports—usually produces underpayments and lost revenue. Both internal and external audits will help reveal both patterns, enabling organizations to correct errors, refund overpayments when necessary, and retrain staff to code accurately. After all, who would want to be unpaid for doing more work!

Documentation gaps are another major finding. The CMS notes that most improper payments are due to instances where required information is missing, or where documentation, eligibility determination, or enrollment was handled correctly is absent. In the clinical arena, this can include missing progress notes, incomplete diagnostic information, or absence of test results that support a billed service. HIPAA audits and the OCR enforcement actions similarly highlight documentation issues around privacy and security policies, risk analyses, and incident responses. Organizations that conduct regular audits and address documentation gaps are best positioned to withstand both payer reviews and regulatory audits.

Compliance, ROI, and Revenue: Real Impact of Effective Audits

Effective audits affect compliance and revenue in multiple ways. The OIG's guidance1 makes it clear that risk assessments, auditing, and monitoring help organizations detect improper conduct, determine its scope, and implement corrective actions. The CMS's medical review and improper payment measurement programs show that documentation and coding errors directly affect payment accuracy. When organizations work with professional audit services—and act on their findings—they can reduce improper payments, improve documentation, and strengthen their compliance posture.

From a regulatory standpoint, routine audits demonstrate an organization is performing internal monitoring and auditing as the OIG recommends. This matters when regulators or payers evaluate the effectiveness of a compliance program. A program that includes risk‑based audits, documented findings, and corrective actions looks more credible than one that relies solely on policies and one‑off training.

Financially, audits support revenue cycle optimization by identifying both overpayments and underpayments. Overpayments resulting from errors such as upcoding or overbilling need to be refunded to avoid potential penalties or corporate integrity agreements (CIAs). Underpayments due to under coding represent lost revenue which can be recovered through corrected claims or improved documentation practices. However, there are limitations on when and how these claim corrections are applicable. The CMS's fact sheets2 emphasize that improper payment estimates are not measures of fraud and that most errors are fixable once identified. This means that effective audits can have a positive return on investment by reducing both financial risk and missed legitimate revenue.

Consider a scenario drawn from these principles: A multi‑specialty clinic conducts a risk assessment and identifies its highest‑risk areas as E&M coding in internal medicine, ICD‑10 diagnosis coding in cardiology, and outpatient procedure billing in orthopedics. It engages an external auditing vendor to review a targeted sample of claims from each area. The audits reveal that internal medicine physicians often under code E&M levels despite thorough documentation. Cardiology documentation sometimes lacks clear links between diagnoses and procedures. And orthopedic records occasionally lack signatures or time stamps required by payer rules.

Based on these findings, the clinic retrains its physicians and coders, updates documentation templates to capture required elements more clearly, and implements periodic follow‑up audits. Over the next year, the organization sees fewer denials for documentation issues, more accurate billing, and more consistent support for medical necessity. The audit vendor helps the clinic refine its risk assessment and monitoring plans, aligning them with the OIG's expectations for ongoing auditing and corrective action. The result: better compliance and more stable revenue. This example illustrates how regular auditing and auditing services contribute directly to both regulatory readiness and financial health.

How to Choose An Auditing Partner

Choosing an auditing partner involves both regulatory and practical considerations. The OIG's guidance1 underscores the importance of compliance officers and committees having sufficient authority and resources to oversee auditing and monitoring. It also stresses that audits should be thorough, ongoing, and tied to risk assessments. An auditing partner should help an organization design and execute risk‑based audits, interpret findings through the context of HIPAA, the CMS, and the OIG expectations, and support corrective actions.

Credentialed professionals and regulatory expertise matter because auditing services are closely tied to federal regulations and payer rules. A strong auditing partner should be deeply familiar with the HIPAA Privacy and Security Rules, CMS documentation and coverage requirements, and the OIG's compliance program framework. A reputable vendor will use those sources as the basis for their methods rather than relying on generic coding checklists or AI input alone.

Technology‑enabled auditing is increasingly important. The CMS's medical review programs and the OIG's recommendations emphasize the need for better data, expanded audit scope, and defined metrics to evaluate the impact of audits on cybersecurity and payment integrity. Auditing partners that leverage technology to analyze claims patterns, detect anomalies, and correlate documentation issues with denial rates can provide more precise and actionable insights for your organization.

Geography and regulatory focus also matter. Offshore providers may be able to offer lower costs, but they can be less familiar with U.S. regulatory nuances or less able to assist with on‑site education and follow‑up. The OIG's guidance, the CMS's programs, and the OCR's enforcement work all operate within the U.S. regulatory framework, and it is vital for healthcare organizations to make sure their audit methodologies reflect that reality. Healthcare Compliance Pros differentiates itself by focusing on healthcare compliance, aligning its audit processes with the OCR, the CMS, and the OIG expectations—emphasizing a compliance‑first approach that considers both documentation and regulatory risk.

Frequently Asked Questions about Auditing and Audit Services in 2026

How often should I conduct audits?
The OIG does not set a fixed schedule, but its guidance indicates that auditing and monitoring should be ongoing, thorough, and based on risk assessments. The CMS guidance suggests that Medicare Advantage plans and other entities should independently audit compliance program effectiveness at least annually, while regular claim review and medical review activities continue throughout the year. In practice, many organizations conduct formal audits in high‑risk areas at least once per year and use more frequent, smaller reviews as part of ongoing monitoring.

How do audits support staff education?
The OIG's seven elements of an effective compliance program include effective training and education as one of the core requirements. Audit findings reveal where staff misunderstand coding rules, documentation expectations, or regulatory requirements. When organizations share audit results and provide targeted training in response, they use audits as a teaching tool rather than just a punitive mechanism. The CMS's emphasis on education in its medical review programs also shows that audits can help providers learn how to document and bill more accurately.

What is new or changing in auditing practices post‑2025?
The HIPAA Security Rule NPRM and the OIG's recommendations point toward broader and more detailed audits of security safeguards and coding documentation. The OIG and OCR have urged healthcare organizations to expand audits, implement administrative, physical, and technical safeguards, and establish standards for corrective actions—initiating compliance reviews. The CMS continues to refine its improper payment measurement and medical review programs, emphasizing documentation quality and eligibility processes.

These developments suggest that healthcare organizations should expect audits to increase and examine not just their billing and documentation, but also cybersecurity, access controls, and incident responses. If you haven't already, now is a great time to adjust your internal audit plans accordingly.