How to Prepare Your Skilled Nursing Facility for a CMS Billing Audit in 2026

A CMS billing audit does not arrive with much warning. Depending on the audit type, a skilled nursing facility may receive an Additional Documentation Request (ADR) letter with a 45-day response window, or a notification from the Targeted Probe and Educate program requesting specific medical records. By the time the request arrives, the clinical and billing records that will determine the outcome have already been written, the claims have already been submitted, and the facility’s level of audit readiness has already been established.

That reality makes audit preparation a proactive function, not a reactive one. The facilities that fare best in CMS audits are not those that respond most quickly to the ADR letter. They are the ones whose documentation, billing, and compliance processes have been operating at a standard that survives scrutiny before anyone requests a record review.

This post covers the CMS audit landscape as it applies to skilled nursing facilities in 2026, the documentation areas most reviewed, and the preparation steps that make the biggest difference in both reducing audit risk and managing audit impact when it occurs.

The CMS Audit Landscape for SNFs in 2026

Targeted Probe and Educate

The Targeted Probe and Educate (TPE) program are CMS’s primary claims review mechanism for identifying billing accuracy issues in provider populations. Under TPE, Medicare Administrative Contractors (MACs) select providers for review based on billing data analysis specifically looking for aberrant billing patterns relative to similar providers, high error rates in prior reviews, and claim patterns that suggest specific compliance risks.

A TPE review involves the MAC requesting medical records for a sample of claims, typically 20 to 40 claims per round. The MAC reviews the records and issues a determination for each claim paid correctly, overpaid, or denied. The facility receives education on the issues identified and may be subject to additional rounds of review if the error rate does not improve. TPE is educational in intent, but its financial and operational impact is real denied claims must be appealed or written off, and repeat review rounds create sustained administrative burden.

Recovery Audit Contractors

Recovery Audit Contractors (RACs) review post-acute care claims on a contingency basis they are paid a percentage of the improper payments they identify. SNF claims have been a consistent RAC audit target, particularly for medical necessity of skilled care, PDPM case-mix accuracy, and consolidated billing compliance. RAC audits can be retrospective reviewing claims that were paid years earlier which means the documentation that will be reviewed in a RAC audit may have been created well before the audit notice arrives.

Unified Program Integrity Contractors

Unified Program Integrity Contractors (UPICs) focus on fraud, waste, and abuse investigations that go beyond individual claim accuracy into patterns of billing behaviour. UPIC investigations are typically triggered by data analytics that identify statistical outliers in billing patterns unusually high PDPM case-mix scores relative to similar facilities, billing patterns inconsistent with census data, or claims patterns that suggest systematic over coding. UPIC involvement can result in payment suspension, which stops Medicare payments while the investigation proceeds.

Comprehensive Error Rate Testing

CERT reviews are statistical samples conducted annually by CMS contractors to measure the overall Medicare improper payment rate. Individual providers can be selected for CERT review as part of the national sample. While a single CERT review does not typically result in provider-level enforcement action, CERT findings at the national level drive the areas that subsequent TPE and RAC reviews focus on meaning CERT data from prior years previews where audit attention will concentrate in upcoming review cycles.

What this means for your facility: The most consequential audit for most SNFs in 2026 will be a TPE review from the local MAC. The best preparation for a TPE review is not a rapid-response protocol it is the daily billing and documentation standard that produces clean records before any audit is initiated.

What CMS Auditors Are Looking at in SNF Claims

Medical Necessity for Skilled Care

Every Medicare Part A SNF claim is evaluated against the standard that the care provided required skilled nursing or skilled therapy services daily and that those services were medically necessary. Auditors review the daily nursing notes, therapy evaluations, and physician documentation for evidence that skilled care was required at the professional level not that skilled services were delivered, but that they required that skill level.

Documentation that describes what was done without explaining why it required skilled professional involvement does not meet the medical necessity standard. A nursing note that describes wound care without documenting why the wound management required professional assessment and intervention rather than aide-level care leaves the claim vulnerable. A therapy note that documents exercises performed without documenting the clinical rationale for skilled therapeutic intervention does not support the skilled care requirement.

PDPM Case-Mix Accuracy

Auditors reviewing PDPM claims examine whether the HIPPS code on the claim accurately reflects the clinical information in the MDS assessment and whether the MDS assessment accurately reflects the clinical record. Both connections are audited. A HIPPS code that correctly reflects the MDS, but an MDS that does not accurately reflect the clinical record is still an improper payment the compliance risk flows from the MDS coding decision, not just from the claim.

Nursing and NTA component coding receives particular attention in PDPM audits because these components carry the highest audit risk relative to their payment weight. A Nursing component classification that is not supported by nursing documentation of the specific conditions and treatments that drove the coding is a common audit finding. An NTA comorbidity score that includes conditions not actively documented and treated during the assessment period is another.

Consolidated Billing Compliance

CMS auditors review whether outside providers have billed Medicare directly for services provided to Part A SNF residents during the covered stay. When an outside therapy company, laboratory service, or other vendor has submitted a claim to Medicare for a service that should have been consolidated under the SNF’s Part A claim, the audit finding applies to the outside vendor’s claim but creates compliance exposure for the SNF that was responsible for enforcing consolidated billing.

Physician Certification and Recertification

The presence, content, and timing of physician certifications and recertifications are consistently reviewed in SNF audits. An absent or unsigned certification is a straightforward finding. A certification that is signed after the billing period it covers, or a recertification that does not meet the content requirements for a medical review, are subtler findings that are equally consequential. Auditors look at the date of signature relative to the benefit period dates a certification signed after claims were submitted creates both a documentation finding and a payment question.

Pre-Audit Preparation: What to Do Before a Request Arrives

Conduct a Medical Necessity Documentation Review

Pull a sample of current Medicare Part A claims ideally twenty to thirty claims across different clinical categories and review the supporting documentation against the medical necessity standard. For each claim, the question is whether the daily nursing notes and therapy documentation clearly establish that skilled care was required, not just that it was provided. If the answer for any significant portion of the sample is no or not clearly, the documentation standard needs correction before an auditor reviews those records.

Audit Your PDPM Case-Mix Distribution

Compare your HIPPS code distribution against the clinical complexity of your resident population. If the distribution shows a concentration in lower clinical categories or lower component tiers that is inconsistent with the acuity of residents you serve, the case-mix distribution is a potential audit trigger and the documentation behind it is likely to have gaps that an auditor would identify. A pre-audit PDPM case-mix review is significantly less costly than a post-audit recoupment demand.

Review Physician Certification Timelines

Pull the certification and recertification documentation for every current Part A resident and verify that each certification is signed, dated within the required window, and contains the required content. A pre-audit certification review that identifies a gap allows the facility to obtain a late signature and document the correction. An auditor who identifies the same gap has a finding that the facility cannot retroactively correct.

Identify Your Consolidated Billing Exposure

Review which outside vendors are providing services to current Part A residents and confirm that each vendor understands its obligation to submit charges to the facility rather than to Medicare. If any outside vendor is currently billing Medicare directly for services to Part A residents, that billing needs to stop immediately before an auditor identifies it as a pattern.

Organize Your ADR Response Process

Before an ADR arrives, know who is responsible for responding, how medical records will be compiled and organized, and what the facility’s appeal process is if claims are denied. An ADR with a 45-day response window goes by quickly when the response process must be built from scratch. Facilities that have a documented ADR response protocol including who pulls records, who reviews the clinical documentation before submission, and who manages the appeal if the initial response results in denial consistently submit stronger responses in less time.

How MCA Medical Billing Solutions L.L.C. Supports SNF Audit Readiness

MCA Medical Billing Solutions, L.L.C. builds audit readiness into the ongoing billing management we provide through PDPM coding validation before MDS lockout, Triple Check execution that validates compliance documentation before each claim submits, and monthly case-mix distribution monitoring that identifies potential audit triggers before they reach an auditor’s data analysis.

If your facility wants a pre-audit billing and documentation review, contact MCA Medical Billing Solutions L.L.C. for a free assessment.