Home Health Internal Audit: How to Review 30 Charts Before CMS Reviews Them for You

Medicare contractors rarely review an entire home health agency. They review a sample. Targeted Probe and Educate (TPE) rounds typically review 20 to 40 claims. Review Choice Demonstration (RCD) reviews every billing period in participating states, but agencies are judged on their affirmation rate. Unified Program Integrity Contractors (UPICs) and Recovery Audit Contractors review samples and may extrapolate the results.

A 30-chart internal audit lets an agency see its records the way a contractor would, at a size small enough to complete quickly. It will not give a statistically valid estimate of overpayments, but it can reveal whether problems exist, where they are concentrated, and what to fix first.

This article explains how to plan and run a 30-chart home health audit: choosing the charts, building the review tool, reviewing each element, scoring results, interpreting what 30 charts can and cannot tell you, writing corrective actions, and deciding when to expand. It is educational and does not replace legal or professional advice.

Why 30 Charts?

Thirty charts is a practical size for a probe audit:

• It is similar in size to a TPE round of 20 to 40 claims.

• It can be completed by a small team in a reasonable time.

• It is large enough to show patterns across clinicians, diagnoses, and claim types.

• It is small enough to repeat quarterly.

What 30 Charts Can Tell You

• Whether common errors exist.

• Which elements fail most often.

• Which clinicians, teams, or referral sources need attention.

• Whether corrective actions are working, when compared with prior audits.

What 30 Charts Cannot Tell You

• A statistically valid estimate of the total overpayment across all claims.

• A precise error rate for the entire agency.

If results will be used to estimate an overpayment for repayment or a self-disclosure, a statistically valid random sample is needed. OIG's Health Care Fraud Self-Disclosure Protocol, for example, requires a review of all affected claims or a statistically valid random sample of at least 100 claims. CMS's Medicare Program Integrity Manual, Chapter 8, describes the sampling methods contractors use.

Step 1: Decide the Purpose and Ownership

Purpose

Common purposes include:

• Readiness for TPE or RCD.

• A baseline review of a new service, branch, or acquired agency.

• Follow-up on prior findings.

• Response to outlier data, such as PEPPER or rising denials.

Ownership

• The compliance officer usually oversees the audit.

• Reviewers should be independent of the work reviewed where possible.

• Consider whether legal counsel should direct the audit to help protect privilege, especially if findings may reveal significant overpayments or legal issues.

Step 2: Select the 30 Charts

Define the Universe

Choose a defined group of claims, such as all final claims paid in the past six months.

Choose a Selection Method

Options include:

• Simple random selection. Use a random number generator to select 30 claims from the universe. This gives the most objective picture.

• Stratified selection. Divide the universe into groups and select a set number from each. For example: 10 early periods and 20 late periods, or a set number from each team.

• Risk-targeted selection. Focus on high-risk claims, such as those matching your MAC's TPE edits, high functional impairment periods, long lengths of stay, or periods just above LUPA thresholds.

Many agencies combine approaches, such as 20 random charts and 10 risk-targeted charts, and report the results separately.

A Suggested Mix for a General Readiness Audit

• 10 start-of-care periods, to test intake, face-to-face, and certification.

• 10 subsequent or recertification periods, to test recertification and ongoing skilled need.

• 5 periods matching your MAC's current TPE edits.

• 5 periods with high case-mix indicators, such as high functional impairment or comorbidity adjustments.

Document the Selection

Record the universe, the method, the random number source and seed if used, and the list of selected claims.

Step 3: Build the Review Tool

A good review tool makes results consistent and comparable over time. For each chart, include:

Identifying Information

• Claim number, billing period dates, period type, HIPPS code, principal diagnosis, number of visits, and payment.

Eligibility Elements

• Homebound status supported in the agency record.

• Homebound status supported in the practitioner or facility record.

• Skilled need supported.

• Under care of a physician or allowed practitioner.

Certification Elements

• Face-to-face encounter within the required window.

• Encounter related to the primary reason for home health.

• Encounter performed by a permitted practitioner.

• Encounter date documented by the certifying practitioner.

• Certification statements complete.

• Certification signed and dated before billing.

• Management and evaluation narrative, if applicable.

• Recertification estimate, if applicable.

Plan of Care and Orders

• Plan of care includes required elements.

• Plan of care signed and dated before billing.

• Frequency and duration ordered.

• Verbal orders documented and authenticated.

• Visits match orders.

Visit Documentation

• Each skilled visit shows a skilled service.

• Patient response documented.

• Therapy reassessments completed at least every 30 days with objective measures.

• Notes are individualized, not copied.

• Signatures and dates present.

OASIS and Coding

• PDGM functional items supported by the record.

• M1033 risk factors supported.

• Principal diagnosis consistent with practitioner documentation and focus of care.

• Secondary diagnoses documented and relevant.

• Coding conventions followed.

LUPA and Payment

• Visit count supports the payment, considering only supported visits.

Result

• Pass, fail, or partial, with the reason and the estimated payment effect.

Step 4: Review Each Chart the Way a Contractor Would

Use Contractor Standards

Apply Medicare statutes, regulations, the Medicare Benefit Policy Manual, Chapter 7, the Medicare Program Integrity Manual, coding guidelines, and the OASIS Guidance Manual in effect on the dates of service.

Use Qualified Reviewers

Use clinicians for eligibility and skilled need questions and certified coders for coding and OASIS questions.

Review Only What Is in the Record

Contractors decide based on what is submitted. Do not assume documentation exists if it is not in the chart.

Record Findings Clearly

For each failed element, note the specific problem and the rule it violates.

Step 5: Score the Results

Claim-Level Error Rate

Divide the number of charts with at least one payment-affecting error by 30.

Dollar Error Rate

Divide the total dollars in error by the total dollars reviewed. Some MACs evaluate TPE results by dollars, so calculate both.

Element-Level Failure Rates

For each element, calculate the share of charts that failed. This shows where to focus.

Breakdown by Group

Break results down by clinician, team, branch, referral source, diagnosis, and period type.

Compare With Benchmarks

Compare results with your MAC's TPE threshold, the RCD 90 percent affirmation threshold if applicable, and your prior audits.

Step 6: Interpret the Results

Low Error Rate

If few errors are found, document the results, continue routine monitoring, and repeat the audit on a schedule.

Moderate Error Rate

If errors are concentrated in one or two elements, target education and process changes, then re-audit in three months.

High Error Rate or Systemic Problems

If errors are widespread or suggest a systemic problem, such as consistently missing face-to-face documentation or plans of care billed before signatures, consider:

• Expanding the review to a larger or statistically valid sample.

• Consulting counsel about overpayment obligations.

• Placing affected services or clinicians on prebill review until accuracy improves.

Potential Legal Issues

If findings suggest potential fraud, kickbacks, or other legal violations, stop and consult counsel before proceeding.

Step 7: Write the Corrective Action Plan

For each finding, include:

• The problem and its root cause.

• Specific corrective actions.

• The person responsible.

• Deadlines.

• How success will be measured.

• A follow-up audit date.

Common Corrective Actions After a 30-Chart Audit

• Intake checklists requiring face-to-face documentation review at referral.

• Billing holds for unsigned plans of care and certifications.

• Recertification form updates requiring the estimate of continued need.

• Clinician training on homebound and skilled need documentation.

• OASIS accuracy training on PDGM functional items.

• Coding education and practitioner query processes.

• EHR template changes to discourage copy-forward documentation.

• Therapy reassessment tracking.

• Referral source education.

Step 8: Address Overpayments

If the audit finds claims that were paid in error, evaluate obligations under the 60-day overpayment rule at 42 CFR 401.305. The rule requires providers to report and return identified overpayments, and allows the deadline to be suspended for a timely, good-faith investigation of related overpayments. A 30-chart probe may show that a broader review is needed to determine the full extent of the problem.

Step 9: Report the Results

Prepare a short report for leadership and the compliance committee that includes:

• Purpose and scope.

• Selection method.

• Review standards.

• Error rates and key findings.

• Root causes.

• Corrective actions.

• Next steps.

Report significant findings to the governing body, consistent with OIG's General Compliance Program Guidance.

Step 10: Repeat

Repeat the audit quarterly or semiannually, rotating focus areas and comparing results. Track trends over time.

A Sample 30-Chart Scoring Summary

The following illustrates how results can be summarized. The numbers are examples, not benchmarks.

Overall

• Charts reviewed: 30.

• Charts with at least one payment-affecting error: 7, for a claim-level error rate of about 23 percent.

• Dollars reviewed: about $60,000.

• Dollars in error: about $11,000, for a dollar error rate of about 18 percent.

Element-Level Failures

• Face-to-face encounter documentation: 5 charts.

• Homebound status: 4 charts.

• Plan of care signed before billing: 3 charts.

• Skilled need on one or more visits: 3 charts.

• Recertification estimate: 2 charts.

• OASIS functional scoring unsupported: 2 charts.

• Coding issues: 2 charts.

Some charts had more than one error.

What This Tells Leadership

Face-to-face and homebound documentation are the top priorities. Billing before signatures is a process problem that a billing hold can fix. OASIS and coding issues are less frequent but should be monitored.

Tips for Efficient Chart Review

• Assemble each chart in a consistent order before review begins.

• Use a checklist so reviewers do not miss elements.

• Review the referral, practitioner records, and face-to-face documentation first, because eligibility failures make other elements irrelevant to payment.

• Note page numbers or document names for each finding to support follow-up.

• Have a second reviewer check a few charts for consistency.

• Hold a short calibration meeting before starting so reviewers apply standards the same way.

Involving Clinical Staff

Clinical staff are more likely to improve documentation when they understand the findings.

• Share results with teams in a constructive way.

• Use real examples, with patient information protected.

• Explain the rule behind each finding.

• Ask clinicians what gets in the way of good documentation.

• Recognize improvements.

Using the 30-Chart Audit for RCD and TPE Readiness

For RCD Agencies

Use the RCD elements as the core of the review tool and compare results with the 90 percent affirmation threshold. Charts that would be non-affirmed show where pre-claim review packets or postpayment ADR responses need work.

For TPE Readiness

Include charts matching your MAC's current TPE edits and calculate your error rate using your MAC's method. If your rate exceeds your MAC's threshold, focus corrective actions on the failing elements before you are selected.

Protecting Audit Work Papers

• Store audit work papers securely, consistent with HIPAA.

• Limit access to those who need it.

• If counsel directs the audit, follow counsel's instructions on labeling and distribution.

• Retain work papers according to your record retention policy.

A Sample Timeline

• Week 1: Define purpose, select the sample, and finalize the review tool.

• Weeks 2 and 3: Gather records and review charts.

• Week 4: Score results, analyze root causes, and draft the report and corrective action plan.

• Weeks 5 to 12: Implement corrective actions.

• Week 13: Begin the follow-up audit.

Common Mistakes

• Selecting charts that are known to be strong.

• Reviewing without a consistent tool.

• Using reviewers who are not familiar with Medicare standards.

• Giving credit for documentation that is not in the chart.

• Treating a 30-chart probe as a statistically valid estimate.

• Producing findings without root causes or corrective actions.

• Ignoring overpayments identified by the audit.

• Never repeating the audit.

A Hypothetical Example

A home health agency in a Review Choice Demonstration state has an affirmation rate just under 90 percent. It conducts a 30-chart audit using 20 random charts and 10 charts matching its MAC's TPE edits. Results show:

• Face-to-face problems in 6 of 30 charts, all from start-of-care periods and mostly from two referral sources.

• Plans of care signed after billing in 4 charts, all from one branch.

• Weak homebound documentation in 5 charts, mostly for patients with hypertension as the principal diagnosis.

The agency adds an intake face-to-face check, implements a billing hold for unsigned plans of care at the branch, educates clinicians on homebound documentation, and meets with the two referral sources. It evaluates whether the claims billed before signatures created overpayments and works with counsel on next steps. A follow-up 30-chart audit three months later shows face-to-face problems in 1 chart, no billing before signatures, and stronger homebound documentation, and the agency's affirmation rate rises above 90 percent.

Choosing Between Internal and External Reviewers

Internal Reviewers

• Know the agency's systems and staff.

• Can audit more often at lower cost.

• May be less objective, especially when reviewing their own team's work.

External Reviewers

• Bring independence and experience with contractor reviews.

• Can benchmark results against other agencies.

• May be better suited for audits that leadership or the board will rely on, or that counsel directs.

Many agencies alternate, using internal reviewers for quarterly 30-chart audits and external reviewers once or twice a year.

Turning Results Into a Dashboard

Leadership often responds best to a simple, repeatable dashboard. After each 30-chart audit, update:

• Claim-level and dollar error rates, with the prior audit's results for comparison.

• The top five failing elements.

• Results by branch or team.

• Corrective actions open, completed, and overdue.

• Overpayments identified and returned.

A one-page summary like this helps leaders track progress without reading every finding.

Questions Reviewers Should Ask on Every Chart

• If I were the MAC reviewer, would I affirm this period based only on what is in this chart?

• Is the patient's eligibility clear from the practitioner's records, not just the agency's?

• Does every billed visit show why a nurse or therapist was needed?

• Would the payment group stay the same if a coder and an OASIS expert reviewed it?

• Is anything signed, dated, or ordered after the claim was billed?

Planning the Next Audit

• Keep the same review tool so results are comparable.

• Rotate the risk-targeted portion of the sample to new areas.

• Include charts from clinicians or teams that received education.

• Add charts matching any new TPE edits or RCD findings.

• Consider a larger or statistically valid sample if problems persist.

Common Findings and Quick Fixes

• Face-to-face note missing at billing: add an intake hold until the note is received.

• Plan of care signed after billing: add a billing edit that blocks claims without a signature date.

• Recertification missing an estimate: add a required field to the recertification form.

• Generic homebound statements: add narrative prompts for both criteria.

• Missing therapy reassessments: add tracking alerts by discipline.

Key Takeaways

• A 30-chart audit mirrors the size of a TPE round and can be completed quickly.

• Select charts objectively and document the selection.

• Use a consistent tool that covers eligibility, certification, plan of care, visits, OASIS, coding, and payment.

• Calculate claim-level and dollar error rates, and break results down by group.

• Do not treat a 30-chart probe as a statistically valid overpayment estimate.

• Fix root causes, address overpayments, and repeat the audit.

Frequently Asked Questions

Is a 30-chart audit enough?

For discovery and readiness, it is often useful. For estimating overpayments across the agency, a statistically valid sample is needed.

How should charts be selected?

Random selection gives the most objective picture. Many agencies combine random charts with charts matching known risk areas, such as TPE edits.

Who should review the charts?

Qualified clinicians and coders familiar with Medicare home health requirements, ideally independent of the work reviewed.

What should we do if we find overpayments?

Evaluate obligations under the 60-day rule, consider whether a broader review is needed, and report and return overpayments as required.

How often should we repeat the audit?

Quarterly or semiannually is common, with follow-up audits after corrective actions.

Conclusion

A 30-chart internal audit is one of the most practical tools a home health agency has. It mirrors the size of contractor reviews, can be completed quickly, and reveals where documentation is likely to fail. By selecting charts objectively, using a consistent review tool, applying contractor standards, scoring results carefully, fixing root causes, addressing overpayments, and repeating the process, agencies can find and fix their weak points before CMS reviews those charts for them.

How HealthBridge Can Help

HealthBridge is a healthcare management consulting firm that conducts 30-chart and larger home health audits, builds review tools, analyzes results, develops corrective action plans, and performs follow-up audits. When privilege is important, we work under the direction of our clients' legal counsel. If you would like an independent review of your charts, please get in touch with us. We will be happy to help you with this topic.

References

• Centers for Medicare & Medicaid Services. Targeted Probe and Educate (TPE). https://www.cms.gov/data-research/monitoring-programs/medicare-fee-service-compliance-programs/medical-review-and-education/targeted-probe-educate-tpe

• Centers for Medicare & Medicaid Services. Medicare Benefit Policy Manual, Chapter 7, Home Health Services. https://www.cms.gov/Regulations-and-Guidance/Guidance/Manuals/downloads/bp102c07.pdf

• Centers for Medicare & Medicaid Services. Medicare Program Integrity Manual, Chapter 3. https://www.cms.gov/regulations-and-guidance/guidance/manuals/downloads/pim83c03.pdf

• Centers for Medicare & Medicaid Services. Medicare Program Integrity Manual, Chapter 8, Section 8.4, Statistical Sampling for Overpayment Estimation. https://www.cms.gov/regulations-and-guidance/guidance/manuals/downloads/pim83c08.pdf

• Centers for Medicare & Medicaid Services. OASIS Data Sets and OASIS Guidance Manual. https://www.cms.gov/medicare/quality/home-health/oasis-data-sets

• Centers for Medicare & Medicaid Services. Review Choice Demonstration for Home Health Services. https://www.cms.gov/research-statistics-data-and-systems/monitoring-programs/medicare-ffs-compliance-programs/review-choice-demonstration/review-choice-demonstration-for-home-health-services

• U.S. Department of Health and Human Services, Office of Inspector General. General Compliance Program Guidance. https://oig.hhs.gov/compliance/general-compliance-program-guidance/

• U.S. Department of Health and Human Services, Office of Inspector General. Health Care Fraud Self-Disclosure Protocol. https://oig.hhs.gov/compliance/self-disclosure-info/

• U.S. Department of Health and Human Services, Office of Inspector General. RAT-STATS Statistical Software. https://oig.hhs.gov/compliance/rat-stats/

• Electronic Code of Federal Regulations. 42 CFR 424.22, Requirements for Home Health Services. https://www.ecfr.gov/current/title-42/chapter-IV/subchapter-B/part-424/subpart-B/section-424.22

• Electronic Code of Federal Regulations. 42 CFR 401.305, Requirements for Reporting and Returning of Overpayments. https://www.ecfr.gov/current/title-42/chapter-IV/subchapter-A/part-401/subpart-D/section-401.305