How to Write a Root Cause Analysis for Your Plan of Correction

By Maria Gonzalez, LNHA, Senior Compliance Strategist · 2026-04-11 · 9 min read

Root cause analysis is the foundation of an effective Plan of Correction, yet it's the element most facilities get wrong. This guide teaches you systematic methods to identify true root causes and write RCA sections that satisfy CMS reviewers.

Why Root Cause Analysis Matters in a POC

The Plan of Correction isn't just about fixing what went wrong — it's about demonstrating that you understand why it went wrong. Root cause analysis (RCA) is the critical link between identifying a deficiency and implementing corrections that actually prevent recurrence.

CMS reviewers evaluate whether your POC addresses the underlying systemic issue, not just the surface-level failure. A POC that describes corrective actions without explaining why the problem occurred will often be rejected or result in re-citation during revisit surveys.

Consider this example: A facility is cited for medication errors. A surface-level response might say 'Staff will be retrained on medication administration.' But without understanding why the errors occurred — was it staffing levels? A confusing medication packaging system? Inadequate shift handoff communication? A new agency nurse unfamiliar with the MAR system? — the corrective action may miss the mark entirely.

The RCA transforms your POC from reactive to proactive. It shows surveyors that you have the analytical capability to prevent future deficiencies, which is exactly what CMS wants to see.

The 5 Whys Technique for POC Writing

The 5 Whys is the simplest and most widely used root cause analysis method, and it works exceptionally well for Plan of Correction writing. The technique involves asking 'Why?' repeatedly until you reach the fundamental cause.

Example — F0761 (Free from Unnecessary Medications) Citation:

Problem: Resident received an antipsychotic medication without a documented clinical indication.

Why? The medication was continued at admission from the hospital without review.
Why? The admitting physician signed orders without evaluating the indication.
Why? The facility's admission process doesn't include a mandatory medication reconciliation review within 48 hours.
Why? No policy exists requiring pharmacist review of admission orders for psychotropic medications.
Why? The QAPI committee hadn't identified admission medication reconciliation as a process gap.

Root Cause: The facility lacks a systematic process for reviewing psychotropic medications at admission, allowing hospital orders to continue without clinical justification.

Notice how each 'Why' moves from the specific incident to the systemic issue. Your POC corrective actions should address the root cause (creating a medication reconciliation process) rather than just the surface problem (retraining one physician).

Tips for Using 5 Whys:

Don't stop at 'human error' — ask why the system allowed the error to occur
Don't stop at 'didn't follow policy' — ask why the policy wasn't followed
Each answer should be factual, not speculative
The root cause should be something you can actually fix

Fishbone Diagram Analysis for Complex Citations

For complex or systemic citations, the fishbone (Ishikawa) diagram provides a more structured analysis by examining contributing factors across multiple categories.

Standard Categories for Nursing Home RCA:

1. People (Staff):

Staffing levels and skill mix
Training and competency
Communication between shifts and departments
Agency/float staff orientation
Supervision adequacy

2. Process:

Policies and procedures (existence, clarity, accessibility)
Assessment and care planning processes
Documentation systems
Handoff and communication protocols
Monitoring and follow-up procedures

3. Equipment/Environment:

Availability and functionality of equipment
Physical environment barriers
Supply chain issues
Technology systems (EHR, eMAR)

4. Management/Systems:

Oversight and accountability structures
QAPI processes
Resource allocation
Organizational priorities and culture

How to use in your POC: After mapping contributing factors across these categories, identify which category contains the primary root cause and which contain contributing factors. Your corrective action should address the primary root cause, while your systemic prevention should address the contributing factors.

Example: A fall with injury might have a primary root cause in Process (no post-fall assessment protocol) with contributing factors in People (CNA didn't report a near-miss) and Equipment (bed alarm battery was dead). Address all three in your POC.

Writing the RCA Section of Your POC

Now let's translate your analysis into the written POC. The RCA section should appear within your corrective action narrative, demonstrating the logical connection between the problem, the cause, and your solution.

Structure for Each Cited Deficiency:

1. State the deficiency finding (1-2 sentences summarizing what was cited)
2. Describe the investigation conducted (what did you review, who did you interview)
3. Present the root cause finding (clear, specific statement)
4. Connect to corrective action (how your actions address the root cause)

Example RCA Statement:
'Investigation of the cited deficiency revealed that the root cause was the absence of a standardized wound assessment protocol for weekend nursing staff. The facility's wound care nurse performs assessments Monday through Friday, but no written protocol existed for weekend nurses to assess, stage, document, and report wound changes. This gap allowed a Stage 2 pressure injury to progress without timely intervention or physician notification. To address this root cause, the facility has implemented a Weekend Wound Assessment Protocol requiring licensed nurses to assess all identified wounds every shift using a standardized documentation tool, with criteria for immediate physician notification.'

What to Avoid:

Blaming individual staff members by name
Vague statements like 'staff failed to follow procedures'
Identifying training as the sole root cause (training is usually a contributing factor, not a root cause)
Using language that minimizes the finding or disputes the survey team's conclusions
Circular reasoning ('the problem occurred because it wasn't prevented')

Common RCA Mistakes That Lead to POC Rejection

Understanding why POCs get rejected helps you write stronger root cause analyses the first time.

Mistake 1: Treating the Symptom, Not the Cause
Weak: 'The root cause was that staff did not document the assessment.'
Strong: 'The root cause was the absence of a structured assessment documentation template in the EHR, which resulted in inconsistent documentation practices among nursing staff.'

Mistake 2: Stopping Too Early in the Analysis
Weak: 'The root cause was a staffing shortage on the evening shift.'
Strong: 'The root cause was inadequate staffing contingency planning — the facility's staffing plan did not account for concurrent PTO and call-offs, and no protocol existed for activating backup staffing resources when census-to-staff ratios fell below minimum thresholds.'

Mistake 3: Identifying Multiple Root Causes Without Prioritization
Surveyors want to see that you've identified the primary driver. If you list five root causes, it appears you haven't determined what actually went wrong.

Mistake 4: Using Root Cause as an Excuse
Weak: 'The root cause was the vendor's failure to deliver supplies on time.'
Strong: 'The root cause was the absence of a supply monitoring system with reorder triggers, which made the facility dependent on just-in-time delivery without backup inventory for critical supplies.'

Mistake 5: Not Connecting the Root Cause to Systemic Prevention
Every root cause should logically lead to a systemic change. If your root cause doesn't suggest a clear corrective action, you may not have identified the true root cause.

Integrating RCA with QAPI for Ongoing Improvement

Root cause analysis shouldn't end when the POC is submitted. Integrating RCA into your QAPI program creates a continuous improvement cycle that reduces future citations.

Immediate Actions (within POC timeframe):

Complete the RCA for each cited deficiency
Implement corrective actions addressing root causes
Begin monitoring to verify effectiveness

Short-term Integration (1-3 months):

Present RCA findings at QAPI committee meetings
Evaluate whether corrective actions are achieving intended outcomes
Adjust interventions based on monitoring data
Identify any related processes that share the same root cause vulnerability

Long-term Systemic Change (3-12 months):

Incorporate RCA findings into Performance Improvement Projects (PIPs)
Update policies, procedures, and training based on systemic gaps identified
Benchmark against industry standards and CMS Quality Measures
Conduct proactive RCA on near-misses before they become deficiencies

Documentation for Revisit Surveys:

Maintain organized RCA documentation showing the analytical process
Keep monitoring logs demonstrating ongoing compliance
Track trend data showing improvement after interventions
Have QAPI meeting minutes reflecting discussion of root causes and corrective actions

Surveyors reviewing your facility during revisit will look for evidence that you not only fixed the specific problem but built systems to prevent similar issues. Strong RCA documentation is your best evidence of genuine quality improvement.

Frequently Asked Questions

How detailed should the root cause analysis be in a POC?

The RCA should be detailed enough to demonstrate that you investigated the problem thoroughly and identified the systemic issue, but concise enough to be actionable. Typically 2-4 sentences identifying the investigation process, the root cause finding, and how it connects to your corrective action. Avoid multi-page analyses in the POC itself — keep the detailed investigation documentation in your facility files.

Can training alone be a valid root cause?

Training alone is rarely the true root cause. If staff weren't trained, ask why — was there no training program? Was the topic not included? Were new hires missed? The root cause is usually the system failure that allowed the training gap, not the gap itself. However, training is almost always part of the corrective action.

What if the root cause involves a staffing shortage?

Staffing shortages are typically contributing factors, not root causes. The root cause is usually the system that failed to ensure adequate staffing — lack of contingency planning, absence of minimum staffing thresholds, no protocol for managing call-offs, or inadequate recruitment pipeline. Address the systemic staffing management issue in your POC.

Should we use formal RCA tools like fishbone diagrams in the POC document?

You don't need to include the visual diagram in the POC itself. Instead, reference that an investigation was conducted and state the root cause finding. Keep the fishbone diagram or 5 Whys worksheet in your facility's quality improvement files — surveyors may ask to see your investigation documentation during revisit.