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Industries Healthcare Case Study: Improving Medical Bill Review Cycle Time

Case Study: Improving Medical Bill Review Cycle Time

When the clock is ticking in time-bound, customer-sensitive operations, using Lean Six Sigma can be a smart move toward achieving operational excellence and customer satisfaction. In this case study, one large insurance company executed a Lean Six Sigma project to cut operational costs for property and casualty (P&C) insurance claims and improve customer satisfaction. The project was completed in the medical bill review process for personal injury protection (PIP) and medical payment (med pay) auto insurance coverage. PIP and med pay are part of the auto insurance coverage that pays for medical expenses, funeral expenses, and, in some cases, lost wages and other damages resulting from an automobile accident for the insured customers and others riding in a car or walking.


The insurance company outsourced its PIP and med pay bill review process to a leading medical bill review company. The medical bill review process was laden with repetitive and inefficient handoffs between the insurance company and its outsourcing partner, which led to loss of money and time. Delays in the bill review process also caused customer dissatisfaction, which manifested in a high volume of inbound phone calls as customers and medical providers sought to understand the status of bill payment. Also, delays beyond 30 days in the medical bill review process lead to payment of interest, fines and penalties, as there are 30 states (within the United States) that have legal regulation for a bill review cycle time of 30 days.

The goal of the project was to reduce the average cycle time of the PIP and med pay bill review process from 28 days to 15 days. The targeted benefit was an annual cost saving of $1 million, based on savings in partner bill review expenses, adjusting expenses, loss cost, cost of law suit avoidance and cost of non-value-added activities.


In order to measure improvement, the team defined the key output metric for the PIP and med pay bill review process (Table 1).

Table 1: Operational Definition of Output Metric

Key Output MetricDefinitionMeasurement UnitSpecification Limits
Process cycle timeElapsed time between start of bill review process until decisionDaysUpper (USL) = 30 days for 30 selected states, Lower (LSL) = 0 days

They also created an as-is map of the process (Figure 1).

Figure 1: PIP and Med Pay Bill Review As-is Process

Figure 1: PIP and Med Pay Bill Review As-is Process

There are 30 states that require a 30-day-or-less bill review cycle time. Figure 2 shows that on average, bill review cycle time is 28 days for all states. For states where there is no legal requirement of 30 days, bill review cycle time is 70 days.

Figure 2: Average Process Cycle Time in States With and Without Time Requirements

Figure 2: Average Process Cycle Time in States With and Without Time Requirements


The team created a fishbone diagram to outline potential causes for bill review cycle time greater than 30 days related to the machines, methodology, providers, measurements, partner operations and internal operations involved.

They also conducted hypothesis testing, which confirmed that the 30-day bill review response time requirement does impact actual turnaround time (Figure 3).

Figure 3: No Response Time Requirement vs. Response Time Requirement

Figure 3: No Response Time Requirement vs. Response Time Requirement

Two-sample T-test for states with no response-time requirement vs. states with response-time requirement

NMeanStDevSE Mean
No response-time requirement100031.633.91.1
Response-time requirement98727.325.40.81

Difference = mu (No response-time requirement) – mu (Response time requirement)

Estimate for difference: 4.22571

95% CI for different (1.592888, 6.855853)

T-test of difference = 0 (vs not =). T-value = 3.15 P-value = 0.002 DF = 1853

Conclusion: 30-day response-time requirement does impact bill review cycle time.


Next, the team conducted process value analysis to identify the non-value-added activities contributing to delays in the bill review process (Table 2).

Table 2: Wasteful Activities and Solutions

Non-value-added ActivitiesSolution SnapshotProjected Savings
Redundant partner review of bills – Certain bills were denied for payment due to unreasonable, unrelated and unnecessary causes at the end of the bill review of processBills should come to the examiner first to check policy limits, coverage, deductible, relatedness and need for medical records, and then be emailed to the bill review partner for further review. Adjuster should provide reasons for overridingand fees for such bills should not be paid to bill review partner.$50,000
Re-review of bills due to lack of informationMedical provider should pay the processing fee for errors in the bill. They should also be charged for medical records request fees for not sending medical records along with bills for those states where medical records are mandated.$230,000
Untimely payment, denial of bills due to lack of metrics for turnaround timeTrack compliance of partners and insurance company with bill review cycle time service-level agreement. USL for bill review cycle time needs to be set to 30 days for all states. Twenty-one days should be set as the target for average bill review cycle time.$47,000
Inconsistencies in bill review for same medical treatment at a given time at the same physical locationIdentify medical treatment codes where the variation is observed. Complete a gage R&R check for medical bill review regularly tp rectify inconsistencies in partner medical bill review process. Add reward/penalty clauses in the partner’s contract for handling inconsistencies in partner’s recommendations that lead to lawsuits.$330,000
Bill review summary called explanation of benefits (EOB) and payment check sent are separately, leading to confusion and calls from medical providers and customers.Automatic payment – EOB and check printed in house within insurance company.$129,000
EOB unnecessarily sent for bills paid in full. Effort spent on unnecessary tasks leads to loss of bill review throughput capacity.Printing and mailing EOB to be stopped for bills paid in full.$40,000
Partner unnecessarily reviewing bills from non-partner bill review states: MD, AL, LA, MO, MS, OK, TNProper communication mechanism to be established between unit managers, imaging and scanning area and medical management team on a standard frequency regarding the states that will not send bills to partner.$30,000
Paying flat bill review fees per billContract to be revised with partner to pay bill review fees per line item instead.$340,000
Grand total:$1.619M

Figure 4 shows the PIP and med pay bill review to-be process (process steps marked in red are the changes to as-is process).

Figure 4: Bill Review To-be Process

Figure 4: Bill Review To-be Process


The team tested the new process with pilots in a few states initially, and rolled out a detailed control plan to all states after the success of the pilot.

Bill review cycle time was reduced from 28 days to 15 days by controlling the items causing variation and delays. This helped the company avoid paying $1.6 million in interest, penalties, fines and law suit fees.


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Leave a Comment


Chris Seider

I would have done a capability analysis to understand how much the tails contribute to means. Did you do median comparison to see if the improvement was just on the outliers or if the process truly shifted?

Nice write up.

Derek N

Hi Rajiv,

Thank you for the great post. I am in the process of reducing the cycle time for our revenue cycle management process which is very similar to what you’ve done. Were you the one spearheading this process improvement project?


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