10 Top Pharmacy Diversion Indicators to Watch

A single unexplained controlled substance discrepancy does not necessarily mean something improper happened. Sometimes there is a reasonable explanation - a receiving error, a dispensing correction, a return that was not properly documented, or a simple data-entry mistake.

When I start seeing a pattern of discrepancies, late inventory adjustments, unusual ordering, or the same issues happening repeatedly without a documented explanation, that gets my attention.

One discrepancy may be a mistake. A pattern tells you that something in the process needs to be looked at more closely.

The indicators discussed in this article are not, by themselves, proof of diversion or misconduct. They are warning signs that should prompt the pharmacy to stop, look at the records, and figure out what is actually happening.

The goal is not to assume the worst. The goal is to catch problems early, determine why they happened, correct the underlying issue, and make sure the pharmacy can account for its controlled substances when DEA comes knocking.

Why pharmacy diversion indicators require context

One of the biggest mistakes a pharmacy can make is looking at a single discrepancy and immediately deciding that it either means nothing or that someone must be diverting drugs.

That's not how an investigation works.

When I review a pharmacy's controlled substance records, I'm looking at the bigger picture. I want to see how the inventory, purchasing, dispensing, returns, transfers, adjustments, security, and employee access all fit together. If those pieces don't make sense when they're compared against each other, that's when I start asking questions.

A pharmacy shouldn't rely on an annual inventory or assume that its pharmacy software is going to catch every problem. Software can tell you something doesn't add up. It can't always tell you why it doesn't add up.

Context matters.

A discrepancy could have a perfectly reasonable explanation. Maybe there was a wholesaler shortage. Maybe the pharmacy changed software. Maybe a return was processed incorrectly, or a dispensing transaction had to be corrected. Those things happen.

Once a discrepancy is identified, don't just make an adjustment and move on. Find out what happened. Look at the supporting records. Document the explanation. Then make sure the numbers actually reconcile.

What concerns me is not necessarily the first discrepancy. It's when the same types of discrepancies keep showing up, explanations can't be supported by the records, or no one is taking the time to figure out why they're happening.

That's when a pharmacy needs to take a much closer look.

10 top pharmacy diversion indicators to investigate

1. Repeated inventory discrepancies

One of the first things I look at when reviewing a pharmacy's controlled substance records is whether the inventory actually reconciles.

Recurring shortages or overages involving controlled substances should not simply be written off as "small" or "probably a counting error." I want to know where that number came from and whether the pharmacy can support the difference with documentation.

The perpetual inventory should be able to tell a consistent story when compared against physical counts, invoices, dispensing records, returns, transfers, and destruction records. If those numbers don't line up, that's when you need to start asking questions. I'm not just looking at the quantity of the discrepancy. I'm looking at the pattern.

Is this happening with the same controlled substance? Is it happening repeatedly? Is there a particular time period, shift, transaction, or employee associated with the discrepancies? Are the variances always in the same direction? Are adjustments being made afterward to make the inventory balance?

A single discrepancy may have a reasonable explanation. Repeated discrepancies tell me there may be a problem with the pharmacy's controls, recordkeeping, or processes that needs to be addressed. Don't get into the habit of saying, "It's only a few pills."

A few pills today can become a much bigger problem tomorrow if nobody takes the time to figure out why they're missing.

2. Delayed or unsupported inventory adjustments

Inventory adjustments are sometimes necessary. Mistakes happen, transactions get entered incorrectly, and legitimate corrections have to be made. The problem is when adjustments become a way to make the numbers work without actually determining what happened. When I see an adjustment entered days or weeks after a discrepancy was identified, one of my first questions is, why?

Who discovered the discrepancy? Who made the adjustment? Who approved it? What was the reason for the adjustment? And most importantly, where is the documentation supporting it? An adjustment should correct a known error - not simply make an inventory balance.

If the same person is repeatedly making or approving adjustments, that's another area I would want management to examine. There should be appropriate supervisory review and, when possible, separation between the person identifying a discrepancy, making the correction, and approving it.

The goal is not to prevent legitimate corrections. The goal is to make sure every adjustment has a reason, a record, and someone who is accountable for it.

If you can't look at an adjustment later and understand what happened, why it happened, who corrected it, and who approved it, the adjustment isn't telling you much - and that's a problem.

3. Unusual ordering patterns

Ordering patterns can tell you a lot about what is happening inside a pharmacy.

If a pharmacy's controlled substance purchases suddenly increase, but the dispensing volume and patient population haven't changed, I want to know why. The same goes for orders that stay unusually high even when prescription volume is declining or repeated emergency orders for medications that are normally kept in regular inventory.

I'm not saying that an increase in ordering automatically means something is wrong. There may be a legitimate reason for it. That's why you have to look at the records and put the ordering activity into context.

When I review purchasing activity, I want to compare it against the pharmacy's dispensing records, on-hand inventory, returns, and the patients the pharmacy is actually serving.

The question is simple: Can the pharmacy account for what it is ordering?

If the pharmacy is purchasing significantly more controlled substances than it can reasonably account for through dispensing, inventory, returns, transfers, or other documented activity, that's a warning sign that should not be ignored.

You don't have to assume diversion is occurring. You do need to figure out where the product is going.

4. Dispensing activity that does not match inventory movement

Another thing I look at is whether the pharmacy's dispensing activity actually makes sense when compared to its inventory. If a pharmacy is regularly ordering a controlled substance but the dispensing records don't show where that product is going, I want to know why. The same is true if dispensing volume suddenly increases without a corresponding change in patient volume or legitimate business activity.

This is where you have to dig a little deeper than just looking at the number of prescriptions filled.

I want to see the prescriptions, reversals, partial fills, transfers, prescriptions waiting for pickup, out-of-stock records, returns, and prescriptions that were returned to stock. Each of those transactions can affect the pharmacy's inventory, and the records should tell a consistent story.

The goal isn't simply to find a number that doesn't match. The goal is to be able to follow the controlled substance from the time it enters the pharmacy until you can account for where it went.

If the inventory says one thing, the purchasing records say another, and the dispensing records tell a completely different story, that's when I start asking questions.

5. Excessive prescription reversals, voids, or reversals after pickup

Prescription reversals and voids happen. There are legitimate reasons for them, and I would never look at a reversal by itself and assume something improper happened.

What gets my attention is a pattern.

If I see an unusually high number of reversals or voids involving the same controlled substance, the same employee, or transactions occurring outside the pharmacy's normal workflow, I want to know what is causing them. I also want to know whether there is documentation supporting the reversal and whether the inventory was actually adjusted correctly.

A reversal after a prescription has reportedly been picked up is something I would look at particularly closely. At that point, I want to know what happened to the medication. Was the prescription actually picked up? Was it returned to stock? Was the inventory adjusted? Who processed the reversal? Was there communication with the patient? What does the transaction history show?

The pharmacy should be able to follow that transaction from the original prescription through the reversal and ultimately account for the medication. A reversal in the system doesn't make a controlled substance magically reappear on the shelf.

If the records say the prescription was picked up, but the system later shows a reversal and there is no documentation explaining what happened to the medication, that's a problem that needs to be investigated.

6. Inadequate receiving and invoice reconciliation

Controlled substance accountability starts the moment that shipment arrives at the pharmacy. If the pharmacy doesn't know exactly what it received, it becomes much harder to explain what happened to that inventory later.

When I review receiving procedures, I want to know who accepted the shipment, who actually counted the controlled substances, and whether the contents were compared against the invoice at the time of delivery. If something is short, damaged, backordered, or otherwise doesn't match the invoice, that discrepancy should be documented and addressed right away.

Don't assume the invoice is correct just because it came from the wholesaler. The pharmacy should have a process for verifying what was ordered against what was actually received. That includes reconciling invoices, credits, backorders, and damaged products and making sure any discrepancies are documented.

This may seem like a basic step, but it's an important one. If a pharmacy cannot reliably demonstrate what controlled substances came through the front door, it is going to have a much harder time accounting for what was dispensed, returned, transferred, destroyed, or remains in inventory.

You can't account for what you never properly documented receiving.

7. Weak access controls or shared credentials

If you can't tell who had access to your controlled substances or who performed a transaction in your system, you have an accountability problem.

Controlled substances should only be accessible to authorized personnel, and the systems used to order, receive, dispense, adjust, and document those substances should be set up so that individual actions can be traced back to the person who performed them.

Shared alarm codes, shared system credentials, unsecured keys, uncontrolled access to storage areas, or failing to remove someone's access after they leave the pharmacy all create unnecessary gaps in accountability.

When I'm reviewing access controls, I ask a pretty simple question: If something goes missing, can you tell me who had access to it?

Then I ask another one: Can you tell me who performed the transaction in your system?

If the answer to either question is "I'm not sure," that's a problem.

Everyone who has access to controlled substances doesn't have to be suspected of doing something wrong. The pharmacy should have controls in place that allow management to determine who had access and who performed a particular transaction if a discrepancy occurs.

Accountability starts with knowing who has access.

8. Employee behavior that bypasses established controls

Employee behavior can be an important piece of the puzzle, but it has to be looked at objectively. I don't believe in making assumptions about someone because of a rumor, a personality conflict, or one isolated incident. That's not an investigation.

What does get my attention is repeated behavior that doesn't follow established procedures.

For example, an employee who repeatedly resists inventory procedures, doesn't want to take time off, insists on working alone around controlled substances, shows an unusual interest in specific medications, or tries to bypass required witness procedures may warrant a closer look.

That doesn't mean the employee is diverting controlled substances. It means the behavior shouldn't simply be ignored.

The right response is to stick to the facts. Review the records. Preserve relevant documentation and surveillance. Follow your employment policies and established investigative procedures. If necessary, involve the appropriate management, HR, legal, or compliance personnel.

Don't investigate the employee's personality. Investigate the facts.

A fair, documented investigation protects the pharmacy and the employee. It also gives management an opportunity to identify a control weakness before it becomes a much bigger problem.

9. Poor documentation for returns, transfers, and destruction

Controlled substances don't stop being the pharmacy's accountability problem just because they are returned, transferred, damaged, expired, or set aside for destruction.

If the drug leaves the pharmacy's regular inventory, I still want to know where it went, when it went, how much was involved, who handled it, and what happened to it in the end.

This is an area where documentation matters.

When I review returns, transfers, and destruction records, I'm looking for the paperwork that supports the transaction and makes it possible to reconcile the inventory. That includes the controlled substance involved, the quantity, the date, the parties involved, and the final disposition.

Unexplained credits, incomplete reverse-distribution records, or transfers that don't have corresponding documentation can create a situation where the pharmacy can't account for controlled substances that should be accounted for.

And don't wait until a DEA inspection to start reconciling these transactions.

If the paperwork doesn't match the inventory, stop and figure out why.

A controlled substance shouldn't simply disappear from your records because it was returned, transferred, damaged, expired, or destroyed. There should be a documented trail showing what happened from beginning to end.

10. Failure to investigate and report significant loss or theft

Finding a possible loss or theft is not the point where the pharmacy's responsibility ends. That's where the investigation begins.

If a pharmacy identifies a potential loss, don't make an assumption about what happened and don't simply adjust the inventory and move on.

The pharmacy needs to determine what is actually missing, when the loss occurred, and whether the circumstances meet the criteria for a significant loss or theft. DEA registrants also need to understand and meet applicable reporting obligations.

This is where having a written process makes a difference.

When a potential loss is identified, the pharmacy should have a process for immediately verifying the inventory, preserving relevant records and surveillance, determining who had access, reviewing transaction history, escalating the issue to the appropriate management personnel, and documenting the investigation.

I would not wait until the end of the investigation to start thinking about reporting requirements. The facts need to be evaluated promptly so the pharmacy can determine what notifications, if any, are required.

A good investigation should answer some basic questions: What is missing? When did it go missing? Who had access? What records support what happened? What caused the loss? What are we doing to prevent it from happening again?

The goal isn't just to close out the discrepancy.

The goal is to understand what happened, correct the problem, and make sure the same problem doesn't happen again.

Turning indicators into a defensible response

Finding a warning sign is only the beginning. What matters is what the pharmacy does next.

If you identify a potential problem, don't wait weeks to start looking into it. Secure the affected inventory and preserve the records you may need to understand what happened. That can include physical counts, invoices, dispensing records, returns, transfers, adjustment history, access records, and available surveillance.

Then define the timeframe you're looking at and identify everyone who had access to the controlled substances or the systems involved.

Once you have the facts, work backward and figure out where the problem started.

A data-entry error may explain why one transaction is wrong, but it doesn't necessarily explain why nobody caught the error during the pharmacy's normal reconciliation process. A missing bottle may point to a receiving problem, an access-control issue, an inventory problem, or more than one breakdown in the process.

Don't just fix the number. Fix the reason the number is wrong.

Corrective action should address the actual problem. That could mean changing receiving procedures, restricting access, requiring independent counts, increasing management review of inventory adjustments, retraining employees, or increasing cycle counts for higher-risk controlled substances.

Whatever the corrective action is, document it - and then go back and make sure it actually worked.

A policy sitting in a binder doesn't protect a pharmacy if nobody follows it.

Build a review process before a discrepancy occurs

The best time to figure out how you're going to handle a controlled substance discrepancy is before you have one.

Routine oversight is much easier than trying to investigate a problem after the fact, especially when you're working under pressure to determine what happened.

The frequency of your reviews should make sense for your pharmacy. Volume, the types and quantities of controlled substances you handle, your staffing model, and your day-to-day operations should all be considered when deciding how often targeted reconciliations should be performed.

I also think an outside set of eyes can be valuable.

Sometimes you see the same process every day and stop noticing the things that aren't working. An independent review can help identify gaps that have become "normal" simply because that's the way the pharmacy has always done it.

That's where Veritas Compliance & Analytics comes in.

I help DEA registrants look at their controlled substance processes from an enforcement-informed perspective. I look beyond whether a policy exists on paper and focus on whether the pharmacy's records, procedures, and actual practices work together - and whether the pharmacy can demonstrate that during a DEA inspection.

The goal isn't to eliminate every possible discrepancy. That's not realistic.

The goal is to know when something doesn't look right, investigate it, correct the underlying problem, and be able to demonstrate that you took the issue seriously.

A controlled substance discrepancy doesn't have to turn into a major problem. If you ignore it, adjust the number without finding the cause, or fail to document what happened can turn a manageable issue into something much more difficult to explain later.

Know your numbers. Follow the records. Asks the questions.

That's how you build a controlled substance compliance program that actually works.