VetMedGuide

Vet Med Guide

Companion animal in a veterinary practice workspace.
Practice2026-05-22 · 12 min read

DEA Biennial Inventory Workflow for Vet Practices

Step-by-step workflow for completing the DEA biennial controlled-substance inventory in a veterinary practice: opening inventory, exact counts, schedule separation, readily retrievable records.

Ran Chen
Ran Chen
Founder, VetMedGuide. Life-sciences operator and 10× global market-access lead.
Published

Every DEA-registered veterinary practice must take a complete physical inventory of all controlled substances on hand at least every two years. This is not optional, not delegable to a vendor, and not something you can skip because your daily logs look clean. The biennial inventory is a standalone regulatory event under 21 CFR 1304.11, and a DEA Diversion Investigator will ask to see it during any inspection.

This article walks through the biennial inventory as an operational workflow: what to prepare, how to count, what to document, where the common mistakes are, and what changes when your practice has multiple DEA-registered locations.

What the biennial inventory actually is

The DEA distinguishes between two types of inventory records:

  • The initial inventory. Taken on the day the registrant first engages in any controlled-substance activity — the day the first drug is received, not the day it is first dispensed (21 CFR 1304.11(b)).
  • The biennial inventory. A new, complete physical inventory of all controlled substances on hand, taken at least every two years after the initial inventory. The regulation reads that it "may be taken on any date which is within two years of the previous biennial inventory date" (21 CFR 1304.11(c)).

Daily-use logs, perpetual inventory counts, and automated dispensing records are not substitutes for the biennial inventory. The biennial is a separate, stand-alone document that must exist on its own. Missouri's Bureau of Narcotics and Dangerous Drugs puts it plainly: perpetual logs "do not replace the requirement to have a specific annual inventory document. Annual inventories must always be separate documents that stand-alone and are maintained separately."

Some states (Missouri, New York) require annual inventories rather than biennial. Check your state's requirements — you must follow whichever regulation is more stringent.

When to take the inventory

The biennial inventory may be taken on any date within two years of the previous one. That gives you flexibility, but it also creates a trap: if you miss the window, you are in violation.

Best practice is to set a fixed calendar date and repeat it. Pick a day that is operationally convenient — a Tuesday during a slower week, for example, not a Saturday during vaccine season. Mark it on the practice calendar and set a reminder at least two weeks in advance.

The inventory must be taken either at opening of business or at closing of business, and the document must state which. If your practice operates 24 hours (emergency or specialty), note the specific time the count was taken.

Who must be present

The DEA registrant — typically the practice owner or medical director — is responsible for the biennial inventory. The registrant may designate another person to conduct the count under Power of Attorney, but the registrant remains responsible for its accuracy.

Indiana's controlled-substance guidelines (which follow federal requirements) specify that biennial inventories must be conducted by the DEA registrant or their designee who has been granted Power of Attorney, along with an authorized witness. The Long Island Veterinary Medical Association's 2026 training materials recommend the same two-person protocol.

Practical recommendation: Always use two people. One counts, one records, and both sign. This reduces counting errors and provides a witness if the count is ever questioned.

Step 1: Prepare the controlled-substance storage area

Before counting, secure the area:

  1. Lock the cabinet or safe. No one should be accessing controlled substances during the count. If the practice is open, coordinate so that any needed drug is pulled before the count begins or the count is scheduled during a gap in procedures.
  2. Gather all containers. Pull every bottle, vial, and package from every storage location — the main safe, any backup stock, mobile unit supplies, and any controlled substances stored in a separate refrigerator. The DEA considers a substance "on hand" if it is "in the possession of or under the control of the registrant," including substances stored in a warehouse, in the possession of employees, or ordered but not yet invoiced (21 CFR 1304.11(a)).
  3. Separate by schedule. Schedule II containers must be counted separately from Schedule III–V containers. The two sets of records cannot be combined on the same inventory document.

Step 2: Count and record

For each container, record:

  • Drug name (generic and brand if applicable)
  • Dosage form (tablet, injectable, etc.)
  • Strength (e.g., 100 mg/mL, 10 mg tablet)
  • Number of commercial containers on hand
  • Number of dosage units in each container
  • NDC number
  • Lot number
  • Expiration date

Exact count vs. estimate

The DEA draws a line between Schedule I–II and Schedule III–V:

  • Schedule I and II: exact count. Every container must be physically counted or measured. No estimates are permitted. For multi-dose injectable vials, this means measuring the volume remaining — not guessing.
  • Schedule III–V: estimate is permitted. If the container holds more than 1,000 dosage units, an exact count is required. Otherwise, a reasonable estimate is acceptable. In a typical small-animal general practice, most Schedule III–V containers are small enough to estimate — but if you stock large bottles of tramadol or gabapentin, count them.

Texas's FY2025 Veterinary Enforcement Inspection Guide confirms this standard: for Schedule I–II, make an exact count; for Schedule III–V, estimate is permitted.

Step 3: Create the inventory document

The biennial inventory document must include:

  1. Practice name and DEA registration number
  2. Practice address (the address on the DEA registration)
  3. Date of the inventory
  4. Whether the count was taken at opening of business or closing of business
  5. For each controlled substance: name, strength, dosage form, and quantity on hand
  6. Signature of the person conducting the inventory (and witness, if applicable)

The document must be maintained in written, typewritten, or printed form at the registered location. If you use a digital controlled-substance system that generates a biennial report, print it and sign it. VetSnap's platform includes a biennial report function that pre-populates container data, but the registrant still must verify counts and sign the physical document.

Step 4: File and retain

File the biennial inventory separately from your daily-use logs. The DEA expects to see it as a distinct document.

Retention period: Minimum two years from the date of the inventory (21 CFR 1304.04(a)). However, multiple states require longer retention. California requires three years from the date of the animal's last visit, and the Long Island VMA's 2026 training recommends retaining five years of biennial inventories. AAHA's controlled-substance FAQ recommends keeping all records as long as you keep tax records, in calendar-year increments, if storage space permits.

Storage location: The biennial inventory must be maintained at the registered location — not at an offsite office, not at the owner's home, and not solely in a cloud account that requires internet access to retrieve. If you keep digital records, ensure you can produce a printed copy on demand during an inspection.

The readily retrievable standard

All controlled-substance records — including the biennial inventory — must be "readily retrievable." The DEA defines this in 21 CFR 1300.01(b): the record is "kept or maintained in such a manner that it can be separated out from all other records in a reasonable time" or "identified by an asterisk, redline, or some other identifiable manner such that it is easily distinguishable from all other records."

In practice, this means:

  • The biennial inventory is not buried in a general filing cabinet among invoice records.
  • Schedule II inventories are physically or electronically separated from Schedule III–V inventories.
  • A DEA investigator who asks to see your biennial inventory should receive it within minutes, not hours.

Multi-location traps

If your practice has multiple DEA-registered locations — for example, a main hospital and a satellite clinic, or a mobile unit with its own registration — the biennial inventory has additional requirements:

Separate registration, separate inventory

Each DEA-registered location requires its own biennial inventory (21 CFR 1301.12(a)). You cannot take a single combined inventory for two addresses, even if both are under the same practice ownership.

Mobile units

Under the Veterinary Medicine Mobility Act of 2014 (21 U.S.C. 822(e)(2)), veterinarians may transport controlled substances from their registered location to mobile treatment sites without obtaining a separate registration for each site. However, the controlled substances must be tracked as part of the inventory at the registered location. If your practice uses mobile veterinary units, the drugs on the truck must be counted as part of the registered location's biennial inventory.

Transfer between locations

Transferring controlled substances between registered locations requires documentation:

  • Schedule III–V: Transfer via invoice. Both the sending and receiving locations must log the transfer, and the invoice must include names, contact information, DEA registration numbers, drug name, strength, quantity, form, schedule, and date.
  • Schedule II: Transfer via invoice plus DEA Form 222. The receiving location must issue a DEA Form 222 to the sending location. Transfers are limited to no more than 10% of the practitioner's normal volume of normal drug inventory, per the California Veterinary Medical Board's controlled-substance guidelines.

Common multi-location mistakes

  • Counting drugs at Location A but filing the inventory at Location B. The inventory must be at the registered location.
  • Forgetting to include mobile-unit stock in the main location's count.
  • Taking the biennial inventory at different dates for different locations and losing track of which location is due. If you have multiple locations, stagger the dates and track them on a master calendar.

The biennial inventory vs. the running count

The biennial inventory is a snapshot — what was on hand at a specific moment. It is not the same as a running count, which is updated every time a drug is used, received, wasted, or destroyed.

Running counts are critical for daily operations and discrepancy detection, but they do not satisfy 21 CFR 1304.11. You need both:

  • A daily-use log (paper or digital) that tracks every transaction for every container.
  • A biennial inventory document that is a separate, signed, stand-alone physical count.

VetSnap's biennial count guide emphasizes this distinction: "While the longest amount of time 'allowed' may be two years, you really do not want to wait two years to find there is a large discrepancy that could have been caught and handled much sooner had there been more frequent physical counts." Monthly or quarterly physical counts — in addition to the biennial — are a best practice, not a DEA requirement.

What happens if you do not comply

DEA enforcement actions for biennial inventory violations are not theoretical. Titan Group's veterinary compliance analysis documents that the DEA has increased veterinary inspections, and that recordkeeping deficiencies — including missing or incomplete biennial inventories — are the most common finding.

Consequences range from a letter of admonition to civil fines (starting at approximately $19,000 per violation as of late 2025) to revocation of DEA registration. Without a valid DEA registration, the practice cannot legally possess, administer, or dispense controlled substances — which effectively shuts down surgical and pain-management services.

Texas's FY2025 Veterinary Enforcement Inspection Guide confirms that investigators are trained to review both the initial inventory (for registrants licensed fewer than two years) and the biennial inventory (for registrants licensed more than two years) as part of every inspection.

Checklist: biennial inventory workflow

Use this as a starting template and adapt it to your practice:

  • Confirm the due date (within two years of the previous biennial or initial inventory)
  • Verify state requirements (some states require annual, not biennial)
  • Schedule a date during a low-volume period
  • Assign two authorized team members (registrant or POA holder + witness)
  • Lock the controlled-substance cabinet/safe during the count
  • Gather all containers from all storage locations (main safe, backup, mobile units, refrigerator)
  • Separate Schedule II containers from Schedule III–V containers
  • Count or measure each container (exact count for Schedule II)
  • Record: drug name, strength, dosage form, quantity, NDC, lot, expiration
  • Note whether the count was opening of business or closing of business
  • Both team members sign and date the document
  • File separately from daily-use logs at the registered location
  • Retain for minimum two years (longer if state requires)
  • If using digital system, print the generated report, verify against physical count, and sign
  • Update the practice's controlled-substance compliance calendar for the next biennial due date

Sources

Topics
Clinic Workflow & Operations
Related Articles