What Is GMDN?
The Global Medical Device Nomenclature (GMDN, used as reference only) is an internationally recognised system for naming and classifying medical devices. Maintained by the GMDN Agency (reference), it contains over 25,000 device type definitions — each with a unique five-digit code, a precise definition, and a set of synonyms and related terms.
Device type classification is the healthcare equivalent of a DCIM device type library. Just as NetBox's device type library provides a universal vocabulary for IT equipment — "Dell PowerEdge R640" means the same thing to every data centre engineer — Device type classification provides a universal vocabulary for medical equipment. "Ventilator, intensive care" (device type 34938) means the same thing to every biomedical engineer, every CMMS platform, and every regulatory body.
Why Device Type Classification Matters for Asset Registers
Healthcare asset registers are built without a shared vocabulary. One biomedical engineer records a device as "ventilator". Another records it as "vent". A third records it as "resp support unit". A fourth records the manufacturer's model name — "HAMILTON-C6" — without any category information at all.
The result is a dataset where the same device type appears under dozens of different names, making it impossible to:
Count how many ventilators are on site (because the query "WHERE description = 'ventilator'" misses all the variants)
Schedule preventive maintenance by device category (because the category field is inconsistent)
Report equipment inventory to regulators (because the regulatory reporting templates require standardised device type names)
Benchmark against peer institutions (because benchmarking requires a common vocabulary)
device type classification resolves all four problems. Once every device in the register has a device type code, you can count ventilators by querying for device type 34938, schedule maintenance by device type category, report to regulators using the standard nomenclature, and benchmark against institutions using the same codes.
How Device Type Codes Are Assigned
There are three methods for assigning device type codes to an existing asset register.
FDA UDI lookup is the most reliable method for medical devices sold in the US market. Every device with a UDI barcode has a corresponding record in the FDA's Global Unique Device Identification Database (GUDID), which includes the device type code. Struktive cross-references each asset's UDI against GUDID to retrieve the device type code automatically.
GMDN Agency (reference) database search is the fallback for devices without a UDI, or for devices sold outside the US market. The GMDN Agency (reference)'s public database can be searched by manufacturer name, device description, or synonym. The search returns candidate device type codes ranked by relevance.
Machine learning classification uses the combination of manufacturer name, model name, and description to predict the most likely device type code. This method is less reliable than UDI lookup but more scalable for large registers where UDI barcodes are not available. Struktive uses this method for records that cannot be resolved by the first two methods, and flags them for manual review.
Device Type Classification in Practice: What Changes After Classification
Once your asset register is device-type-classified, three things become possible that were not possible before.
Accurate maintenance scheduling — instead of scheduling maintenance by free-text device type, you schedule by device type category. All ventilators (device type 34938) get the same maintenance schedule. All infusion pumps (device type 13089) get the same maintenance schedule. The schedule is driven by the device category, not by the inconsistent descriptions in the source data.
Regulatory compliance reporting — CQC inspections, MHRA audits, and HTM compliance reports all require accurate equipment counts by device category. With device type codes in your CMMS, generating these reports is a query, not a manual exercise.
Benchmarking — device type codes enable meaningful benchmarking against peer institutions. If you know you have 42 ventilators (device type 34938) per 100 ICU beds, and the benchmark for comparable institutions is 38, that is an actionable insight. Without device type codes, the comparison is impossible because every institution uses different terminology.