Free tools/Healthcare IT glossary
Plain-language definitions of 55 terms you will meet when choosing hospital software, from HL7 and FHIR to PACS, ICD-10 and eMAR, with a note on why each one matters to a buyer.
The events that record when a patient is admitted, moved between wards or beds, or discharged. ADT messages are usually the first thing other systems need from the hospital system.
Why it matters: Laboratory, pharmacy, billing and bed boards all depend on accurate ADT data.
A defined way for one piece of software to request data or actions from another.
Why it matters: Good APIs let you connect the hospital system to insurers, payment providers and reporting tools without custom file transfers.
A tamper-evident log of who viewed, created, changed or deleted each record and when.
Why it matters: It is central to data protection compliance and to investigating any suspected misuse of patient data.
Scanning the patient wristband and the medication barcode at the bedside to confirm the right patient, drug, dose, route and time before giving a dose.
Why it matters: It is one of the most effective ways to prevent medication administration errors.
Tracking which beds are occupied, clean, reserved or blocked, and matching incoming admissions to suitable beds.
Why it matters: It reduces emergency department crowding and speeds up discharge-to-admission turnaround.
An HL7 standard for structuring clinical documents such as discharge summaries so they can be exchanged and read by other systems.
Why it matters: Some national exchange programmes still use document-based exchange alongside FHIR.
Alerts, reminders and guidance shown to clinicians at the point of care, such as drug interaction warnings or overdue screening prompts.
Why it matters: Well-tuned decision support improves safety, while badly tuned alerts cause alert fatigue.
When an insurer or payer refuses to pay all or part of a submitted claim, often because of missing data, coding errors, authorisation gaps or eligibility problems.
Why it matters: Every denial costs staff time to fix, and some are never recovered.
Automated checks run on a claim before submission to catch missing fields, invalid codes and rule violations.
Why it matters: Cleaner claims mean fewer denials and faster payment.
Software for scheduling preventive maintenance, tracking work orders and recording repairs and calibrations for equipment.
Why it matters: Biomedical teams use it to keep equipment safe and to show inspectors maintenance history.
Entering medication, laboratory, imaging and other orders directly into the system rather than on paper.
Why it matters: It removes handwriting errors and allows safety checks at the moment an order is placed.
Moving records from an old system or paper files into a new system, including mapping fields, cleaning data and validating the result.
Why it matters: It is the most underestimated task in most implementations.
The requirement that certain data be stored, and sometimes processed, inside a particular country.
Why it matters: Some countries restrict where health data may be hosted, which affects your choice of cloud region.
The international standard for storing, sending and displaying medical images and their related information.
Why it matters: Imaging devices, PACS and viewers all rely on DICOM to work together.
The documented manual process staff follow when the system is unavailable, including paper forms and how data is entered afterwards.
Why it matters: A launch plan without downtime procedures is a risk to patient care.
A way of grouping inpatient cases with similar diagnoses and resource use so that payers can pay a set amount per group.
Why it matters: If your payers use DRG-style payment, the system must record the data needed to assign the group.
A longitudinal record of a patient's health across care settings and providers, designed to be shared.
Why it matters: People use EHR and EMR interchangeably, but an EHR implies information that travels with the patient.
The digital record of which medications were given to an inpatient, when, by whom and at what dose, including missed or refused doses.
Why it matters: It replaces the paper drug chart and supports barcode checking at the bedside.
The digital version of the chart kept by one provider or facility, including history, diagnoses, medications, results and notes.
Why it matters: It is the clinical core of a hospital or clinic system.
A single interaction between a patient and a provider or facility, such as an outpatient visit, an admission or a telehealth consultation.
Why it matters: Encounters are the unit around which clinical documentation and billing are organised.
A modern HL7 standard that exposes health data as web-friendly resources (such as Patient, Observation and Medication) over standard APIs.
Why it matters: It is the main standard for connecting apps, portals and national health exchanges.
The list of medicines a hospital, pharmacy or insurer approves for prescribing or reimbursement.
Why it matters: Prescribing alerts and claim rules often depend on formulary status.
The electronic sharing of patient information between organisations, either through a shared network or a central platform.
Why it matters: It lets a patient's records follow them between facilities.
An integrated system that covers a hospital's clinical, administrative and financial processes. Also called a hospital management system.
Why it matters: It brings registration, clinical care, pharmacy, laboratory and billing onto one record.
A widely used messaging standard in which systems send pipe-delimited messages, such as admissions, orders and results, to each other.
Why it matters: Most laboratory analysers and legacy hospital systems still speak HL7 v2.
A system for collecting and reporting aggregated health facility data for planning and monitoring, often for the ministry of health.
Why it matters: Facilities in many countries must report through a national HMIS regardless of their internal system.
The WHO classification used to code diagnoses for statistics, reporting and billing. Many countries use national modifications.
Why it matters: Insurers and health authorities usually require ICD-coded diagnoses on claims.
The current WHO classification, with more detail, digital-first design and a linkage to other terminologies.
Why it matters: Adoption is gradual, so many facilities need to support both ICD-10 and ICD-11 during the transition.
An initiative that publishes profiles describing how standards such as HL7 and DICOM should be combined for specific use cases.
Why it matters: IHE profiles help different vendors' systems work together in practice.
Middleware that receives, transforms and routes messages between systems, for example converting a laboratory analyser's output into records in the hospital system.
Why it matters: It keeps device and system connections manageable as the number of interfaces grows.
The ability of different systems to exchange data and use it meaningfully, both technically and semantically.
Why it matters: It decides whether your system can work with laboratories, insurers and national platforms.
Software that manages laboratory orders, sample tracking, analyser results, validation and reporting.
Why it matters: It connects the clinical record to the laboratory and reduces transcription errors.
A universal code system for laboratory tests and clinical observations.
Why it matters: It allows results from different laboratories to be compared and exchanged.
The record of medications given to a patient. When electronic, it is called an eMAR.
Why it matters: It is the legal record that a dose was given.
Comparing a patient's current medication list with new orders at admission, transfer and discharge to avoid omissions, duplications and interactions.
Why it matters: It is a recognised patient safety practice, and good systems support it directly.
Requiring more than a password to log in, such as a code from a phone app.
Why it matters: It sharply reduces the risk from stolen or guessed passwords.
A central index that gives each patient one unique identity and links duplicate or related records.
Why it matters: Duplicate patient records cause clinical and billing errors.
OPD covers patients who visit and go home the same day. IPD covers patients admitted to a bed overnight or longer.
Why it matters: The two flows have different documentation, billing and pharmacy needs, and good systems connect them.
A predefined group of orders, such as tests and medications, for a common condition or procedure that a clinician can select in one step.
Why it matters: Order sets speed up documentation and promote consistent care.
A system that stores, retrieves and displays medical images such as X-rays, CT and MRI scans.
Why it matters: It replaces film and lets clinicians view images from any authorised workstation.
A secure website or app where patients can see appointments, results, prescriptions and bills, and communicate with their provider.
Why it matters: It reduces phone calls and helps patients take part in their own care.
Any information that identifies a person and relates to their health, care or payment for care.
Why it matters: It is the data your security and privacy controls exist to protect.
Approval from an insurer, before a service is delivered, that it will be covered. Also called prior authorisation.
Why it matters: Missing pre-authorisation is a leading cause of denied claims.
Granting system permissions according to a person's job role rather than individually.
Why it matters: It keeps staff limited to the data they need and makes access reviews manageable.
The process of managing revenue from registration and eligibility through billing, claims, payment posting and follow-up of denials.
Why it matters: Strong RCM turns clinical activity into collected revenue.
Software that manages radiology orders, scheduling, worklists, reporting and billing, usually alongside a PACS.
Why it matters: It coordinates the imaging workflow around the images themselves.
Software delivered over the internet on a subscription, with the vendor hosting and maintaining it.
Why it matters: It reduces upfront hardware cost but makes connectivity and data hosting terms important.
A comprehensive clinical terminology used to code diagnoses, findings, procedures and more in a consistent way.
Why it matters: It supports detailed clinical data capture and analytics beyond what billing codes allow.
A standard structure for clinical notes: what the patient reports, what the clinician observes, the assessment and the plan.
Why it matters: Structured notes are easier to read, search and analyse.
Letting users log in once to access several systems.
Why it matters: It simplifies access management in larger organisations.
Delivering care remotely using video, audio or messaging.
Why it matters: It should link to the appointment and the medical record so notes and billing are not duplicated.
An organisation that processes claims and manages benefits on behalf of an insurer or employer.
Why it matters: In many markets, claims go to a TPA rather than directly to the insurer.
Sorting patients by urgency so the sickest are seen first.
Why it matters: Electronic triage supports queue prioritisation and emergency department flow.
Testing by the actual future users, using real scenarios, before a system goes live.
Why it matters: It finds workflow problems that technical testing misses.
A prepared list of tasks for a user or device, such as pending laboratory samples or scheduled imaging studies.
Why it matters: It replaces manual re-entry and reduces errors, for example in imaging with the modality worklist.
HL7 is the organisation that publishes the standards. HL7 v2 is an older, message-based standard that is still widely used inside hospitals. FHIR is the newer standard based on web APIs and is the main choice for new integrations and patient-facing apps.
An EMR is the digital chart within one facility. An EHR is intended to follow the patient across facilities and providers. In practice many vendors use the terms interchangeably, so ask what a product does rather than what it is called.
Not always. Small facilities may only need a simple image viewer. A full PACS becomes valuable once you have digital modalities, multiple viewing locations or a radiologist reading remotely.
At minimum, the diagnosis coding your payers and health authorities require, usually ICD-10 or a national variant. LOINC for laboratory tests and SNOMED CT become important as you exchange data with other organisations.
Tell us which acronym a vendor used that you could not find, and we will add it.