What is ICD-10-AM (Australian Modification)?

ICD-10-AM (International Classification of Diseases, 10th Revision – Australian Modification) is Australia’s standardized clinical coding system used to classify diseases, health conditions, injuries, and related healthcare information. It is based on the World Health Organization’s (WHO) ICD-10 framework but has been enhanced to meet the specific documentation and reporting needs of the Australian healthcare system.

ICD-10-AM provides a structured method for assigning diagnosis codes to patient records. It helps healthcare organizations maintain accurate medical documentation, improve clinical reporting, support hospital funding, and generate reliable health statistics.

The classification system includes codes for:

• Diseases and medical conditions

• Signs and symptoms

• Injuries and trauma

• Poisoning and toxic effects

• Complications and adverse events related to healthcare

• Other conditions affecting patient care

Healthcare professionals use ICD-10-AM to ensure consistency, accuracy, and compliance in clinical coding across Australian hospitals and healthcare facilities.

What is ACHI?

ACHI (Australian Classification of Health Interventions) is Australia’s national coding system used to classify medical procedures and healthcare interventions performed during patient care. It complements ICD-10-AM by capturing the procedures carried out while treating patients.

ACHI is primarily based on the Australian Medicare Benefits Schedule (MBS) and is widely used in public hospitals, private hospitals, day surgery centres, and ambulatory healthcare services.

The classification covers a broad range of healthcare interventions, including:

• Surgical procedures

• Medical treatments

• Diagnostic and therapeutic interventions

• Dental procedures

• Allied health services

• Non-operating room interventions

The latest editions of ACHI continue to evolve to reflect modern clinical practice and healthcare requirements in Australia.

Key Features of ACHI

• Standardized numerical coding system

• Seven-character procedure codes

• Used throughout Australian healthcare facilities

• Supports hospital funding, clinical reporting, research, health planning, and statistical analysis

• Designed specifically to classify healthcare procedures rather than diseases or medical conditions

Unlike ICD-10-AM, ACHI focuses only on health interventions and procedures, not diagnoses or illnesses.

What is a Principal Diagnosis?

A Principal Diagnosis (PDx) is the main condition that is determined, after reviewing the complete medical record, to be primarily responsible for a patient’s admission to a healthcare facility.

Correctly identifying the principal diagnosis is one of the most important aspects of clinical coding because it directly affects coding accuracy, hospital reporting, funding, and healthcare data quality.

When assigning the principal diagnosis, coders must follow the Australian Coding Standards (ACS) along with the ICD-10-AM coding guidelines to ensure the selected diagnosis accurately represents the primary reason for the patient’s episode of care.