Technical notes

National Health Survey

The National Health Survey (NHS) uses three factors to determine whether or not a person is counted as having a particular condition: whether the condition is current, whether it is long term and whether it was medically diagnosed. The combination of these factors required for a person to count as having the condition varies according to nature of the condition. For example, some conditions, such as diabetes and HSVD, once diagnosed, are seen to be lifelong. Even if a person no longer reports symptoms, they still count as having the condition. While other conditions, such as depression, asthma, cancer or back problems, can be lifelong, episodic or in complete remission.

Most conditions do not need the respondent to have been diagnosed by a doctor or nurse. The respondent is counted if they said they have the condition. However, in cases where the respondent said they had diabetes or HSVD and that the condition was not current, they need to have received a diagnosis to be counted.

Table 1: Definitions used for chronic conditions
Condition Current Long term Has the condition been diagnosed by a doctor or nurse?

Arthritis

current

long term

no diagnosis required

Asthma

current

long term

no diagnosis required

Back problems

current

long term

no diagnosis required

Cancer

current

long term

no diagnosis required

COPD

current

long term

no diagnosis required

Diabetes

(2 combinations)

current

long term

no diagnosis required

ever had

not long term

diagnosis required

Heart, stroke and vascular disease (HSVD)

(2 combinations)

current

long term

no diagnosis required

ever had

not long term

diagnosis required

Kidney disease

current

long term

no diagnosis required

Mental and behavioural conditions

current

long term

no diagnosis required

Osteoporosis

current

long term

no diagnosis required

Note: Please see the 2017-18 NHS User Guide for more information on the definitions of the conditions.

National Hospital Morbidity Database

Chronic conditions in the AIHW National Hospital Morbidity Database (NHMD) are identified based on codes from the ICD-10-AM. Procedures are identified based on ACHI codes. For this report, the codes used can be found in Table 2 to Table 4 below. For NHMD analysis, hospitalisations for which the care type was reported as Newborn (without qualified days), and records for Hospital boarders and Posthumous organ procurement have been excluded.

Table 2. ICD-10-AM codes used in identifying chronic conditions in the AIHW National Hospital Morbidity Database
MSK condition ICD-10-AM 10th edition codes Definition/description

Arthritis

M05–M06

Rheumatoid arthritis

 

M15–M19

Osteoarthritis

Back Pain

M40-43

Deforming Dorsopathies

 

M45-51

Spondylopathies/other dorsopathies

 

M53-54

Other dorsopathies

 

M99

Biomechanical lesions, not elsewhere classified

Gout

M10

Gout

Osteoarthritis

M15

Polyarthrosis

 

M16

Coxarthrosis [arthrosis of hip]

 

M17

Gonarthrosis [arthrosis of knee]

 

M18

Arthrosis of first carpometacarpal joint

 

M19

Other arthrosis

Osteoporosis

M80

Osteoporosis with pathological fracture

 

M81

Osteoporosis without pathological fracture

 

M82

Osteoporosis in diseases classified elsewhere

Table 3. ICD-10-AM codes used in identifying minimal trauma fractures in the AIHW National Hospital Morbidity Database
MSK condition

ICD-10-AM 10th edition codes

Definition/description

Minimal trauma fractures

Hip fracture

S72.0

Fracture of neck of femur

 

S72.1

Pertrochanteric fracture

 

S72.2

Subtrochanteric fracture

Shoulder and upper arm fracture

S42

Fracture of shoulder and upper arm

Lower leg including ankle fracture

S82

Fracture of lower leg, including ankle

Lumbar spine and pelvis fracture

S32

Fracture of lumbar spine and pelvis

Forearm fracture

S52

Fracture of forearm

Fractures (all)

S02

Fracture of skull and facial bones

 

S12

Fracture of neck

 

S22

Fracture of rib(s), sternum and thoracic spine

 

S32

Fracture of lumbar spine and pelvis

 

S42

Fracture of shoulder and upper arm

 

S52

Fracture of forearm

 

S62

Fracture at wrist and hand level

 

S72

Fracture of femur

 

S82

Fracture of lower leg, including ankle

 

S92

Fracture of foot, except ankle

 

T02

Fractures involving multiple body regions

 

T08

Fracture of spine, level unspecified

 

T10

Fracture of upper limb, level unspecified

 

T12

Fracture of lower limb, level unspecified

With an external cause of:

Minimal trauma falls

W00

Fall on same level involving ice and snow

 

W01

Fall on same level from slipping, tripping and stumbling

 

W03

Other fall on same level due to collision with, or pushing by, another person

 

W04

Fall while being carried or supported by other persons

 

W05–W08

Fall involving wheelchair; bed; chair; other furniture

 

W18

Other fall on same level

 

W19

Unspecified fall

Other minimal trauma events

W22

Striking against or struck by other objects

 

W50

Hit, struck, kicked, twisted, bitten or scratched by another person

 

W51

Striking against or bumped into by another person

 

W54.8

Other contact with dog

Table 4. The Australian Classification of Health Interventions (ACHI) codes 10th edition codes used in identifying total knee and hip replacement in the AIHW National Hospital Morbidity Database
MSK surgery ACHI 10th edition codes
Total knee replacement

4951700, 4951800, 4951900, 4953401,
4952100, 4952101, 4952102, 4952103,
4952400 and 4952401

Total hip replacement 4931800 and 4931900