Table 2 Code-based diagnostic algorithms

DA1

Aurum

• Any broad code in Aurum

DA2

Aurum and HES DID

• Any broad code in Aurum

and

• No other known causes of ILD recorded in Aurum^a

and

• Evidence of HRCT of thorax at any time in HES DID

DA3

Aurum

• Any narrow code in Aurum

DA4

Aurum and HES DID

• Any narrow code in Aurum

and

• No other known causes of ILD recorded in Aurum^a

and

• Evidence of HRCT of thorax at any time in HES DID

DA5

HES-APC

• ICD-10 codes J84.1, J84.8 or J84.9 as primary or secondary discharge diagnosis in any “episode” within a hospital spell

DA6

HES-APC and HES DID

• ICD-10 codes J84.1, J84.8 or J84.9 as primary or secondary discharge diagnosis in any “episode” within a hospital spell

and

• Evidence of HRCT of thorax at any time

DA7

Aurum and HES-APC

• Any broad code in Aurum

and

• ICD-10 codes J84.1, J84.8 or J84.9 as primary or secondary discharge diagnosis in any s “episodes” within a hospital spell

DA8

Aurum and HES-APC

• Any narrow code in Aurum

and

• ICD-10 codes J84.1, J84.8 or J84.9 as primary or secondary discharge diagnosis in any “episode” within a hospital spell