Table 1.

Patterns of diagnoses (ICD-10) for relevant medical conditions and ATC for relevant prescriptions

Indications/diagnoses/drugs	ICD-10/ATC codes
Approved indications*
Epilepsy	G40; G41
Generalised anxiety disorders	F41.1
Neuropathic pain-related diagnoses	G35.9; G50.0; G50.1; G51.0; G53.0; G54.4; G54.6; G55.0; G55.1; G56.0; G56.2; G56.4; G56.9; G57.0; G57.1; G57.8; G57.9; G58.0; G58.7; G58.8; G62.9; G63.2; G82.1; G95.0; G95.2; G95.8; G97.9; I69.1; I69.3; M48.0; M50.1; M53.0; M53.1; M54.1; M54.3; M54.4; M79; M89.0; R52
Additional neuropathic pain-related diagnoses (broad pattern)	B02; G13.0; G52.1; G56; G57; G58; G59; G60; G61; G62; G63; G99.0; M51.1; M54.2; T92.6; T93.6
Substance use disorders†	F11–F19; T42; T43; Z71.4–5
Addictive disorder drugs‡
Alcohol	N07BB
Tobacco	N07BA
Opioids	N07BC
Drugs with potential for abuse‡
Opioids	N02A
Psychostimulants	N06B
Benzodiazepines	N05B; N05C
Contemporaneous prescription of gabapentin§	N03AX12

*Diagnoses during the same quarter as the initial prescription.

†At least one diagnosis in two different quarters during the year before the initial prescription.

‡At least one prescription during the year before the initial prescription.

§At least one prescription during the observation period of 1 year.

ATC, Anatomical Therapeutic Chemical; ICD-10, International Classification of Diseases 10th Revision.