Table 1 Administrative database codes used in predictive model

Chronic sinusitis

J32

473

Therapeutic Interventions on the Ethmoidal Sinus

1.EU.^^.^^

Chronic maxillary sinusitis

J32.0

473.0

Drainage, ethmoidal sinus

1.EU.52.^^

Chronic frontal sinusitis

J32.1

473.1

Excision partial, ethmoidal sinus

1.EU.87.^^

Chronic ethmoidal sinusitis

J32.2

473.2

Therapeutic Interventions on the Sphenoidal Sinus

1.EV.^^.^^

Chronic sphenoidal sinusitis

J32.3

473.3

Drainage, sphenoidal sinus

1.EV.52.^^

Chronic pansinusitis

J32.4

N/A

Excision partial, sphenoidal sinus

1.EV.87.^^

Other chronic sinusitis

J32.8

473.8

Therapeutic Interventions on the Maxillary Sinus

1.EW.^^.^^

Chronic sinusitis, unspecified

J32.9

473.9

Excision partial, sphenoidal sinus

1.EV.87.^^

Nasal polyp

J33

471

Therapeutic Interventions on the Maxillary Sinus

1.EW.^^.^^

Polyp of nasal cavity

J33.0

471.0

Drainage, maxillary sinus

1.EW.52.^^

Polypoid sinus degeneration

J33.1

471.1

Therapeutic Interventions on the Frontal Sinus

1.EX.^^

Other polyp of sinus

J33.8

471.8

Drainage, frontal sinus

1.EX.52.^^

Nasal polyp, unspecified

J33.9

471.9

Destruction, frontal sinus

1.EX.59.^^

Repair, frontal sinus

1.EX.80.^^

Excision partial, frontal sinus

1.EX.87.^^

Therapeutic Interventions on the Paranasal Sinuses

1.EY.^^.^^

Excision partial, paranasal sinuses

1.EY.87.^^

Excision radical, paranasal sinuses

1.EY.91.^^