Table 1.

ICD-9CM codes used for diagnosable risk-factors investigated in the study population

Risk Factor	ICD9CM Code
OSSN	190.3, 224.3, 239.89
Tobacco use	305.1, v15.82, 649, 989.84, E869.4
BCC and SCC	173
Melanoma	172
Cancer (any type)	140–239
Actinic keratosis	702.0
Diabetes mellitus	250.0–250.9
Atopic eczema	691.8
HIV	795.71, V65.44, 079.53, v08, 042
HPV-related disease	078.1, V73.18, 079.4, 230.5, 230.6, 233.1, 233.31, 233.32, 569.44, 622.10, 622.11, 622.12, 623.0, 624.01, 624.02, 795.00–795.19, 796.7
Vitamin A deficiency	264, 264.7, 264.8
Pterygium	372.4

OSSN = ocular surface squamous neoplasia; BCC = basal cell carcinoma, SCC = squamous cell carcinoma, HIV = human immunodeficiency virus, HPV = human papilloma virus