Table 1

ICD-9 codes and keywords used to identify potentially eligible STRONG transgender cohort members among KPGA, KPSC and KPNC members

ICD-9 diagnostic codesICD-9 V codes*+internal KP codesKeywords
302.5—trans-sexualism
302.50—trans-sexualism with unspecified sexual history (aka ‘trans-sexualism not otherwise specified’)
302.51—trans-sexualism with asexual history
302.52—trans-sexualism with homosexual history
302.53—trans-sexualism with heterosexual history
302.85—gender identity disorder in adolescents or adults
302.6—gender identity disorder in children
302.3—transvestic fetishism		V49.89+121141596—other conditions influencing health: transgender
V45.77+121141596—acquired absence of genital organs: history of sex reassignment surgery
V07.8+12124952—other specified prophylactic measure: male-to-female hormone supplementation
V07.8+12124310—other specified prophylactic measure: female-to-male hormone supplementation		’Transgender'
’Transsexual'
’Transvestite'
’Gender identity'
’Gender dysphoria'
’Gender reassignment'

  • *ICD-9 V codes are used for supplementary classification of factors influencing health status.40 41 As V codes may cover several conditions, they have to be used in conjunction with internal KP codes to ensure specificity.

  • ICD-9, International Classification of Diseases Ninth edition; KP, Kaiser Permanente; KPGA, Kaiser Permanente health plan located in Georgia; KPNC, Kaiser Permanente health plan located in Northern California; KPSC, Kaiser Permanente health plan located in Southern California; STRONG, Study of Transition, Outcomes and Gender.