Table 3.

Twenty Most Frequently Recorded ICD-9 Diagnosis Codes for Trial Participants^*,^†

Diagnosis Category	No. (%) of Participants
Hypertension, not otherwise specified	397 (47)
Tobacco use disorder	388 (46)
Depressive disorder, not elsewhere classified	361 (43)
Pain in limb	296 (35)
Chronic pain, not elsewhere classified	256 (30)
Lumbago	244 (29)
Cough	217 (26)
Hyperlipidemia, not elsewhere classified/not otherwise specified	207 (24)
Vaccine for influenza	201 (24)
Physical therapy, not elsewhere classified	195 (23)
Abdominal pain (unspecified site)	193 (23)
Chest pain, not otherwise specified	192 (23)
Viral Hepatitis C (unspecified without mention of hepatic coma)	187 (22)
Lack of housing	184 (22)
Diabetes mellitus (without mention of complication, type 2 or unspecified, not stated as controlled)	180 (21)
Esophageal reflux	179 (21)
Backache, not otherwise specified	175 (21)
Anxiety state, not otherwise specified	151 (18)
Palpitations	146 (17)
Acute upper respiratory infection, not otherwise specified	141 (17)

^*Diagnosis categories based on 2,927 distinct ICD-9 codes.

^†Based on data collected in the 2 years prior to study enrollment for 848 participants.

ICD-9, International Classification of Diseases Version 9.