a Visit was considered cancer related if the principal diagnosis was coded as a malignant neoplasm (ICD-9 140 to 208). Radiologists and radiology clinics are not included in the survey samples and ambulatory visits to these providers are not represented.
b Percentages are adjusted using sampling weights to produce national estimates.
c In the Ninth Edition of the International Classification of Diseases (ICD-9): larynx, lung = 161, 162; female breast = 174; prostate = 185; colon, rectum = 153, 154; lymphomas, leukemias = 200-208; other = all other malignancies.
d Reason for visit is the most important patient complaint, symptom, or other reason given by the patient for the visit.
e Oncolytic therapy ordered, supplied, or administered during the visit including antineoplastics; hormonal or biological response modifiers; antimetabolites; antibiotics, alkaloids, or enzymes; or DNA-damaging drugs (National Drug Code Directory Drug Classes).
f Was patient referred for this visit by another physician?
SOURCE: USDHHS, 1999a, b.