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 Abnormal findings in cerebrospinal fluid==
 * R83.0 Abnormal level of enzymes in cerebrospinal fluid
 * R83.1 Abnormal level of hormones in cerebrospinal fluid
 * R83.2 Abnormal level of other drugs, medicaments and biological substances in cerebrospinal fluid
 * R83.3 Abnormal level of substances chiefly nonmedicinal as to source in cerebrospinal fluid
 * R83.4 Abnormal immunological findings in cerebrospinal fluid
 * R83.5 Abnormal microbiological findings in cerebrospinal fluid
 * Positive culture findings in cerebrospinal fluid
 * Excludes1: colonization status (Z22.-)
 * R83.6 Abnormal cytological findings in cerebrospinal fluid
 * R83.8 Other abnormal findings in cerebrospinal fluid
 * Abnormal chromosomal findings in cerebrospinal fluid
 * R83.9 Unspecified abnormal finding in cerebrospinal fluid

R84 Abnormal findings in specimens from respiratory organs and thorax

 * Includes: abnormal findings in bronchial washings
 * abnormal findings in nasal secretions
 * abnormal findings in pleural fluid
 * abnormal findings in sputum
 * abnormal findings in throat scrapings
 * Excludes1: blood-stained sputum (R04.2)
 * R84.0 Abnormal level of enzymes in specimens from respiratory organs and thorax
 * R84.1 Abnormal level of hormones in specimens from respiratory organs and thorax
 * R84.2 Abnormal level of other drugs, medicaments and biological substances in specimens from respiratory organs and thorax
 * R84.3 Abnormal level of substances chiefly nonmedicinal as to source in specimens from respiratory organs and thorax
 * R84.4 Abnormal immunological findings in specimens from respiratory organs and thorax
 * R84.5 Abnormal microbiological findings in specimens from respiratory organs and thorax
 * Positive culture findings in specimens from respiratory organs and thorax
 * Excludes1: colonization status (Z22.-)
 * R84.6 Abnormal cytological findings in specimens from respiratory organs and thorax
 * R84.7 Abnormal histological findings in specimens from respiratory organs and thorax
 * R84.8 Other abnormal findings in specimens from respiratory organs and thorax
 * Abnormal chromosomal findings in specimens from respiratory organs and thorax
 * R84.