Chapter XVIII
Symptoms, signs and abnormal clinical and laboratory findings, not elsewhere classified
(R00-R99)

Abnormal findings on diagnostic imaging and in function studies, without diagnosis
(R90-R94)

Includes: nonspecific abnormal findings on diagnostic imaging by:
· computerized axial tomography [CAT scan]
· magnetic resonance imaging [MRI][NMR]
· positron emission tomography [PET scan]
· thermography
· ultrasound [echogram]
· X-ray examination
Excludes: abnormal findings on antenatal screening of mother ( O28.- )
diagnostic abnormal findings classified elsewhere - see Alphabetical Index

R90 Abnormal findings on diagnostic imaging of central nervous system
R90.0 Intracranial space-occupying lesion
R90.8 Other abnormal findings on diagnostic imaging of central nervous system
Abnormal echoencephalogram
White matter disease NOS

R91 Abnormal findings on diagnostic imaging of lung
Coin lesion NOS
Lung mass NOS

R92 Abnormal findings on diagnostic imaging of breast

R93 Abnormal findings on diagnostic imaging of other body structures
R93.0 Abnormal findings on diagnostic imaging of skull and head, not elsewhere classified
Excludes: intracranial space-occupying lesion ( R90.0 )
R93.1 Abnormal findings on diagnostic imaging of heart and coronary circulation
Abnormal:
· echocardiogram NOS
· heart shadow
R93.2 Abnormal findings on diagnostic imaging of liver and biliary tract
Nonvisualization of gallbladder
R93.3 Abnormal findings on diagnostic imaging of other parts of digestive tract
R93.4 Abnormal findings on diagnostic imaging of urinary organs
Filling defect of:
· bladder
· kidney
· ureter
Excludes: hypertrophy of kidney ( N28.8 )
R93.5 Abnormal findings on diagnostic imaging of other abdominal regions, including retroperitoneum
R93.6 Abnormal findings on diagnostic imaging of limbs
Excludes: abnormal finding in skin and subcutaneous tissue ( R93.8 )
R93.7 Abnormal findings on diagnostic imaging of other parts of musculoskeletal system
Excludes: abnormal findings on diagnostic imaging of skull ( R93.0 )
R93.8 Abnormal findings on diagnostic imaging of other specified body structures
Abnormal radiological finding in skin and subcutaneous tissue
Mediastinal shift

R94 Abnormal results of function studies
Includes: abnormal results of:
· radionuclide [radioisotope] uptake studies
· scintigraphy
R94.0 Abnormal results of function studies of central nervous system
Abnormal electroencephalogram [EEG]
R94.1 Abnormal results of function studies of peripheral nervous system and special senses
Abnormal:
· electromyogram [EMG]
· electro-oculogram [EOG]
· electroretinogram [ERG]
· response to nerve stimulation
· visually evoked potential [VEP]
R94.2 Abnormal results of pulmonary function studies
Reduced:
· ventilatory capacity
· vital capacity
R94.3 Abnormal results of cardiovascular function studies
Abnormal:
· electrocardiogram [ECG][EKG]
· electrophysiological intracardiac studies
· phonocardiogram
· vectorcardiogram
R94.4 Abnormal results of kidney function studies
Abnormal renal function test
R94.5 Abnormal results of liver function studies
R94.6 Abnormal results of thyroid function studies
R94.7 Abnormal results of other endocrine function studies
Excludes: abnormal glucose tolerance test ( R73.0 )
R94.8 Abnormal results of function studies of other organs and systems
Abnormal:
· basal metabolic rate [BMR]
· bladder function test
· splenic function test