R00–R99
Symptoms, Signs and Abnormal Clinical and Laboratory Findings
Chest pain, fever, fatigue, abnormal lab results
R94.5
Abnormal results of liver function studies
Billable
R94.6
Abnormal results of thyroid function studies
Billable
R94.7
Abnormal results of other endocrine function studies
Billable
R94.8
Abnormal results of function studies of other organs and systems
Billable
R97
Abnormal tumor markers
Non-billable
R97.0
Elevated carcinoembryonic antigen [CEA]
Billable
R97.1
Elevated cancer antigen 125 [CA 125]
Billable
R97.2
Elevated prostate specific antigen [PSA]
Non-billable
R97.20
Elevated prostate specific antigen [PSA]
Billable
R97.21
Rising PSA following treatment for malignant neoplasm of prostate
Billable
R97.8
Other abnormal tumor markers
Billable
R99
Ill-defined and unknown cause of mortality
Billable
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