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Answer: C - ICD-9-CM diagnosis codes for laboratory services are not limited to any chapter in the ICD-9-CM manual. In other words, any chapter may be used. Pathology and laboratory tests can sample many different types of specimens for many different conditions therefore almost any code from the ICD-9-CM manual may be appropriate. The reasons for these tests include, but are not limited to: identification of infectious organisms, the morphology of neoplasms, quantities of substances in the body and hormonal changes and imbalances, such as pregnancy status.