What ICD-10-CM code is assigned when a patient's blood test for HIV is inconclusive?

The appropriate ICD-10-CM code for an inconclusive HIV test result is R75. The R75 code specifically indicates that there is a "inconclusive laboratory evidence of human immunodeficiency virus [HIV]." This label is directly associated with the scenario of having an uncertain or ambiguous test result related to HIV status.

Utilizing R75 properly communicates the patient's condition in a standardized manner that healthcare providers understand and ensures accurate coding for reporting and billing purposes. Since the context of the question specifically involves a blood test that did not yield definitive results for HIV, R75 captures this situation accurately.

The other codes, R76, R77, and R78, do not correspond directly to inconclusive HIV test results and are classified for different purposes or diagnostic criteria. Hence, R75 stands out as the most appropriate and specific choice for this scenario.