ICD-10-CM > R00-R99 > R70-R79 > R76 R76 Other abnormal immunological findings in serum Non-Billable/Non-Specific Codes R76.0Raised antibody titerR76.1Nonspecific reaction to test for tuberculosisR76.11Nonspecific reaction to tuberculin skin test without active tuberculosisR76.12Nonspecific reaction to cell mediated immunity measurement of gamma interferon antigen response without active tuberculosisR76.8Other specified abnormal immunological findings in serumR76.81Abnormal rheumatoid factor and anti-citrullinated protein antibody without rheumatoid arthritisR76.89Other specified abnormal immunological findings in serumR76.9Abnormal immunological finding in serum, unspecified