R89.7Abnormal histological findings in specimens from other organs, systems and tissues

R89.7 is the ICD-10-CM diagnosis code for abnormal histological findings in specimens from other organs, systems and tissues. It belongs to category R89 (abnormal findings in specimens from other organs, systems and tissues), block R83-R89 (abnormal findings on examination of other body fluids, substances and tissues, without diagnosis) and chapter 18 (symptoms, signs and abnormal clinical and laboratory findings, not elsewhere classified). It is billable, so it can be reported on its own for dates of service from October 1, 2026 through September 30, 2027.

Within R89, choose R89.7 (Abnormal histological findings in specimens from other organs, systems and tissues) only when documentation doesn't support a more specific option: abnormal level of enzymes in specimens from other organs, systems and tissues (R89.0), abnormal level of hormones in specimens from other organs, systems and tissues (R89.1), abnormal level of other drugs, medicaments and biological substances in specimens from other organs, systems and tissues (R89.2), abnormal level of substances chiefly nonmedicinal as to source in specimens from other organs, systems and tissues (R89.3), abnormal immunological findings in specimens from other organs, systems and tissues (R89.4), abnormal microbiological findings in specimens from other organs, systems and tissues (R89.5), abnormal cytological findings in specimens from other organs, systems and tissues (R89.6), other abnormal findings in specimens from other organs, systems and tissues (R89.8) and 1 more.

It is not a CC or MCC, so as a secondary diagnosis it doesn't change the MS-DRG severity level.

In MS-DRG v44.0, it is part of the grouping logic for DRG 795 (Normal Newborn, relative weight 0.2022), DRG 947 (Signs and Symptoms with MCC, relative weight 1.261) and DRG 948 (Signs and Symptoms without MCC, relative weight 0.7835), in MDC 15 (Newborns and Other Neonates with Conditions Originating in the Perinatal Period) and MDC 23 (Factors Influencing Health Status and Other Contacts with Health Services), as a principal or secondary diagnosis. The DRG a claim lands in depends on the principal diagnosis, procedures and any CC/MCC secondary diagnoses.

It has been part of ICD-10-CM since the code set took effect on October 1, 2015 and hasn't changed since.

Before ICD-10, this condition was coded in ICD-9-CM as 792.9 (other nonspecific abnormal findings in body substances) and 795.4 (other nonspecific abnormal histological findings).