S36.021AMajor contusion of spleen, initial encounter

S36.021A is the ICD-10-CM diagnosis code for major contusion of spleen, initial encounter. It belongs to category S36 (injury of intra-abdominal organs), block S30-S39 (injuries to the abdomen, lower back, lumbar spine, pelvis and external genitals) and chapter 19 (injury, poisoning and certain other consequences of external causes). It is billable, so it can be reported on its own for dates of service from October 1, 2026 through September 30, 2027.

The 7th character "A" means initial encounter: use it while the patient is receiving active treatment for the condition.

As a secondary diagnosis it is a CC (complication or comorbidity), which can move an inpatient stay into the "with CC" MS-DRG of its family, unless the principal diagnosis excludes it.

In MS-DRG v44.0, it is part of the grouping logic for DRG 791 (Prematurity with Major Problems, relative weight 4.1075), DRG 793 (Full Term Neonate with Major Problems, relative weight 4.2195), DRG 814 (Reticuloendothelial and Immunity Disorders with MCC, relative weight 2.0729), DRG 815 (Reticuloendothelial and Immunity Disorders with CC, relative weight 1.0444), DRG 816 (Reticuloendothelial and Immunity Disorders without CC/MCC, relative weight 0.7381), DRG 963 (Other Multiple Significant Trauma with MCC, relative weight 2.6363) and 2 more, in MDC 15 (Newborns and Other Neonates with Conditions Originating in the Perinatal Period), MDC 16 (Diseases and Disorders of the Blood and Blood Forming Organs and Immunological Disorders) and MDC 24 (Multiple Significant Trauma), 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 865.01 (injury to spleen without mention of open wound into cavity, hematoma without rupture of capsule).