ICD-10 code for aqueduct of Sylvius occlusion

The ICD-10-CM code for aqueduct of Sylvius occlusion is G91.1 (Obstructive hydrocephalus). The official index lists 1 more specific code, so check the documentation for details such as type, cause, site or severity before settling on G91.1.

Within G91 (hydrocephalus), G91.1 is specifically for obstructive hydrocephalus. Related codes cover communicating hydrocephalus (G91.0), (Idiopathic) normal pressure hydrocephalus (G91.2), post-traumatic hydrocephalus, unspecified (G91.3), in diseases classified elsewhere (G91.4), other hydrocephalus (G91.8) and unspecified (G91.9).

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 056 (Degenerative Nervous System Disorders with MCC, relative weight 2.2655) and DRG 057 (Degenerative Nervous System Disorders without MCC, relative weight 1.2838), in MDC 01 (Diseases and Disorders of the Nervous System), as a principal or secondary diagnosis. The DRG a claim lands in depends on the principal diagnosis, procedures and any CC/MCC secondary diagnoses.