Hydrocephalus
In Other disorders of the nervous system (G89-G99), chapter 6: Diseases of the Nervous System
7 billable codes under G91: 6 are a CC; all map to HCC 127 (Dementia, Mild or Unspecified).A CC or MCC (major CC) is a secondary diagnosis that raises the MS-DRG payment. An HCC counts toward a Medicare Advantage patient's risk score.
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Instructional notes
Official coding guidelines
From the ICD-10-CM Official Guidelines for Coding and Reporting, FY 2027 (CMS and NCHS). Links open the PDF at the right page.
Covers default dominant or nondominant side for hemiplegia and monoplegia, and use and sequencing of G89 pain codes, including postoperative, chronic, and neoplasm-related pain.
- Dominant/nondominant side (page 45)
- Pain - Category G89 (page 45)
All codes under G91
G91 can't be used on a claim. Pick a billable code below; grey headings group them.
G91 MS-DRGs
As the principal diagnosis, all 7 billable codes under G91 group to MS-DRG 056 or 057 (v44.0). Which one applies depends on procedures performed, secondary diagnoses (CC/MCC), and the patient's age and discharge status.
Other codes that refer to G91
Notes on these codes point to G91.
- Q03 Excludes1: acquired hydrocephalus (G91.-)
About the condition
Plain-language background from MedlinePlus (National Library of Medicine), not coding guidance.
Hydrocephalus
Hydrocephalus is the buildup of too much cerebrospinal fluid in the brain. Normally, this fluid cushions your brain. When you have too much, though, it puts harmful pressure on your brain.
Read more about hydrocephalus on MedlinePlusCode history
Valid since FY2016, when ICD-10-CM took effect on October 1, 2015. No changes since.