Congenital hydrocephalus
In Congenital malformations of the nervous system (Q00-Q07), chapter 17: Congenital Malformations, Deformations and Chromosomal Abnormalities
4 billable codes under Q03: none are a CC or MCC; all map to HCC 182 (Spinal Cord Disorders/Injuries).An HCC counts toward a Medicare Advantage patient's risk score.
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Instructional notes
Includes: conditions that are coded here
- hydrocephalus in newborn
Excludes1: not coded here, use a different code
- Arnold-Chiari syndrome, type II (Q07.0-)
- acquired hydrocephalus (G91.-)
- hydrocephalus due to congenital toxoplasmosis (P37.1)
- hydrocephalus with spina bifida (Q05.0-Q05.4)
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.
Assign Q00-QA1 codes for documented congenital anomalies or genetic disorders at any age, coding non-inherent manifestations separately and sequencing Z38 first on the birth admission.
All codes under Q03
Q03 can't be used on a claim. Pick a billable code below; grey headings group them.
Q03 MS-DRGs
As the principal diagnosis, all 4 billable codes under Q03 group to MS-DRG 091, 092, 093, 791, or 793 (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 Q03
Notes on these codes point to Q03.
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.