Q04.5

Megalencephaly

Risk-adjusting (HCC)Billable code

HCC risk adjustment mapping

CMS-HCC V28

HCC182

Spinal Cord Disorders/Injuries

CMS-HCC ESRD V24

HCC72

Spinal Cord Disorders/Injuries

RxHCC V08

RXHCC155

Spinal Cord Disorders

Coding notes

Excludes 1 never coded together · Excludes 2 may co-exist

Inherited from Q04Other congenital malformations of brain
Excludes 1

cyclopia (Q87.0) macrocephaly (Q75.3)

Inherited from chapter 17Congenital malformations, deformations and chromosomal abnormalities
Excludes 2

inborn errors of metabolism (E70-E88)

Note

Codes from this chapter are not for use on maternal records

Official Guidelines for Q04.5

FY 2026 ›
I.C.17Chapter-specific guidanceChapter 17: Congenital malformations, deformations, and chromosomal abnormalities (Q00-QA1)

Sections that reference Q04.5

Sections whose FY 2026 text names Q04.5, its Q04 category, or a range containing it — the chapter guidance above is the authoritative source.

Find Q04.5 in the alphabetic index

2 index paths lead to this code