Q07.00

Arnold-Chiari syndrome without spina bifida or hydrocephalus

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 Q07.0Arnold-Chiari syndrome
Excludes 1

Arnold-Chiari syndrome, type III (Q01.-) Arnold-Chiari syndrome, type IV (Q04.8)

Synonyms

Arnold-Chiari syndrome, type II

Inherited from Q07Other congenital malformations of nervous system
Excludes 2

congenital central alveolar hypoventilation syndrome (G47.35) familial dysautonomia [Riley-Day] (G90.1) neurofibromatosis (nonmalignant) (Q85.0-)

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

inborn errors of metabolism (E70-E88)

Official Guidelines for Q07.00

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

Sections that reference Q07.00

Sections whose FY 2026 text names Q07.00, its Q07 category, or a range containing it — the chapter guidance above is the authoritative source.

Find Q07.00 in the alphabetic index

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