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Compare/Q01 vs Q07.0

Q01 vs Q07.0

Q01 (Encephalocele) compared with Q07.0 (Arnold-Chiari syndrome), from the official CMS tabular data. Do not report these codes together: the official tabular list marks them Excludes1.

Can these codes be reported together?

No — do not report together. Q07.0 carries an Excludes1 note covering Q01: “Arnold-Chiari syndrome, type III (Q01.-)”

Sole exception: when the two conditions are documented as unrelated to each other (ICD-10-CM Official Guidelines, Section I.A.12.a).

Side by side

Q01EncephaloceleQ07.0Arnold-Chiari syndrome
Billing statusNon-billable header

Report instead: Q01.0, Q01.1, Q01.2, Q01.8, Q01.9

Non-billable header

Report instead: Q07.00, Q07.01, Q07.02, Q07.03

ClassificationQ00-Q99 — Congenital Malformations, Deformations and Chromosomal Abnormalities (Q00-Q99)Q00-Q99 — Congenital Malformations, Deformations and Chromosomal Abnormalities (Q00-Q99)
DefinitionEncephalocele is a non-billable ICD-10-CM category code (Q01).Arnold-Chiari syndrome is a non-billable ICD-10-CM category code (Q07.0).
Includes
Arnold-Chiari syndrome, type III
encephalocystocele
encephalomyelocele
hydroencephalocele
Arnold-Chiari syndrome, type II
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Derived from the official CMS ICD-10-CM tabular data (FY2026). Not billing advice; verify sequencing rules for the encounter. All data sources