Q03 vs Q07.0

Q03 (Congenital hydrocephalus) 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. Q03 carries an Excludes1 note covering Q07.0: “Arnold-Chiari syndrome, type II (Q07.0-)”

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

	Q03Congenital hydrocephalus	Q07.0Arnold-Chiari syndrome
Billing status	Non-billable header Report instead: Q03.0, Q03.1, Q03.8, Q03.9	Non-billable header Report instead: Q07.00, Q07.01, Q07.02, Q07.03
Classification	Q00-Q99 — Congenital Malformations, Deformations and Chromosomal Abnormalities (Q00-Q99)	Q00-Q99 — Congenital Malformations, Deformations and Chromosomal Abnormalities (Q00-Q99)
Definition	Congenital hydrocephalus is a non-billable ICD-10-CM category code (Q03).	Arnold-Chiari syndrome is a non-billable ICD-10-CM category code (Q07.0).
Includes	hydrocephalus in newborn	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