ICD-10-CM G91.1 is the diagnosis code for Obstructive hydrocephalus. This code falls under the section "Other disorders of the nervous system" within Chapter 6 — Diseases of the nervous system (G00-G99). It is a billable/specific ICD-10-CM code that can be used to indicate a diagnosis for reimbursement purposes. Medical coders and healthcare providers use this code to document and classify diagnoses in electronic health records, insurance claims, and clinical databases.
Always refer to the official ICD-10-CM Tabular List for complete coding guidelines. Ensure documentation supports the specificity of the code selected. When in doubt, consult a certified medical coder or the latest CMS guidelines.
Understanding where G91.1 sits in the ICD-10-CM classification helps ensure proper coding:
Yes, G91.1 is a billable/specific ICD-10-CM code that can be used to indicate a diagnosis for reimbursement purposes.
G91.1 is the ICD-10-CM diagnosis code for "Obstructive hydrocephalus". It is used by healthcare providers to classify and document this condition in medical records and insurance claims.
The parent code of G91.1 is G91 ("Hydrocephalus"). G91.1 provides a more specific classification within this category.
G91.1 is located in Section G89-G99 — "Other disorders of the nervous system" within Chapter 6 of the ICD-10-CM Tabular List.
Use G91.1 when the patients documented diagnosis matches "Obstructive hydrocephalus" and the clinical documentation supports this level of specificity. Always verify with the latest ICD-10-CM guidelines and payer requirements.
The ICD-10-CM code for Obstructive hydrocephalus is G91.1.
Yes, G91.1 can be used as a primary diagnosis code since it is billable and specific.
G91.1 is in Chapter 6 of the ICD-10-CM Tabular List.
Yes, G91.1 is a valid ICD-10-CM code for the 2026 fiscal year, subject to official CMS updates.