ICD-10-CM Code For Congenital Hydrocephalus: Group Overview

The International Classification of Diseases, Tenth Revision, Clinical Modification (ICD-10-CM) code group Q03 includes congenital hydrocephalus diagnoses characterized by abnormal accumulation of cerebrospinal fluid in the brain ventricles and related congenital malformations. These ICD-10-CM diagnosis codes are used to document congenital onset hydrocephalus cases, capturing anatomical involvement, presence of associated cerebral malformations, and clinical complexity relevant to pediatric and neurosurgical care. Accurate coding within the ICD-10-CM Q03 group supports proper claim adjudication, complete clinical documentation, and appropriate reimbursement.

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ICD-10-CM Q03: Congenital Hydrocephalus Overview

The ICD-10-CM Q03 code group represents congenital hydrocephalus, a developmental condition characterized by abnormal accumulation of cerebrospinal fluid within the ventricles of the brain. These diagnoses target the nervous system and congenital malformations identified at or shortly after birth. Accurate coding matters for complete clinical documentation and supports appropriate reimbursement for care related to neurosurgical and pediatric management.

When to Use

Use a code from this group when documenting hydrocephalus that is congenital in origin and identified in the prenatal, neonatal, or early pediatric period. Select the most specific code to reflect associated anomalies, laterality if provided, and any documented complications.

ICD-10-CM Codes

4 rows

ICD-10-CM Code	Description
Q03.0	Malformations of aqueduct of Sylvius
Q03.1	Atresia of foramina of Magendie and Luschka
Q03.8	Other congenital hydrocephalus
Q03.9	Congenital hydrocephalus, unspecified

DRG Codes

5 rows

DRG Code	Description
091	Other Disorders of Nervous System with MCC
092	Other Disorders of Nervous System with CC
093	Other Disorders of Nervous System without CC/MCC
791	Prematurity with Major Problems
793	Full Term Neonate with Major Problems

Typical Clinical Scenarios

A newborn delivered at 38 weeks is noted to have an increasing head circumference above the 98th percentile, bulging fontanelle, and poor feeding; cranial ultrasound confirms enlarged lateral ventricles consistent with congenital ventricular enlargement. The infant is admitted to neonatal neurosurgery for evaluation and monitoring, and a congenital hydrocephalus diagnosis is assigned based on imaging showing primary ventricular dilatation present at birth. Typical codes: Q03.0, Q03.9
A 6-month-old infant with a known neural tube defect presents for routine follow-up for progressive macrocephaly and developmental delay; MRI demonstrates obstructive aqueductal stenosis with ventricular enlargement attributed to the underlying congenital anomaly. The visit documents chronic, congenital hydrocephalus requiring ongoing neurosurgical management and developmental surveillance, so a congenital hydrocephalus code specific to the obstructive type is used. Typical codes: Q03.1, Q03.8
A 12-year-old child with a history of previously treated congenital hydrocephalus and ventriculoperitoneal shunt presents to the emergency department with headache, vomiting, and altered mental status; imaging shows shunt malfunction with recurrent ventricular dilation related to the congenital condition. The acute presentation is coded as an encounter for complications of the existing congenital hydrocephalus, using the congenital hydrocephalus code alongside procedure/complication coding as appropriate. Typical codes: Q03.9, Q03.8

ICD-10-CM Code For Anencephaly And Similar Malformations: Group Overview

Q01-ENCEPHALOCELE

ICD-10-CM Code For Encephalocele: Group Overview

Q02-MICROCEPHALY

ICD-10-CM Code For Microcephaly: Group Overview

Q04-OTHER-CONGENITAL-MALFORMATIONS-OF-BRAIN

ICD-10-CM Code For Other Congenital Malformations Of Brain: Group Overview

Q05-SPINA-BIFIDA

ICD-10-CM Code For Spina Bifida: Group Overview

Q06-OTHER-CONGENITAL-MALFORMATIONS-OF-SPINAL-CORD

ICD-10-CM Code For Other Congenital Malformations Of Spinal Cord: Group Overview

Q07-OTHER-CONGENITAL-MALFORMATIONS-NERVOUS-SYSTEM

ICD-10-CM Code For Other Congenital Malformations Of Nervous System: Group Overview

Frequently Asked Questions

References

1.CPT® Codes and Descriptions. AAPC. Retrieved Aug 11, 2026.Maintains the CPT code set's official descriptions and guidelines, licensed from the American Medical Association, used as the definitional source for CPT codes on this page.
2.HCPCS Quarterly Update. Centers for Medicare & Medicaid Services (CMS). Retrieved Aug 11, 2026.CMS's quarterly release of HCPCS Level II codes and short/long descriptors, the source for HCPCS code definitions and update history.
3.ICD-10-CM Full Code List. Centers for Medicare & Medicaid Services (CMS). Retrieved Aug 11, 2026.CMS's complete ICD-10-CM diagnosis code list, used to cross-reference diagnosis codes associated with this procedure or service.

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When to Use

ICD-10-CM Codes

4 rows

ICD-10-CM Code	Description
Q03.0	Malformations of aqueduct of Sylvius
Q03.1	Atresia of foramina of Magendie and Luschka
Q03.8	Other congenital hydrocephalus
Q03.9	Congenital hydrocephalus, unspecified

DRG Codes

5 rows

DRG Code	Description
091	Other Disorders of Nervous System with MCC
092	Other Disorders of Nervous System with CC
093	Other Disorders of Nervous System without CC/MCC
791	Prematurity with Major Problems
793	Full Term Neonate with Major Problems

Typical Clinical Scenarios

A newborn delivered at 38 weeks is noted to have an increasing head circumference above the 98th percentile, bulging fontanelle, and poor feeding; cranial ultrasound confirms enlarged lateral ventricles consistent with congenital ventricular enlargement. The infant is admitted to neonatal neurosurgery for evaluation and monitoring, and a congenital hydrocephalus diagnosis is assigned based on imaging showing primary ventricular dilatation present at birth. Typical codes: Q03.0, Q03.9
A 6-month-old infant with a known neural tube defect presents for routine follow-up for progressive macrocephaly and developmental delay; MRI demonstrates obstructive aqueductal stenosis with ventricular enlargement attributed to the underlying congenital anomaly. The visit documents chronic, congenital hydrocephalus requiring ongoing neurosurgical management and developmental surveillance, so a congenital hydrocephalus code specific to the obstructive type is used. Typical codes: Q03.1, Q03.8
A 12-year-old child with a history of previously treated congenital hydrocephalus and ventriculoperitoneal shunt presents to the emergency department with headache, vomiting, and altered mental status; imaging shows shunt malfunction with recurrent ventricular dilation related to the congenital condition. The acute presentation is coded as an encounter for complications of the existing congenital hydrocephalus, using the congenital hydrocephalus code alongside procedure/complication coding as appropriate. Typical codes: Q03.9, Q03.8

ICD-10-CM Code For Anencephaly And Similar Malformations: Group Overview

Q01-ENCEPHALOCELE

ICD-10-CM Code For Encephalocele: Group Overview

Q02-MICROCEPHALY

ICD-10-CM Code For Microcephaly: Group Overview

Q04-OTHER-CONGENITAL-MALFORMATIONS-OF-BRAIN

ICD-10-CM Code For Other Congenital Malformations Of Brain: Group Overview

Q05-SPINA-BIFIDA

ICD-10-CM Code For Spina Bifida: Group Overview

Q06-OTHER-CONGENITAL-MALFORMATIONS-OF-SPINAL-CORD

ICD-10-CM Code For Other Congenital Malformations Of Spinal Cord: Group Overview

Q07-OTHER-CONGENITAL-MALFORMATIONS-NERVOUS-SYSTEM

ICD-10-CM Code For Other Congenital Malformations Of Nervous System: Group Overview

Frequently Asked Questions

References

1.CPT® Codes and Descriptions. AAPC. Retrieved Aug 11, 2026.Maintains the CPT code set's official descriptions and guidelines, licensed from the American Medical Association, used as the definitional source for CPT codes on this page.
2.HCPCS Quarterly Update. Centers for Medicare & Medicaid Services (CMS). Retrieved Aug 11, 2026.CMS's quarterly release of HCPCS Level II codes and short/long descriptors, the source for HCPCS code definitions and update history.
3.ICD-10-CM Full Code List. Centers for Medicare & Medicaid Services (CMS). Retrieved Aug 11, 2026.CMS's complete ICD-10-CM diagnosis code list, used to cross-reference diagnosis codes associated with this procedure or service.

Published by

Trek Health powers OpenPayer with a leading commercial payer intelligence platform, seamlessly converting fragmented payer data into actionable insights for provider organizations.

ICD-10-CM Code For Congenital Hydrocephalus: Group Overview

Sign up for ICD-10-CM Code For Congenital Hydrocephalus: Group Overview policy alerts

ICD-10-CM Q03: Congenital Hydrocephalus Overview

ICD-10-CM Code For Congenital Hydrocephalus: Group Overview

Sign up for ICD-10-CM Code For Congenital Hydrocephalus: Group Overview policy alerts

ICD-10-CM Q03: Congenital Hydrocephalus Overview

When to Use

ICD-10-CM Codes

DRG Codes

Typical Clinical Scenarios

Related Codes

References

When to Use

ICD-10-CM Codes

DRG Codes

Typical Clinical Scenarios

Related Codes

References

ICD-10-CM Code For Congenital Hydrocephalus: Group Overview

Sign up for ICD-10-CM Code For Congenital Hydrocephalus: Group Overview policy alerts

ICD-10-CM Q03: Congenital Hydrocephalus Overview

ICD-10-CM Code For Congenital Hydrocephalus: Group Overview

Sign up for ICD-10-CM Code For Congenital Hydrocephalus: Group Overview policy alerts

ICD-10-CM Q03: Congenital Hydrocephalus Overview

When to Use

ICD-10-CM Codes

DRG Codes

Typical Clinical Scenarios

Related Codes

What does the ICD-10-CM Q03 group represent?

Which specific diagnosis codes are included in the Q03 group?

How does accurate coding within Q03 affect claims and documentation?

What related DRGs may be relevant when coding Q03 diagnoses?

When should a coder use `Q03.9` versus a more specific Q03 code?

References

When to Use

ICD-10-CM Codes

DRG Codes

Typical Clinical Scenarios

Related Codes

What does the ICD-10-CM Q03 group represent?

Which specific diagnosis codes are included in the Q03 group?

How does accurate coding within Q03 affect claims and documentation?

What related DRGs may be relevant when coding Q03 diagnoses?

When should a coder use `Q03.9` versus a more specific Q03 code?

References