All ICD10 Codes
Q04Not billable, use a more specific code below

Other congenital malformations of brain

In Congenital malformations of the nervous system (Q00-Q07), chapter 17: Congenital Malformations, Deformations and Chromosomal Abnormalities

9 billable codes under Q04: 4 are an MCC, 4 are a CC; all map to HCC 182 (Spinal Cord Disorders/Injuries).A CC or MCC (major CC) is a secondary diagnosis that raises the MS-DRG payment. An HCC counts toward a Medicare Advantage patient's risk score.

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Instructional notes

Excludes1: not coded here, use a different code

Official coding guidelines

From the ICD-10-CM Official Guidelines for Coding and Reporting, FY 2027 (CMS and NCHS). Links open the PDF at the right page.

Assign Q00-QA1 codes for documented congenital anomalies or genetic disorders at any age, coding non-inherent manifestations separately and sequencing Z38 first on the birth admission.

Read Section I.C.17 (page 74)

All codes under Q04

Q04 can't be used on a claim. Pick a billable code below; grey headings group them.

Q04 MS-DRGs

As the principal diagnosis, all 9 billable codes under Q04 group to MS-DRG 091, 092, 093, 791, or 793 (v44.0). Which one applies depends on procedures performed, secondary diagnoses (CC/MCC), and the patient's age and discharge status.

About the condition

Plain-language background from MedlinePlus (National Library of Medicine), not coding guidance.

Brain Malformations

Most brain malformations begin long before a baby is born. Something damages the developing nervous system or causes it to develop abnormally. Sometimes it's a genetic problem. In other cases, exposure to certain medicines, infections, or radiation during pregnancy interferes with brain development. Parts of the brain may be missing, abnormally small or large, or not fully developed.

Read more about brain malformations on MedlinePlus

Code history

Valid since FY2016, when ICD-10-CM took effect on October 1, 2015. No changes since.