QA0.0109 ICD-10-CM Code: Neurodevelopmental disorder related to pathogenic variant in other ion channel gene
HCC Buddy Code Card
Digital ICD-10 code-book layout with official code detail, always-visible risk models, Code Trumping, and Buddy coding guidance.
FY 2026 Apr update / Congenital malformations, deformations and chromosomal abnormalities (Q00-QA0) / Genetic disorders, not elsewhere classified (QA0)
QA0.0109
Billable / SpecificICD-10-CMOfficial ICD-10-CMCodebook guidanceNeurodevelopmental disorder related to pathogenic variant in other ion channel gene
A developmental disorder caused by mutations in ion channel genes other than SCN2A or CACNA1A, affecting how electrical signals are transmitted in nerve cells.
CMS-HCC V28
N/A—
Not mapped
CMS-HCC V24
N/A—
Not mapped
ACA/HHS
MappedHCC 97
Varies by metal level
ESRD/PACE
N/A—
Not mapped
RXHCC
N/A—
Not mapped
Code Book Path
Inclusion Terms
Official- SCN8A-related neurodevelopmental disorder
Excludes 2
OfficialICD-10-CM does not list Excludes 2 notes for QA0.0109 in this effective period.
Related Child Codes
Includes
OfficialICD-10-CM does not list Includes notes for QA0.0109 in this effective period.
Excludes 1
OfficialICD-10-CM does not list Excludes 1 notes for QA0.0109 in this effective period.
Code First
OfficialICD-10-CM does not list Code First sequencing instructions for QA0.0109 in this effective period.
Use Additional
OfficialICD-10-CM does not list Use Additional Code instructions for QA0.0109 in this effective period.
Code Also
OfficialICD-10-CM does not list Code Also instructions for QA0.0109 in this effective period.
Buddy Documentation Tip
Last updated: FY2026 ICD-10-CM Apr update, Apr 1, 2026 through Sep 30, 2026. CMS-HCC V28 is 100% phased in for payment year 2026.
Is QA0.0109 an HCC code?
No. QA0.0109 is a billable ICD-10-CM code but does not map to any HCC category in V28, V24, ESRD, or RxHCC.
Coder workflow notes
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This code does not map to an HCC category in any model (V28, V24, ESRD, RxHCC).
What This Code Means
QA0.0109 is the ICD-10-CM diagnosis code for neurodevelopmental disorder related to pathogenic variant in other ion channel gene. A developmental disorder caused by mutations in ion channel genes other than SCN2A or CACNA1A, affecting how electrical signals are transmitted in nerve cells. QA0.0109 sits in the ICD-10-CM chapter for congenital malformations, deformations and chromosomal abnormalities (q00-qa0), within the section covering genetic disorders, not elsewhere classified (qa0).
QA0.0109 is a billable ICD-10-CM code but does not map to a payment HCC under the CMS-HCC V28, V24, ESRD, or RxHCC risk adjustment models. It can be reported on Medicare Advantage encounter data submissions but it does not contribute to a beneficiary's RAF score and therefore does not affect risk-adjusted payments to the plan.
Document the specific ion channel gene involved in the medical record for clarity.
HCC Buddy maintains structured V28 and V24 mapping, RAF weights, and MEAT documentation criteria for QA0.0109 sourced directly from the CMS-HCC risk adjustment model files and the CMS ICD-10-CM code set.
Coding Tips
- •Document the specific ion channel gene involved in the medical record for clarity
- •Use this code when the ion channel gene is identified but does not fit other specific QA0.01 subcategories