Short answer · Medically reviewed summary · Last updated: 2026-05-08
Neurodegeneration with Brain Iron Accumulation (NBIA) is an umbrella term for a group of rare, progressive neurological disorders rather than a single diagnosis, which is why it does not have one exclusive ICD-10 or ICD-9 code. Clinicians typically use the ICD-10 code G23.0 (Hallervorden-Spatz disease) or G23.8 (other specified degenerative diseases of basal ganglia) to classify Neurodegeneration with Brain Iron Accumulation, while the corresponding ICD-9 code is 333.0. Why are there no specific ICD codes for every subtype of NBIA? Because Neurodegeneration with Brain Iron Accumulation encompasses at least ten distinct genetic subtypes, such as PKAN (Pantothenate Kinase-Associated Neurodegeneration) and PLAN (PLA2G6-Associated Neurodegeneration), coding is often based on the specific gene mutation identified.
ICD10 code of Neurodegeneration with Brain Iron Accumulation and ICD9 code
ICD-10 and ICD-9 codes for Neurodegeneration with Brain Iron Accumulation, with classification details for clinicians, coders and patients.
Neurodegeneration with Brain Iron Accumulation (NBIA) is an umbrella term for a group of rare, progressive neurological disorders rather than a single diagnosis, which is why it does not have one exclusive ICD-10 or ICD-9 code. Clinicians typically use the ICD-10 code G23.0 (Hallervorden-Spatz disease) or G23.8 (other specified degenerative diseases of basal ganglia) to classify Neurodegeneration with Brain Iron Accumulation, while the corresponding ICD-9 code is 333.0.
Why are there no specific ICD codes for every subtype of NBIA?
Because Neurodegeneration with Brain Iron Accumulation encompasses at least ten distinct genetic subtypes, such as PKAN (Pantothenate Kinase-Associated Neurodegeneration) and PLAN (PLA2G6-Associated Neurodegeneration), coding is often based on the specific gene mutation identified. Because these conditions are rare and evolving in their clinical classification, medical coders often use "other" or "specified" codes to track the disease manifestations within the basal ganglia.
How is Neurodegeneration with Brain Iron Accumulation diagnosed?
Diagnosis of Neurodegeneration with Brain Iron Accumulation is typically confirmed through a combination of clinical symptoms, brain MRI showing "eye-of-the-tiger" signs or general iron overload, and genetic testing. At DiseaseMaps.org, 9 community members have shared their diagnostic journeys, highlighting that early genetic testing is the gold standard for distinguishing between the different forms of Neurodegeneration with Brain Iron Accumulation.
What are the common clinical features of NBIA?
While symptoms vary by genetic subtype, patients often present with a complex mix of neurological issues:
- Dystonia (involuntary muscle contractions)
- Parkinsonism (rigidity, bradykinesia)
- Optic atrophy or retinal degeneration
- Cognitive decline or neuropsychiatric symptoms
- Spasticity and gait disturbances
Next steps
- Consult a movement disorder specialist or a neurologist familiar with rare neurogenetic conditions.
- Request comprehensive genetic panel testing if a diagnosis of Neurodegeneration with Brain Iron Accumulation is suspected.
- Join the DiseaseMaps.org community to connect with the 9 other members currently navigating this diagnosis.
- Visit the NBIA Disorders Association website to find specialized clinical trials and research updates.
Medical disclaimer: This content is for informational purposes only and does not constitute medical advice, diagnosis, or treatment; always seek the advice of your physician or other qualified health provider with any questions regarding a medical condition.
References
- NIH Genetic and Rare Diseases Information Center (GARD): NBIA Disorders.
- Orphanet: Classification of neurodegeneration with brain iron accumulation.
- OMIM (Online Mendelian Inheritance in Man): Database for specific gene-related NBIA entries.
- NBIA Disorders Association: Patient resources and clinical research.
