Short answer · Medically reviewed summary · Last updated: 2026-05-08
Kennedy disease, also known as Spinal and Bulbar Muscular Atrophy (SBMA), is classified under ICD-10 code G12.21 for motor neuron disease and historically under ICD-9 code 335.21. These codes are essential for medical billing, clinical documentation, and identifying patients within healthcare registries. What is the clinical nature of Kennedy disease? Kennedy disease is a rare, X-linked recessive neuromuscular disorder characterized by the degeneration of lower motor neurons.
ICD10 code of Kennedy Disease and ICD9 code
ICD-10 and ICD-9 codes for Kennedy Disease, with classification details for clinicians, coders and patients.
Kennedy disease, also known as Spinal and Bulbar Muscular Atrophy (SBMA), is classified under ICD-10 code G12.21 for motor neuron disease and historically under ICD-9 code 335.21. These codes are essential for medical billing, clinical documentation, and identifying patients within healthcare registries.
What is the clinical nature of Kennedy disease?
Kennedy disease is a rare, X-linked recessive neuromuscular disorder characterized by the degeneration of lower motor neurons. It primarily affects biological males, typically manifesting between the ages of 30 and 50. Because Kennedy disease involves the androgen receptor gene, it leads to both progressive muscle weakness and signs of androgen insensitivity, such as gynecomastia or reduced fertility.
How is Kennedy disease genetically inherited?
Kennedy disease is caused by a CAG trinucleotide repeat expansion in the androgen receptor (AR) gene located on the X chromosome. Because it is X-linked, mothers who carry the mutation have a 50% chance of passing it to their sons. Understanding the genetic basis of Kennedy disease is vital for family planning and genetic counseling, as it differentiates the condition from other motor neuron diseases like ALS.
What diagnostic markers are associated with Kennedy disease?
Clinicians utilize specific diagnostic criteria to confirm Kennedy disease, often distinguishing it from other mimics through the following clinical findings:
- Genetic Testing: Detection of more than 38 CAG repeats in the AR gene.
- Muscle Involvement: Presence of fasciculations (muscle twitching) and atrophy, particularly in the bulbar, facial, and limb muscles.
- Endocrine Features: Reports of gynecomastia, erectile dysfunction, or testicular atrophy.
- Electromyography (EMG): Demonstrating widespread chronic denervation.
How does the community support those with Kennedy disease?
Living with Kennedy disease can feel isolating due to its rarity. Currently, 9 individuals within the DiseaseMaps.org community have shared their experiences, offering a unique platform to connect with others who understand the nuances of managing this condition. Engaging with peers can provide invaluable emotional support and practical coping strategies for the daily challenges of Kennedy disease.
Next steps
- Consult a neurologist specializing in neuromuscular disorders for definitive genetic testing.
- Speak with a genetic counselor to discuss family screening and inheritance patterns.
- Join the DiseaseMaps.org community to connect with other patients and caregivers.
- Monitor ongoing clinical trials and research updates via the NIH GARD portal.
Medical disclaimer: This information is for educational purposes only and does not replace professional medical advice, diagnosis, or treatment.
References
- NIH GARD: Spinal and Bulbar Muscular Atrophy (Kennedy Disease)
- Orphanet: Spinal and bulbar muscular atrophy (ORPHA:582)
- OMIM: Spinal and Bulbar Muscular Atrophy; SBMA (#313200)
- Kennedy's Disease Association: Official patient support and research resources
