dysarthria

DEFINITION of dysarthria

Dysarthria is a neurogenic motor speech disorder resulting from damage to the central or peripheral nervous system that disrupts the muscular control of speech production. It affects one or more of the components of speech: respiration, phonation, resonance, articulation, and prosody. Unlike aphasia (which is a language disorder), dysarthria does not impair language processing or comprehension — the patient knows what they want to say but cannot physically produce the sounds clearly. It can range from mild slurring to complete unintelligibility (anarthria). Common causes include stroke, traumatic brain injury, cerebral Palsy, Parkinson’s disease, ALS, MS, and cerebellar disorders. There are multiple subtypes (spastic, flaccid, ataxic, hypokinetic, hyperkinetic, mixed) based on the neurological lesion involved.

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ETYMOLOGY of dysarthria

greek

Component	Origin	Meaning
dys-	Greek dys- (δυσ-)	Bad, difficult, abnormal, or impaired
-arthria	Greek arthroun (ἀρθροῦν), from arthron (ἄρθρον)	To articulate, to joint; specifically “to utter distinctly”

Literally: “difficulty articulating” — referring to impaired ability to form and produce speech sounds clearly.

Note: arthron in this context refers to the jointing or articulation of speech sounds, not skeletal joints — though both meanings share the same root.

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🔀 ALIASES / ALTERNATE TERMS

• Anarthria — severe/complete loss of articulate speech (the extreme end of dysarthria)
• Motor speech disorder
• Slurred speech (lay term)
• Dysarthrophonia (when both articulation and voice/phonation are affected)
• Spastic dysarthria — due to upper motor neuron damage (e.g., bilateral stroke)
• Flaccid dysarthria — due to lower motor neuron/cranial nerve damage
• Ataxic dysarthria — due to cerebellar lesions (irregular, scanning speech)
• Hypokinetic dysarthria — classic of Parkinson’s disease (soft, monotone)
• Hyperkinetic dysarthria — due to basal ganglia disorders
• Mixed dysarthria — e.g., ALS (combined flaccid + spastic)

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🔗 RELATED TERMS

• Aphasia — language disorder (comprehension/expression), not motor; often co-occurs with dysarthria post-stroke
• Apraxia of speech — motor planning disorder; distinct from dysarthria
• Dysphagia — difficulty swallowing; shares the same motor neuron pathways, frequently co-occurring
• Anarthria — complete inability to articulate speech
• Dysphonia — impaired voice/phonation, often a component of dysarthria
• Bulbar palsy — LMN disorder affecting cranial nerves IX-XII; causes flaccid dysarthria
• Pseudobulbar palsy — UMN disorder causing spastic dysarthria
• Cerebral infarction / TIA — common acute cause
• Parkinson’s disease — common degenerative cause
• ALS (Amyotrophic Lateral Sclerosis) — causes progressive mixed dysarthria
• Multiple sclerosis — can cause ataxic or mixed dysarthria
• Speech-Language Pathology (SLP) — primary treatment discipline
• Augmentative and Alternative Communication (AAC) — used in severe cases

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CODING CORNER

🏥 ICD-10-CM CODES

Primary / Symptom Code

Code	Description
R47.1	Dysarthria and anarthria (use when not documented as sequela of a specific cerebrovascular event)

Dysarthria as Sequela of Cerebrovascular Disease (Category I69)

Code	Description
I69.022	Dysarthria following nontraumatic subarachnoid hemorrhage
I69.122	Dysarthria following nontraumatic intracerebral hemorrhage
I69.222	Dysarthria following other nontraumatic intracranial hemorrhage
I69.322	Dysarthria following cerebral infarction
I69.822	Dysarthria following other cerebrovascular disease
I69.922	Dysarthria following unspecified cerebrovascular disease

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🔧 COMMON CPT CODES (Dysarthria-Related Evaluation & Treatment)

CPT Code	Description
92521	Evaluation of speech fluency
92522	Evaluation of speech sound production (articulation, phonological processing, motor planning)
92523	Evaluation of speech sound production with evaluation of language comprehension and expression
92524	Behavioral and qualitative analysis of voice and resonance
92507	Treatment of speech, language, voice, communication, and/or auditory processing disorder (individual)
92508	Treatment of speech, language, voice, communication, and/or auditory processing disorder (group)
92597	Evaluation for use and/or fitting of voice prosthetic device
92609	Therapeutic services for use of speech-generating device
96105	Assessment of aphasia (with interpretation and report)
70553	MRI brain with and without contrast (imaging to identify causative lesion)
70498	CT angiography, neck (if carotid/vertebral etiology being worked up)

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⚠️ Coding Note: For inpatient coding, dysarthria is a CC (Complication/Comorbidity) under MS-DRG grouping when coded as R47.1. When dysarthria is documented as a sequela of stroke, use the appropriate I69.x22 code rather than R47.1 — the I69 sequela codes carry the stroke history context and are preferred for specificity. Always check the physician’s documentation carefully: dysarthria (motor) should not be coded as aphasia (language/R47.01) — they are distinct and not interchangeable, though they may coexist.

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DERIVATIONS of dysarthria

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Query functionality

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Med roots Appendix A Prefixes Appendix B Combining Forms Appendix C Suffixes Appendix D Suffix forms