Vocal cord paralysis (VCP) is the complete or partial loss of voluntary movement of one or both vocal cords (vocal folds) resulting from disruption of neural input along the vagus nerve (CN X) or its branch, the recurrent laryngeal nerve (RLN). The two vocal cords function as the primary gates of the airway — they open (abduct) during breathing, close (adduct) during swallowing to protect the airway, and vibrate during phonation to produce voice. When one or both cords become paralyzed, all three of these critical functions are affected to varying degrees. Unilateral vocal cord paralysis (UVCP) — the more common form — classically presents with breathy, weak, or hoarse dysphonia, dysphagia with liquids, and aspiration risk, as the opposite mobile cord cannot fully compensate for the loss of midline closure. Bilateral vocal cord paralysis (BVCP) is less common but carries greater severity — the cords tend to rest in a paramedian position, causing significant inspiratory stridor and respiratory distress, sometimes requiring emergency tracheotomy. The left RLN is paralyzed more frequently than the right because of its longer anatomical course through the mediastinum, looping under the aortic arch, making it vulnerable to thoracic malignancy, aortic aneurysm, mediastinal masses, and cardiac surgery. Common causes include thyroid and parathyroid surgery (most common iatrogenic cause), thyroid carcinoma, lung/esophageal/mediastinal malignancy, intubation injury, viral neuritis, stroke, and idiopathic etiology. In the inpatient setting, VCP coded at the correct specificity (J38.01 unilateral or J38.02 bilateral) carries important DRG weight, and bilateral VCP may serve as a CC that impacts MS-DRG grouping when concurrent with respiratory or surgical complications.
”Of the voice,” “pertaining to the voice” — from PIE root *wekʷ- meaning “to speak”; also underlying vocation, invoke, vocalize
cord
Latin chorda, from Greek χορδή (khordē)
“String, gut, chord” — originally referring to intestinal string; applied anatomically to string-like structures including vocal folds; also underlying notochord, chord
“Beside, beyond, contrary to” — in medical terminology, often indicates abnormal or disordered function, as in paralysis (loss of function beside/beyond normal)
Greek λύσις (lysis), from lyein (“to loosen, dissolve, release”)
“Loosening, dissolution, breaking down” — in medical compounds, denotes loss of function or disintegration; also underlying electrolysis, hemolysis, analysis
Literally: “loosening/loss of the voice strings” — capturing both the anatomical structure (cord/string) and the functional failure (paralysis/lysis). The term paralysis entered English via Latin from Greek παράλυσις (paralysis), meaning “loosening on one side.” The anatomical term vocal cord dates to the early 19th century; vocal fold is now the anatomically preferred term as the structures are layered folds of mucosa, not simple strings, though vocal cord remains the dominant clinical and coding term. The recurrent laryngeal nerve’s name itself reflects anatomy: from Latin re- (back) + currere (to run), as it “runs back” toward the larynx from its inferior loop off the vagus nerve.
🔀 ALIASES / ALTERNATE TERMS
Term
Context
Vocal fold paralysis
Anatomically preferred term; used interchangeably with vocal cord paralysis in clinical literature
Partial/incomplete paralysis; reduced motion but not complete loss; same code family (J38.0x)
Vocal fold paresis
Alternate anatomically preferred term for incomplete paralysis
Laryngeal paralysis
Broader term; used when arytenoid or extrinsic laryngeal muscles are also involved
Vagal paralysis
High vagal nerve lesion (above RLN branching) causing VCP; associated with additional CN X deficits
Glottic insufficiency
Clinical description; inability of the paralyzed cord to reach midline for complete closure
Medialization
Generic term for any procedure moving the paralyzed cord toward the midline; includes injection and thyroplasty
Type I thyroplasty
Isshiki classification for medialization thyroplasty; most common surgical treatment of UVCP
Phonosurgery
Umbrella term for all surgical procedures aimed at restoring or improving voice
🔗 RELATED TERMS
Recurrent laryngeal nerve (RLN) — branch of CN X; controls all intrinsic laryngeal muscles except the cricothyroid; primary nerve whose injury causes VCP
Vagus nerve (CN X) — parent nerve of the RLN; high vagal lesions cause VCP plus additional deficits (dysphagia, pharyngeal weakness)
Superior laryngeal nerve (SLN) — controls the cricothyroid muscle (pitch); SLN paralysis causes pitch changes and subtle hoarseness, distinct from RLN paralysis
Dysphonia — impaired voice quality; the primary presenting symptom of unilateral VCP; coded separately when documented as a distinct symptom
Dysphagia — difficulty swallowing; common in VCP due to impaired airway protection; coded R13.10 or more specific R13.1x when separately documented
Aspiration — entry of oral/pharyngeal contents into the airway; major complication of VCP, especially unilateral; coded J69.0 when aspiration pneumonia results
Stridor — inspiratory noise from turbulent airflow through a narrowed glottis; hallmark of bilateral VCP
Tracheotomy — emergency airway procedure for bilateral VCP with respiratory compromise; CPT 31600/31601
Medialization thyroplasty — Type I thyroplasty; surgical implant placed through thyroid cartilage window to push paralyzed cord to midline; CPT 31591
Arytenoid adduction — adjunct to medialization thyroplasty; repositions the arytenoid cartilage posteriorly; improves posterior glottal gap closure
Injection laryngoplasty — injectable augmentation (fat, collagen, hyaluronic acid, calcium hydroxylapatite) to bulk up and medialize the paralyzed cord; CPT 31570/31571/31513
Chemodenervation of larynx — botulinum toxin injection into the larynx; used for spasmodic dysphonia and sometimes paradoxical vocal cord motion, not standard VCP treatment; CPT 64617
Evaluation for use and/or fitting of voice prosthetic device to supplement oral speech (when communication device needed post-tracheotomy/laryngectomy)
Laryngoscopy, direct, operative, with injection into vocal cord(s), therapeutic; with operating microscope or telescope (OR-based with optical magnification)
Chemodenervation of muscle(s); larynx, unilateral, percutaneous, including guidance (e.g., for spasmodic dysphonia) (NOTE: used for spasmodic dysphonia, not standard VCP treatment; included for differential coding awareness)
⚠️ Coding Note: The most important ICD-10-CM distinction in VCP coding is J38.01 (unilateral) vs. J38.02 (bilateral) — never default to J38.00 (unspecified) when the operative report, laryngoscopy note, or physician documentation specifies laterality, as unspecified codes underrepresent clinical severity and may reduce DRG weight capture. Bilateral VCP (J38.02) is a higher-acuity code and a stronger CC candidate than unilateral; when present with a respiratory or surgical complication, always verify that it is coded to maximize accurate MS-DRG assignment. For iatrogenic/postprocedural VCP (most commonly post-thyroidectomy), query documentation for whether the paralysis was a known complication versus an expected outcome — J95.89 (postprocedural respiratory complication) may apply, and this code has CC-level impact in the inpatient setting. Dysphagia (R13.1x) and aspiration pneumonia (J69.0) are separately codeable from VCP when independently documented — do not assume they are integral; these additional codes can significantly impact DRG grouping and complexity. For CPT injection codes, 31574 (flexible scope, office-based, therapeutic injection) has largely replaced 31513 (indirect) at many centers — verify which approach was used before selecting the injection code. CPT 31591 (medialization thyroplasty) is currently the only AMA CPT code for Type I thyroplasty; arytenoid adduction does not have its own standalone CPT code and is reported using 31591 with modifier -22 to capture the additional surgical work, supporting documentation in the operative note is required.
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