2025 ICD-10-CM code G71.14
(Active) Effective Date: N/A Diseases of the nervous system - Myotonic disorders 6 Feed
Drug-induced myotonia. Use additional code for adverse effect, if applicable, to identify drug (T36-T50 with fifth or sixth character 5).
Medical necessity for diagnosing and managing drug-induced myotonia is established by the presence of characteristic symptoms and signs, such as impaired muscle relaxation, muscle weakness, and pain, associated with the use of specific medications. Further diagnostic testing, such as EMG and blood tests, may be necessary to confirm the diagnosis and assess the severity of the condition.
Providers diagnose drug-induced myotonia based on medical history, signs and symptoms, and physical and neurological examination. Diagnostic studies include blood testing for drug levels and renal function, muscle biopsy, EMG, and pulmonary function tests. Treatment involves discontinuing the causative medication.
In simple words: Drug-induced myotonia is a muscle problem caused by certain medications.It makes it hard for muscles to relax after they tighten up. Symptoms can range from mild muscle weakness to severe kidney problems.
Drug-induced myotonia refers to a muscular disorder caused by the chronic use of certain drugs. Symptoms range from impaired muscle relaxation and mild muscle weakness to acute renal failure. Temporary or short-lived myotonia can be caused by long-term use of statins, beta blockers or diuretics, muscle relaxants, zidovudine, cocaine, colchicine, or antimalarial, lipid-lowering, anesthetic, and other drugs.
Example 1: A patient taking a statin for high cholesterol develops muscle stiffness and difficulty relaxing muscles after contraction. After other causes are ruled out, the physician diagnoses drug-induced myotonia and switches the patient to a different cholesterol-lowering medication., A patient with a history of cocaine abuse presents with severe muscle pain, weakness, and dark urine. Blood tests reveal elevated creatinine kinase and myoglobin, indicating rhabdomyolysis, a complication of drug-induced myotonia., A patient on long-term colchicine therapy for gout experiences muscle cramps and impaired muscle relaxation. EMG confirms myotonia, and the physician adjusts the colchicine dosage to manage the side effect.
Documentation should include the patient's medication history, signs and symptoms, physical and neurological exam findings, results of diagnostic tests (such as EMG, blood tests for drug levels and renal function, muscle biopsy, and pulmonary function test), and the treatment plan, including discontinuation of the causative medication.
- Specialties:Neurology, Internal Medicine, Clinical Pharmacology, Pain Management
- Place of Service:Office, Inpatient Hospital, Outpatient Hospital