AHA Coding Clinic® for ICD-9 - 2007 Issue 4; VOLUMES 1 AND 2 NEW/REVISED CODES

Myotonic Disorders

Effective October 1, 2007, code 359.2, Myotonic disorders, has been expanded to create unique codes for the different types of disorders currently grouped together under code 359.2. These codes were created to help distinguish the severity between myotonic dystrophy, which is chronic, progressive, and often severe, compared with the milder course of myotonia congenita. Myotonia involves very slow relaxation of muscle after it contracts. This may be seen from any type of contraction, whether voluntary, or due to stretch reflex or electrical stimulation. Myotonic muscular dystrophy (Steinart disease) is the second most common muscular dystrophy in North...

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