Specific code 2015 ICD-9-CM Diagnosis Code 333.91
Stiff-man syndrome
  • 2015
  • Billable Thru Sept 30/2015
  • Non-Billable On/After Oct 1/2015

  • ICD-9-CM 333.91 is a billable medical code that can be used to indicate a diagnosis on a reimbursement claim, however, 333.91 should only be used for claims with a date of service on or before September 30, 2015. For claims with a date of service on or after October 1, 2015, use an equivalent ICD-10-CM code (or codes).
Convert to ICD-10-CM: 333.91 converts directly to:
  • 2015/16 ICD-10-CM G25.82 Stiff-man syndrome
Approximate Synonyms
  • Stiff man syndrome
Clinical Information
  • A condition characterized by persistent spasms (spasm) involving multiple muscles, primarily in the lower limbs and trunk. The illness tends to occur in the fourth to sixth decade of life, presenting with intermittent spasms that become continuous. Minor sensory stimuli, such as noise and light touch, precipitate severe spasms. Spasms do not occur during sleep and only rarely involve cranial muscles. Respiration may become impaired in advanced cases. (Adams et al., Principles of Neurology, 6th ed, p1492; neurology 1998 jul;51(1):85-93)
  • A rare neurologic disorder characterized by muscle rigidity. It usually affects the axial muscles and eventually extends to the proximal limb muscles. It is associated with muscle spasms which may lead to muscle damage and fractures
ICD-9-CM Volume 2 Index entries containing back-references to 333.91:
  • Stiff-man syndrome 333.91
  • Syndrome - see also Disease
    • stiff-man 333.91
ICD-9-CM codes are used in medical billing and coding to describe diseases, injuries, symptoms and conditions. ICD-9-CM 333.91 is one of thousands of ICD-9-CM codes used in healthcare. Although ICD-9-CM and CPT codes are largely numeric, they differ in that CPT codes describe medical procedures and services. Can't find a code? Start at the root of ICD-9-CM, check the 2015 ICD-9-CM Index or use the search engine at the top of this page to lookup any code.