Specific code 2014 ICD-9-CM Diagnosis Code 358.1
Myasthenic syndromes in diseases classified elsewhere
  • Billable Code
  • Manifestation Code
  • Short description: Myasthenia in oth dis.
  • ICD-9-CM 358.1 will be replaced by an equivalent ICD-10-CM code (or codes) when the United States transitions from ICD-9-CM to ICD-10-CM on October 1, 2015.
  • ICD-9-CM 358.1 is a billable medical code that can be used to specify a diagnosis on a reimbursement claim.
Disease Synonyms
  • Eaton Lambert syndrome
  • Eaton-Lambert syndrome (disorder)
  • Myasthenic syndrome due to another disorder
Code First
ICD-9-CM Coding Information
  • 358.1 describes the manifestation of an underlying disease, not the disease itself, and therefore should not be used as a principal diagnosis.
Convert to ICD-10-CM: 358.1 converts directly to:
  • 2014 ICD-10-CM G73.3 Myasthenic syndromes in other diseases classified elsewhere
ICD-9-CM Volume 2 Index entries containing back-references to 358.1:
  • Myasthenia 358.00
    • syndrome
      • in
        • botulism 005.1 [358.1]
        • diabetes mellitus 250.6 [358.1]
          • due to secondary diabetes 249.6 [358.1]
        • hypothyroidism (see also Hypothyroidism) 244.9 [358.1]
        • malignant neoplasm NEC 199.1 [358.1]
        • pernicious anemia 281.0 [358.1]
        • thyrotoxicosis (see also Thyrotoxicosis) 242.9 [358.1]
ICD-9-CM codes are used in medical billing and coding to describe diseases, injuries, symptoms and conditions. ICD-9-CM 358.1 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 2014 ICD-9-CM Index or use the search engine at the top of this page to lookup any code.