ICD-9 Code 242.90

Thyrotoxicosis without mention of goiter or other cause, and without mention of thyrotoxic crisis or storm

Not Valid for Submission

242.90 is a legacy non-billable code used to specify a medical diagnosis of thyrotoxicosis without mention of goiter or other cause, and without mention of thyrotoxic crisis or storm. This code was replaced on September 30, 2015 by its ICD-10 equivalent.

ICD-9: 242.90
Short Description:Thyrotox NOS no crisis
Long Description:Thyrotoxicosis without mention of goiter or other cause, and without mention of thyrotoxic crisis or storm

Convert 242.90 to ICD-10

The following crosswalk between ICD-9 to ICD-10 is based based on the General Equivalence Mappings (GEMS) information:

  • E05.90 - Thyrotoxicosis, unsp without thyrotoxic crisis or storm

Code Classification

  • Endocrine, nutritional and metabolic diseases, and immunity disorders (240–279)
    • Disorders of thyroid gland (240-246)
      • 242 Thyrotoxicosis with or without goiter

Information for Medical Professionals


  • Apathetic thyrotoxicosis
  • Autonomous thyroid function
  • Borderline thyrotoxicosis
  • Chronic thyroiditis with transient thyrotoxicosis
  • Circumscribed nodular and tuberous pretibial myxedema
  • Diffuse pretibial myxedema
  • Dysprealbuminemic euthyroidal hyperthyroxinemia
  • Hypercalcemia due to hyperthyroidism
  • Hypermelanosis due to hyperthyroidism
  • Hypermelanosis of the eyelids due to hyperthyroidism
  • Hyperthyroidism
  • Hyperthyroidism in childbirth
  • Hyperthyroidism secondary to radio contrast dyes
  • Hypertrichosis in hyperthyroidism
  • Hypertrophic cardiomyopathy secondary to hyperthyroidism
  • Myasthenic syndrome due to thyrotoxicosis
  • Pretibial myxedema
  • Subclinical hyperthyroidism
  • T>3< thyrotoxicosis
  • Thyroid acropachy
  • Thyrotoxic chorea
  • Thyrotoxic facies
  • Thyrotoxic heart disease
  • Thyrotoxic myopathy
  • Thyrotoxicosis
  • Thyrotoxicosis with or without goiter
  • Thyrotoxicosis without goiter OR other cause

Information for Patients


Your thyroid is a butterfly-shaped gland in your neck, just above your collarbone. It is one of your endocrine glands, which make hormones. Thyroid hormones control the rate of many activities in your body. These include how fast you burn calories and how fast your heart beats. All of these activities are your body's metabolism. If your thyroid is too active, it makes more thyroid hormones than your body needs. This is called hyperthyroidism.

Hyperthyroidism is more common in women, people with other thyroid problems, and those over 60 years old. Grave's disease, an autoimmune disorder, is the most common cause. Other causes include thyroid nodules, thyroiditis, consuming too much iodine, and taking too much synthetic thyroid hormone.

The symptoms can vary from person to person. They may include

  • Being nervous or irritable
  • Mood swings
  • Fatigue or muscle weakness
  • Heat intolerance
  • Trouble sleeping
  • Hand tremors
  • Rapid and irregular heartbeat
  • Frequent bowel movements or diarrhea
  • Weight loss
  • Goiter, which is an enlarged thyroid that may cause the neck to look swollen

To diagnose hyperthyroidism, your doctor will look at your symptoms, blood tests, and sometimes a thyroid scan. Treatment is with medicines, radioiodine therapy, or thyroid surgery. No single treatment works for everyone.

NIH: National Institute of Diabetes and Digestive and Kidney Diseases

  • Eyes - bulging
  • Factitious hyperthyroidism
  • Graves disease
  • Hyperthyroidism
  • Radioactive iodine uptake
  • Silent thyroiditis
  • Subacute thyroiditis
  • T3
  • T4 test
  • Thyroid Tests - NIH (National Institute of Diabetes and Digestive and Kidney Diseases)
  • Thyrotoxic periodic paralysis
  • TSH test
  • TSI

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ICD-9 Footnotes

General Equivalence Map Definitions
The ICD-9 and ICD-10 GEMs are used to facilitate linking between the diagnosis codes in ICD-9-CM and the new ICD-10-CM code set. The GEMs are the raw material from which providers, health information vendors and payers can derive specific applied mappings to meet their needs.

  • Approximate Flag - The approximate flag is on, indicating that the relationship between the code in the source system and the code in the target system is an approximate equivalent.
  • No Map Flag - The no map flag indicates that a code in the source system is not linked to any code in the target system.
  • Combination Flag - The combination flag indicates that more than one code in the target system is required to satisfy the full equivalent meaning of a code in the source system.