ICD-9 Code 255.10

Hyperaldosteronism, unspecified

Not Valid for Submission

255.10 is a legacy non-billable code used to specify a medical diagnosis of hyperaldosteronism, unspecified. This code was replaced on September 30, 2015 by its ICD-10 equivalent.

ICD-9: 255.10
Short Description:Hyperaldosteronism NOS
Long Description:Hyperaldosteronism, unspecified

Convert 255.10 to ICD-10

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

  • E26.09 - Other primary hyperaldosteronism
  • E26.9 - Hyperaldosteronism, unspecified

Code Classification

  • Endocrine, nutritional and metabolic diseases, and immunity disorders (240–279)
    • Diseases of other endocrine glands (249-259)
      • 255 Disorders of adrenal glands

Information for Medical Professionals

Index to Diseases and Injuries

References found for the code 255.10 in the Index of Diseases and Injuries:

    • Aldosteronism primary 255.10
      • congenital 255.10
      • familial type I 255.11
      • glucocorticoid remediable 255.11
      • secondary 255.14
    • Hyperaldosteronism atypical hyperplastic normoaldosteronal normotensive primary 255.10
      • secondary 255.14
    • Hyporeninemia extreme 790.99
      • in primary aldosteronism 255.10

Information for Patients


Adrenal Gland Disorders

What are adrenal glands?

Your adrenal glands are two small organs that sit on top of each kidney. The adrenal glands make different types of hormones you need to stay alive and healthy. Hormones are chemicals that travel in your bloodstream and control how different parts of your body work.

The adrenal glands make the hormones cortisol, aldosterone, adrenaline, and noradrenaline. They also make hormones that your body uses to make sex hormones (estrogen and testosterone). All of these hormones do many important jobs, including:

  • Turning food into energy and managing blood sugar levels
  • Balancing salt and water
  • Keeping blood pressure normal
  • Responding to illness and stress (your "fight or flight" response)
  • Timing when and how fast a child develops sexually
  • Supporting pregnancy

What are adrenal gland disorders?

When you have an adrenal gland disorder, your body makes too much or too little of one or more hormones. The symptoms depend on the type of problem you have and how much it affects the hormone levels in your body.

There are many types of adrenal gland disorders, including:

  • Addison's Disease - a condition in which the adrenal glands don't make enough cortisol
  • Cushing's Syndrome - a condition caused by too much cortisol in the body, often from taking steroid medicines for a long time
  • Aldosterone-producing adenoma - a benign tumor (not cancer) that makes too much aldosterone and may cause serious high blood pressure
  • Hereditary paraganglioma-pheochromocytoma - an inherited condition causing different types of tumors that make adrenaline and other hormones. Some tumors may become cancerous.
  • Adrenal gland cancer - cancerous tumors, including adrenocortical carcinoma and neuroblastoma
  • Congenital Adrenal Hyperplasia (CAH) - a group of inherited disorders in which the adrenal glands don't make enough cortisol. The most common type is 21-hydroxylase deficiency (also called CAH1). In the United States, newborn babies get a blood test to see if they have CAH. People born with CAH may not have symptoms until childhood or later in life.

What causes adrenal gland disorders?

The cause of adrenal gland disorders depends on the type of disorder you have. Causes can include:

  • Medicines such as steroids
  • A problem in another gland, such as the pituitary gland. The pituitary gland releases hormones that affect how the adrenal glands work.
  • Changes in genes (mutations). These changes can cause the adrenal glands to make too much or too little of one or more hormones.
  • Infections

In many cases the cause of the problem isn't clear.

How are adrenal gland disorders diagnosed?

Health care providers use different tests to check for adrenal disorders depending on your symptoms and health history. For example, you may have tests of your blood, urine (pee), or saliva (spit). These tests check your hormone levels. Your provider may order x-rays, CT scans, or MRI scans to look for tumors.

What are the treatments for adrenal gland disorders?

Different types of adrenal gland disorders have different treatments. They include medicines and surgery. Radiation therapy is sometimes a treatment for tumors. There are treatments to cure certain adrenal gland disorders. For other disorders, treatments can manage your symptoms.

NIH: National Institute of Child Health and Human Development


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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.

Index of Diseases and Injuries Definitions

  • And - The word "and" should be interpreted to mean either "and" or "or" when it appears in a title.
  • Code also note - A "code also" note instructs that two codes may be required to fully describe a condition, but this note does not provide sequencing direction.
  • Code first - Certain conditions have both an underlying etiology and multiple body system manifestations due to the underlying etiology. For such conditions, the ICD-10-CM has a coding convention that requires the underlying condition be sequenced first followed by the manifestation. Wherever such a combination exists, there is a "use additional code" note at the etiology code, and a "code first" note at the manifestation code. These instructional notes indicate the proper sequencing order of the codes, etiology followed by manifestation.
  • Type 1 Excludes Notes - A type 1 Excludes note is a pure excludes note. It means "NOT CODED HERE!" An Excludes1 note indicates that the code excluded should never be used at the same time as the code above the Excludes1 note. An Excludes1 is used when two conditions cannot occur together, such as a congenital form versus an acquired form of the same condition.
  • Type 2 Excludes Notes - A type 2 Excludes note represents "Not included here". An excludes2 note indicates that the condition excluded is not part of the condition represented by the code, but a patient may have both conditions at the same time. When an Excludes2 note appears under a code, it is acceptable to use both the code and the excluded code together, when appropriate.
  • Includes Notes - This note appears immediately under a three character code title to further define, or give examples of, the content of the category.
  • Inclusion terms - List of terms is included under some codes. These terms are the conditions for which that code is to be used. The terms may be synonyms of the code title, or, in the case of "other specified" codes, the terms are a list of the various conditions assigned to that code. The inclusion terms are not necessarily exhaustive. Additional terms found only in the Alphabetic Index may also be assigned to a code.
  • NEC "Not elsewhere classifiable" - This abbreviation in the Alphabetic Index represents "other specified". When a specific code is not available for a condition, the Alphabetic Index directs the coder to the "other specified” code in the Tabular List.
  • NOS "Not otherwise specified" - This abbreviation is the equivalent of unspecified.
  • See - The "see" instruction following a main term in the Alphabetic Index indicates that another term should be referenced. It is necessary to go to the main term referenced with the "see" note to locate the correct code.
  • See Also - A "see also" instruction following a main term in the Alphabetic Index instructs that there is another main term that may also be referenced that may provide additional Alphabetic Index entries that may be useful. It is not necessary to follow the "see also" note when the original main term provides the necessary code.
  • 7th Characters - Certain ICD-10-CM categories have applicable 7th characters. The applicable 7th character is required for all codes within the category, or as the notes in the Tabular List instruct. The 7th character must always be the 7th character in the data field. If a code that requires a 7th character is not 6 characters, a placeholder X must be used to fill in the empty characters.
  • With - The word "with" should be interpreted to mean "associated with" or "due to" when it appears in a code title, the Alphabetic Index, or an instructional note in the Tabular List. The word "with" in the Alphabetic Index is sequenced immediately following the main term, not in alphabetical order.