Other hypothyroidism (E03) ICD-10-CM
The E03 code range covers other hypothyroidism with 9 ICD-10-CM diagnosis codes. 8 of them are billable and valid for claim submission in fiscal year 2026, and the category headers group them but cannot themselves be billed.
Type 1 Excludes
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.
Codes in the E03 Range 9 codes · 8 billable
- E03 Other hypothyroidismNon-billable
- E03.0 Congenital hypothyroidism with diffuse goiter
- E03.1 Congenital hypothyroidism without goiter
- E03.2 Hypothyroidism due to medicaments and other exogenous substances
- E03.3 Postinfectious hypothyroidism
- E03.4 Atrophy of thyroid (acquired)
- E03.5 Myxedema coma
- E03.8 Other specified hypothyroidism
- E03.9 Hypothyroidism, unspecified
Clinical Terms in This Code Range
Definitions from the National Library of Medicine for conditions coded in the E03 range.
Choanal Atresia
A congenital abnormality that is characterized by a blocked CHOANAE, the opening between the nose and the NASOPHARYNX. Blockage can be unilateral or bilateral; bony or membranous.
Congenital Hypothyroidism
A condition in infancy or early childhood due to an in-utero deficiency of THYROID HORMONES that can be caused by genetic or environmental factors, such as thyroid dysgenesis or HYPOTHYROIDISM in infants of mothers treated with THIOURACIL during pregnancy. Endemic cretinism is the result of iodine deficiency. Clinical symptoms include severe MENTAL RETARDATION, impaired skeletal development, short stature, and MYXEDEMA.
Hypothyroidism
A syndrome that results from abnormally low secretion of THYROID HORMONES from the THYROID GLAND, leading to a decrease in BASAL METABOLIC RATE. In its most severe form, there is accumulation of MUCOPOLYSACCHARIDES in the SKIN and EDEMA, known as MYXEDEMA. It may be primary or secondary due to other pituitary disease, or hypothalamic dysfunction.
Myxedema
A condition characterized by a dry, waxy type of swelling (EDEMA) with abnormal deposits of MUCOPOLYSACCHARIDES in the SKIN and other tissues. It is caused by a deficiency of THYROID HORMONES. The skin becomes puffy around the eyes and on the cheeks. The face is dull and expressionless with thickened nose and lips.
Scleromyxedema
A connective tissue disorder characterized by widespread thickening of SKIN with a cobblestone-like appearance. It is caused by proliferation of FIBROBLASTS and deposition of MUCIN in the DERMIS in the absence of thyroid disease. Most scleromyxedema cases are associated with a MONOCLONAL GAMMOPATHY, immunoglobulin IgG-lambda.
About the E03 Code Range
The ICD-10 code section E03 covers "Other hypothyroidism," a group of thyroid disorders characterized by insufficient thyroid hormone production not classified elsewhere. These codes are used to specify various forms of hypothyroidism beyond primary causes, including congenital, drug-induced, and acquired conditions.
This section includes detailed codes like E03.0 for congenital hypothyroidism with diffuse goiter and E03.1 for congenital hypothyroidism without goiter, encompassing numerous genetic and developmental thyroid abnormalities. For example, congenital hypothyroidism may be referred to by synonyms such as "congenital iodine deficiency syndrome" or "thyroid atrophy," guiding coders to the appropriate diagnosis. Drug-induced hypothyroidism is captured under E03.2, addressing conditions caused by medications like amiodarone. Other specific types, including postinfectious hypothyroidism (E03.3), acquired thyroid atrophy (E03.4), and severe states like myxedema coma (E03.5), are also included. The code E03.8 covers other specified hypothyroidism types, such as postpartum hypothyroidism and autoimmune thyroid diseases. Finally, E03.9 is used for unspecified hypothyroidism when the exact cause is unclear. Understanding these codes helps ensure precise documentation and better communication about thyroid function disorders in medical records, billing, and treatment planning.
Questions About This Page
How many billable codes are in the E03 range?
Of the 9 codes in this range, 8 are billable and valid for claim submission from October 1, 2025 through September 30, 2026. Category header codes group them but cannot be reported on claims.
What does the E03 range classify?
The range classifies other hypothyroidism. Each code links to its own reference page with billing status, MS-DRG grouping, coding notes, and clinical information.
Related References
Source: CMS FY 2026 ICD-10-CM Tabular List and order file, effective October 1, 2025 through September 30, 2026.
