ICD-10 DIAGNOSIS CODE
M10.9 is the code your team reaches for when a provider documents gout but the record doesn’t specify which joint, the underlying cause, or laterality. Use it as a placeholder only until the chart supports a more specific code.
Billable: Yes
Code Specificity: Low
Code Set:ICD-10-CM 2026
E03.9 represents hypothyroidism, unspecified. It is used when a healthcare provider diagnoses an underactive thyroid but does not specify whether it is caused by autoimmune disease, medication, congenital factors, surgery or another condition. The ICD-10 code for hypothyroidism is selected based on the cause documented in the medical record.
Endocrine, nutritional and metabolic diseases
Disorders of thyroid gland
Other hypothyroidism
Hypothyroidism, unspecified
The ICD-10 hypothyroidism code E03.9 is used when:
Common terms associated with ICD-10 code hypothyroidism include:
The following laboratory CPT codes may commonly be billed with an E03.9 diagnosis when medically necessary:
E03.9 should not be reported when documentation supports a more specific diagnosis, including:
These conditions require their own specific ICD-10-CM codes.
Hypothyroidism occurs when the thyroid gland does not produce enough thyroid hormones, mainly thyroxine (T4) and triiodothyronine (T3). These hormones regulate metabolism, energy production, body temperature and many other essential functions.
The hypothyroidism ICD-10 code E03.9 is commonly used in primary care and endocrinology when the diagnosis is confirmed but the underlying cause has not been identified.
Subclinical hypothyroidism occurs when thyroid stimulating hormone (TSH) levels are elevated while thyroid hormone levels, especially free T4, remain within normal ranges.
There is no separate ICD-10-CM code specifically dedicated only to subclinical hypothyroidism. In many cases, providers use E03.9 when the condition is documented as unspecified hypothyroidism.
E03.9 means hypothyroidism, unspecified. It indicates that a patient has an underactive thyroid condition, but the medical record does not specify the cause.
E03.9 is used for unspecified hypothyroidism, while E03.0 is specifically for congenital hypothyroidism, which is present at birth.
Yes. E03.9 is a billable ICD-10-CM code and can be submitted on healthcare claims when documentation supports unspecified hypothyroidism.
The commonly used ICD-10 code for hypothyroidism is E03.9 when the condition is unspecified. More specific codes should be used when the cause is documented.
Common thyroid-related CPT codes include 84443 for TSH testing, 84439 for Free T4 testing, 84436 for Total T4 testing and 84480 for T3 testing.
A more specific code should be selected when documentation identifies the cause, such as medication-induced hypothyroidism, Congenital hypothyroidism, Postprocedural hypothyroidism and other specified thyroid disorders.
Accurate coding helps healthcare organizations improve claim accuracy, reduce denials, support medical necessity and maintain proper clinical documentation.
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