October 9, 2025
The E03.9 diagnosis code in the ICD-10-CM system represents Hypothyroidism, unspecified. It is used when a patient has an underactive thyroid gland, but the medical records lack sufficient detail to specify the exact type or cause of hypothyroidism.
Hypothyroidism affects the bodyβs metabolism and can lead to fatigue, weight gain, cold intolerance, and cognitive issues. Because this code is unspecified, it should generally be used when more precise documentation is not available.
Hypothyroidism is a disorder in which the thyroid gland is underactive, leading to reduced production of thyroid hormones. These hormones play an important role in regulating metabolism, energy production, and overall body functions.Β
Common symptoms include weakness, weight gain, depression, cold intolerance, and hair thinning.
Different forms of hypothyroidism have specific ICD-10 codes. Below is a detailed overview:
Subclinical Hypothyroidism
Acquired Hypothyroidism
Hypothyroidism Due to Thyroidectomy
Hashimotoβs Thyroiditis
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|
ICD-10 Code |
Description |
When Itβs Used |
|
E03.9 |
Hypothyroidism, unspecified |
When hypothyroidism is confirmed, but the cause/type is not documented. |
|
E03.8 |
Other specified hypothyroidism |
When a specific type of hypothyroidism (other than common categories) is documented. |
|
E06.3 |
Autoimmune thyroiditis (Hashimotoβs) |
When hypothyroidism is due to Hashimotoβs thyroiditis. |
|
E02 |
Subclinical iodine-deficiency hypothyroidism |
When thyroid hormone levels are borderline due to iodine deficiency. |
|
E89.0 |
Postprocedural hypothyroidism |
When hypothyroidism occurs after surgery or treatment. |
The E03.9 diagnosis code is essential in cases where hypothyroidism is confirmed but the details remain unclear. While it is billable, coders should always check for opportunities to use more specific ICD-10 codes whenever possible.
Our expert coding team ensures your thyroid-related claims, including E03.9 and related endocrine codes, are submitted accurately to reduce denials and speed up payments.
Contact CuresMB today for expert medical coding and billing support that keeps your revenue cycle healthy.
E03.9 is used for Hypothyroidism, unspecified. Itβs chosen when the provider confirms hypothyroidism but does not specify the cause or type in the medical record
E03.9 means Hypothyroidism, unspecified, an underactive thyroid where the cause is not clearly defined.
Yes, E03.9 is a billable ICD-10-CM code and can be reported as a primary diagnosis for reimbursement.
The correct code is E06.3 β Autoimmune thyroiditis, which is more specific than E03.9.
E03.9 is used when hypothyroidism is unspecified, while E03.8 is for βOther specified hypothyroidism,β where details are known but donβt fit other defined categories.
Yes. E03.9 applies in both settings when documentation does not specify the type of hypothyroidism.
In Spanish, E03.9 is documented as Hipotiroidismo, no especificado.
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