What is the ICD-10 code for low T4?

The ICD-10 code for low T4, when unspecified, is E03.9. For specific causes like postprocedural or drug-induced hypothyroidism, use E89.0 or E03.2 respectively.

How do you document low T4 in medical records?

Document low T4 by including lab results showing TSH and free T4 levels, along with any symptoms and treatment plans.

ICD-10 Coding for Low T4(E03.9, E03.0, E03.1)

Save

Explore detailed ICD-10 coding for low T4, including specific codes for hypothyroidism, documentation requirements, and common pitfalls.

Also known as:

HypothyroidismThyroxine Deficiency

Related ICD-10 Code Ranges

Complete code families applicable to Low T4

E00-E89Primary Range

Endocrine, nutritional and metabolic diseases

→

Code Comparison: When to Use Each Code

Compare key differences between these codes to ensure accurate selection

Code	Description	When to Use	Key Documentation
E03.9	Hypothyroidism, unspecified	Use when hypothyroidism is confirmed but the specific cause is not documented.	TSH >4.5 mIU/L Free T4 <0.8 ng/dL Symptoms such as fatigue weight gain
E89.0	Postprocedural hypothyroidism	Use when hypothyroidism follows a surgical procedure involving the thyroid.	Documented history of thyroid surgery Low T4 and elevated TSH post-surgery
E03.2	Hypothyroidism due to drugs	Use when hypothyroidism is directly linked to medication use.	Temporal relationship between drug use and onset of hypothyroidism Low T4 and elevated TSH

Primary ICD-10-CM Codes

Hypothyroidism, unspecified

E03.9Billable

Differential Codes

Alternative codes to consider when ruling out similar conditions

Hypothyroidism due to drugsE03.2

Hypothyroidism, unspecifiedE03.9

Documentation & Coding Risks

Avoid these common issues when documenting Low T4.

Failing to document the cause of hypothyroidism.

Impact

Clinical: May lead to inappropriate treatment decisions., Regulatory: Could result in audit findings and penalties., Financial: May affect reimbursement rates.

Mitigation

Always document the etiology if known., Use specific codes when the cause is identified.

Using E03.9 without specifying the cause of hypothyroidism.

Impact

Reimbursement: May lead to lower reimbursement rates., Compliance: Could result in compliance issues during audits., Data Quality: Reduces the specificity and accuracy of clinical data.

Mitigation

Document the specific cause or use a more specific code if known.

Use of unspecified codes

Impact

Frequent use of unspecified codes like E03.9 can trigger audits.

Mitigation

Encourage detailed documentation and use of specific codes when possible.

Frequently Asked Questions

Documentation requirements, coding pitfalls and FAQs for conditions coded with E03.9.

Primary Code

E03.9

Hypothyroidism, unspecified

Quick Navigation

ICD-10 codes6

Coding risks3

FAQs2

ICD-10 Coding for Low T4(E03.9, E03.0, E03.1)

Documentation & Coding Risks

Frequently Asked Questions

What is the ICD-10 code for low T4?

How do you document low T4 in medical records?

Related condition guides