ICD-10 Code for Thyrotoxicosis

The default ICD-10-CM 2027 code for thyrotoxicosis (recurrent) is E05.90 – Thyrotoxicosis, unspecified without thyrotoxic crisis or storm. More specific codes depend on the details documented, as listed in the official index (17 codes, 17 billable).

Main code: E05.90 – Thyrotoxicosis, unspecified without thyrotoxic crisis or storm
Billable: Yes

Index entries for Thyrotoxicosis

with
- goiter (diffuse) – E05.00
  - with thyroid storm – E05.01
  - adenomatous uninodular – E05.10
    - with thyroid storm – E05.11
  - multinodular – E05.20
    - with thyroid storm – E05.21
  - nodular – E05.20
    - with thyroid storm – E05.21
  - uninodular – E05.10
    - with thyroid storm – E05.11
- infiltrative
  - dermopathy – E05.00
    - with thyroid storm – E05.01
  - ophthalmopathy – E05.00
    - with thyroid storm – E05.01
- single thyroid nodule – E05.10
  - with thyroid storm – E05.11
- thyroid storm – E05.91
due to
- ectopic thyroid nodule or tissue – E05.30
  - with thyroid storm – E05.31
- ingestion of (excessive) – E05.40
  - with thyroid storm – E05.41
- overproduction of thyroid-stimulating hormone – E05.80
  - with thyroid storm – E05.81
- specified cause NEC – E05.80
  - with thyroid storm – E05.81
factitia – E05.40
- with thyroid storm – E05.41
heart – E05.90 – I43 [manifestation] – see also Failure, heart, high-output
- with thyroid storm – E05.91 – I43 [manifestation] – see also Failure, heart, high-output
- failure – E05.90 – I43 [manifestation] – see also Failure, heart, high-output
neonatal (transient) – P72.1
transient with chronic thyroiditis – E06.2

How to choose the right code

Start with the main term, then pick the indented subterm that matches the documentation (type, cause, site, laterality, episode of care). Always confirm the code in the tabular list: follow its Excludes1/Excludes2, “code first” and “use additional code” notes, and add a 7th character where required.

Source: CDC/NCHS ICD-10-CM FY2027 alphabetic index.