ICD-10-CM 2027
ICD-10 code for thyrotoxicosis
From the official ICD-10-CM alphabetic index entry “Thyrotoxicosis (recurrent)”. Page updated September 29, 2026.
About coding thyrotoxicosis
The ICD-10-CM code for thyrotoxicosis is E05.90 (Thyrotoxicosis, unspecified without thyrotoxic crisis or storm). The official index lists 32 more specific codes, so check the documentation for details such as type, cause, site or severity before settling on E05.90.
Within E05.9, choose E05.90 (without thyrotoxic crisis or storm) only when documentation doesn't support a more specific option: with thyrotoxic crisis or storm (E05.91).
It is not a CC or MCC, so as a secondary diagnosis it doesn't change the MS-DRG severity level.
In MS-DRG v44.0, it is part of the grouping logic for DRG 011 (Tracheostomy for Face, Mouth and Neck Diagnoses or Laryngectomy with MCC, relative weight 5.6154), DRG 012 (Tracheostomy for Face, Mouth and Neck Diagnoses or Laryngectomy with CC, relative weight 4.381), DRG 013 (Tracheostomy for Face, Mouth and Neck Diagnoses or Laryngectomy without CC/MCC, relative weight 2.7307), DRG 643 (Endocrine Disorders with MCC, relative weight 1.6139), DRG 644 (Endocrine Disorders with CC, relative weight 1.0044) and DRG 645 (Endocrine Disorders without CC/MCC, relative weight 0.7459), in Pre-MDC and MDC 10 (Endocrine, Nutritional and Metabolic Diseases and Disorders), as a principal or secondary diagnosis. The DRG a claim lands in depends on the principal diagnosis, procedures and any CC/MCC secondary diagnoses.
More specific thyrotoxicosis codes (official index)
- with
- goiter (diffuse) E05.00 — Thyrotoxicosis with diffuse goiter without thyrotoxic crisis or storm
- with thyroid storm E05.01 — Thyrotoxicosis with diffuse goiter with thyrotoxic crisis or storm
- adenomatous uninodular E05.10 — Thyrotoxicosis with toxic single thyroid nodule without thyrotoxic crisis or storm
- with thyroid storm E05.11 — Thyrotoxicosis with toxic single thyroid nodule with thyrotoxic crisis or storm
- multinodular E05.20 — Thyrotoxicosis with toxic multinodular goiter without thyrotoxic crisis or storm
- with thyroid storm E05.21 — Thyrotoxicosis with toxic multinodular goiter with thyrotoxic crisis or storm
- nodular E05.20 — Thyrotoxicosis with toxic multinodular goiter without thyrotoxic crisis or storm
- with thyroid storm E05.21 — Thyrotoxicosis with toxic multinodular goiter with thyrotoxic crisis or storm
- uninodular E05.10 — Thyrotoxicosis with toxic single thyroid nodule without thyrotoxic crisis or storm
- with thyroid storm E05.11 — Thyrotoxicosis with toxic single thyroid nodule with thyrotoxic crisis or storm
- infiltrative
- dermopathy E05.00 — Thyrotoxicosis with diffuse goiter without thyrotoxic crisis or storm
- with thyroid storm E05.01 — Thyrotoxicosis with diffuse goiter with thyrotoxic crisis or storm
- ophthalmopathy E05.00 — Thyrotoxicosis with diffuse goiter without thyrotoxic crisis or storm
- with thyroid storm E05.01 — Thyrotoxicosis with diffuse goiter with thyrotoxic crisis or storm
- single thyroid nodule E05.10 — Thyrotoxicosis with toxic single thyroid nodule without thyrotoxic crisis or storm
- with thyroid storm E05.11 — Thyrotoxicosis with toxic single thyroid nodule with thyrotoxic crisis or storm
- thyroid storm E05.91 — Thyrotoxicosis, unspecified with thyrotoxic crisis or storm
- due to
- ectopic thyroid nodule or tissue E05.30 — Thyrotoxicosis from ectopic thyroid tissue without thyrotoxic crisis or storm
- with thyroid storm E05.31 — Thyrotoxicosis from ectopic thyroid tissue with thyrotoxic crisis or storm
- ingestion of (excessive) thyroid material E05.40 — Thyrotoxicosis factitia without thyrotoxic crisis or storm
- with thyroid storm E05.41 — Thyrotoxicosis factitia with thyrotoxic crisis or storm
- overproduction of thyroid-stimulating hormone E05.80 — Other thyrotoxicosis without thyrotoxic crisis or storm
- with thyroid storm E05.81 — Other thyrotoxicosis with thyrotoxic crisis or storm
- specified cause NEC E05.80 — Other thyrotoxicosis without thyrotoxic crisis or storm
- with thyroid storm E05.81 — Other thyrotoxicosis with thyrotoxic crisis or storm
- factitia E05.40 — Thyrotoxicosis factitia without thyrotoxic crisis or storm
- with thyroid storm E05.41 — Thyrotoxicosis factitia with thyrotoxic crisis or storm
- heart E05.90 — Thyrotoxicosis, unspecified without thyrotoxic crisis or storm
- with thyroid storm E05.91 — Thyrotoxicosis, unspecified with thyrotoxic crisis or storm
- failure E05.90 — Thyrotoxicosis, unspecified without thyrotoxic crisis or storm
- neonatal (transient) P72.1 — Transitory neonatal hyperthyroidism
- transient with chronic thyroiditis E06.2 — Chronic thyroiditis with transient thyrotoxicosis
Common questions about thyrotoxicosis ICD-10 codes
What is the ICD-10 code for thyrotoxicosis?
- E05.90 — Thyrotoxicosis, unspecified without thyrotoxic crisis or storm. More specific codes apply when the documentation supports them: E05.00, E05.01, E05.10, E05.11 and others below.
What is the ICD-10 code for factitia thyrotoxicosis?
- E05.40 — Thyrotoxicosis factitia without thyrotoxic crisis or storm.
What is the ICD-10 code for heart thyrotoxicosis?
- E05.90 — Thyrotoxicosis, unspecified without thyrotoxic crisis or storm.
What is the ICD-10 code for neonatal thyrotoxicosis?
- P72.1 — Transitory neonatal hyperthyroidism.
What is the ICD-10 code for transient with chronic thyroiditis thyrotoxicosis?
- E06.2 — Chronic thyroiditis with transient thyrotoxicosis.
Is E05.90 billable?
- Yes. E05.90 is a billable/specific ICD-10-CM code valid for FY2027 (October 1, 2026 – September 30, 2027).
Can E05.90 be used as a principal diagnosis?
- Yes. The Medicare Code Editor doesn't restrict E05.90 as a principal diagnosis.
Is E05.90 a CC or MCC?
- No. E05.90 is neither a CC nor an MCC under MS-DRG v44.0.