2026 ICD-10-CM Diagnosis Code E05.40Thyrotoxicosis factitia without thyrotoxic crisis or storm
ICD-10-CM Codes›E00–E89›E00-E07›E05
- Billable — Valid for Submission
- Chronic Condition
E05.40 is a billable ICD-10-CM diagnosis code for thyrotoxicosis factitia without thyrotoxic crisis or storm. It is valid on HIPAA claims for fiscal year 2026 (October 1, 2025 through September 30, 2026) and groups to MS-DRG 11 through 13, 643 through 645. Coders also document this condition as iatrogenic thyrotoxicosis. In AHRQ's Clinical Classifications Software (CCSR), this diagnosis falls under Thyroid disorders.
E05.40 does not risk-adjust for Medicare Advantage under the CMS-HCC V28 model. It still risk-adjusts in the RxHCC Part D (V08) category 44 for payment year 2026.
Code Identity
Code Classification
Medicare Risk Adjustment (HCC)Billing
E05.40 does not risk-adjust for Medicare Advantage under the CMS-HCC V28 model, but it maps to payment categories in the other CMS models shown below.
Source: CMS Payment Year 2026 risk adjustment mappings and model software. Weights are relative factors, not dollar amounts; a beneficiary's total RAF also includes demographics and interactions. Browse all CMS-HCC categories.
Approximate SynonymsGuidance
Alternate terms and clinical phrases that map to this code.
- Iatrogenic thyrotoxicosis
- Iatrogenic thyrotoxicosis factitia
- Thyrotoxicosis factitia
- Thyrotoxicosis factitia without thyrotoxic crisis
- Thyrotoxicosis on thyroxine therapy
Index to Diseases and InjuriesGuidance
Alphabetical index entries that point to this code.
Clinical ClassificationClinical
AHRQ’s CCSR groups this code into broader clinical categories.
Patient EducationClinical
Hyperthyroidism
Hyperthyroidism, or overactive thyroid, happens when your thyroid gland makes more thyroid hormones than your body needs.
The full article covers:
- What is hyperthyroidism?
- What causes hyperthyroidism?
- Who is at risk for hyperthyroidism?
- What are the symptoms of hyperthyroidism?
- What other problems can hyperthyroidism cause?
- How is hyperthyroidism diagnosed?
- What are the treatments for hyperthyroidism?
Read the full article at MedlinePlus
Courtesy of MedlinePlus, a service of the U.S. National Library of Medicine.
Convert E05.40 to ICD-9-CMHistory
The closest ICD-9-CM equivalents under the General Equivalence Mappings.
Code HistoryHistory
Questions About E05.40Overview
What is the ICD-10 code for thyrotoxicosis factitia without thyrotoxic crisis or storm?
The ICD-10-CM code for thyrotoxicosis factitia without thyrotoxic crisis or storm is E05.40 (sometimes written as E0540). It is billable on HIPAA-covered claims from October 1, 2025 through September 30, 2026.
Is E05.40 (Thyrotoxicosis factitia) a billable code?
Yes. This is a billable ICD-10-CM code, specific enough to report thyrotoxicosis factitia without thyrotoxic crisis or storm on HIPAA-covered claims from October 1, 2025 through September 30, 2026.
What MS-DRG does E05.40 group to?
When thyrotoxicosis factitia without thyrotoxic crisis or storm is the principal diagnosis on an inpatient stay, it groups to MS-DRG 11, 12, 13, 643, 644, 645, with relative weights from 0.7683 to 5.4541 depending on complications. Higher weights mean higher Medicare reimbursement.
What is the ICD-9 equivalent of E05.40?
Under the General Equivalence Mappings, thyrotoxicosis factitia without thyrotoxic crisis or storm converts to ICD-9-CM 242.80 (thyrtox orig NEC no cris). The mapping is approximate, so confirm the match fits the documentation.
Does E05.40 risk-adjust for Medicare Advantage payment?
Not for Medicare Advantage: E05.40 maps to no category in the CMS-HCC V28 model. It still risk-adjusts in the RxHCC Part D (V08) category 44 (Thyroid Disorders).
