2026 ICD-10-CM Diagnosis Code E02Subclinical iodine-deficiency hypothyroidism
ICD-10-CM Codes›E00–E89›E00-E07›E02
- Billable — Valid for Submission
- Chronic Condition
E02 is a billable ICD-10-CM diagnosis code for subclinical iodine-deficiency hypothyroidism. It is valid on HIPAA claims for fiscal year 2026 (October 1, 2025 through September 30, 2026) and groups to MS-DRG 643 through 645. Coders also document this condition as iodine hypothyroidism. In AHRQ's Clinical Classifications Software (CCSR), this diagnosis falls under Thyroid disorders.
E02 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
E02 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.
- Iodine hypothyroidism
- Myxedema coma
- Myxedema coma due to subclinical hypothyroidism
- Subclinical disease AND/OR syndrome
- Subclinical hypothyroidism
- Subclinical iodine deficiency hypothyroidism
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
Hypothyroidism
Hypothyroidism, or underactive thyroid, happens when your thyroid gland doesn't make enough thyroid hormones to meet your body's needs.
The full article covers:
- What is hypothyroidism?
- What causes hypothyroidism?
- Who is at risk for hypothyroidism?
- What are the symptoms of hypothyroidism?
- What other problems can hypothyroidism cause?
- How is hypothyroidism diagnosed?
- What are the treatments for hypothyroidism?
Read the full article at MedlinePlus
Courtesy of MedlinePlus, a service of the U.S. National Library of Medicine.
Convert E02 to ICD-9-CMHistory
The closest ICD-9-CM equivalents under the General Equivalence Mappings.
Code HistoryHistory
Questions About E02Overview
What is the ICD-10 code for subclinical iodine-deficiency hypothyroidism?
The ICD-10-CM code for subclinical iodine-deficiency hypothyroidism is E02. It is billable on HIPAA-covered claims from October 1, 2025 through September 30, 2026.
Is E02 (Subclinical iodine-deficiency hypothyroidism) a billable code?
Yes. This is a billable ICD-10-CM code, specific enough to report subclinical iodine-deficiency hypothyroidism on HIPAA-covered claims from October 1, 2025 through September 30, 2026.
What MS-DRG does E02 group to?
When subclinical iodine-deficiency hypothyroidism is the principal diagnosis on an inpatient stay, it groups to MS-DRG 643, 644, 645, with relative weights from 0.7683 to 1.6461 depending on complications. Higher weights mean higher Medicare reimbursement.
What is the ICD-9 equivalent of E02?
Under the General Equivalence Mappings, subclinical iodine-deficiency hypothyroidism converts to ICD-9-CM 244.8 (acquired hypothyroid NEC). The mapping is approximate, so confirm the match fits the documentation.
Does E02 risk-adjust for Medicare Advantage payment?
Not for Medicare Advantage: E02 maps to no category in the CMS-HCC V28 model. It still risk-adjusts in the RxHCC Part D (V08) category 44 (Thyroid Disorders).
