2027 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 2027 (October 1, 2026 through September 30, 2027) 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 2027.
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 2027 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
Instructional NotesGuidance
Instructions from the official ICD-10-CM Tabular List that apply to E02: its own notes plus those printed at Chapter 4. A note printed at a category, block or chapter applies to every code under it.
Excludes1
Not coded here: the excluded code is never reported together with this one, unless the two conditions are unrelated.
Notes
General instructions on how these codes are used.
- All neoplasms, whether functionally active or not, are classified in Chapter 2. Appropriate codes in this chapter (i.e. E05.8, E07.0, E16-E31, E34.-) may be used as additional codes to indicate either functional activity by neoplasms and ectopic endocrine tissue or hyperfunction and hypofunction of endocrine glands associated with neoplasms and other conditions classified elsewhere.
Source: CMS ICD-10-CM Tabular List. How to read instructional notes.
Referenced in Other NotesGuidance
Instructional notes printed at other codes that name E02, its category, or a range that includes it.
Applicable To 1
These notes mention E02.
- Z83.4 Family history of other endocrine, nutritional and metabolic diseases
Excludes1 5
These codes carry an Excludes1 note naming E02: they are not reported together with it, unless the two conditions are unrelated.
- E00 Congenital iodine-deficiency syndromesubclinical iodine-deficiency hypothyroidism (E02)
- E01 Iodine-deficiency related thyroid disorders and allied conditionssubclinical iodine-deficiency hypothyroidism (E02)
- E03 Other hypothyroidism
- E04 Other nontoxic goiter
- E61 Deficiency of other nutrient elements
Excludes2 1
These codes carry an Excludes2 note naming E02: its condition is not part of those codes, and both may be reported when the patient has both.
- Q86 Congenital malformation syndromes due to known exogenous causes, not elsewhere classified
Code First 5
These codes say to code first a condition named in the note, and E02 is one of the conditions named.
- D63.8 Anemia in other chronic diseases classified elsewhere
- F02 Dementia in other diseases classified elsewhere
- G32.8 Other specified degenerative disorders of nervous system in diseases classified elsewhere
- G63 Polyneuropathy in diseases classified elsewhere
- M14.8 Arthropathies in other specified diseases classified elsewhere
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, 2026 through September 30, 2027.
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, 2026 through September 30, 2027.
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 644, 645, 643, with relative weights from 0.7461 to 1.6138 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).
