Loading...

    Explore
    • Policy Monitoring
    • Live Policy Feed
    • Billing Codes
    • NPI Medicare & Medicaid
    • Healthcare Providers
    • Health Insurance Payers
    • States
    • Service Lines
    • Taxonomy Codes
    Lookup tools
    • Billing Code Lookup
    • CPT Modifier Lookup
    • Provider Taxonomy Code Lookup
    • Healthcare Provider & Facility Lookup
    • Health Insurance Payer Lookup
    • Payer Contact Directory

    Policy & Benchmark Tools

    • Prior Authorization Lookup
    • Coverage Criteria Lookup
    • Timely Filing Lookup
    • Billing Code Reimbursement Rates
    • Payer Comparison Dashboard
    • Facility Comparison Dashboard
    • All tools

    Company

    • About OpenPayer
    • Data Sources
    • Trek Health
    OpenPayerby Trek Health
    LinkedInYouTube

    © 2026 Trek Health. All rights reserved.

    OpenPayer is built and maintained by Trek Health.

    v1.0.28
    OpenPayerBilling CodesDisorders of thyroid glandICD-10-CM e02-subclinical-iodine-deficiency-hypothyroidism
    Ask Trek AI about this page

    ICD-10-CM Code For Subclinical Iodine-Deficiency Hypothyroidism: Group Overview

    The International Classification of Diseases, Tenth Revision, Clinical Modification (ICD-10-CM) code group E02 includes subclinical hypothyroidism attributable to iodine deficiency, covering mild or early thyroid hormone insufficiency identified primarily by laboratory findings. These ICD-10-CM diagnosis codes are used to document patients with biochemical evidence of thyroid-stimulating hormone elevation without overt hypothyroid symptoms, capturing disease extent and need for monitoring. Accurate coding within the ICD-10-CM E02 group supports proper claim adjudication, complete clinical documentation, and appropriate reimbursement.

    Customize your policy alerts

    Sign up for ICD-10-CM Code For Subclinical Iodine-Deficiency Hypothyroidism: Group Overview policy alerts

    Get alerted when relevant policies change without checking for updates manually.

    Monitor payer policy activity

    Receive email alerts as soon as relevant payer policies are published or updated.

    ICD-10-CM E02: Subclinical Iodine-Deficiency Hypothyroidism Overview

    The diagnoses in this group represent subclinical hypothyroidism due to insufficient iodine intake, affecting thyroid hormone production and regulation. These conditions target the endocrine system, specifically thyroid function, and are identified by laboratory evidence of thyroid-stimulating hormone elevation with normal thyroxine levels in early or mild disease. Accurate coding matters because it supports complete clinical documentation and appropriate reimbursement for evaluation and monitoring of thyroid dysfunction.

    Table of contents

    Progress1 / 6

    Explore openpayer tools

    • Billing CodesCPT, HCPCS, DRG & more
    • Reimbursement RatesCommercial vs. Medicare rate reports
    • ProvidersHospitals & facilities
    • PayersPlans & market footprint
    • Taxonomy CodesNUCC specialty codes
    • ModifiersCPT modifiers & usage
    • Prior AuthorizationPA policies by payer & drug
    • Timely FilingFiling deadlines by payer
    • Coverage CriteriaMedical necessity by payer
    • Payer ContactsClaims, PA & appeals contacts
    View all tools

    When to Use

    Use a code from this group when laboratory testing shows elevated thyroid-stimulating hormone levels attributable to iodine deficiency while free thyroxine remains within reference range. Assign these codes for documentation of subclinical thyroid dysfunction to reflect disease etiology and to support appropriate follow-up care and billing.

    ICD-10-CM Codes

    1 rows

    ICD-10-CM CodeDescription
    E02Subclinical iodine-deficiency hypothyroidism

    DRG Codes

    3 rows

    DRG CodeDescription
    643Endocrine Disorders with MCC
    644Endocrine Disorders with CC
    645Endocrine Disorders without CC/MCC

    Typical Clinical Scenarios

    • An asymptomatic adult woman undergoing routine annual physical screening has a slightly elevated serum thyroid-stimulating hormone (TSH) level with normal free T4 on laboratory testing. She presents for follow-up to review results and discuss monitoring; because thyroid function is mildly abnormal without overt hypothyroid symptoms, a diagnosis from this group is assigned to document subclinical iodine-deficiency hypothyroidism and guide surveillance. Typical codes: E02
    • A pregnant patient in her first trimester is found to have an elevated TSH on prenatal screening while free T4 remains within the reference range; she has no signs of overt hypothyroidism but requires obstetric assessment and endocrinology consultation for potential impact on fetal development. The provider documents a subclinical hypothyroid state attributable to iodine deficiency as the reason for closer monitoring and possible intervention during pregnancy. Typical codes: E02
    • An elderly patient with chronic fatigue and mild cognitive slowing is evaluated in a geriatric clinic; labs show borderline high TSH with normal free T4, and dietary history reveals long-standing low iodine intake. The clinician assigns a diagnosis from this group to capture a chronic, non-acute thyroid dysfunction acting as a comorbidity that may contribute to functional decline and warrants ongoing follow-up. Typical codes: E02

    Related Codes

    E00-CONGENITAL-IODINE-DEFICIENCY-SYNDROME

    ICD-10-CM Code For Congenital Iodine-Deficiency Syndrome: Group Overview

    E01-IODINE-DEFICIENCY-THYROID-DISORDERS

    ICD-10-CM Code For Iodine-Deficiency Related Thyroid Disorders And Allied Conditions: Group Overview

    E03-OTHER-HYPOTHYROIDISM

    ICD-10-CM Code For Other Hypothyroidism: Group Overview

    E04-OTHER-NONTOXIC-GOITER

    ICD-10-CM Code For Other Nontoxic Goiter: Group Overview

    E05-THYROTOXICOSIS-HYPERTHYROIDISM

    ICD-10-CM Code For Thyrotoxicosis Hyperthyroidism: Group Overview

    E06-THYROIDITIS

    ICD-10-CM Code For Thyroiditis: Group Overview

    E07-OTHER-DISORDERS-OF-THYROID

    ICD-10-CM Code For Other Disorders Of Thyroid: Group Overview

    Frequently Asked Questions

    References

    1. 1.CPT® Codes and Descriptions. AAPC. Retrieved Aug 11, 2026.Maintains the CPT code set's official descriptions and guidelines, licensed from the American Medical Association, used as the definitional source for CPT codes on this page.
    2. 2.HCPCS Quarterly Update. Centers for Medicare & Medicaid Services (CMS). Retrieved Aug 11, 2026.CMS's quarterly release of HCPCS Level II codes and short/long descriptors, the source for HCPCS code definitions and update history.
    3. 3.ICD-10-CM Full Code List. Centers for Medicare & Medicaid Services (CMS). Retrieved Aug 11, 2026.CMS's complete ICD-10-CM diagnosis code list, used to cross-reference diagnosis codes associated with this procedure or service.
    Published by

    Trek Health powers OpenPayer with a leading commercial payer intelligence platform, seamlessly converting fragmented payer data into actionable insights for provider organizations.

    Trek Health ingests and normalizes Transparency in Coverage data and payer policy updates to give provider organizations a clear view of how commercial reimbursement behaves across markets, payers, and services. Our platform transforms raw payer disclosures into structured intelligence that supports contract evaluation, payer negotiations, and service line strategy. By combining market benchmarks with ongoing policy visibility, Trek helps teams identify variability, risk, and opportunity in commercial reimbursement. The result is faster insight, stronger negotiating positions, and more informed financial decisions.