What is ICD-10 code E01.2?

E01.2 is the ICD-10-CM diagnosis code for Iodine-deficiency related (endemic) goiter, unspecified. It belongs to the ICD-10-CM chapter for endocrine, nutritional and metabolic diseases (e00-e89). E01.2 is a billable code, meaning it can be reported on a claim as a primary or secondary diagnosis when supported by documentation. E01.2 is part of the FY2026 ICD-10-CM code set published by the CMS National Center for Health Statistics and used on Medicare, Medicaid, and commercial claims in the United States.

Yes. E01.2 is a billable ICD-10-CM code that can be reported on professional and institutional claims as a primary or secondary diagnosis when the provider documentation supports the specific condition described. Billable codes in ICD-10-CM are coded to the highest level of specificity available for the documented diagnosis. E01.2 is current for fiscal year 2026 and remains in the active CMS ICD-10-CM code set published by the National Center for Health Statistics.

Which HCC does E01.2 map to under V28?

E01.2 does not map to a CMS-HCC V28 payment category. Check the current CMS-HCC V28 model file for payment year 2026 rather than an older V24 tip sheet.

What does E01.2 pay in RAF?

E01.2 has no separately stated V28 community RAF weight. If it is not a V28 payment HCC, it adds nothing to a community RAF score.

What is the V28 vs V24 difference for E01.2?

E01.2 does not map to a payment HCC under either the CMS-HCC V28 risk adjustment model or the older V24 model. V28 reached 100% phase-in for payment year 2026, replacing V24 which was used during the PY2024–PY2025 transition. Because neither community model rewards E01.2 with a risk adjustment factor, it contributes zero to a Medicare Advantage beneficiary's V28/V24 community RAF score in either version. It does, however, map under the Part D RxHCC model (Thyroid and Parathyroid Disorders), which affects the ESRD and/or Part D (RxHCC) risk scores. Coders should check whether provider documentation supports a more specific child code that does map to a community payment HCC.

What documentation supports E01.2?

Use this code only when iodine deficiency is documented as the cause and the goiter is endemic (occurring in a specific geographic region); do not use for non-endemic goiter If the medical record specifies the type of iodine-deficiency goiter (such as diffuse or nodular), use the more specific subcategories E01.0 or E01.1 instead of E01.2 E01.2 is not a CMS-HCC payment code, so MEAT is not the payment hook. Documentation still has to support the diagnosis if you report it.

2026 ICD-10-CM E01.2: Iodine-deficiency related (endemic)

E01.2 is not a CMS-HCC payment code. MEAT criteria · RAF calculator · HCC coding software

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Code lookupE01.2Effective periodFY2026 Apr Update (Apr 1-Sep 30)

FY 2026 Apr update / Endocrine, nutritional and metabolic diseases (E00-E89) / Disorders of thyroid gland (E00-E07)

E01.2

Billable / SpecificICD-10-CMOfficial ICD-10-CMCodebook guidance

Iodine-deficiency related (endemic) goiter, unspecified

This code describes an enlarged thyroid gland (goiter) caused by iodine deficiency in areas where this condition is common in the population. The specific type or severity of the goiter is not specified in the medical record.

Buddy Insight

Iodine-deficiency related (endemic) goiter, unspecified, captures thyroid enlargement due to iodine deficiency where the morphology (diffuse versus multinodular) has not been specified.

CMS-HCC V28

N/A

—

Not risk-adjusted for this model/period.

Not mapped

CMS-HCC V24

N/A

—

Not risk-adjusted for this model/period.

Not mapped

ACA/HHS

N/A

—

Not risk-adjusted for this model/period.

Not mapped

ESRD/PACE

N/A

—

Not risk-adjusted for this model/period.

Not mapped

RXHCC

Mapped

HCC 44

Thyroid and Parathyroid Disor...

RAF 0.070

Code Book Path

Official

E01Iodine-deficiency related thyroid disorders and allied conditions

E01.2Iodine-deficiency related (endemic) goiter, unspecified

Inclusion Terms

Official

Endemic goiter NOS

Excludes 2

Official

ICD-10-CM does not list Excludes 2 notes for E01.2 in this effective period.

Related Child Codes

Official

E01.0Iodine-deficiency related diffuse (endemic) goiter

E01.1Iodine-deficiency related multinodular (endemic) goiter

E01.8Other iodine-deficiency related thyroid disorders and allied conditions

Includes

Official

ICD-10-CM does not list Includes notes for E01.2 in this effective period.

Excludes 1

Official

congenital iodine-deficiency syndrome (E00.-)
subclinical iodine-deficiency hypothyroidism (E02)

Code First

Official

ICD-10-CM does not list Code First sequencing instructions for E01.2 in this effective period.

Use Additional

Official

ICD-10-CM does not list Use Additional Code instructions for E01.2 in this effective period.

Code Also

Official

ICD-10-CM does not list Code Also instructions for E01.2 in this effective period.

Buddy Documentation Tip

HCC Buddy guidance

Documentation must confirm iodine-deficiency as the cause of the goiter.

The provider should be queried to specify whether the goiter is diffuse or multinodular, ideally based on ultrasound findings.

Thyroid function tests and any symptoms related to goiter size should be documented.

This code should be considered temporary pending more specific morphological characterization.

MEAT Support

HCC Buddy guidance

Documentation must confirm iodine-deficiency as the cause of the goiter.

The provider should be queried to specify whether the goiter is diffuse or multinodular, ideally based on ultrasound findings.

Thyroid function tests and any symptoms related to goiter size should be documented.

This code should be considered temporary pending more specific morphological characterization.

Audit Caution

HCC Buddy guidance

Avoid using this unspecified code when imaging or clinical examination has determined whether the goiter is diffuse or multinodular.

Provider queries should be submitted to obtain morphological specificity.

Do not assign this code when the goiter is not related to iodine deficiency.

Ensure thyroid function is documented to identify subclinical or overt hypothyroidism or thyrotoxicosis.

Common Mistakes

HCC Buddy guidance

E01.0 (Iodine-deficiency related diffuse goiter) and E01.1 (Iodine-deficiency related multinodular goiter) are more specific alternatives.

E04.9 (Nontoxic goiter, unspecified) captures unspecified goiter without iodine-deficiency etiology.

E04.0 (Nontoxic diffuse goiter) and E04.2 (Nontoxic multinodular goiter) are non-endemic alternatives.

Current with CMS: FY2026 ICD-10-CM Apr 1 update (effective Apr 1 – Sep 30, 2026) · CMS-HCC V28, 100% phased in for payment year 2026. FY2027 code set already staged for October 1, 2026. How HCC Buddy stays current →

Is E01.2 an HCC code?

E01.2 is not in the CMS-HCC V28 or V24 community payment model, but it does map to Thyroid and Parathyroid Disorders under the Part D RxHCC model.

Code: E01.2
Description: Iodine-deficiency related (endemic) goiter, unspecified
HCC (V28): No CMS-HCC V28 mapping
RAF: —
Billable: Yes
Payment year: 2026

HCC Category Mapping

RxHCCHCC 44, Thyroid and Parathyroid Disorders

0.070

Each model's RAF is its CMS base weight for that model's standard population, so weights are not directly comparable across models: CMS-HCC V28 and V24 use Community, Non-Dual, Aged; ESRD uses the dialysis continuing-enrollee model; RxHCC is the Part D continuing-enrollee, non-low-income, aged weight (a larger scale than CMS-HCC). ACA/HHS has no single weight — it varies by metal level. Actual per-patient RAF contribution depends on member segment, interactions, and the model year used by the payer. V28 is the CMS-HCC model phased in over payment years 2024–2026; V24 remains in use during the transition and for historical data.

Work E01.2 in the Code Book — tabular path, V28 RAF, and MEAT checklist →

MEAT Criteria for E01.2

For E01.2 to count as a valid HCC diagnosis in a given encounter, the provider's documentation must show MEAT: Monitor, Evaluate, Assess, or Treat. A diagnosis from a prior year does not carry forward automatically, it has to be re-documented and supported each calendar year.

MMonitor: signs, symptoms, disease progression, or lab trending documented in the note
EEvaluate: test results, medication response, or physical findings reviewed by the provider
AAssess: explicit mention in the assessment or plan with acknowledgment of status
TTreat: medication, referral, procedure, therapy, or counseling tied to the diagnosis

Only one of M/E/A/T is required to support the code, but the documentation must be specific enough to show that the provider actually addressed E01.2 during that encounter, not just copy-forwarded from a problem list.

Coder workflow notes

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What This Code Means

E01.2 is the ICD-10-CM diagnosis code for iodine-deficiency related (endemic) goiter, unspecified. This code describes an enlarged thyroid gland (goiter) caused by iodine deficiency in areas where this condition is common in the population. The specific type or severity of the goiter is not specified in the medical record. E01.2 sits in the ICD-10-CM chapter for endocrine, nutritional and metabolic diseases (e00-e89), within the section covering disorders of thyroid gland (e00-e07).

E01.2 is a billable ICD-10-CM code but does not map to a payment HCC under the CMS-HCC V28, V24, ESRD, or RxHCC risk adjustment models. It can be reported on Medicare Advantage encounter data submissions but it does not contribute to a beneficiary's RAF score and therefore does not affect risk-adjusted payments to the plan.

This code does not map to a CMS-HCC V28 payment category. Capture depends on documentation that supports the diagnosis; verify the HCC assignment against the current CMS mapping for the applicable payment year. Coders reviewing E01.2 should check whether additional documentation would support a more specific child code in the same hierarchy that does map to a payment HCC, capturing the correct specificity is the highest-impact RAF improvement available within accurate coding.

HCC Buddy maintains structured V28 and V24 mapping, RAF weights, and MEAT documentation criteria for E01.2 sourced directly from the CMS-HCC risk adjustment model files and the CMS ICD-10-CM code set.

Coding Tips

•Use this code only when iodine deficiency is documented as the cause and the goiter is endemic (occurring in a specific geographic region); do not use for non-endemic goiter
•If the medical record specifies the type of iodine-deficiency goiter (such as diffuse or nodular), use the more specific subcategories E01.0 or E01.1 instead of E01.2

Clinical Significance

Iodine-deficiency related (endemic) goiter, unspecified, captures thyroid enlargement due to iodine deficiency where the morphology (diffuse versus multinodular) has not been specified. This is a less clinically informative code that should prompt further characterization through thyroid imaging. The distinction between diffuse and multinodular patterns has implications for monitoring and management strategies.

Documentation Requirements

✓Documentation must confirm iodine-deficiency as the cause of the goiter.
✓The provider should be queried to specify whether the goiter is diffuse or multinodular, ideally based on ultrasound findings.
✓Thyroid function tests and any symptoms related to goiter size should be documented.
✓This code should be considered temporary pending more specific morphological characterization.

Commonly Confused Codes

•E01.0 (Iodine-deficiency related diffuse goiter) and E01.1 (Iodine-deficiency related multinodular goiter) are more specific alternatives.
•E04.9 (Nontoxic goiter, unspecified) captures unspecified goiter without iodine-deficiency etiology.
•E04.0 (Nontoxic diffuse goiter) and E04.2 (Nontoxic multinodular goiter) are non-endemic alternatives.