E03.8 ICD-10-CM Code: Other specified hypothyroidism
E03.8 is not a CMS-HCC payment code. MEAT criteria · RAF Calculator · HCC Buddy coding tools
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FY 2026 Apr update / Endocrine, nutritional and metabolic diseases (E00-E89) / Disorders of thyroid gland (E00-E07)
E03.8
Billable / SpecificICD-10-CMOfficial ICD-10-CMCodebook guidanceOther specified hypothyroidism
Hypothyroidism caused by specific conditions other than the more common types, such as medication-induced or secondary to other diseases.
Buddy Insight
Other specified hypothyroidism captures diagnosed hypothyroid conditions that have a specified etiology not covered by the more specific E03 subcategories.
CMS-HCC V28
N/A—
Not mapped
CMS-HCC V24
HistoricalHistorical
Not used for CY2026 payment
ACA/HHS
N/A—
Not mapped
ESRD/PACE
N/A—
Not mapped
RXHCC
MappedHCC 44
Code-level coefficient reference
Code Book Path
Inclusion Terms
OfficialNo inclusion terms are included in this display for E03.8. Check the code and parent instructions in the Code Book.
Excludes 2
OfficialNo Excludes 2 notes are included in this display for E03.8. Check the code and parent instructions in the Code Book.
Related Codes
Includes
OfficialNo Includes notes are included in this display for E03.8. Check the code and parent instructions in the Code Book.
Excludes 1
Official- transitory endocrine and metabolic disorders specific to newborn (P70-P74)Inherited from E00-E89, E03
- iodine-deficiency related hypothyroidism (E00-E02)Inherited from E00-E89, E03
- postprocedural hypothyroidism (E89.0)Inherited from E00-E89, E03
Code First
OfficialNo Code First sequencing instructions are included in this display for E03.8. Check the code and parent instructions in the Code Book.
Use Additional
OfficialNo Use Additional Code instructions are included in this display for E03.8. Check the code and parent instructions in the Code Book.
Code Also
OfficialNo Code Also instructions are included in this display for E03.8. Check the code and parent instructions in the Code Book.
Buddy Documentation Tip
MEAT Support
Audit Caution
Common Mistakes
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 E03.8 an HCC code?
E03.8 is not in the CMS-HCC V28 or V24 community payment model. E03.8 has a separate mapping under the Part D RxHCC model (HCC 44 (Thyroid Disorders)); the applicable result needs member context.
- Code
- E03.8
- Description
- Other specified hypothyroidism
- HCC (V28)
- No CMS-HCC V28 mapping
- RAF reference coefficient
- —
- Billable
- Yes
- Payment year
- 2026
HCC Category Mapping
These are source-labeled model coefficients, not member totals. A category may still be removed by hierarchy or model cleanup rules. 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 context, hierarchy and cleanup rules, interactions, and the model year used by the payer. V28 is the CMS-HCC model phased in over payment years 2024–2026; V24 remains available for historical review.
Work E03.8 in the Code Book — tabular path, V28 RAF reference, and MEAT checklist →
MEAT review for E03.8
For E03.8, confirm that the documentation supports the diagnosis and meets the applicable coding, encounter, program and payer requirements. MEAT (Monitor, Evaluate, Assess, or Treat) is a review mnemonic, not a universal CMS coding rule.
- 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
Coder workflow notes
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What This Code Means
E03.8 is the ICD-10-CM diagnosis code for other specified hypothyroidism. Hypothyroidism caused by specific conditions other than the more common types, such as medication-induced or secondary to other diseases. E03.8 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).
E03.8 has no mapping under the CMS-HCC V28 or V24 community payment models. E03.8 has a separate mapping under the Part D RxHCC model (HCC 44 (Thyroid Disorders)); the applicable result needs member context. Do not assign V28 risk adjustment value from this page; verify the applicable model and payment year before using this code for risk adjustment.
Use this code only when the hypothyroidism doesn't fit into categories E03.0-E03.7; always specify the underlying cause in documentation.
HCC Buddy maintains structured V28 and V24 mapping, source-labeled coefficient references, and MEAT documentation criteria for E03.8 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 the hypothyroidism doesn't fit into categories E03.0-E03.7; always specify the underlying cause in documentation
- •Review the medical record for iatrogenic causes (medications like amiodarone, lithium) or systemic conditions
Clinical Significance
Other specified hypothyroidism captures diagnosed hypothyroid conditions that have a specified etiology not covered by the more specific E03 subcategories. This includes hypothyroidism from causes such as infiltrative diseases (amyloidosis, hemochromatosis involving the thyroid), secondary hypothyroidism from pituitary or hypothalamic disease when not coded elsewhere, and other rare causes of thyroid underfunction. The clinical impact depends on the underlying etiology and severity.
Documentation Requirements
- ✓Documentation must specify the particular type of hypothyroidism that does not fit other E03 subcategories.
- ✓The underlying cause, thyroid function test results, and current treatment should be documented.
- ✓If secondary (central) hypothyroidism is present, documentation should include pituitary or hypothalamic imaging and additional anterior pituitary hormone assessments.
- ✓Treatment response and levothyroxine dosing should be recorded.
Commonly Confused Codes
- •E03.9 (Hypothyroidism, unspecified) is used when the type has not been determined.
- •E03.2 (Hypothyroidism due to medicaments) captures drug-induced hypothyroidism.
- •E89.0 (Postprocedural hypothyroidism) captures post-surgical or post-ablation hypothyroidism.
- •E23.0 (Hypopituitarism) may cause secondary hypothyroidism and should be coded as the underlying condition when applicable.