ICD-10 E03.9
Billable / SpecificHypothyroidism, unspecified
About ICD-10-CM E03.9
ICD-10-CM code E03.9 represents Hypothyroidism, unspecified. This is a billable/specific code in the Endocrine, Nutritional, and Metabolic chapter (block E03). The 2026 edition of ICD-10-CM E03.9 became effective on October 1, 2025.
Inclusion Terms / Approximate Synonyms
Clinical terms and conditions classified under E03.9. Per CMS ICD-10-CM Tabular 2026.
- Myxedema NOS
Medicare LCD Coverage for E03.9
Local Coverage Determinations (LCDs) from CMS MACs that list E03.9 as a covered diagnosis.
Showing top 10 of 47 total . Click a CPT for full coverage scope.
Commercial Payer Coverage
Coverage policies from major commercial payers referencing E03.9.
1 Cigna
1 Medicare
CPT Codes Commonly Billed with E03.9
Procedures frequently paired with this diagnosis based on PayerReady's Dx↔Px linkage data.
- 99204 New patient office visit — multiple chronic conditions: HTN, T2DM, hyperlipidemia, asthma, anxiety, depression, obesity, IBS, COPD, thyroid, anemia, CAD, sleep apnea, psoriasis, RA Primary Care
- 99213 Established patient — HTN follow-up, diabetes management, hyperlipidemia, asthma, anxiety, common complaints, back pain, GERD, migraine, acne, joint pain, prediabetes, obesity, anemia, hypothyroid, fatigue Primary Care
- 99214 Established patient — moderate complexity: uncontrolled HTN, diabetes with complications, multiple chronic conditions, COPD, AFib, CKD, sleep apnea, chronic pain, depression Primary Care
- 80053 Comprehensive metabolic panel — diabetes, HTN, CKD, hyperlipidemia, electrolyte disorders, anemia, thyroid, prediabetes, abnormal labs, routine exam, screening Laboratory
- 84443 TSH — hypothyroidism, hyperthyroidism, thyroiditis, weight loss, weight gain, post-surgical hypothyroidism, fatigue, routine exam, screening Laboratory
- 01782 CMS LCD: Billing and Coding: Monitored Anesthesia Care CMS LCD
- 01999 CMS LCD: Billing and Coding: Monitored Anesthesia Care CMS LCD
- 01829 CMS LCD: Billing and Coding: Monitored Anesthesia Care CMS LCD
- 00400 CMS LCD: Billing and Coding: Monitored Anesthesia Care CMS LCD
- 01922 CMS LCD: Billing and Coding: Monitored Anesthesia Care CMS LCD
Convert E03.9 to ICD-9-CM
Per CMS General Equivalence Mappings (GEMs), useful for legacy data review and historical claim analysis.
| ICD-10 | ICD-9 | Mapping Flags |
|---|---|---|
| E03.9 | 2449 | 00000 |
Flags format (5 digits): Approximate · No Map · Combination · Scenario · Choice List. Source: CMS 2017 GEMs (final version).
Codes Adjacent To E03.9
Other codes in section E00-E07 (Disorders of thyroid gland).
ICD-10 E03.9, Billing FAQ
Is ICD-10 code E03.9 billable? +
Yes, E03.9 is a billable ICD-10-CM code that can appear as a primary or secondary diagnosis on claims.
What other names or terms map to E03.9? +
ICD-10 E03.9 includes: Myxedema NOS.
What CPT codes are commonly billed with E03.9? +
Procedures frequently paired with E03.9 include: 99204, 99213, 99214, 80053, 84443.
What ICD-9 codes does E03.9 map to? +
Per CMS GEMs, E03.9 maps to ICD-9 codes: 2449. Useful for legacy data review and historical claim analysis.
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Reviewed by the PayerReady Medical Coding Team
Verified against the CMS 2026 code set on July 16, 2026.
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