E03.1 Congenital hypothyroidism without goiter

Billable ICD-10-CM code, FY2026.

Applicable to

• Aplasia of thyroid (with myxedema)
• Congenital atrophy of thyroid
• Congenital hypothyroidism NOS

Applies from E03 Other hypothyroidism

Excludes1 (never code together)

• iodine-deficiency related hypothyroidism (E00-E02)
• postprocedural hypothyroidism (E89.0)

Risk adjustment (HCC)

• RxHCC V08: HCC 44 — Thyroid Disorders

MS-DRG index

Defines the logic of DRG(s) 643-645 in MDC 10.

Approximate ICD-9-CM (GEMs)

• 243 Congenital hypothyroidism (approximate)

Code annotations containing back-references to E03.1

Back-references to E03.1

• Code First: D63.8 Anemia in other chronic diseases classified elsewhere ("hypothyroidism (E00.0-E03.9)")
• Type 1 Excludes: E03.4 Atrophy of thyroid (acquired) ("congenital atrophy of thyroid (E03.1)")
• Code First: G32.8 Other specified degenerative disorders of nervous system in diseases classified elsewhere ("cerebral degeneration (due to) hypothyroidism (E00.0-E03.9)")
• Type 1 Excludes: P72 Other transitory neonatal endocrine disorders ("congenital hypothyroidism with or without goiter (E03.0-E03.1)")
• Type 1 Excludes: Q89.2 Congenital malformations of other endocrine glands ("congenital hypothyroidism (E03.1)")

Back-references to E03

• Code First: F02 Dementia in other diseases classified elsewhere ("hypothyroidism, acquired (E00-E03.-)")
• Code First: G13.2 Systemic atrophy primarily affecting the central nervous system in myxedema ("hypothyroidism (E03.-)")
• Code First: G63 Polyneuropathy in diseases classified elsewhere ("endocrine disease, except diabetes (E00-E07, E15-E16, E20-E34)")
• Code First: H28 Cataract in diseases classified elsewhere ("myxedema (E03.-)")
• Code Also: I27.29 Other secondary pulmonary hypertension ("hypothyroidism (E00-E03)")
• Code First: M14.8 Arthropathies in other specified diseases classified elsewhere ("hypothyroidism (E00-E03)")

Diagnosis Index entries for E03.1

• Absence (of) (organ or part) (complete or partial) › thyroid (gland) (acquired) › congenital
• Agenesis › thyroid (gland)
• Aplasia › thyroid (congenital) (with myxedema)
• Athyrea (acquired) › congenital
• Atrophy, atrophic (of) › thyroid (gland) (acquired) › with cretinism
• Atrophy, atrophic (of) › thyroid (gland) (acquired) › congenital (with myxedema)
• Hypoplasia, hypoplastic › thyroid (gland)
• Hypothyroidism (acquired) › congenital (without goiter)
• Insufficiency, insufficient › thyroid (gland) (acquired) › congenital
• Jaundice (yellow) › newborn › due to or associated with › hypothyroidism, congenital
• Subthyroidism (acquired) › congenital

Nearby codes

• E03 Other hypothyroidism
• E03.0 Congenital hypothyroidism with diffuse goiter
• E03.1 Congenital hypothyroidism without goiter (this code)
• E03.2 Hypothyroidism due to medicaments and other exogenous substances
• E03.3 Postinfectious hypothyroidism
• E03.4 Atrophy of thyroid (acquired)
• E03.5 Myxedema coma
• E03.8 Other specified hypothyroidism