E03.9 Hypothyroidism, unspecified

Billable ICD-10-CM code, FY2026.

Applicable to

• Myxedema 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)

• 244.9 Unspecified acquired hypothyroidism

Code annotations containing back-references to E03.9

Back-references to E03.9

• Code First: D63.8 Anemia in other chronic diseases classified elsewhere ("hypothyroidism (E00.0-E03.9)")
• 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: L98.5 Mucinosis of the skin ("myxedema (E03.9)")

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 E03.9

• Anemia (essential) (general) (hemoglobin deficiency) (infantile) (primary) (profound) › due to (in) (with) › myxedema
• Arthritis, arthritic (acute) (chronic) (nonpyogenic) (subacute) › in (due to) › hypothyroidism NEC
• Arthropathy › in (due to) › hypothyroidism
• Ataxia, ataxy, ataxic › cerebellar (hereditary) › in › myxedema
• Atrophy, atrophic (of) › systemic affecting central nervous system › in › myxedema
• Cataract (cortical) (immature) (incipient) › myxedema
• Degeneration, degenerative › brain (cortical) (progressive) › in › myxedema
• Dementia (degenerative (primary)) (persisting) (unspecified severity) (without behavioral disturbance, psychotic disturbance, mood disturbance, and anxiety) › in (due to) › hypothyroidism, acquired
• Dementia (degenerative (primary)) (persisting) (unspecified severity) (without behavioral disturbance, psychotic disturbance, mood disturbance, and anxiety) › in (due to) › hypothyroidism, acquired › with behavioral disturbance
• Hoffmann's syndrome
• Hypothyroidism (acquired)
• Insufficiency, insufficient › thyroid (gland) (acquired)
• Myopathy › in (due to) › hypothyroidism
• Myopathy › in (due to) › myxedema
• Myxedema (adult) (idiocy) (infantile) (juvenile)

Nearby codes

• 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
• E03.9 Hypothyroidism, unspecified (this code)