ICD-10-CM › E05 › E05.9 E05.91 Thyrotoxicosis, unspecified with thyrotoxic crisis or stormBillable ICD-10-CM code, FY2026. Acts as a Major Complication or Comorbidity (MCC) as a secondary diagnosis.
Applies from E05 Thyrotoxicosis [hyperthyroidism] Excludes1 (never code together) chronic thyroiditis with transient thyrotoxicosis (E06.2) neonatal thyrotoxicosis (P72.1) Applies from E05.9 Thyrotoxicosis, unspecified Applicable to Risk adjustment (HCC) RxHCC V08: HCC 44 — Thyroid Disorders MS-DRG index Defines the logic of DRG(s) 011-013 in MDC PRE.
Approximate ICD-9-CM (GEMs) 242.91 Thyrotoxicosis without mention of goiter or other cause, with mention of thyrotoxic crisis or stormCode annotations containing back-references to E05.91 Back-references to E05.9 Code First: I43 Back-references to E05 Code First: G63 Code First: G73.3 Code First: G99.0 Code Also: I27.29 Code First: M14.8 Diagnosis Index entries for E05.91 Cardiomyopathy (familial) (idiopathic) › metabolic › thyrotoxic › with thyroid storm Cardiomyopathy (familial) (idiopathic) › thyrotoxic › with thyroid storm Chloasma (skin) (idiopathic) (symptomatic) › eyelid › hyperthyroid › with thyroid storm Disease, diseased › heart (organic) › hyperthyroid › with thyroid storm Disease, diseased › heart (organic) › thyrotoxic › with thyroid storm Disease, diseased › thyroid (gland) › heart › with thyroid storm Failure, failed › Note: heart failure stages A, B, C, and D are based on the American College of Cardiology and American Heart Association stages of heart failure, which complement and should not be confused with the New York Heart Association Classification of Heart Failure, into Class I, Class II, Class III, and Class IV › thyrotoxic › with › thyroid storm Hyperthyroidism (latent) (pre-adult) (recurrent) › with › storm Myasthenia › syndrome › in › thyrotoxicosis › with thyroid storm Myocardiopathy (congestive) (constrictive) (familial) (hypertrophic nonobstructive) (idiopathic) (infiltrative) (obstructive) (primary) (restrictive) (sporadic) › thyrotoxic › with storm Myopathy › in (due to) › thyrotoxicosis (hyperthyroidism) › with thyroid storm Myxedema (adult) (idiocy) (infantile) (juvenile) › circumscribed › with storm Myxedema (adult) (idiocy) (infantile) (juvenile) › localized (pretibial) › with storm Neuropathy, neuropathic › peripheral (nerve) › autonomic › in (due to) › hyperthyroidism › with thyroid storm Syndrome › myasthenic › in › thyrotoxicosis (hyperthyroidism) › with thyroid storm Thyrotoxic › heart disease or failure › with thyroid storm Thyrotoxicosis (recurrent) › with › thyroid storm Thyrotoxicosis (recurrent) › heart › with thyroid storm Nearby codes E05.8E05.80E05.81E05.9E05.90E05.91 Thyrotoxicosis, unspecified with thyrotoxic crisis or storm (this code)