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    v1.0.28
    OpenPayerBilling CodesDisorders of other endocrine glandsICD-10-CM e20-hypoparathyroidism
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    ICD-10-CM Code For Hypoparathyroidism: Group Overview

    The International Classification of Diseases, Tenth Revision, Clinical Modification (ICD-10-CM) code group E20 includes diagnoses for hypoparathyroidism and related disorders characterized by deficient parathyroid hormone production or function, including postsurgical, autoimmune, congenital, and idiopathic causes. These ICD-10-CM diagnosis codes are used to document clinical scenarios involving hypocalcemia, neuromuscular irritability, tetany, or chronic management needs related to low parathyroid hormone activity. Accurate coding within the ICD-10-CM E20 group supports proper claim adjudication and complete clinical documentation and appropriate reimbursement.

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    ICD-10-CM E20: Hypoparathyroidism Overview

    The ICD-10-CM E20 group represents disorders characterized by deficient parathyroid hormone production or function leading to low calcium levels and related metabolic disturbances. These diagnoses target the parathyroid glands and their role in calcium and phosphorus homeostasis. Accurate coding matters for appropriate clinical documentation and reimbursement because it reflects disease etiology, severity, and any related complications that impact care.

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    When to Use

    Use a code from this group when documenting a diagnosis of hypoparathyroidism confirmed by clinical assessment and laboratory evidence of low parathyroid hormone or sustained hypocalcemia. Select specific subcodes when the etiology (for example, postsurgical or congenital) or associated complications are known and documented.

    ICD-10-CM Codes

    9 rows

    ICD-10-CM CodeDescription
    E20.0Idiopathic hypoparathyroidism
    E20.1Pseudohypoparathyroidism
    E20.810Autosomal dominant hypocalcemia
    E20.811Secondary hypoparathyroidism in diseases classified elsewhere
    E20.812Autoimmune hypoparathyroidism
    E20.818Other specified hypoparathyroidism due to impaired parathyroid hormone secretion
    E20.819Hypoparathyroidism due to impaired parathyroid hormone secretion, unspecified
    E20.89Other specified hypoparathyroidism
    E20.9Hypoparathyroidism, unspecified

    DRG Codes

    7 rows

    DRG CodeDescription
    640Miscellaneous Disorders of Nutrition, Metabolism, Fluids and Electrolytes with MCC
    641Miscellaneous Disorders of Nutrition, Metabolism, Fluids and Electrolytes without MCC
    643Endocrine Disorders with MCC
    644Endocrine Disorders with CC
    645Endocrine Disorders without CC/MCC
    791Prematurity with Major Problems
    793Full Term Neonate with Major Problems

    Typical Clinical Scenarios

    • A middle-aged patient with a history of total thyroidectomy presents to the endocrine clinic with numbness and muscle cramps; laboratory tests show persistently low serum calcium and inappropriately low parathyroid hormone (PTH) levels several weeks after surgery. This is a chronic postsurgical deficiency of parathyroid function requiring ongoing management and documentation of the underlying hypoparathyroid state. Typical codes: E20.0, E20.9.
    • An adolescent arrives at the emergency department with sudden perioral tingling, tetany, and a generalized seizure; initial labs reveal severe hypocalcemia and an absent or very low PTH consistent with acute hypoparathyroid crisis. This acute presentation necessitates coding for hypoparathyroidism as the primary endocrine cause of life-threatening hypocalcemia. Typical codes: E20.1, E20.9.
    • An adult with known chronic hypoparathyroidism is seen for evaluation of renal complications after long-term calcium and active vitamin D therapy; imaging reveals nephrocalcinosis and reduced renal function attributed to management of the hypoparathyroid state. Coding reflects the underlying hypoparathyroidism as a chronic comorbidity contributing to renal sequelae. Typical codes: E20.89, E20.9.

    Related Codes

    E21-HYPERPARATHYROIDISM-AND-PARATHYROID-DISORDERS

    ICD-10-CM Code For Hyperparathyroidism And Other Disorders Of Parathyroid Gland: Group Overview

    E22-HYPERFUNCTION-OF-PITUITARY-GLAND

    ICD-10-CM Code For Hyperfunction Of Pituitary Gland: Group Overview

    E23-HYPOFUNCTION-OF-PITUITARY-GLAND

    ICD-10-CM Code For Hypofunction And Other Disorders Of The Pituitary Gland: Group Overview

    E24-CUSHINGS-SYNDROME

    ICD-10-CM Code For Cushing's Syndrome: Group Overview

    E25-ADRENOGENITAL-DISORDERS

    ICD-10-CM Code For Adrenogenital Disorders: Group Overview

    E26-HYPERALDOSTERONISM

    ICD-10-CM Code For Hyperaldosteronism: Group Overview

    E27-OTHER-DISORDERS-OF-ADRENAL-GLAND

    ICD-10-CM Code For Other Disorders Of Adrenal Gland: Group Overview

    E28-OVARIAN-DYSFUNCTION

    ICD-10-CM Code For Ovarian Dysfunction: Group Overview

    E29-TESTICULAR-DYSFUNCTION

    ICD-10-CM Code For Testicular Dysfunction: Group Overview

    E31-POLYGLANDULAR-DYSFUNCTION

    ICD-10-CM Code For Polyglandular Dysfunction: Group Overview

    Showing 1–10 of 13

    Frequently Asked Questions

    References

    1. 1.CPT® Codes and Descriptions. AAPC. Retrieved Aug 11, 2026.Maintains the CPT code set's official descriptions and guidelines, licensed from the American Medical Association, used as the definitional source for CPT codes on this page.
    2. 2.HCPCS Quarterly Update. Centers for Medicare & Medicaid Services (CMS). Retrieved Aug 11, 2026.CMS's quarterly release of HCPCS Level II codes and short/long descriptors, the source for HCPCS code definitions and update history.
    3. 3.ICD-10-CM Full Code List. Centers for Medicare & Medicaid Services (CMS). Retrieved Aug 11, 2026.CMS's complete ICD-10-CM diagnosis code list, used to cross-reference diagnosis codes associated with this procedure or service.
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