2026 ICD-10-CM Diagnosis Code E20Hypoparathyroidism

ICD-10-CM Codes›E00–E89›E20-E35›E20

ICD-10-CM E20
CMSSource: CMS FY 2026 ICD-10-CM dataset · Effective Oct 1, 2025 – Sep 30, 2026

E20 is a non-billable ICD-10-CM category code for hypoparathyroidism, so it cannot be submitted on claims. Use a more specific code from this category instead, such as E20.0, E20.1, E20.810, and E20.811.

Code Identity

ICD-10-CM Code
E20
Billable Status
No — Non-Billable Category
Code Describes
Hypoparathyroidism
Chapter
E20-E35
Disorders of other endocrine glands

Code Classification

ChapterE00–E89Endocrine, nutritional and metabolic diseases
SectionE20-E35Disorders of other endocrine glands
CategoryE20Hypoparathyroidism
This CodeE20Hypoparathyroidism

Specific Coding for HypoparathyroidismOverview

Non-specific codes like E20 require more characters. Use one of these billable codes instead:

  • Use E20.0 for Idiopathic hypoparathyroidism

  • Use E20.1 for Pseudohypoparathyroidism

  • E20.8 for Other hypoparathyroidism

  • E20.81 for Hypoparathyroidism due to impaired parathyroid hormone secretion

  • Use E20.89 for Other specified hypoparathyroidism

  • Use E20.9 for Hypoparathyroidism, unspecified

Tabular List NotesGuidance

Coding notes and annotation back-references applicable to this code.

Type 1 Excludes

  • Di George's syndrome D82.1
  • postprocedural hypoparathyroidism E89.2
  • tetany NOS R29.0
  • transitory neonatal hypoparathyroidism P71.4

Clinical InformationClinical

  • Hypoparathyroidism

    a condition caused by a deficiency of parathyroid hormone (or pth). it is characterized by hypocalcemia and hyperphosphatemia. hypocalcemia leads to tetany. the acquired form is due to removal or injuries to the parathyroid glands. the congenital form is due to mutations of genes, such as tbx1; (see digeorge syndrome); casr encoding calcium-sensing receptor; or pth encoding parathyroid hormone.

  • Acquired Hypoparathyroidism

    hypoparathyroidism, the cause of which is not present at birth.

  • Albright Hereditary Osteodystrophy with Multiple Hormone Resistance|PHP1a|Pseudohypoparathyroidism Type 1a

    parathyroid hormone (pth) resistance caused by heterozygous inactivating mutation(s) of the maternal allele of the gnas gene encoding gs-alpha, resulting in expression of pth from only the paternal allele. clinical manifestations include albright hereditary osteodystrophy, early-onset obesity, and, in some cases, resistance to thyroid-stimulating hormone, gonadotropins, and growth hormone-releasing hormone, reflecting additional manifestations of gs-alpha deficiency.

  • Albright Hereditary Osteodystrophy without Multiple Hormone Resistance|Albright Hereditary Osteodystrophy with Multiple Hormone Resistance|PPHP|Pseudopseudohypoparathyroidism

    a condition caused by inactivating mutation(s) in the paternal allele of the gnas gene, encoding gs-alpha, resulting in expression of the gs-alpha protein from only the maternal allele. affected individuals have the clinical phenotype of albright hereditary osteodystrophy without hormone resistance.

  • Albright's Hereditary Osteodystrophy|Albright Hereditary Osteodystrophy|Albright's Hereditary Osteodystrophy with Multiple Hormone Resistance|PHP1A|Pseudohypoparathyroidism, Type IA

    a rare, autosomal dominant syndrome caused by mutations in the gnas gene. it is characterized by the presence of short stature, obesity, round face, brachydactyly, subcutaneous ossifications, and pseudohypoparathtyroidism.

  • Autosomal Dominant Hypoparathyroidism

    hypoparathyroidism associated with heterozygous mutation(s) in the pth gene, which encodes parathyroid hormone, or in the gcm2 gene, which encodes chorion-specific transcription factor gcmb.

  • Autosomal Recessive Hypoparathyroidism

    hypoparathyroidism associated with homozygous mutation(s) in the pth gene, which encodes parathyroid hormone, or in the gcm2 gene, which encodes chorion-specific transcription factor gcmb.

  • Barakat Syndrome|Hypoparathyroidism, Deafness, and Renal Anomalies Syndrome

    a condition characterized by hypoparathyroidism, sensorineural deafness, and renal failure. it is related to autosomal dominant inactivating mutation(s) in gata3, encoding a transcription factor important for the embryonic development of the parathyroid gland, the auditory stem, and the kidneys.

  • Grade 1 Hypoparathyroidism, CTCAE|Grade 1 Hypoparathyroidism

    asymptomatic; clinical or diagnostic observations only; intervention not indicated

  • Grade 2 Hypoparathyroidism, CTCAE|Grade 2 Hypoparathyroidism

    moderate symptoms; medical intervention indicated

  • Grade 3 Hypoparathyroidism, CTCAE|Grade 3 Hypoparathyroidism

    severe symptoms; medical intervention or hospitalization indicated

  • Grade 4 Hypoparathyroidism, CTCAE|Grade 4 Hypoparathyroidism

    life-threatening consequences; urgent intervention indicated

  • Grade 5 Hypoparathyroidism, CTCAE|Grade 5 Hypoparathyroidism

    death

  • Hypoparathyroidism

    an endocrine disorder characterized by decreased production of parathyroid hormone by the parathyroid glands. it is usually caused by damage of the parathyroid glands during head and neck surgery. signs and symptoms include muscle cramps, abdominal pain, dry skin, brittle nails, cataracts, tetany, and convulsions.

  • Hypoparathyroidism, CTCAE|Hypoparathyroidism|Hypoparathyroidism

    a disorder characterized by a decrease in production of parathyroid hormone by the parathyroid glands.

  • Hypoparathyroidism-Retardation-Dysmorphism Syndrome|HRDS|Hypoparathyroidism with Short Stature, Mental Retardation, and Seizures|Hypoparathyroidism, Congenital, Associated with Dysmorphism, Growth Retardation, and Developmental Delay|Sanjad-Sakati Syndrome

    an autosomal recessive condition caused by mutation(s) in the tbce gene, encoding tubulin-specific chaperone e. it is characterized by congenital hypoparathyroidism, mental retardation, seizures and developmental delay.

  • Iatrogenic Hypoparathyroidism

    hypoparathyroidism resulting from medical treatment or intervention.

  • Parathyroid Hormone Resistance|Pseudohypoparathyroidism|Pseudoparathyroidism

    a finding indicating decreased tissue sensitivity to parathyroid hormone.

  • Primary Hypoparathyroidism

    abnormally low levels of parathyroid hormone due to a disorder originating within the parathyroid glands.

  • Pseudohypoparathyroidism

    a condition characterized by the insensitivity of the tissues to respond to the activity of the parathyroid hormone. it results in increased levels of parathyroid hormone in the serum, hypocalcemia, and hyperphosphatemia.

  • Renal Parathyroid Hormone Resistance|Pseudohypoparathyroidism Type 1b

    parathyroid hormone resistance caused by defects in methylation in the gnas gene that cause loss of expression of gs-alpha from the maternal allele in renal tissue, resulting in decreased phosphate excretion and increased calcium excretion. individuals with this condition may also have brachydactyly and partial resistance to thyroid-stimulating hormone.

  • Secondary Parathyroid Hormone Resistance|Acquired Parathyroid Hormone Resistance|Acquired Parathyroid Hormone Resistance|Pseudohypoparathyroidism, Type 2|Pseudohypoparathyroidism, Type 2

    parathyroid hormone (pth) resistance caused by vitamin d deficiency and characterized by clinically increased pth concentrations with relative hyperphosphatemia. the diagnosis can be confirmed by finding of a normal cyclic adenosine monophosphate (camp) response to pth infusion, but deficient phosphaturic response, indicating a defect distal to camp generation in renal cells.

  • TBCE wt Allele|HRD|Hypoparathyroidism, Growth and Mental Retardation, and Dysmorphism Gene|KCS|KCS1|Kenny-Caffey Syndrome Gene|PEAMO|Tubulin Folding Cofactor E wt Allele|pac2

    human tbce wild-type allele is located in the vicinity of 1q42.3 and is approximately 85 kb in length. this allele, which encodes tubulin-specific chaperone e protein, is involved in both tubulin folding and tubulin dimer dissociation. mutations in the gene are associated with progressive encephalopathy with amyotrophy and optic atrophy, hypoparathyroidism-retardation-dysmorphism syndrome and kenny-caffey syndrome 1.

  • Transient Neonatal Hypoparathyroidism

    a disorder of decreased production of parathyroid hormone by the parathyroid gland in a newborn. it is due to maternal hyperparathyroidism. it may be characterized by hypocalcemic seizures in the first weeks of life.

  • X-Linked Hypoparathyroidism|X-linked Hypoparathyroidism

    hypoparathyroidism in which the inheritance is recessive and linked to the q26-q27 region of the x chromosome. the parathyroid glands are usually incompletely developed (parathyroid dysgenesis) or absent (parathyroid agenesis).

Patient EducationClinical

Parathyroid Disorders

Most people have four pea-sized glands, called parathyroid glands, on the thyroid gland in the neck. Though their names are similar, the thyroid and parathyroid glands are completely different. The parathyroid glands make parathyroid hormone (PTH), which helps your body keep the right balance of calcium and phosphorous.

Read the full article at MedlinePlus

Courtesy of MedlinePlus, a service of the U.S. National Library of Medicine.

Code HistoryHistory

FY 2016AddedAdded to the ICD-10-CM code setEffective October 1, 2015, the first year of ICD-10-CM.
FY 2017–2025No changes
FY 2026CurrentCurrent code set, no changesEffective October 1, 2025 through September 30, 2026.

Questions About E20Overview

Is E20 (Hypoparathyroidism) a billable code?

No. This is a category header that groups the codes for hypoparathyroidism, and headers cannot be submitted on claims. Claims for hypoparathyroidism need a more specific code from this category, such as E20.0, E20.1, and E20.810.