2025 ICD-10-CM Diagnosis Code E20.0

Approximate Synonyms

The following list of clinical terms are approximate synonyms, alternative descriptions, or common phrases that might be used by patients, healthcare providers, or medical coders to describe the same condition. These synonyms and related diagnosis terms are often used when searching for an ICD-10 code, especially when the exact medical terminology is unclear. Whether you're looking for lay terms, similar diagnosis names, or common language alternatives, this list can help guide you to the correct ICD-10 classification.

Clinical Classification

Clinical Classifications group individual ICD-10-CM diagnosis codes into broader, clinically meaningful categories. These categories help simplify complex data by organizing related conditions under common clinical themes.

They are especially useful for data analysis, reporting, and clinical decision-making. Even when diagnosis codes differ, similar conditions can be grouped together based on their clinical relevance. Each category is assigned a unique CCSR code that represents a specific clinical concept, often tied to a body system or medical specialty.

Clinical Information

• 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).

MS-DRG Mapping for ICD-10-CM Code E20.0

Diagnosis-Related Groups (DRGs) are used to classify hospital cases for billing and healthcare management. They help standardize how hospitals and other providers are reimbursed for inpatient care. Patients are grouped based on their principal diagnosis into broader categories called Major Diagnostic Categories (MDCs).

Once assigned to a DRG, the hospital receives a set payment for the patient’s care, regardless of the actual services provided. This fixed rate is intended to cover the typical cost of treating patients within that group. The payment amount depends on the DRG's relative weight, which reflects the expected complexity and cost of care based on the severity of the patient’s condition.

Diagnostic related groups encourage healthcare providers to focus on quality and efficiency in patient care while managing costs effectively. The diagnosis code is present in the following groups for version MS-DRG V42.0 applicable from 10/01/2024 through 09/30/2025.

Convert E20.0 to ICD-9-CM

Below are the ICD-9 codes that most closely match this ICD-10 code, based on the General Equivalence Mappings (GEMs). This ICD-10 to ICD-9 crosswalk tool is helpful for coders who need to reference legacy diagnosis codes for audits, historical claims, or approximate code comparisons.

Patient Education

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.

If your parathyroid glands make too much or too little hormone, it disrupts this balance. If they secrete extra PTH, you have hyperparathyroidism, and your blood calcium rises. In many cases, a benign tumor on a parathyroid gland makes it overactive. Or, the extra hormones can come from enlarged parathyroid glands. Very rarely, the cause is cancer.

If you do not have enough PTH, you have hypoparathyroidism. Your blood will have too little calcium and too much phosphorous. Causes include injury to the glands, endocrine disorders, or genetic conditions. Treatment is aimed at restoring the balance of calcium and phosphorous.

NIH: National Institute of Diabetes and Digestive and Kidney Diseases

[Learn More in MedlinePlus]

Code History

• FY 2024 - No Change, effective from 10/1/2023 through 9/30/2024
• FY 2023 - No Change, effective from 10/1/2022 through 9/30/2023
• FY 2022 - No Change, effective from 10/1/2021 through 9/30/2022
• FY 2021 - No Change, effective from 10/1/2020 through 9/30/2021
• FY 2020 - No Change, effective from 10/1/2019 through 9/30/2020
• FY 2019 - No Change, effective from 10/1/2018 through 9/30/2019
• FY 2018 - No Change, effective from 10/1/2017 through 9/30/2018
• FY 2017 - No Change, effective from 10/1/2016 through 9/30/2017
• FY 2016 - New Code, effective from 10/1/2015 through 9/30/2016. This was the first year ICD-10-CM was implemented into the HIPAA code set.