Hypoparathyroidism (E20) ICD-10-CM
The E20 code range covers hypoparathyroidism with 12 ICD-10-CM diagnosis codes. 9 of them are billable and valid for claim submission in fiscal year 2026, and the category headers group them but cannot themselves be billed.
Type 1 Excludes
A type 1 excludes note is a pure excludes note. It means "NOT CODED HERE!" An Excludes1 note indicates that the code excluded should never be used at the same time as the code above the Excludes1 note. An Excludes1 is used when two conditions cannot occur together, such as a congenital form versus an acquired form of the same condition.
Codes in the E20 Range 12 codes · 9 billable
- E20 HypoparathyroidismNon-billable
- E20.0 Idiopathic hypoparathyroidism
- E20.1 Pseudohypoparathyroidism
- E20.8 Other hypoparathyroidismNon-billable
- E20.81 Hypoparathyroidism due to impaired parathyroid hormone secretionNon-billable
- E20.810 Autosomal dominant hypocalcemia
- E20.811 Secondary hypoparathyroidism in diseases classified elsewhere
- E20.812 Autoimmune hypoparathyroidism
- E20.818 Other specified hypoparathyroidism due to impaired parathyroid hormone secretion
- E20.819 Hypoparathyroidism due to impaired parathyroid hormone secretion, unspecified
- E20.89 Other specified hypoparathyroidism
- E20.9 Hypoparathyroidism, unspecified
Clinical Terms in This Code Range
Definitions from the National Library of Medicine for conditions coded in the E20 range.
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.
Pseudohypoparathyroidism
A hereditary syndrome clinically similar to HYPOPARATHYROIDISM. It is characterized by HYPOCALCEMIA; HYPERPHOSPHATEMIA; and associated skeletal development impairment and caused by failure of response to PARATHYROID HORMONE rather than deficiencies. A severe form with resistance to multiple hormones is referred to as Type 1a and is associated with maternal mutant allele of the ALPHA CHAIN OF STIMULATORY G PROTEIN.
Pseudopseudohypoparathyroidism
A form of PSEUDOHYPOPARATHYROIDISM characterized by the same features except for the abnormal response to hormones such as PARATHYROID HORMONE. It is associated with paternally inherited mutant alleles of the ALPHA CHAIN OF STIMULATORY G PROTEIN.
Tetany
A disorder characterized by muscle twitches, cramps, and carpopedal spasm, and when severe, laryngospasm and seizures. This condition is associated with unstable depolarization of axonal membranes, primarily in the peripheral nervous system. Tetany usually results from HYPOCALCEMIA or reduced serum levels of MAGNESIUM that may be associated with HYPERVENTILATION; HYPOPARATHYROIDISM; RICKETS; UREMIA; or other conditions. (From Adams et al., Principles of Neurology, 6th ed, p1490)
About the E20 Code Range
Hypoparathyroidism is coded under E20 in ICD-10 and covers conditions where the parathyroid glands produce insufficient hormone, leading to low calcium levels. These codes specifically identify the type and cause of hypoparathyroidism for accurate clinical documentation and treatment planning.
The main ICD-10 codes include E20.0 for idiopathic hypoparathyroidism, which might present as cataracts due to this unexplained cause. E20.1 refers to pseudohypoparathyroidism and its subtypes, often linked with resistance to parathyroid hormone, with synonyms like pseudopseudohypoparathyroidism clarifying differential diagnoses. Other codes, such as E20.81 and its subcategories, specify hypoparathyroidism due to impaired parathyroid hormone secretion, including inherited forms like autosomal dominant hypocalcemia (E20.810) and autoimmune causes (E20.812). Codes like E20.89 and E20.9 account for other specified or unspecified hypoparathyroidism, covering conditions such as neonatal or transient types and related systemic complications like tetany or cataracts. Using the precise ICD-10 code for hypoparathyroidism ensures clear communication between healthcare providers and accurate patient record-keeping for these varied endocrine disorders.
Questions About This Page
How many billable codes are in the E20 range?
Of the 12 codes in this range, 9 are billable and valid for claim submission from October 1, 2025 through September 30, 2026. Category header codes group them but cannot be reported on claims.
What does the E20 range classify?
The range classifies hypoparathyroidism. Each code links to its own reference page with billing status, MS-DRG grouping, coding notes, and clinical information.
Related References
Source: CMS FY 2026 ICD-10-CM Tabular List and order file, effective October 1, 2025 through September 30, 2026.
