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ICD-10 Code E20.812: Autoimmune hypoparathyroidism

E20.812 is a billable ICD-10 diagnosis code used to classify Autoimmune hypoparathyroidism in medical records and claims. You may see this code in hospital records, discharge summaries, insurance claims, encounter documentation, referrals, or other healthcare billing and coding records. ICD-10 codes are diagnosis classification codes used in healthcare records, reporting, coding workflows, and billing support. This code sits within the broader ICD-10 area for Endocrine, nutritional and metabolic diseases (E00-E89).

What is this code?

ICD-10 codes are diagnosis classification codes used in healthcare records, reporting, coding workflows, and billing support. This code sits within the broader ICD-10 area for Endocrine, nutritional and metabolic diseases (E00-E89).

šŸ“‹Clinical overview

This ICD-10 code is commonly used when documentation describes hypoparathyroidism or a related parathyroid-hormone deficiency or resistance disorder. The most accurate code depends on whether the record identifies idiopathic, pseudo-, autoimmune, secondary, secretion-related, other specified, or unspecified hypoparathyroidism.

When is it used?

  • May be used when a clinician documents autoimmune hypoparathyroidism in a patient's medical record.
  • May appear in hospital records, claims, referrals, and clinical documentation.
  • This code can be used as a clinically usable diagnosis entry in standardized coding workflows.

What it does not mean

  • A code alone does not explain severity, treatment plan, or outcome.
  • A medical code should not be treated as a substitute for a doctor's diagnosis or advice.

šŸ©ŗClinical context

When commonly used
  • Endocrinology, primary-care, inpatient, and utilization-review workflows where hypocalcemia or parathyroid-hormone dysfunction is part of the active problem list.
  • Coding workflows where the chart identifies the mechanism of hypoparathyroidism, such as hormone resistance, autoimmune disease, impaired secretion, or another specified endocrine context.
Common management context
  • Evaluation often includes calcium, phosphorus, magnesium, vitamin D, and parathyroid hormone review, symptom assessment for tetany or paresthesias, and endocrine follow-up planning.
  • Documentation usually becomes more specific when the chart identifies idiopathic versus pseudo- versus autoimmune versus secondary hypoparathyroidism, or clarifies impaired secretion versus another specified mechanism.
  • Specialist context already linked on this page includes Endocrinologist, General Physician.

šŸ”Key distinctions

Important notes
  • This ICD-10 family captures hypoparathyroidism and related parathyroid-hormone deficiency or resistance patterns rather than hyperparathyroidism or unrelated calcium-balance disorders.
  • Mechanism detail, such as pseudo-, autoimmune, secondary, secretion-related, or unspecified pattern, drives the final code specificity inside this family.
  • Autoimmune hypoparathyroidism is coded separately from other specified hypoparathyroidism because the underlying immune-mediated mechanism is documented.
  • Documentation that describes hypoparathyroidism is coded differently from hyperparathyroidism, vitamin-D disorders, or other endocrine causes of calcium imbalance.
Related codes to consider
E20.810Autosomal dominant hypocalcemia
Related hypoparathyroidism ICD-10 code; documentation often becomes more specific when the chart identifies idiopathic versus pseudo- versus autoimmune versus secondary pattern, impaired hormone secretion, or another endocrine context.
E20.811Secondary hypoparathyroidism in diseases classified elsewhere
Related hypoparathyroidism ICD-10 code; documentation often becomes more specific when the chart identifies idiopathic versus pseudo- versus autoimmune versus secondary pattern, impaired hormone secretion, or another endocrine context.
E20.818Other specified hypoparathyroidism due to impaired parathyroid hormone secretion
Related hypoparathyroidism ICD-10 code; documentation often becomes more specific when the chart identifies idiopathic versus pseudo- versus autoimmune versus secondary pattern, impaired hormone secretion, or another endocrine context.
E20.819Hypoparathyroidism due to impaired parathyroid hormone secretion, unspecified
Related hypoparathyroidism ICD-10 code; documentation often becomes more specific when the chart identifies idiopathic versus pseudo- versus autoimmune versus secondary pattern, impaired hormone secretion, or another endocrine context.

Code hierarchy

chapter
4Endocrine, nutritional and metabolic diseases (E00-E89)
block
E20-E35Disorders of other endocrine glands
category
E20Hypoparathyroidism
category
E20.8Other hypoparathyroidism
category
E20.81Hypoparathyroidism due to impaired parathyroid hormone secretion
currentE20.81

Official coding notes

Applicable to
  • , if applicable, underlying condition such as:
  • autoimmune polyglandular failure (E31.0)
  • Schmidt's syndrome (E31.0)
Code first
  • , if applicable, underlying condition such as:
  • autoimmune polyglandular failure (E31.0)
  • Schmidt's syndrome (E31.0)

Where you may see this code

You may see this code in hospital records, discharge summaries, insurance claims, encounter documentation, referrals, or other healthcare billing and coding records.

Related specialists

EndocrinologistGeneral Physician

Coding guidelines

Common synonyms

Autoimmune hypoparathyroidism

Frequently asked questions

Code details

CodeE20.812
SystemICD10
Display nameAutoimmune hypoparathyroidism
ChapterEndocrine, nutritional and metabolic diseases (E00-E89)
BlockDisorders of other endocrine glands

Flags

BillableYes
Valid clinical useYes

Source

SourceICD-10
Version2026-annual
Releaseannual
Year2026

Index terms

Matched terms
Hypoparathyroidism

About this content

This page is prepared by HealthAssure's clinical team using official coding standards from ICD-10. AI tools assist with drafting explanations, which are then reviewed and verified by healthcare professionals for accuracy. This content is for informational purposes and does not replace professional medical advice. Meet our team.