E20.812

Billable code

Autoimmune hypoparathyroidism

The ICD-10 code for autoimmune hypoparathyroidism is E20.812.

Clinical notes

Code first

This code represents a manifestation of an underlying disease. Coding convention requires the underlying (etiology) code to be sequenced first, with this code listed second.

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

Documentation support

General coding-documentation guidance — not a substitute for payer-specific requirements or professional coding judgment.

•This code represents a manifestation. Documentation should identify the underlying condition, which must be coded first.
•As a general rule, code to the highest level of specificity supported by the documentation in the medical record.

Related codes in this category

Associated MS-DRGs

E20.812 can serve as the principal diagnosis for these Medicare Severity Diagnosis-Related Groups.

Informational only — actual DRG assignment also depends on procedures, complications/comorbidities (CC/MCC), discharge status, and payer-specific rules not reflected here.