ICD-10-CM 2027
ICD-10 code for autoimmune hypoparathyroidism
From the official ICD-10-CM alphabetic index entry “Hypoparathyroidism › autoimmune”. Page updated September 29, 2026.
About coding autoimmune hypoparathyroidism
The ICD-10-CM code for autoimmune hypoparathyroidism is E20.812 (Autoimmune hypoparathyroidism).
Within E20.81 (hypoparathyroidism due to impaired parathyroid hormone secretion), E20.812 is specifically for autoimmune hypoparathyroidism. Related codes cover autosomal dominant hypocalcemia (E20.810), secondary hypoparathyroidism in diseases classified elsewhere (E20.811), other specified hypoparathyroidism due to impaired parathyroid hormone secretion (E20.818) and unspecified (E20.819).
Code first , if applicable, underlying condition such as: autoimmune polyglandular failure (E31.0) and Schmidt's syndrome (E31.0).
It is not a CC or MCC, so as a secondary diagnosis it doesn't change the MS-DRG severity level.
Common questions about autoimmune hypoparathyroidism ICD-10 codes
What is the ICD-10 code for autoimmune hypoparathyroidism?
- E20.812 — Autoimmune hypoparathyroidism.
Is E20.812 billable?
- Yes. E20.812 is a billable/specific ICD-10-CM code valid for FY2027 (October 1, 2026 – September 30, 2027).
Can E20.812 be used as a principal diagnosis?
- Yes. The Medicare Code Editor doesn't restrict E20.812 as a principal diagnosis.
Is E20.812 a CC or MCC?
- No. E20.812 is neither a CC nor an MCC under MS-DRG v44.0.