2026 ICD-10-CM Diagnosis Code E20.812Autoimmune hypoparathyroidism
ICD-10-CM Codes›E00–E89›E20-E35›E20
- Billable — Valid for Submission
- Chronic Condition
E20.812 is a billable ICD-10-CM diagnosis code for autoimmune hypoparathyroidism. It is valid on HIPAA claims for fiscal year 2026 (October 1, 2025 through September 30, 2026) and groups to MS-DRG 643 through 645. In AHRQ's Clinical Classifications Software (CCSR), this diagnosis falls under Other specified and unspecified endocrine disorders.
Code Identity
Code Classification
Approximate SynonymsGuidance
Alternate terms and clinical phrases that map to this code.
- Autoimmune hypoparathyroidism
Tabular List NotesGuidance
Coding notes and annotation back-references applicable to this code.
Code First
- , if applicable, underlying condition such as:
- autoimmune polyglandular failure E31.0
- Schmidt's syndrome E31.0
Certain conditions have both an underlying etiology and multiple body system manifestations due to the underlying etiology. For such conditions, the ICD-10-CM has a coding convention that requires the underlying condition be sequenced first followed by the manifestation. Wherever such a combination exists, there is a "use additional code" note at the etiology code, and a "code first" note at the manifestation code. These instructional notes indicate the proper sequencing order of the codes, etiology followed by manifestation.
Index to Diseases and InjuriesGuidance
Alphabetical index entries that point to this code.
- autoimmune - E20.812
External Cause of Injuries IndexGuidance
References for this code in the External Cause of Injuries Index.
- Hypoparathyroidism
- autoimmune
Clinical ClassificationClinical
AHRQ’s CCSR groups this code into broader clinical categories.
Code History & ChangesHistory
Replacement E20.812 replaces the following previously assigned code(s):
- E20.8 - Other hypoparathyroidism
Questions About E20.812Overview
Is E20.812 a billable code?
Yes. This is a billable ICD-10-CM code, specific enough to report autoimmune hypoparathyroidism on HIPAA-covered claims from October 1, 2025 through September 30, 2026.
What MS-DRG does E20.812 group to?
When autoimmune hypoparathyroidism is the principal diagnosis on an inpatient stay, it groups to MS-DRG 643, 644, 645, with relative weights from 0.7683 to 1.6461 depending on complications. Higher weights mean higher Medicare reimbursement.
Footnotes
[1] Chronic - a chronic condition code indicates a condition lasting 12 months or longer and its effect on the patient based on one or both of the following criteria:
- The condition results in the need for ongoing intervention with medical products,treatment, services, and special equipment
- The condition places limitations on self-care, independent living, and social interactions.
