2026 ICD-10-CM Diagnosis Code E20.811Secondary hypoparathyroidism in diseases classified elsewhere

ICD-10-CM Codes›E00–E89›E20-E35›E20

ICD-10-CM E20.811
CMSSource: CMS FY 2026 ICD-10-CM dataset · Effective Oct 1, 2025 – Sep 30, 2026

E20.811 is a billable ICD-10-CM diagnosis code for secondary hypoparathyroidism in diseases classified elsewhere. 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. The code is a manifestation code that cannot be reported as the principal diagnosis. Coders also document this condition as hypoparathyroidism due to Wilson disease. In AHRQ's Clinical Classifications Software (CCSR), this diagnosis falls under Other specified and unspecified endocrine disorders.

Code Identity

ICD-10-CM Code
E20.811
Billable Status
Yes — Valid for Submission
Code Describes
Secondary hypoparathyroidism in diseases classified elsewhere
Short Description
Secondary hypoparathyroidism in diseases classd elswhr
Parent Code
E20.81
Hypoparathyroidism due to impaired parathyroid hormone secretion

Code Classification

ChapterE00–E89Endocrine, nutritional and metabolic diseases
SectionE20-E35Disorders of other endocrine glands
CategoryE20Hypoparathyroidism
This CodeE20.811Secondary hypoparathyroidism in diseases classified elsewhere

Code EditsBilling

Medicare Code Editor checks that affect claim validity for E20.811.

Manifestation diagnoses
Manifestation codes describe the manifestation of an underlying disease, not the disease itself, and therefore should not be used as a principal diagnosis.

Approximate SynonymsGuidance

Alternate terms and clinical phrases that map to this code.

  • Hypoparathyroidism due to Wilson disease
  • Secondary hypoparathyroidism

Tabular List NotesGuidance

Coding notes and annotation back-references applicable to this code.

Code First

  • underlying condition, if known

Index to Diseases and InjuriesGuidance

Alphabetical index entries that point to this code.

External Cause of Injuries IndexGuidance

References for this code in the External Cause of Injuries Index.

    • Hypoparathyroidism
      • secondary, in diseases classified elsewhere

Clinical ClassificationClinical

AHRQ’s CCSR groups this code into broader clinical categories.

CCSR END015
Other specified and unspecified endocrine disorders
Default principal diagnosis: inpatient No · outpatient No

Code History & ChangesHistory

Replacement E20.811 replaces the following previously assigned code(s):

  • E20.8 - Other hypoparathyroidism
FY 2024AddedAdded to the ICD-10-CM code setEffective October 1, 2023.
FY 2025No changes
FY 2026CurrentCurrent code set, no changesEffective October 1, 2025 through September 30, 2026.

Questions About E20.811Overview

Is E20.811 a billable code?

Yes. This is a billable ICD-10-CM code, specific enough to report secondary hypoparathyroidism in diseases classified elsewhere on HIPAA-covered claims from October 1, 2025 through September 30, 2026.

What MS-DRG does E20.811 group to?

On inpatient claims, secondary hypoparathyroidism in diseases classified elsewhere maps to MS-DRG 643, 644, 645, with relative weights from 0.7683 to 1.6461 depending on complications. Higher weights mean higher Medicare reimbursement.

Can E20.811 be a principal diagnosis?

No. This is a manifestation code: secondary hypoparathyroidism in diseases classified elsewhere describes the manifestation of an underlying disease rather than the disease itself, so the underlying condition is sequenced first.

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.