2026 ICD-10-CM Diagnosis Code E80.3Defects of catalase and peroxidase

ICD-10-CM Codes›E00–E89›E70-E88›E80

ICD-10-CM E80.3
CMSSource: CMS FY 2026 ICD-10-CM dataset · Effective Oct 1, 2025 – Sep 30, 2026

E80.3 is a billable ICD-10-CM diagnosis code for defects of catalase and peroxidase. It is valid on HIPAA claims for fiscal year 2026 (October 1, 2025 through September 30, 2026). Coders also document this condition as acatalasemia. In AHRQ's Clinical Classifications Software (CCSR), this diagnosis falls under Other specified and unspecified nutritional and metabolic disorders.

Code Identity

ICD-10-CM Code
E80.3
Billable Status
Yes — Valid for Submission
Code Describes
Defects of catalase and peroxidase
Short Description
Defects of catalase and peroxidase
Same as the full description in the CMS dataset.
Parent Code
E80
Disorders of porphyrin and bilirubin metabolism

Code Classification

ChapterE00–E89Endocrine, nutritional and metabolic diseases
SectionE70-E88Metabolic disorders
CategoryE80Disorders of porphyrin and bilirubin metabolism
This CodeE80.3Defects of catalase and peroxidase

Approximate SynonymsGuidance

Alternate terms and clinical phrases that map to this code.

  • Acatalasemia
  • Congenital hypothyroidism due to thyroid peroxidase mutation
  • Deficiency of catalase
  • Deficiency of cytochrome-c peroxidase
  • Deficiency of iodide peroxidase
  • Iodide peroxidase defect

Tabular List NotesGuidance

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

Inclusion Terms

  • Acatalasia Takahara

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.

    • Acatalasemia, acatalasia
    • Defect, defective
      • catalase
    • Defect, defective
      • enzyme
        • catalase
    • Defect, defective
      • enzyme
        • peroxidase
    • Defect, defective
      • peroxidase
    • Takahara's disease

Clinical ClassificationClinical

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

CCSR END016
Other specified and unspecified nutritional and metabolic disorders
Default principal diagnosis: inpatient Yes · outpatient Yes

Patient EducationClinical

Metabolic Disorders

Metabolism is the process your body uses to get or make energy from the food you eat. Food is made up of proteins, carbohydrates, and fats. Chemicals in your digestive system break the food parts down into sugars and acids, your body's fuel.

Read the full article at MedlinePlus

Courtesy of MedlinePlus, a service of the U.S. National Library of Medicine.

Convert E80.3 to ICD-9-CMHistory

The closest ICD-9-CM equivalents under the General Equivalence Mappings.

ICD-9-CM
277.89 Metabolism disorder NEC
Approximate The match is approximate rather than exact.

Code HistoryHistory

FY 2016AddedAdded to the ICD-10-CM code setEffective October 1, 2015, the first year of ICD-10-CM.
FY 2017–2025No changes
FY 2026CurrentCurrent code set, no changesEffective October 1, 2025 through September 30, 2026.

Questions About E80.3Overview

Is E80.3 (Disorders of porphyrin and bilirubin metabolism) a billable code?

Yes. This is a billable ICD-10-CM code, specific enough to report defects of catalase and peroxidase on HIPAA-covered claims from October 1, 2025 through September 30, 2026.

What is the ICD-9 equivalent of E80.3?

Under the General Equivalence Mappings, defects of catalase and peroxidase converts to ICD-9-CM 277.89 (metabolism disorder NEC). The mapping is approximate, so confirm the match fits the documentation.

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.