2026 ICD-10-CM Diagnosis Code E70.81Aromatic L-amino acid decarboxylase deficiency

ICD-10-CM Codes›E00–E89›E70-E88›E70

ICD-10-CM E70.81
CMSSource: CMS FY 2026 ICD-10-CM dataset · Effective Oct 1, 2025 – Sep 30, 2026

E70.81 is a billable ICD-10-CM diagnosis code for aromatic L-amino acid decarboxylase deficiency. It is valid on HIPAA claims for fiscal year 2026 (October 1, 2025 through September 30, 2026). Coders also document this condition as aromatic L-amino acid decarboxylase deficiency disorder. 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
E70.81
Billable Status
Yes — Valid for Submission
Code Describes
Aromatic L-amino acid decarboxylase deficiency
Short Description
Aromatic L-amino acid decarboxylase deficiency
Same as the full description in the CMS dataset.
Parent Code
E70.8
Other disorders of aromatic amino-acid metabolism

Code Classification

ChapterE00–E89Endocrine, nutritional and metabolic diseases
SectionE70-E88Metabolic disorders
CategoryE70Disorders of aromatic amino-acid metabolism
This CodeE70.81Aromatic L-amino acid decarboxylase deficiency

Approximate SynonymsGuidance

Alternate terms and clinical phrases that map to this code.

  • Aromatic L-amino acid decarboxylase deficiency disorder
  • Deficiency of aromatic-L-amino-acid decarboxylase
  • Deficiency of lyase
  • Disorder of catecholamine synthesis

Tabular List NotesGuidance

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

Inclusion Terms

  • AADC deficiency

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.

    • Deficiency, deficient
      • AADC (aromatic L-amino acid decarboxylase)
    • Deficiency, deficient
      • aromatic L-amino acid decarboxylase (AADC)

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

Amino Acid Metabolism Disorders

Metabolism is the process your body uses to make energy from the food you eat. Food is made up of proteins, carbohydrates, and fats. Your digestive system breaks the food parts down into sugars and acids, your body's fuel. Your body can use this fuel right away, or it can store the energy in your body.

Read the full article at MedlinePlus

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

Code History & ChangesHistory

Replacement E70.81 replaces the following previously assigned code(s):

  • E70.8 - Other disorders of aromatic amino-acid metabolism
FY 2021AddedAdded to the ICD-10-CM code setEffective October 1, 2020.
FY 2022–2025No changes
FY 2026CurrentCurrent code set, no changesEffective October 1, 2025 through September 30, 2026.

Questions About E70.81Overview

Is E70.81 (Other disorders of aromatic amino-acid metabolism) a billable code?

Yes. This is a billable ICD-10-CM code, specific enough to report aromatic L-amino acid decarboxylase deficiency on HIPAA-covered claims from October 1, 2025 through September 30, 2026.

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.