What does ICD-10 code E71.40 mean?

ICD-10 code E71.40 is the standardized code used for disorder of carnitine metabolism, unspecified in medical records and coding systems.

When is ICD-10 code E71.40 used?

Doctors, hospitals, and insurers may use ICD-10 code E71.40 when recording disorder of carnitine metabolism, unspecified in a standardized format.

Does ICD-10 code E71.40 confirm a diagnosis?

No. A code helps standardize documentation and claims, but it should not be read as a substitute for a clinician's full assessment.

ICD10BillableValid for clinical use

ICD-10 Code E71.40: Disorder of carnitine metabolism, unspecified

Name: ICD-10 Code E71.40: Disorder of carnitine metabolism, unspecified
Creator: HealthAssure Clinical Team
Published: 2026-05-26T12:46:38.762Z

E71.40 is a billable ICD-10 diagnosis code used to classify Disorder of carnitine metabolism, unspecified in medical records and claims. You may see this code in hospital records, discharge summaries, insurance claims, encounter documentation, referrals, or other healthcare billing and coding records. ICD-10 codes are diagnosis classification codes used in healthcare records, reporting, coding workflows, and billing support. This code sits within the broader ICD-10 area for Endocrine, nutritional and metabolic diseases (E00-E89).

Reviewed by HealthAssure Clinical TeamUpdated 26 May 2026

What is this code?

ICD-10 codes are diagnosis classification codes used in healthcare records, reporting, coding workflows, and billing support. This code sits within the broader ICD-10 area for Endocrine, nutritional and metabolic diseases (E00-E89).

When is it used?

May be used when a clinician documents disorder of carnitine metabolism, unspecified in a patient's medical record.
May appear in hospital records, claims, referrals, and clinical documentation.
This code can be used as a clinically usable diagnosis entry in standardized coding workflows.

What it does not mean

A code alone does not explain severity, treatment plan, or outcome.
A medical code should not be treated as a substitute for a doctor's diagnosis or advice.

Code hierarchy

chapter

4Endocrine, nutritional and metabolic diseases (E00-E89)

block

E70-E88Metabolic disorders

Where you may see this code

You may see this code in hospital records, discharge summaries, insurance claims, encounter documentation, referrals, or other healthcare billing and coding records.

Related specialists

EndocrinologistGeneral Physician

Sibling codes

E71.41Primary carnitine deficiencybillable E71.42Carnitine deficiency due to inborn errors of metabolismbillable E71.43Iatrogenic carnitine deficiencybillable E71.44Other secondary carnitine deficiency

Coverage-related procedures and services

CPT 82379high

CARNITINE (TOTAL AND FREE), QUANTITATIVE, EACH SPECIMEN

Source: CMS coverage guidance

Coding guidelines

Common synonyms

Disorder of carnitine metabolism, unspecifiedDisorder of carnitine metabolism

Frequently asked questions

About this content

This page is prepared by HealthAssure's clinical team using official coding standards from ICD-10. AI tools assist with drafting explanations, which are then reviewed and verified by healthcare professionals for accuracy. This content is for informational purposes and does not replace professional medical advice. Meet our team.