ICD-10 Guide

Lethargy

ICD-10 Coding for Lethargy(R53.83)

PRIMARY SPECIALTYInternal Medicine

COMPLEXITYHigh

LAST UPDATED09/15/2025

Sam Tuffun, PT, DPT

Physical Therapist | Medical Coding & Billing Contributor

Diagnosis Overview

What is Lethargy?

Essential facts and insights about Lethargy

Key Clinical Considerations:

Persistent fatigue lasting more than 6 months
Associated symptoms such as sleep disturbances, cognitive impairment, and mood changes
Exclusion of other medical conditions

Clinical Information

Clinical Criteria & Documentation Requirements

Patient history including onset, duration, and severity of lethargy
Review of systems to identify associated symptoms
Assessment of functional status and impact on daily activities

Coding Guidelines

Usage Guidelines & Examples

Follow ICD-10 guidelines for specificity in coding lethargy.
Common errors include using non-specific codes or failing to document associated symptoms.

Code Exclusions

Important Exclusions

Excludes conditions such as chronic fatigue syndrome and depression
Alternative codes may include those for specific underlying conditions contributing to lethargy

Specialty Focus

Primary Specialty

Internal Medicine

Specialty Applications

Adult patients presenting with unexplained fatigue
Internal medicine clinics and primary care settings

Coding Complexity

High Complexity

This diagnosis requires careful attention to:

Comprehensive clinical documentation
Accurate code selection based on clinical criteria
Proper exclusion considerations
Specialty-specific coding guidelines

Documentation

Documentation Templates

Billing Information

Billing Considerations

Ensure proper documentation for billing
Verify code specificity requirements
Check for any additional codes needed
Review payer-specific guidelines

Common Issues

Insufficient clinical documentation
Incorrect code selection
Missing supporting diagnoses
Timing and frequency documentation

Frequently Asked Questions

What are the documentation requirements?

Document the duration, severity, and impact on daily life.

What are the billing considerations?

Ensure accurate coding to reflect the complexity of the patient's condition.

Lethargy

Diagnosis Overview

Key Clinical Considerations:

Clinical Information

Clinical Criteria & Documentation Requirements

Coding Guidelines

Usage Guidelines & Examples

Code Exclusions

Important Exclusions

Related ICD-10 Codes

Related CPT Codes

Specialty Focus

Primary Specialty

Specialty Applications

Coding Complexity

Documentation

Documentation Templates

Billing Information

Billing Considerations

Common Issues

Frequently Asked Questions

What are the documentation requirements?

What are the billing considerations?

Lethargy

Diagnosis Overview

Key Clinical Considerations:

Clinical Information

Clinical Criteria & Documentation Requirements

Coding Guidelines

Usage Guidelines & Examples

Code Exclusions

Important Exclusions

Related ICD-10 Codes

Related CPT Codes

Specialty Focus

Primary Specialty

Specialty Applications

Coding Complexity

Documentation

Documentation Templates

Billing Information

Billing Considerations

Common Issues

Frequently Asked Questions

What are the documentation requirements?

What are the billing considerations?