ICD-10 Guide

Achalasia

ICD-10 Coding for Achalasia(K22.0)

PRIMARY SPECIALTYGastroenterology

COMPLEXITYHigh

LAST UPDATED09/15/2025

Sam Tuffun, PT, DPT

Physical Therapist | Medical Coding & Billing Contributor

Diagnosis Overview

What is Achalasia?

Achalasia is a rare esophageal motility disorder characterized by the inability of the lower esophageal sphincter (LES) to relax properly, leading to dysphagia (difficulty swallowing), regurgitation, and chest pain. Key clinical points include: 1) It primarily affects adults aged 30-60 years. 2) Symptoms often worsen over time, leading to significant weight loss and nutritional deficiencies. 3) Diagnosis is typically confirmed through esophageal manometry and barium swallow studies. 4) The exact etiology remains unclear, but autoimmune and neurodegenerative factors are suspected. 5) Patients may present with halitosis due to stagnant food in the esophagus. Typical use cases for the ICD-10 code K22.0 include outpatient gastroenterology consultations, preoperative assessments for surgical interventions, and management of complications such as esophagitis or aspiration pneumonia due to regurgitation.

Key Clinical Considerations:

Diagnosis of achalasia requires clinical evidence of dysphagia, regurgitation, and chest pain, along with confirmatory tests.
Signs and symptoms include difficulty swallowing solids and liquids, regurgitation of undigested food, and weight loss.
Resolution criteria may involve symptom improvement post-treatment (e.g., pneumatic dilation or surgery).
Imaging findings may include dilated esophagus and incomplete LES relaxation on manometry.

Clinical Information

Clinical Criteria & Documentation Requirements

Documentation must include a detailed history of symptoms, diagnostic test results, and treatment plans.
Compliant documentation: 'Patient diagnosed with achalasia based on manometry results showing elevated resting LES pressure.' Non-compliant: 'Patient has trouble swallowing.'
Template phrases: 'Patient presents with dysphagia and regurgitation consistent with achalasia.'
Medical necessity documentation should justify the need for diagnostic tests and treatments based on clinical findings.

Coding Guidelines

Usage Guidelines & Examples

Use K22.0 when a patient presents with classic symptoms of achalasia confirmed by diagnostic testing.
Do not use this code for patients with esophageal strictures or other motility disorders without confirmation of achalasia.
Correct usage: 'Patient diagnosed with achalasia after manometry.' Incorrect usage: 'Patient has esophageal stricture.'
Common errors include misdiagnosing achalasia when symptoms are due to gastroesophageal reflux disease (GERD).

Code Exclusions

Important Exclusions

Excluded conditions include esophageal strictures and other motility disorders that do not meet achalasia criteria.
Alternative codes for exclusions may include K21.9 for GERD or K22.2 for esophageal obstruction.
Common exclusion errors involve coding achalasia when the primary issue is a different esophageal disorder.
Certain conditions are excluded to ensure accurate diagnosis and treatment pathways are followed.

Specialty Focus

Primary Specialty

Gastroenterology

Specialty Applications

This diagnosis applies to patients with confirmed achalasia presenting with dysphagia and regurgitation.
Appropriate scenarios include preoperative evaluations for surgical interventions like Heller myotomy.
Applicable in both outpatient and inpatient settings, particularly in gastroenterology practices.
Specialty-specific considerations include the need for gastroenterology consultation for management.

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

Template 1

Template: 'Achalasia diagnosed based on esophageal manometry findings.'

Template 2

Template: 'Patient presents with dysphagia and regurgitation consistent with achalasia diagnosis.'

Template 3

Template: 'Diagnostic criteria met: elevated resting LES pressure and incomplete relaxation.'

Template 4

Template: 'Treatment plan includes pneumatic dilation for achalasia management.'

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 documentation is required for this code?

Detailed documentation of symptoms, diagnostic tests, and treatment plans is required.

When should this code be used vs similar codes?

Use K22.0 for confirmed achalasia; use K21.9 for GERD symptoms without achalasia.

What are common billing issues with this code?

Reimbursement issues may arise from insufficient documentation of medical necessity.

What procedures are commonly associated?

CPT codes for related procedures include 43191 for esophageal dilation and 43195 for myotomy.

What is Achalasia?

Key Clinical Considerations:

Diagnosis of achalasia requires clinical evidence of dysphagia, regurgitation, and chest pain, along with confirmatory tests.
Signs and symptoms include difficulty swallowing solids and liquids, regurgitation of undigested food, and weight loss.
Resolution criteria may involve symptom improvement post-treatment (e.g., pneumatic dilation or surgery).
Imaging findings may include dilated esophagus and incomplete LES relaxation on manometry.

Achalasia

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

Template 1

Template 2

Template 3

Template 4

Billing Information

Billing Considerations

Common Issues

Frequently Asked Questions

What documentation is required for this code?

When should this code be used vs similar codes?

What are common billing issues with this code?

What procedures are commonly associated?

Achalasia

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

Template 1

Template 2

Template 3

Template 4

Billing Information

Billing Considerations

Common Issues

Frequently Asked Questions

What documentation is required for this code?

When should this code be used vs similar codes?

What are common billing issues with this code?

What procedures are commonly associated?