K22.0 Achalasia of cardia

The ICD-10-CM code for Achalasia of cardia is K22.0 (FY2026). It is a billable, claim-ready diagnosis code.

Classification

Chapter

11: Diseases of the digestive system (K00-K95)

Section

K20-K31: Diseases of esophagus, stomach and duodenum (K20-K31)

Category K22

21 codes (16 billable)

FY2026 Status

Stable since FY2024

Also Known As

ICD-10-CM Alphabetic Index entries that lead to K22.0:

• Megaloesophagus (functional)
• Megaesophagus (functional)
• Aperistalsis, esophagus
• Achalasia (cardia) (esophagus)
• Cardiospasm (esophagus) (reflex) (stomach)
• Spasm (s), spastic, spasticity › cardia
• Incompetency, incompetent, incompetence › esophagogastric (junction) (sphincter)
• Dilatation › esophagus › due to achalasia

Inclusion Terms

• Achalasia NOS
• Cardiospasm

U.S. Hospital Utilization

• An estimated 20,925 U.S. inpatient stays in 2023 included K22.0 among the documented diagnoses.
• 5,065 stays listed it as the principal diagnosis.

Source: National Inpatient Sample (NIS), Healthcare Cost and Utilization Project (HCUP), Agency for Healthcare Research and Quality, 2016–2023. National survey-weighted estimates.

Official Coding Guidelines

Chapter 11 reserved for future expansion

11. Chapter 11: Diseases of the Digestive System (K00-K95) Reserved for future guideline expansion

Source: CMS — ICD-10-CM Official Guidelines for Coding and Reporting, FY2026

References

• CMS — ICD-10-CM Official Code Set and Guidelines, FY2026
• CDC/NCHS — ICD-10-CM Files and Browser Tool
• AHRQ — HCUP National Inpatient Sample, Frequencies by Diagnosis Code (2016–2023)