K38.8 Other specified diseases of appendix

The ICD-10-CM code for Other specified diseases of appendix is K38.8 (FY2026). It is a billable, claim-ready diagnosis code.

Classification

Chapter

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

Section

K35-K38: Diseases of appendix (K35-K38)

Category K38

7 codes (6 billable)

FY2026 Status

Stable since FY2024

Also Known As

ICD-10-CM Alphabetic Index entries that lead to K38.8:

• Obliteration › appendix (lumen)
• Adhesions, adhesive (postinfective) › appendix
• Colic (bilious) (infantile) (intestinal) (recurrent) (spasmodic) › appendix, appendicular
• Sloughing (multiple) (phagedena) (skin) › appendix
• Mucocele › appendix
• Intussusception (bowel) (colon) (enteric) (ileocecal) (ileocolic) (intestine) ( rectum) › appendix
• Cyst (colloid) (mucous) (simple) (retention) › appendix
• Atrophy, atrophic (of) › appendix

Inclusion Terms

• Intussusception of appendix

U.S. Hospital Utilization

• An estimated 3,530 U.S. inpatient stays in 2023 included K38.8 among the documented diagnoses.
• 790 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)