What is the ICD-10 code for Other disorders of peritoneum?

The ICD-10-CM code for Other disorders of peritoneum is K66 (fiscal year 2026). K66 is a non-billable category code — a more specific code such as K66.0 is required for claims.

What does ICD-10 code K66 mean?

K66 is the ICD-10-CM diagnosis code for Other disorders of peritoneum. Other disorders of peritoneum

Is K66 a billable ICD-10 code?

No, K66 is not a billable code. You may need to select a more specific code from this category.

What chapter is K66 in?

K66 is classified under Chapter 11: Diseases of the digestive system (K00-K95), Section K65-K68: Diseases of peritoneum and retroperitoneum (K65-K68).

What are the includes and excludes for K66?

Excludes2 (not included here): ascites (R18.-); peritoneal effusion (chronic) (R18.8).

What more specific codes exist under K66?

More specific codes under K66 include: K66.0, K66.1, K66.8, K66.9. Select the most specific code that matches the clinical documentation.

K66 Other disorders of peritoneum

⚠ Non-Billable ICD-10-CM 2026

Create your free account → Open K66 in the app →

Get what a quick lookup can't: the AI assistant for official-guideline questions, HCC risk-adjustment mappings (CMS-HCC V24/V28, RxHCC), FDA drug indications, and AHA Coding Clinic references for K66.

The ICD-10-CM code for Other disorders of peritoneum is K66 (FY2026). It is a non-billable category code — select a more specific code below for claims.

Classification

Chapter: 11: Diseases of the digestive system (K00-K95)
Section: K65-K68: Diseases of peritoneum and retroperitoneum (K65-K68)
Category K66: 5 codes (4 billable)
FY2026 Status: Stable since FY2024

Excludes2

Not included here. These conditions are coded elsewhere but may be coded together if applicable.

ascites (R18.-)
peritoneal effusion (chronic) (R18.8)

Official Coding Guidelines

Chapter 11 reserved for future expansion

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

— ICD-10-CM Official Guidelines for Coding and Reporting, FY2026, Section I.C.11

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

References

Cite This Page

Reference K66 with the canonical source and edition:

K66 — Other disorders of peritoneum. ICD-10 Coding Pro (ICD-10-CM FY2026). https://icd10codingpro.com/codes/K66

Canonical URL: https://icd10codingpro.com/codes/K66

K66 Other disorders of peritoneum

Classification

Official Coding Guidelines

References

Cite This Page

Related Codes

More Specific Codes

All Codes in K66

Get HCC Mappings, Clinical Summaries, and More