K66Header code — not billable

Other disorders of peritoneum

Chapter
11. Diseases of the digestive system
Category
K66
Effective date
October 1, 2026

Related codes in category K66

K66.0Peritoneal adhesions (postprocedural) (postinfection)YesK66.1HemoperitoneumYesK66.8Other specified disorders of peritoneumYesK66.9Disorder of peritoneum, unspecifiedYes

Frequently asked questions

What is ICD-10 code K66?

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

Is K66 a billable code?

No. K66 is a category/header code, not billable on its own — use one of its more specific child codes instead.

What ICD-10-CM chapter is K66 in?

K66 falls under Chapter 11: Diseases of the digestive system.

When did K66 become effective?

K66 has been effective since October 1, 2026, per the CMS/CDC ICD-10-CM annual release.

What other codes are related to K66?

K66 belongs to category K66, which includes 4 other codes — see the related codes list on this page.

ICD-10-CM data maintained by CDC/CMS (public domain). Always verify codes with authoritative sources before making coding or billing decisions.