K65.9Billable

Peritonitis, unspecified

Chapter
11. Diseases of the digestive system
Category
K65
Effective date
October 1, 2026

Related codes in category K65

K65PeritonitisK65.0Generalized (acute) peritonitisYesK65.1Peritoneal abscessYesK65.2Spontaneous bacterial peritonitisYesK65.3CholeperitonitisYesK65.4Sclerosing mesenteritisYesK65.8Other peritonitisYes

Frequently asked questions

What is ICD-10 code K65.9?

K65.9 is an ICD-10-CM diagnosis code for Peritonitis, unspecified.

Is K65.9 a billable code?

Yes. K65.9 is billable and specific enough to be used on a claim.

What ICD-10-CM chapter is K65.9 in?

K65.9 falls under Chapter 11: Diseases of the digestive system.

When did K65.9 become effective?

K65.9 has been effective since October 1, 2026, per the CMS/CDC ICD-10-CM annual release.

What other codes are related to K65.9?

K65.9 belongs to category K65, which includes 7 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.