K66 ICD-10-CM Code: Other disorders of peritoneum
A clear reference for the official code description, hierarchy, and related coding information from the FY 2027 U.S. release.
Official description
K66Other disorders of peritoneum
ICD-10-CM diagnosis code · United States clinical modification
Where K66 sits
- 1
Chapter 11
Diseases of the digestive system (K00-K95)
- 2
Section
Diseases of peritoneum, retroperitoneum and pelvis (K65-K6A)
- 3
Category K66
Other disorders of peritoneum
- 4
Code K66
Other disorders of peritoneum
Codes under K66
K66 is a non-billable category. Choose the child code that best matches the documented diagnosis.
Notes for this code
Inclusion terms
No inclusion terms are listed for K66.
Code first
No “code first” instruction is listed for K66.
Use additional code
No “use additional code” instruction is listed for K66.
Excludes1
Conditions that should not be reported together with this code.
No Excludes1 note is listed for K66.
Excludes2
Conditions not included here that may be reported separately when present.
- ascites (R18.-)
- peritoneal effusion (chronic) (R18.8)
Source and release
- Data release
- U.S. ICD-10-CM · FY 2027
- Effective date
- Oct 1, 2026
- Publisher
- Vero Scribe Inc.
This reference is generated from Vero’s ICD-10-CM description, hierarchy, and code-note dataset. The visible content and structured data share that source.
Frequently asked questions
What does ICD-10-CM code K66 mean?
K66 is the FY 2027 U.S. ICD-10-CM code for “Other disorders of peritoneum.”
Is K66 a billable or specific ICD-10-CM code?
No. K66 has more specific child codes in the FY 2027 reference data. Select the code that matches the documentation and confirm the active code set and payer requirements.
Where is K66 located in ICD-10-CM?
K66 is listed in Chapter 11, Diseases of the digestive system (K00-K95), within Diseases of peritoneum, retroperitoneum and pelvis (K65-K6A) (K65–K6A), under category K66, Other disorders of peritoneum.
What coding notes are listed for K66?
No inclusion terms are listed for K66 in this reference record. No code-first instruction is listed. No Excludes1 note is listed. Excludes2 notes: ascites (R18.-); peritoneal effusion (chronic) (R18.8).