K66.9
Disorder of peritoneum, unspecified
BillableComplete code, valid to report
K66.9 (also written K669) is a billable ICD-10-CM diagnosis code for disorder of peritoneum, unspecified. It is part of the FY2027 code set, effective October 1, 2026. It is one of the 4 codes in category K66 (Other disorders of peritoneum). The Alphabetic Index lists it under 1 entry. Its coding notes include 10 Excludes2 entries.
Excludes2
Not included here. Both codes may be reported if the patient has both conditions.
Inherited from K66 Other disorders of peritoneum
Also from chapter/block level (8 notes)
Inherited from Chapter 11 Diseases of the digestive system
- certain conditions originating in the perinatal period (P04-P96)
- certain infectious and parasitic diseases (A00-B99)
- complications of pregnancy, childbirth and the puerperium (O00-O9A)
- congenital malformations, deformations and chromosomal abnormalities (Q00-Q99)
- endocrine, nutritional and metabolic diseases (E00-E88)
- injury, poisoning and certain other consequences of external causes (S00-T88)
- neoplasms (C00-D49)
- symptoms, signs and abnormal clinical and laboratory findings, not elsewhere classified (R00-R94)
Alphabetic Index terms
Terms the official Alphabetic Index lists for this code. 1 entry