K65.1 – Peritoneal abscess
ICD-10-CM 2027 diagnosis code · Diseases of peritoneum, retroperitoneum and pelvis
ICD-10-CM code
K65.1
- Code
K65.1(claims format:K651)- Description
- Peritoneal abscess
- Billable
- Yes – valid for HIPAA-covered transactions
- Valid for
- Dates of service October 1, 2026 – September 30, 2027 (FY2027)
- Chapter
- 11. Diseases of the digestive system (K00-K95)
- Block
- K65-K6A Diseases of peritoneum, retroperitoneum and pelvis
- Parent codes
- K65
Notes for K65.1
Applicable to:
- Abdominopelvic abscess
- Abscess (of) omentum
- Abscess (of) peritoneum
- Mesenteric abscess
- Retrocecal abscess
- Subdiaphragmatic abscess
- Subhepatic abscess
- Subphrenic abscess
Excludes2 (not included here):
- pelvic abscess (extraperitoneal) (K6A.0-)
Notes inherited from parent codes
Instructional notes at a category or block level apply to every code below it.
K65 – Peritonitis
Excludes1 (not coded here):
- acute appendicitis with generalized peritonitis (K35.2-)
- aseptic peritonitis (T81.6)
- benign paroxysmal peritonitis (E85.0)
- chemical peritonitis (T81.6)
- gonococcal peritonitis (A54.85)
- neonatal peritonitis (P78.0-P78.1)
- pelvic peritonitis, female (N73.3-N73.5)
- periodic familial peritonitis (E85.0)
- peritonitis due to talc or other foreign substance (T81.6)
- peritonitis in chlamydia (A74.81)
- peritonitis in diphtheria (A36.89)
- peritonitis in syphilis (late) (A52.74)
- peritonitis in tuberculosis (A18.31)
- peritonitis with or following abortion or ectopic or molar pregnancy (O00-O07, O08.0)
- peritonitis with or following appendicitis (K35.-)
- puerperal peritonitis (O85)
- retroperitoneal infections (K68.-)
Code also:
- if applicable diverticular disease of intestine (K57.-)
Index terms for K65.1
Entries in the ICD-10-CM alphabetic index that lead to this code:
- Abscess, omentum
- Abscess, subphrenic
- Abscess, subhepatic
- Abscess, retrocecal
- Abscess, abdominopelvic
- Sepsis, intra-abdominal
- Abscess, intraperitoneal
- Abscess, intra-abdominal
- Abscess, subdiaphragmatic
- Abscess, epiploon, epiploic
- Abscess, mesentery, mesenteric
- Abscess, peritoneum, peritoneal
- Abscess, diaphragm, diaphragmatic
- Abscess, abdomen, abdominal, cavity
- Peritonitis, with or following, abscess
- Abscess, pelvis, pelvic, male, peritoneal
- Abscess, pelvis, pelvic, female -, peritoneal
- Abscess, peritoneum, peritoneal, pelvic, male
Related codes in K65
- K65.0 – Generalized (acute) peritonitisBillable
- K65.2 – Spontaneous bacterial peritonitisBillable
- K65.3 – CholeperitonitisBillable
- K65.4 – Sclerosing mesenteritisBillable
- K65.8 – Other peritonitisBillable
- K65.9 – Peritonitis, unspecifiedBillable
Frequently asked questions
What is ICD-10 code K65.1?
K65.1 is the ICD-10-CM code for peritoneal abscess, in the block K65-K6A (Diseases of peritoneum, retroperitoneum and pelvis).
Is K65.1 a billable code?
Yes. K65.1 is a billable/specific code that can be used to indicate a diagnosis for reimbursement purposes.
What category does K65.1 belong to?
It belongs to category K65 – Peritonitis.
Source: CDC/NCHS ICD-10-CM FY2027 code files, tabular list and index. Reference only – code assignment must follow the official ICD-10-CM guidelines and documentation in the medical record.