2026 ICD-10-CM Diagnosis Code K66.0Peritoneal adhesions (postprocedural) (postinfection)
ICD-10-CM Codes›K00–K95›K65-K68›K66
- Billable — Valid for Submission
- Not Chronic
K66.0 is a billable ICD-10-CM diagnosis code for peritoneal adhesions (postprocedural) (postinfection). It is valid on HIPAA claims for fiscal year 2026 (October 1, 2025 through September 30, 2026) and groups to MS-DRG 393 through 395. In AHRQ's Clinical Classifications Software (CCSR), this diagnosis falls under Other specified and unspecified gastrointestinal disorders.
Code Identity
Code Classification
Approximate SynonymsGuidance
Alternate terms and clinical phrases that map to this code.
- Adhesion of abdominal wall
- Adhesion of diaphragm
- Adhesion of intestine
- Adhesion of mesentery
- Adhesion of omentum
- Adhesion of pelvic peritoneum
- Adhesion of pelvis
- Adhesion of stomach
- Colonic adhesions
- Duodenal adhesions
- Entrapment of intestine in abdominal adhesions
- Ileal adhesions
- Ileocecal adhesions
- Intestinal entrapment
- Jejunal adhesions
- Large bowel adhesions
- Male pelvic adhesions
- Periappendiceal adhesions
- Perirectal adhesions
- Peritoneal adhesion
- Pyloric adhesions
- Sigmoid flexure adhesions
- Small bowel adhesions
Tabular List NotesGuidance
Coding notes and annotation back-references applicable to this code.
Inclusion Terms
- Adhesions (of) abdominal (wall)
- Adhesions (of) diaphragm
- Adhesions (of) intestine
- Adhesions (of) male pelvis
- Adhesions (of) omentum
- Adhesions (of) stomach
- Adhesive bands
- Mesenteric adhesions
Type 1 Excludes
- peritoneal adhesions with intestinal obstruction K56.5
Type 2 Excludes
These terms are the conditions for which that code is to be used. The terms may be synonyms of the code title, or, in the case of "other specified" codes, the terms are a list of the various conditions assigned to that code. The inclusion terms are not necessarily exhaustive. Additional terms found only in the Alphabetic Index may also be assigned to a code.
A type 1 excludes note is a pure excludes note. It means "NOT CODED HERE!" An Excludes1 note indicates that the code excluded should never be used at the same time as the code above the Excludes1 note. An Excludes1 is used when two conditions cannot occur together, such as a congenital form versus an acquired form of the same condition.
A type 2 excludes note represents "Not included here". An excludes2 note indicates that the condition excluded is not part of the condition represented by the code, but a patient may have both conditions at the same time. When an Excludes2 note appears under a code, it is acceptable to use both the code and the excluded code together, when appropriate.
Index to Diseases and InjuriesGuidance
Alphabetical index entries that point to this code.
- Adhesions, adhesive (postinfective) - K66.0
- peritoneum, peritoneal (postinfective) - K66.0
- postprocedural - K66.0
- postoperative (gastrointestinal tract) - K66.0
External Cause of Injuries IndexGuidance
References for this code in the External Cause of Injuries Index.
- Adhesions, adhesive(postinfective)
- Adhesions, adhesive(postinfective)
- peritoneum, peritoneal (postinfective)
- Adhesions, adhesive(postinfective)
- peritoneum, peritoneal (postinfective)
- postprocedural
- Adhesions, adhesive(postinfective)
- postoperative (gastrointestinal tract)
Clinical ClassificationClinical
AHRQ’s CCSR groups this code into broader clinical categories.
Clinical InformationClinical
Pelvic Peritoneal Adhesion
adhesion(s) of the peritoneum to organs in the pelvic cavity.Peritoneal Adhesion
an adhesion of the peritoneum to proximal organs.Peritoneal Adhesion Excision|Excision Peritoneal Adhesions
a surgical procedure to remove peritoneal adhesions.Post-Procedural Pelvic Peritoneal Adhesion
pelvic peritoneal adhesion(s) following a procedure.
Patient EducationClinical
Adhesions
Adhesions are bands of scar-like tissue. Normally, internal tissues and organs have slippery surfaces so they can shift easily as the body moves. Adhesions cause tissues and organs to stick together. They might connect the loops of the intestines to each other, to nearby organs, or to the wall of the abdomen.
Read the full article at MedlinePlus
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Convert K66.0 to ICD-9-CMHistory
The closest ICD-9-CM equivalents under the General Equivalence Mappings.
Code HistoryHistory
Questions About K66.0Overview
Is K66.0 (Other disorders of peritoneum) a billable code?
Yes. This is a billable ICD-10-CM code, specific enough to report peritoneal adhesions (postprocedural) (postinfection) on HIPAA-covered claims from October 1, 2025 through September 30, 2026.
What MS-DRG does K66.0 group to?
When peritoneal adhesions (postprocedural) (postinfection) is the principal diagnosis on an inpatient stay, it groups to MS-DRG 393, 394, 395, with relative weights from 0.6490 to 1.5993 depending on complications. Higher weights mean higher Medicare reimbursement.
What is the ICD-9 equivalent of K66.0?
Under the General Equivalence Mappings, peritoneal adhesions (postprocedural) (postinfection) converts to ICD-9-CM 568.0 (peritoneal adhesions). The mapping is approximate, so confirm the match fits the documentation.
Footnotes
[1] Not chronic - A diagnosis code that does not fit the criteria for chronic condition (duration, ongoing medical treatment, and limitations) is considered not chronic. Some codes designated as not chronic are acute conditions. Other diagnosis codes that indicate a possible chronic condition, but for which the duration of the illness is not specified in the code description (i.e., we do not know the condition has lasted 12 months or longer) also are considered not chronic.
