K59.9 – Functional intestinal disorder, unspecified
ICD-10-CM 2027 diagnosis code · Other diseases of intestines
ICD-10-CM code
K59.9
- Code
K59.9(claims format:K599)- Description
- Functional intestinal disorder, unspecified
- 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
- K55-K64 Other diseases of intestines
- Parent codes
- K59
Notes inherited from parent codes
Instructional notes at a category or block level apply to every code below it.
K59 – Other functional intestinal disorders
Excludes1 (not coded here):
Excludes2 (not included here):
- functional disorders of stomach (K31.-)
Index terms for K59.9
Entries in the ICD-10-CM alphabetic index that lead to this code:
- Upset, intestinal
- Dysfunction, colon
- Dysfunction, rectum
- Distress, intestinal
- Syndrome, functional, bowel
- Complaint, bowel, functional
- Complaint, intestine, functional
- Disease, diseased, bowel, functional
- Disease, diseased, colon, functional
- Disease, diseased, intestine, functional
- Disease, diseased, gastrointestinal, functional
- Disorder, intestine, intestinal, functional NEC
Related codes in K59
Frequently asked questions
What is ICD-10 code K59.9?
K59.9 is the ICD-10-CM code for functional intestinal disorder, unspecified, in the block K55-K64 (Other diseases of intestines).
Is K59.9 a billable code?
Yes. K59.9 is a billable/specific code that can be used to indicate a diagnosis for reimbursement purposes.
What category does K59.9 belong to?
It belongs to category K59 – Other functional intestinal disorders.
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.