K59 — Other functional intestinal disorders
Is K59 billable?
No — K59 is a non-billable header code. K59 groups more specific codes and cannot be submitted on a claim. A valid ICD-10-CM code must be reported at the highest level of specificity available in its branch. Select one of the 14 billable codes beneath K59.
Billable codes under this header
- K59.1Functional diarrhea
- K59.2Neurogenic bowel, not elsewhere classified
- K59.4Anal spasm
- K59.9Functional intestinal disorder, unspecified
- K59.00Constipation, unspecified
- K59.01Slow transit constipation
- K59.02Outlet dysfunction constipation
- K59.03Drug induced constipation
- K59.04Chronic idiopathic constipation
- K59.09Other constipation
- K59.31Toxic megacolon
- K59.39Other megacolon
- K59.81Ogilvie syndrome
- K59.89Other specified functional intestinal disorders
K59 at a glance
| Code | K59 |
|---|---|
| Description | Other functional intestinal disorders |
| Billable | No — header code |
| Code set | ICD-10-CM FY2027 |
| Valid for encounters | October 1, 2026 – September 30, 2027 |
Excludes1 — never code together
The conditions below can never be reported together with K59 on the same claim. An Excludes1 note means the two conditions cannot occur in the same patient, so reporting both is a coding error.
Excludes2 — not included here
The conditions below are not part of K59, but a patient may have both at the same time. When documentation supports it, K59 and the excluded code may both be reported.
- functional disorders of stomach (K31.-)
Excludes2 — not included here — inherited from Chapter 11
The conditions below are not part of K59, but a patient may have both at the same time. When documentation supports it, K59 and the excluded code may both be reported.
- 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)
What codes fall under K59? (7)
How long has K59 existed?
K59 has been in ICD-10-CM since at least FY2016, the earliest fiscal year on record here.
Derived from the official order files for FY2016–FY2026. FY2017 and FY2020 publish no order file, so those years are not covered.
Which codes are confused with K59?
ICD-10-CM declares these codes mutually exclusive with K59 — exactly one of each pair can be correct for a given encounter.