K59.1 vs R19.4
K59.1 (Functional diarrhea) compared with R19.4 (Change in bowel habit), from the official CMS tabular data. Do not report these codes together: the official tabular list marks them Excludes1.
Can these codes be reported together?
No — do not report together. K59.1 carries an Excludes1 note covering R19.4: “change in bowel habit NOS (R19.4)”
Sole exception: when the two conditions are documented as unrelated to each other (ICD-10-CM Official Guidelines, Section I.A.12.a).
No — do not report together. R19.4 carries an Excludes1 note covering K59.1: “functional diarrhea (K59.1)”
Sole exception: when the two conditions are documented as unrelated to each other (ICD-10-CM Official Guidelines, Section I.A.12.a).
Side by side
| K59.1Functional diarrhea | R19.4Change in bowel habit | |
|---|---|---|
| Billing status | Billable | Billable |
| Classification | K00-K95 — Diseases of the Digestive System (K00-K95) | R00-R99 — Symptoms, Signs and Abnormal Clinical and Laboratory Findings, Not Elsewhere Classified (R00-R99) |
| Definition | Functional diarrhea is a billable ICD-10-CM diagnosis code (K59.1). | Change in bowel habit is a billable ICD-10-CM diagnosis code (R19.4). |
Derived from the official CMS ICD-10-CM tabular data (FY2026). Not billing advice; verify sequencing rules for the encounter. All data sources