E86.0 vs R68.2
E86.0 (Dehydration) compared with R68.2 (Dry mouth, unspecified), 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. R68.2 carries an Excludes1 note covering E86.0: “dry mouth due to dehydration (E86.0)”
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
| E86.0Dehydration | R68.2Dry mouth, unspecified | |
|---|---|---|
| Billing status | Billable | Billable |
| Classification | E00-E89 — Endocrine, Nutritional and Metabolic Diseases (E00-E89) | R00-R99 — Symptoms, Signs and Abnormal Clinical and Laboratory Findings, Not Elsewhere Classified (R00-R99) |
| Definition | Dehydration is a billable ICD-10-CM diagnosis code (E86.0). | Dry mouth, unspecified is a billable ICD-10-CM diagnosis code (R68.2). |
| Use additional code | code(s) for any associated disorders of electrolyte and acid-base balance (E87.-) | — |
Derived from the official CMS ICD-10-CM tabular data (FY2026). Not billing advice; verify sequencing rules for the encounter. All data sources