B26.81 vs K77
B26.81 (Mumps hepatitis) compared with K77 (Liver disorders in diseases classified elsewhere), 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. K77 carries an Excludes1 note covering B26.81: “mumps hepatitis (B26.81)”
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
| B26.81Mumps hepatitis | K77Liver disorders in diseases classified elsewhere | |
|---|---|---|
| Billing status | Billable | Billable |
| Classification | A00-B99 — Certain Infectious and Parasitic Diseases (A00-B99) | K00-K95 — Diseases of the Digestive System (K00-K95) |
| Definition | Mumps hepatitis is a billable ICD-10-CM diagnosis code (B26.81). | Liver disorders in diseases classified elsewhere is a billable ICD-10-CM diagnosis code (K77). |
| Includes | epidemic parotitis infectious parotitis | — |
| Code first | — | underlying disease, such as: amyloidosis (E85.-) |
Derived from the official CMS ICD-10-CM tabular data (FY2026). Not billing advice; verify sequencing rules for the encounter. All data sources