K91.1 vs T86.91
K91.1 (Postgastric surgery syndromes) compared with T86.91 (Unspecified transplanted organ and tissue rejection), from the official CMS tabular data. Both may be reported when both conditions are documented (Excludes2).
Can these codes be reported together?
Yes, when both are documented. T86.91 carries an Excludes2 note covering K91.1: “postgastric surgery syndromes (K91.1)”
Excludes2 marks distinct conditions — both may be reported when both are documented.
Side by side
| K91.1Postgastric surgery syndromes | T86.91Unspecified transplanted organ and tissue rejection | |
|---|---|---|
| Billing status | Billable | Billable |
| Classification | K00-K95 — Diseases of the Digestive System (K00-K95) | S00-T88 — Injury, Poisoning and Certain Other Consequences of External Causes (S00-T88) |
| Definition | Postgastric surgery syndromes is a billable ICD-10-CM diagnosis code (K91.1). | Unspecified transplanted organ and tissue rejection is a billable ICD-10-CM diagnosis code (T86.91). |
| Includes | Dumping syndrome Postgastrectomy syndrome Postvagotomy syndrome | — |
| Use additional code | — | code to identify other transplant complications, such as: graft-versus-host disease (D89.81-) malignancy associated with organ transplant (C80.2) |
Derived from the official CMS ICD-10-CM tabular data (FY2026). Not billing advice; verify sequencing rules for the encounter. All data sources