D89.40 vs T86
D89.40 (Mast cell activation, unspecified) compared with T86 (Complications of transplanted organs and tissue), 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. D89.40 carries an Excludes2 note covering T86: “transplant failure and rejection (T86.-)”
Excludes2 marks distinct conditions — both may be reported when both are documented.
Side by side
| D89.40Mast cell activation, unspecified | T86Complications of transplanted organs and tissue | |
|---|---|---|
| Billing status | Billable | Non-billable header |
| Classification | D50-D89 — Diseases of the Blood and Blood-forming Organs and Certain Disorders Involving the Immune Mechanism (D50-D89) | S00-T88 — Injury, Poisoning and Certain Other Consequences of External Causes (S00-T88) |
| Definition | Mast cell activation, unspecified is a billable ICD-10-CM diagnosis code (D89.40). | Complications of transplanted organs and tissue is a non-billable ICD-10-CM category code (T86). |
| Includes | defects in the complement system immunodeficiency disorders, except human immunodeficiency virus [HIV] disease sarcoidosis Mast cell activation disorder, unspecified | — |
| 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