D72.18 vs D89
D72.18 (Eosinophilia in diseases classified elsewhere) compared with D89 (Other disorders involving the immune mechanism, not elsewhere classified), 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. D72.18 carries an Excludes1 note covering D89: “immunity disorders (D80-D89)”
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
| D72.18Eosinophilia in diseases classified elsewhere | D89Other disorders involving the immune mechanism, not elsewhere classified | |
|---|---|---|
| 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) | D50-D89 — Diseases of the Blood and Blood-forming Organs and Certain Disorders Involving the Immune Mechanism (D50-D89) |
| Definition | Eosinophilia in diseases classified elsewhere is a billable ICD-10-CM diagnosis code (D72.18). | Other disorders involving the immune mechanism, not elsewhere classified is a non-billable ICD-10-CM category code (D89). |
| Includes | — | defects in the complement system immunodeficiency disorders, except human immunodeficiency virus [HIV] disease sarcoidosis |
| Code first | underlying disease, such as: chronic myelomonocytic leukemia (C93.1-) | — |
Derived from the official CMS ICD-10-CM tabular data (FY2026). Not billing advice; verify sequencing rules for the encounter. All data sources