R94 vs T88.7
R94 (Abnormal results of function studies) compared with T88.7 (Unspecified adverse effect of drug or medicament), 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. T88.7 carries an Excludes1 note covering R94: “specified adverse effects of drugs and medicaments (A00-R94 and T80-T88.6, T88.8)”
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
| R94Abnormal results of function studies | T88.7Unspecified adverse effect of drug or medicament | |
|---|---|---|
| Billing status | Non-billable header | Non-billable header |
| Classification | R00-R99 — Symptoms, Signs and Abnormal Clinical and Laboratory Findings, Not Elsewhere Classified (R00-R99) | S00-T88 — Injury, Poisoning and Certain Other Consequences of External Causes (S00-T88) |
| Definition | Abnormal results of function studies is a non-billable ICD-10-CM category code (R94). | Unspecified adverse effect of drug or medicament is a non-billable ICD-10-CM category code (T88.7). |
| 7th character | — | The appropriate 7th character is to be added to each code from category T88 |
| Includes | abnormal results of radionuclide [radioisotope] uptake studies abnormal results of scintigraphy nonspecific abnormal findings on diagnostic imaging by computerized axial tomography [CAT scan] nonspecific abnormal findings on diagnostic imaging by magnetic resonance imaging [MRI][NMR] | Drug hypersensitivity NOS Drug reaction NOS |
| Use additional code | — | code for adverse effect, if applicable, to identify drug (T36-T50 with fifth or sixth character 5) code(s) to identify the specified condition resulting from the complication code to identify devices involved and details of circumstances (Y62-Y82) |
Derived from the official CMS ICD-10-CM tabular data (FY2026). Not billing advice; verify sequencing rules for the encounter. All data sources