2025 ICD-10-CM Diagnosis Code T56.821A
Toxic effect of gadolinium, accidental (unintentional), initial encounter
- ICD-10-CM Code:
- T56.821A
- ICD-10 Code for:
- Toxic effect of gadolinium, accidental (unintentional), init
- Is Billable?
- Yes - Valid for Submission
- Chronic Condition Indicator: [1]
- Not chronic
- Code Navigator:
T56.821A is a billable diagnosis code used to specify a medical diagnosis of toxic effect of gadolinium, accidental (unintentional), initial encounter. The code is valid during the current fiscal year for the submission of HIPAA-covered transactions from October 01, 2024 through September 30, 2025.
T56.821A is an initial encounter code, includes a 7th character and should be used while the patient is receiving active treatment for a condition like toxic effect of gadolinium accidental (unintentional). According to ICD-10-CM Guidelines an "initial encounter" doesn't necessarily means "initial visit". The 7th character should be used when the patient is undergoing active treatment regardless if new or different providers saw the patient over the course of a treatment. The appropriate 7th character codes should also be used even if the patient delayed seeking treatment for a condition.
Clinical Classification
Clinical Classifications group individual ICD-10-CM diagnosis codes into broader, clinically meaningful categories. These categories help simplify complex data by organizing related conditions under common clinical themes.
They are especially useful for data analysis, reporting, and clinical decision-making. Even when diagnosis codes differ, similar conditions can be grouped together based on their clinical relevance. Each category is assigned a unique CCSR code that represents a specific clinical concept, often tied to a body system or medical specialty.
External cause codes: intent of injury, accidental/unintentional
CCSR Code: EXT020
Inpatient Default: N - Not default inpatient assignment for principal diagnosis or first-listed diagnosis.
Outpatient Default: N - Not default outpatient assignment for principal diagnosis or first-listed diagnosis.
External cause codes: poisoning by non-drug
CCSR Code: EXT015
Inpatient Default: N - Not default inpatient assignment for principal diagnosis or first-listed diagnosis.
Outpatient Default: N - Not default outpatient assignment for principal diagnosis or first-listed diagnosis.
Toxic effects, initial encounter
CCSR Code: INJ023
Inpatient Default: Y - Yes, default inpatient assignment for principal diagnosis or first-listed diagnosis.
Outpatient Default: Y - Yes, default outpatient assignment for principal diagnosis or first-listed diagnosis.
Clinical Information
Gadolinium
an element of the rare earth family of metals. it has the atomic symbol gd, atomic number 64, and atomic weight 157.25. its oxide is used in the control rods of some nuclear reactors.Gadolinium DTPA
a complex of gadolinium with a chelating agent, diethylenetriamine penta-acetic acid (dtpa see pentetic acid), that is given to enhance the image in cranial and spinal mris. (from martindale, the extra pharmacopoeia, 30th ed, p706)
Coding Guidelines
The appropriate 7th character is to be added to each code from block Toxic effect of metals (T56). Use the following options for the aplicable episode of care:
- A - initial encounter
- D - subsequent encounter
- S - sequela
Replacement Code
T56821A replaces the following previously assigned ICD-10-CM code(s):
- T56.891A - Toxic effect of oth metals, accidental (unintentional), init
Table of Drugs and Chemicals
The parent code T56.821 of the current diagnosis code is referenced in the Table of Drugs and Chemicals, this table contains a classification of drugs, industrial solvents, corrosive gases, noxious plants, pesticides, and other toxic agents.
According to ICD-10-CM coding guidelines it is advised to do not code directly from the Table of Drugs and Chemicals, instead always refer back to the Tabular List when doing the initial coding. Each substance in the table is assigned a code according to the poisoning classification and external causes of adverse effects. It is important to use as many codes as necessary to specify all reported drugs, medicinal or chemical substances. If the same diagnosis code describes the causative agent for more than one adverse reaction, poisoning, toxic effect or underdosing, utilize the code only once.
| Substance | Poisoning Accidental (unintentional) |
Poisoning Accidental (self-harm) |
Poisoning Assault |
Poisoning Undetermined |
Adverse effect |
Underdosing |
|---|---|---|---|---|---|---|
| Gadolinium | T56.821 | T56.822 | T56.823 | T56.824 |
Code History
- FY 2024 - Code Added, effective from 10/1/2023 through 9/30/2024
Footnotes
[1] Not chronic - A diagnosis code that does not fit the criteria for chronic condition (duration, ongoing medical treatment, and limitations) is considered not chronic. Some codes designated as not chronic are acute conditions. Other diagnosis codes that indicate a possible chronic condition, but for which the duration of the illness is not specified in the code description (i.e., we do not know the condition has lasted 12 months or longer) also are considered not chronic.
