2026 ICD-10-CM Diagnosis Code T56.824SToxic effect of gadolinium, undetermined, sequela
T56.824S is a billable ICD-10-CM diagnosis code for toxic effect of gadolinium, undetermined, sequela. The 7th character S marks it as a sequela code, which reports a problem that remains after the original condition has resolved. It is valid on HIPAA claims for fiscal year 2026 (October 1, 2025 through September 30, 2026) and groups to MS-DRG 922 through 923. The code is exempt from POA reporting. In AHRQ's Clinical Classifications Software (CCSR), this diagnosis falls under Poisoning/toxic effect/adverse effects/underdosing, sequela.
Code Identity
Code Classification
Present on Admission (POA)Billing
T56.824S is exempt from POA reporting on inpatient claims to general acute care hospitals. Review other POA exempt codes.
Coding GuidelinesGuidance
The appropriate 7th character is to be added to each code from block Toxic effect of metals (T56). Use the following options for the applicable episode of care:
- A - initial encounter
- D - subsequent encounter
- S - sequela
Source: ICD-10-CM Official Guidelines for Coding and Reporting, FY 2026, published by CMS and the National Center for Health Statistics.
Clinical ClassificationClinical
AHRQ’s CCSR groups this code into broader clinical categories.
Clinical InformationClinical
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)
Table of Drugs and ChemicalsClinical
Code History & ChangesHistory
Replacement T56.824S replaces the following previously assigned code(s):
- T56.894S - Toxic effect of other metals, undetermined, sequela
Questions About T56.824SOverview
Is T56.824S (Toxic effect of gadolinium, undetermined) a billable code?
Yes. This is a billable ICD-10-CM code, specific enough to report toxic effect of gadolinium, undetermined, sequela on HIPAA-covered claims from October 1, 2025 through September 30, 2026.
What does the 7th character S in T56.824S mean?
The final character S makes this a sequela code: it reports a lingering problem that remains after the toxic effect of gadolinium, undetermined itself has resolved, not the original event.
What MS-DRG does T56.824S group to?
When toxic effect of gadolinium, undetermined, sequela is the principal diagnosis on an inpatient stay, it groups to MS-DRG 922, 923, with relative weights from 1.0177 to 1.7494 depending on complications. Higher weights mean higher Medicare reimbursement.
Is T56.824S exempt from POA reporting?
Yes. CMS lists this code among those exempt from present on admission reporting, so hospitals do not assign a POA indicator for toxic effect of gadolinium, undetermined, sequela on inpatient claims.
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.
