2026 ICD-10-CM Diagnosis Code T50.1X3SPoisoning by loop [high-ceiling] diuretics, assault, sequela

ICD-10-CM Codes›S00–T88›T36-T50›T50

ICD-10-CM T50.1X3S
CMSSource: CMS FY 2026 ICD-10-CM dataset · Effective Oct 1, 2025 – Sep 30, 2026

T50.1X3S is a billable ICD-10-CM diagnosis code for poisoning by loop [high-ceiling] diuretics, assault, 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

ICD-10-CM Code
T50.1X3S
Billable Status
Yes — Valid for Submission
Code Describes
Poisoning by loop [high-ceiling] diuretics, assault, sequela
Short Description
Poisoning by loop [high-ceiling] diuretics, assault, sequela
Same as the full description in the CMS dataset.
Parent Code
T50.1X3
Poisoning by loop [high-ceiling] diuretics, assault

Code Classification

ChapterS00–T88Injury, poisoning and certain other consequences of external causes
SectionT36-T50Poisoning by, adverse effect of and underdosing of drugs, medicaments and biological substances
CategoryT50Poisoning by, adverse effect of and underdosing of diuretics and other and unspecified drugs, medicaments and biological substances
This CodeT50.1X3SPoisoning by loop [high-ceiling] diuretics, assault, sequela

Present on Admission (POA)Billing

T50.1X3S is exempt from POA reporting on inpatient claims to general acute care hospitals. Review other POA exempt codes.

Coding GuidelinesGuidance

When coding a poisoning or reaction to the improper use of a medication (e.g., overdose, wrong substance given or taken in error, wrong route of administration), first assign the appropriate code from categories T36-T50. The poisoning codes have an associated intent as their 5th or 6th character (accidental, intentional self-harm, assault and undetermined). If the intent of the poisoning is unknown or unspecified, code the intent as accidental intent. The undetermined intent is only for use if the documentation in the record specifies that the intent cannot be determined. Use additional code(s) for all manifestations of poisonings.

The appropriate 7th character is to be added to each code from block Poisoning by, adverse effect of and underdosing of diuretics and other and unspecified drugs, medicaments and biological substances (T50). 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.

CCSR INJ075
Poisoning/toxic effect/adverse effects/underdosing, sequela
Default principal diagnosis: inpatient Yes · outpatient Yes

Clinical InformationClinical

  • Bumetanide

    a sulfamyl diuretic.

  • Sodium Potassium Chloride Symporter Inhibitors

    agents that inhibit sodium-potassium-chloride symporters which are concentrated in the thick ascending limb at the junction of the loop of henle and kidney tubules, distal. they act as diuretics. excess use is associated with hypokalemia and hyperglycemia.

  • Solute Carrier Family 12, Member 1

    na-k-cl transporter in the ascending limb of loop of henle. it mediates active reabsorption of sodium chloride and is inhibited by loop diuretics such as furosemide; and bumetanide. mutations in the gene encoding slc12a1 are associated with a bartter syndrome.

  • Solute Carrier Family 12, Member 2

    na-k-cl transporter ubiquitously expressed. it plays a key role in salt secretion in epithelial cells and cell volume regulation in nonepithelial cells.

  • Ethacrynic Acid

    a compound that inhibits symport of sodium, potassium, and chloride primarily in the ascending limb of henle, but also in the proximal and distal tubules. this pharmacological action results in excretion of these ions, increased urinary output, and reduction in extracellular fluid. this compound has been classified as a loop or high ceiling diuretic.

  • Furosemide

    a benzoic-sulfonamide-furan. it is a diuretic with fast onset and short duration that is used for edema and chronic renal insufficiency.

  • Ticrynafen

    a novel diuretic with uricosuric action. it has been proposed as an antihypertensive agent.

Table of Drugs and ChemicalsClinical

Substances in the Table of Drugs and Chemicals that reference this code family. Always confirm in the Tabular List before coding.

SubstanceAccidentalSelf-harmAssaultUndeter­minedAdverse
Effect		Under­dosing
BumetanideT50.1X1T50.1X2T50.1X3T50.1X4T50.1X5T50.1X6
EdecrinT50.1X1T50.1X2T50.1X3T50.1X4T50.1X5T50.1X6
Etacrynate sodiumT50.1X1T50.1X2T50.1X3T50.1X4T50.1X5T50.1X6
Etacrynic acidT50.1X1T50.1X2T50.1X3T50.1X4T50.1X5T50.1X6
Ethacrynic acidT50.1X1T50.1X2T50.1X3T50.1X4T50.1X5T50.1X6
EtozolinT50.1X1T50.1X2T50.1X3T50.1X4T50.1X5T50.1X6
FrusemideT50.1X1T50.1X2T50.1X3T50.1X4T50.1X5T50.1X6
FurosemideT50.1X1T50.1X2T50.1X3T50.1X4T50.1X5T50.1X6
LasixT50.1X1T50.1X2T50.1X3T50.1X4T50.1X5T50.1X6
Lyovac Sodium EdecrinT50.1X1T50.1X2T50.1X3T50.1X4T50.1X5T50.1X6
PiretanideT50.1X1T50.1X2T50.1X3T50.1X4T50.1X5T50.1X6
TicrynafenT50.1X1T50.1X2T50.1X3T50.1X4T50.1X5T50.1X6
Tienilic acidT50.1X1T50.1X2T50.1X3T50.1X4T50.1X5T50.1X6

Patient EducationClinical

Poisoning

A poison is any substance that is harmful to your body. You might swallow it, inhale it, inject it, or absorb it through your skin. Any substance can be poisonous if too much is taken. Poisons can include:

Read the full article at MedlinePlus

Courtesy of MedlinePlus, a service of the U.S. National Library of Medicine.

Convert T50.1X3S to ICD-9-CMHistory

The closest ICD-9-CM equivalents under the General Equivalence Mappings.

ICD-9-CM
909.0 Late eff drug poisoning
ApproximateCombination The match is approximate, and more than one code can be needed to describe the source diagnosis. Confirm with contextual judgment.
ICD-9-CM
E969 Late effect assault
ApproximateCombination The match is approximate, and more than one code can be needed to describe the source diagnosis. Confirm with contextual judgment.

Code HistoryHistory

FY 2016AddedAdded to the ICD-10-CM code setEffective October 1, 2015, the first year of ICD-10-CM.
FY 2017–2025No changes
FY 2026CurrentCurrent code set, no changesEffective October 1, 2025 through September 30, 2026.

Questions About T50.1X3SOverview

Is T50.1X3S (Poisoning by loop [high-ceiling] diuretics, assault) a billable code?

Yes. This is a billable ICD-10-CM code, specific enough to report poisoning by loop [high-ceiling] diuretics, assault, sequela on HIPAA-covered claims from October 1, 2025 through September 30, 2026.

What does the 7th character S in T50.1X3S mean?

The final character S makes this a sequela code: it reports a lingering problem that remains after the poisoning by loop [high-ceiling] diuretics, assault itself has resolved, not the original event.

What MS-DRG does T50.1X3S group to?

When poisoning by loop [high-ceiling] diuretics, assault, 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 T50.1X3S 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 poisoning by loop [high-ceiling] diuretics, assault, sequela on inpatient claims.

What is the ICD-9 equivalent of T50.1X3S?

Under the General Equivalence Mappings, poisoning by loop [high-ceiling] diuretics, assault, sequela converts to ICD-9-CM 909.0 (late eff drug poisoning) and E969 (late effect assault). The mapping is approximate, so confirm the match fits the documentation.

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.