2026 ICD-10-CM Diagnosis Code T47.3X6AUnderdosing of saline and osmotic laxatives, initial encounter

ICD-10-CM Codes›S00–T88›T36-T50›T47

ICD-10-CM T47.3X6A
CMSSource: CMS FY 2026 ICD-10-CM dataset · Effective Oct 1, 2025 – Sep 30, 2026

T47.3X6A is a billable ICD-10-CM diagnosis code for underdosing of saline and osmotic laxatives, initial encounter. The 7th character A marks it as an initial encounter code, used while the patient is receiving active treatment. It is valid on HIPAA claims for fiscal year 2026 (October 1, 2025 through September 30, 2026). The code is not accepted as a principal diagnosis by the Medicare Code Editor. In AHRQ's Clinical Classifications Software (CCSR), this diagnosis falls under Underdosing of drugs and medicaments, initial encounter.

Code Identity

ICD-10-CM Code
T47.3X6A
Billable Status
Yes — Valid for Submission
Code Describes
Underdosing of saline and osmotic laxatives, initial encounter
Short Description
Underdosing of saline and osmotic laxatives, init encntr
Parent Code
T47.3X6
Underdosing of saline and osmotic laxatives

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
CategoryT47Poisoning by, adverse effect of and underdosing of agents primarily affecting the gastrointestinal system
This CodeT47.3X6AUnderdosing of saline and osmotic laxatives, initial encounter

Code EditsBilling

Medicare Code Editor checks that affect claim validity for T47.3X6A.

Unacceptable principal diagnosis
There are selected codes that describe a circumstance which influences an individual's health status but not a current illness or injury, or codes that are not specific manifestations but may be due to an underlying cause. These codes are considered unacceptable as a principal diagnosis.

Coding GuidelinesGuidance

Underdosing refers to taking less of a medication than is prescribed by a provider or a manufacturer's instruction. Codes for underdosing should never be assigned as principal or first-listed codes. If a patient has a relapse or exacerbation of the medical condition for which the drug is prescribed because of the reduction in dose, then the medical condition itself should be coded.

The appropriate 7th character is to be added to each code from block Poisoning by, adverse effect of and underdosing of agents primarily affecting the gastrointestinal system (T47). 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 INJ029
Underdosing of drugs and medicaments, initial encounter
Default principal diagnosis: inpatient No · outpatient No

Clinical InformationClinical

  • Lactulose

    a synthetic disaccharide used in the treatment of constipation and hepatic encephalopathy. it has also been used in the diagnosis of gastrointestinal disorders. (from martindale, the extra pharmacopoeia, 30th ed, p887)

  • Mannitol

    a diuretic and renal diagnostic aid related to sorbitol. it has little significant energy value as it is largely eliminated from the body before any metabolism can take place. it can be used to treat oliguria associated with kidney failure or other manifestations of inadequate renal function and has been used for determination of glomerular filtration rate. mannitol is also commonly used as a research tool in cell biological studies, usually to control osmolarity.

  • Mannitol Dehydrogenases

    sugar alcohol dehydrogenases that have specificity for mannitol. enzymes in this category are generally classified according to their preference for a specific reducing cofactor.

  • Mannitol Phosphates

    phosphoric acid esters of mannitol.

  • Mannomustine

    nitrogen mustard derivative alkylating agent used as antineoplastic. it causes severe bone marrow depression and is a powerful vesicant.

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
CarbamideT47.3X1T47.3X2T47.3X3T47.3X4T47.3X5T47.3X6
Carbamide::peroxideT47.3X1T47.3X2T47.3X3T47.3X4T47.3X5T47.3X6
Carbamide::topicalT47.3X1T47.3X2T47.3X3T47.3X4T47.3X5T47.3X6
Epsom saltT47.3X1T47.3X2T47.3X3T47.3X4T47.3X5T47.3X6
LactuloseT47.3X1T47.3X2T47.3X3T47.3X4T47.3X5T47.3X6
MannitolT47.3X1T47.3X2T47.3X3T47.3X4T47.3X5T47.3X6
Mannitol::hexanitrateT47.3X1T47.3X2T47.3X3T47.3X4T47.3X5T47.3X6
UreaT47.3X1T47.3X2T47.3X3T47.3X4T47.3X5T47.3X6
Urea::peroxideT47.3X1T47.3X2T47.3X3T47.3X4T47.3X5T47.3X6
Urea::stibamineT47.3X1T47.3X2T47.3X3T47.3X4T47.3X5T47.3X6
Urea::topicalT47.3X1T47.3X2T47.3X3T47.3X4T47.3X5T47.3X6

Patient EducationClinical

Medication Errors

Medicines treat infectious diseases, prevent problems from chronic diseases, and ease pain. But medicines can also cause harmful reactions if not used correctly. Errors can happen in the hospital, at the health care provider's office, at the pharmacy, or at home. You can help prevent errors by:

Read the full article at MedlinePlus

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

Convert T47.3X6A to ICD-9-CMHistory

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

ICD-9-CM
No Map There is no ICD-9 equivalent for this code.

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 T47.3X6AOverview

Is T47.3X6A (Underdosing of saline and osmotic laxatives) a billable code?

Yes. This is a billable ICD-10-CM code, specific enough to report underdosing of saline and osmotic laxatives, initial encounter on HIPAA-covered claims from October 1, 2025 through September 30, 2026.

What does the 7th character A in T47.3X6A mean?

The final character A marks the initial encounter: use it while the patient is receiving active treatment for underdosing of saline and osmotic laxatives, such as an emergency visit or first evaluation.

Can T47.3X6A be a principal diagnosis?

No. The Medicare Code Editor rejects this code as a principal diagnosis because underdosing of saline and osmotic laxatives, initial encounter describes a circumstance that influences health status rather than a current illness. Report it as a secondary diagnosis.

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.