ICD-10 Code T50.2X4S

Poisoning by carbonic-anhydrase inhibitors, benzothiadiazides and other diuretics, undetermined, sequela

Version 2019 Replaced Code Billable Code POA Exempt
ICD-10: T50.2X4S
Short Description:Poisn by crbnc-anhydr inhibtr,benzo/oth diuretc, undet, sqla
Long Description:Poisoning by carbonic-anhydrase inhibitors, benzothiadiazides and other diuretics, undetermined, sequela

Valid for Submission

ICD-10 T50.2X4S is a billable code used to specify a medical diagnosis of poisoning by carbonic-anhydrase inhibitors, benzothiadiazides and other diuretics, undetermined, sequela. The code is valid for the year 2019 for the submission of HIPAA-covered transactions.

Deleted Code

This code was deleted in the 2019 ICD-10 code set with the code(s) listed below. The National Center for Health Statistics (NCHS) has published an update to the ICD-10-CM diagnosis codes which became effective October 1, 2018. This code was replaced for the FY 2019 (October 1, 2018 - September 30, 2019).

  • K59.03 - Drug induced constipation

Code Classification

  • Injury, poisoning and certain other consequences of external causes (S00–T98)
    • Poisoning by, adverse effect of and underdosing of drugs, medicaments and biological substances (T36-T50)
      • Diuretics and oth and unsp drug/meds/biol subst (T50)

Information for Medical Professionals

Convert T50.2X4S to ICD-9

The following crosswalk between ICD-10 to ICD-9 is based based on the General Equivalence Mappings (GEMS) information:

  • 909.0 - Late eff drug poisoning (Combination Flag)
  • E989 - Late eff inj-undet circ (Combination Flag)

Present on Admission (POA)

T50.2X4S is exempt from POA reporting - The Present on Admission (POA) indicator is used for diagnosis codes included in claims involving inpatient admissions to general acute care hospitals. POA indicators must be reported to CMS on each claim to facilitate the grouping of diagnoses codes into the proper Diagnostic Related Groups (DRG). CMS publishes a listing of specific diagnosis codes that are exempt from the POA reporting requirement.

CMS POA Indicator Options and Definitions
POA Indicator CodePOA Reason for CodeCMS will pay the CC/MCC DRG?
YDiagnosis was present at time of inpatient admission.YES
NDiagnosis was not present at time of inpatient admission.NO
UDocumentation insufficient to determine if the condition was present at the time of inpatient admission.NO
WClinically undetermined - unable to clinically determine whether the condition was present at the time of inpatient admission.YES
1Unreported/Not used - Exempt from POA reporting. NO


The following clinical terms are approximate synonyms:

  • Acetazolamide overdose
  • Acetazolamide overdose of undetermined intent
  • Acetazolamide poisoning of undetermined intent
  • Bendroflumethiazide overdose
  • Bendroflumethiazide overdose of undetermined intent
  • Bendroflumethiazide poisoning
  • Bendroflumethiazide poisoning of undetermined intent
  • Carbonic acid anhydrase inhibitor overdose
  • Chlorothiazide overdose
  • Chlorothiazide overdose of undetermined intent
  • Chlorothiazide poisoning of undetermined intent
  • Mercurial diuretic overdose
  • Mersalyl overdose
  • Mersalyl overdose of undetermined intent
  • Osmotic diuretic overdose
  • Osmotic diuretic overdose of undetermined intent
  • Osmotic diuretic poisoning
  • Osmotic diuretic poisoning of undetermined intent
  • Poisoning by acetazolamide
  • Poisoning by carbonic acid anhydrase inhibitor
  • Poisoning by chlorothiazide
  • Potassium sparing diuretic overdose
  • Potassium sparing diuretic overdose of undetermined intent
  • Potassium sparing diuretic poisoning
  • Potassium sparing diuretic poisoning of undetermined intent
  • Saluretic poisoning of undetermined intent
  • Thiazide diuretic poisoning

Information for Patients


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

  • Prescription or over-the-counter medicines taken in doses that are too high
  • Overdoses of illegal drugs
  • Carbon monoxide from gas appliances
  • Household products, such as laundry powder or furniture polish
  • Pesticides
  • Indoor or outdoor plants
  • Metals such as lead and mercury

The effects of poisoning range from short-term illness to brain damage, coma, and death. To prevent poisoning it is important to use and store products exactly as their labels say. Keep dangerous products where children can't get to them. Treatment for poisoning depends on the type of poison. If you suspect someone has been poisoned, call your local poison control center at 1-800-222-1222 right away.

  • Poisoning (Medical Encyclopedia)
  • Poisoning first aid (Medical Encyclopedia)
  • Toxicology screen (Medical Encyclopedia)

[Learn More]

ICD-10 Footnotes

General Equivalence Map Definitions
The ICD-10 and ICD-9 GEMs are used to facilitate linking between the diagnosis codes in ICD-9-CM and the new ICD-10-CM code set. The GEMs are the raw material from which providers, health information vendors and payers can derive specific applied mappings to meet their needs.

  • Approximate Flag - The approximate flag is on, indicating that the relationship between the code in the source system and the code in the target system is an approximate equivalent.
  • No Map Flag - The no map flag indicates that a code in the source system is not linked to any code in the target system.
  • Combination Flag - The combination flag indicates that more than one code in the target system is required to satisfy the full equivalent meaning of a code in the source system.