2024 ICD-10-CM Diagnosis Code T56.1X4

Toxic effect of mercury and its compounds, undetermined

ICD-10-CM Code:
T56.1X4
ICD-10 Code for:
Toxic effect of mercury and its compounds, undetermined
Is Billable?
Not Valid for Submission
Code Navigator:

Code Classification

  • Injury, poisoning and certain other consequences of external causes
    (S00–T88)
    • Toxic effects of substances chiefly nonmedicinal as to source
      (T51-T65)
      • Toxic effect of metals
        (T56)

T56.1X4 is a non-specific and non-billable diagnosis code code, consider using a code with a higher level of specificity for a diagnosis of toxic effect of mercury and its compounds, undetermined. The code is not specific and is NOT valid for the year 2024 for the submission of HIPAA-covered transactions. Category or Header define the heading of a category of codes that may be further subdivided by the use of 4th, 5th, 6th or 7th characters.

Specific Coding Applicable to Toxic effect of mercury and its compounds, undetermined

Non-specific codes like T56.1X4 require more digits to indicate the appropriate level of specificity. Consider using any of the following ICD-10-CM codes with a higher level of specificity when coding for toxic effect of mercury and its compounds, undetermined:

  • Use T56.1X4A for initial encounter - BILLABLE CODE

  • Use T56.1X4D for subsequent encounter - BILLABLE CODE

  • Use T56.1X4S for sequela - BILLABLE CODE

Approximate Synonyms

The following clinical terms are approximate synonyms or lay terms that might be used to identify the correct diagnosis code:

  • Contact dermatitis due to mercurial
  • Encephalopathy caused by heavy metal
  • Toxic encephalopathy due to mercury

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

Table of Drugs and Chemicals

The 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
Fulminate of mercuryT56.1X1T56.1X2T56.1X3T56.1X4  
Mercury, mercurial, mercuric, mercurous (compounds) (cyanide) (fumes) (nonmedicinal) (vapor) NECT56.1X1T56.1X2T56.1X3T56.1X4  
Mercury, mercurial, mercuric, mercurous (compounds) (cyanide) (fumes) (nonmedicinal) (vapor) NEC
  »ammoniated
T56.1X1T56.1X2T56.1X3T56.1X4  
Mercury, mercurial, mercuric, mercurous (compounds) (cyanide) (fumes) (nonmedicinal) (vapor) NEC
  »anti-infective
T56.1X1T56.1X2T56.1X3T56.1X4  
Mercury, mercurial, mercuric, mercurous (compounds) (cyanide) (fumes) (nonmedicinal) (vapor) NEC
  »anti-infective
    »local
T56.1X1T56.1X2T56.1X3T56.1X4  
Mercury, mercurial, mercuric, mercurous (compounds) (cyanide) (fumes) (nonmedicinal) (vapor) NEC
  »anti-infective
    »systemic
T56.1X1T56.1X2T56.1X3T56.1X4  
Mercury, mercurial, mercuric, mercurous (compounds) (cyanide) (fumes) (nonmedicinal) (vapor) NEC
  »anti-infective
    »topical
T56.1X1T56.1X2T56.1X3T56.1X4  
Mercury, mercurial, mercuric, mercurous (compounds) (cyanide) (fumes) (nonmedicinal) (vapor) NEC
  »chloride (ammoniated)
T56.1X1T56.1X2T56.1X3T56.1X4  
Mercury, mercurial, mercuric, mercurous (compounds) (cyanide) (fumes) (nonmedicinal) (vapor) NEC
  »chloride (ammoniated)
    »fungicide
T56.1X1T56.1X2T56.1X3T56.1X4  
Mercury, mercurial, mercuric, mercurous (compounds) (cyanide) (fumes) (nonmedicinal) (vapor) NEC
  »diuretic NEC
T56.1X1T56.1X2T56.1X3T56.1X4  
Mercury, mercurial, mercuric, mercurous (compounds) (cyanide) (fumes) (nonmedicinal) (vapor) NEC
  »fungicide
T56.1X1T56.1X2T56.1X3T56.1X4  
Mercury, mercurial, mercuric, mercurous (compounds) (cyanide) (fumes) (nonmedicinal) (vapor) NEC
  »organic (fungicide)
T56.1X1T56.1X2T56.1X3T56.1X4  
Mercury, mercurial, mercuric, mercurous (compounds) (cyanide) (fumes) (nonmedicinal) (vapor) NEC
  »oxide, yellow
T56.1X1T56.1X2T56.1X3T56.1X4  

Patient Education


Mercury

Mercury is an element that is found in air, water and soil. It has several forms. Metallic mercury is a shiny, silver-white, odorless liquid. If heated, it is a colorless, odorless gas. It also combines with other elements to form powders or crystals. Mercury is in many products. Metallic mercury is used in glass thermometers, silver dental fillings, and button batteries. Mercury salts may be used in skin creams and ointments. It's also used in many industries.

Mercury in the air settles into water. It can pass through the food chain and build up in fish, shellfish, and animals that eat fish. The nervous system is sensitive to all forms of mercury. Exposure to high levels can damage the brain and kidneys. Pregnant women can pass the mercury in their bodies to their babies.

It is important to protect your family from mercury exposure:

  • Carefully handle and dispose of products that contain mercury
  • Limit your consumption of fish with higher levels of mercury

Agency for Toxic Substances and Disease Registry


[Learn More in MedlinePlus]

Code History

  • FY 2024 - No Change, effective from 10/1/2023 through 9/30/2024
  • FY 2023 - No Change, effective from 10/1/2022 through 9/30/2023
  • FY 2022 - No Change, effective from 10/1/2021 through 9/30/2022
  • FY 2021 - No Change, effective from 10/1/2020 through 9/30/2021
  • FY 2020 - No Change, effective from 10/1/2019 through 9/30/2020
  • FY 2019 - No Change, effective from 10/1/2018 through 9/30/2019
  • FY 2018 - No Change, effective from 10/1/2017 through 9/30/2018
  • FY 2017 - No Change, effective from 10/1/2016 through 9/30/2017
  • FY 2016 - New Code, effective from 10/1/2015 through 9/30/2016. This was the first year ICD-10-CM was implemented into the HIPAA code set.