2024 ICD-10-CM Diagnosis Code T56.1X4S
Toxic effect of mercury and its compounds, undetermined, sequela
- ICD-10-CM Code:
- T56.1X4S
- ICD-10 Code for:
- Toxic effect of mercury and its compounds, undet, sequela
- Is Billable?
- Yes - Valid for Submission
- Chronic Condition Indicator: [1]
- Not chronic
- Code Navigator:
T56.1X4S is a billable diagnosis code used to specify a medical diagnosis of toxic effect of mercury and its compounds, undetermined, sequela. The code is valid during the current fiscal year for the submission of HIPAA-covered transactions from October 01, 2023 through September 30, 2024. The code is exempt from present on admission (POA) reporting for inpatient admissions to general acute care hospitals.
T56.1X4S is a sequela code, includes a 7th character and should be used for complications that arise as a direct result of a condition like toxic effect of mercury and its compounds undetermined. According to ICD-10-CM Guidelines a "sequela" code should be used for chronic or residual conditions that are complications of an initial acute disease, illness or injury. The most common sequela is pain. Usually, two diagnosis codes are needed when reporting sequela. The first code describes the nature of the sequela while the second code describes the sequela or late effect.
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
Clinical Classification
Clinical Category is Poisoning/toxic effect/adverse effects/underdosing, sequela
- CCSR Category Code: INJ075
- Inpatient Default CCSR: Y - Yes, default inpatient assignment for principal diagnosis or first-listed diagnosis.
- Outpatient Default CCSR: Y - Yes, default outpatient assignment for principal diagnosis or first-listed diagnosis.
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
Present on Admission (POA)
T56.1X4S 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. Review other POA exempt codes here.
CMS POA Indicator Options and Definitions
POA Indicator | Reason for Code | CMS will pay the CC/MCC DRG? |
---|---|---|
Y | Diagnosis was present at time of inpatient admission. | YES |
N | Diagnosis was not present at time of inpatient admission. | NO |
U | Documentation insufficient to determine if the condition was present at the time of inpatient admission. | NO |
W | Clinically undetermined - unable to clinically determine whether the condition was present at the time of inpatient admission. | YES |
1 | Unreported/Not used - Exempt from POA reporting. | NO |
Convert T56.1X4S to ICD-9-CM
- ICD-9-CM Code: 909.1 - Late eff nonmed substanc
Approximate Flag - The approximate mapping means there is not an exact match between the ICD-10 and ICD-9 codes and the mapped code is not a precise representation of the original code.
Table of Drugs and Chemicals
The parent code T56.1X4 of the current diagnosis 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 mercury | T56.1X1 | T56.1X2 | T56.1X3 | T56.1X4 | ||
Mercury, mercurial, mercuric, mercurous (compounds) (cyanide) (fumes) (nonmedicinal) (vapor) NEC | T56.1X1 | T56.1X2 | T56.1X3 | T56.1X4 | ||
Mercury, mercurial, mercuric, mercurous (compounds) (cyanide) (fumes) (nonmedicinal) (vapor) NEC »ammoniated | T56.1X1 | T56.1X2 | T56.1X3 | T56.1X4 | ||
Mercury, mercurial, mercuric, mercurous (compounds) (cyanide) (fumes) (nonmedicinal) (vapor) NEC »anti-infective | T56.1X1 | T56.1X2 | T56.1X3 | T56.1X4 | ||
Mercury, mercurial, mercuric, mercurous (compounds) (cyanide) (fumes) (nonmedicinal) (vapor) NEC »anti-infective »local | T56.1X1 | T56.1X2 | T56.1X3 | T56.1X4 | ||
Mercury, mercurial, mercuric, mercurous (compounds) (cyanide) (fumes) (nonmedicinal) (vapor) NEC »anti-infective »systemic | T56.1X1 | T56.1X2 | T56.1X3 | T56.1X4 | ||
Mercury, mercurial, mercuric, mercurous (compounds) (cyanide) (fumes) (nonmedicinal) (vapor) NEC »anti-infective »topical | T56.1X1 | T56.1X2 | T56.1X3 | T56.1X4 | ||
Mercury, mercurial, mercuric, mercurous (compounds) (cyanide) (fumes) (nonmedicinal) (vapor) NEC »chloride (ammoniated) | T56.1X1 | T56.1X2 | T56.1X3 | T56.1X4 | ||
Mercury, mercurial, mercuric, mercurous (compounds) (cyanide) (fumes) (nonmedicinal) (vapor) NEC »chloride (ammoniated) »fungicide | T56.1X1 | T56.1X2 | T56.1X3 | T56.1X4 | ||
Mercury, mercurial, mercuric, mercurous (compounds) (cyanide) (fumes) (nonmedicinal) (vapor) NEC »diuretic NEC | T56.1X1 | T56.1X2 | T56.1X3 | T56.1X4 | ||
Mercury, mercurial, mercuric, mercurous (compounds) (cyanide) (fumes) (nonmedicinal) (vapor) NEC »fungicide | T56.1X1 | T56.1X2 | T56.1X3 | T56.1X4 | ||
Mercury, mercurial, mercuric, mercurous (compounds) (cyanide) (fumes) (nonmedicinal) (vapor) NEC »organic (fungicide) | T56.1X1 | T56.1X2 | T56.1X3 | T56.1X4 | ||
Mercury, mercurial, mercuric, mercurous (compounds) (cyanide) (fumes) (nonmedicinal) (vapor) NEC »oxide, yellow | T56.1X1 | T56.1X2 | T56.1X3 | T56.1X4 |
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.
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.