2026 ICD-10-CM Diagnosis Code T56.0X1AToxic effect of lead and its compounds, accidental (unintentional), initial encounter
T56.0X1A is a billable ICD-10-CM diagnosis code for toxic effect of lead and its compounds, accidental (unintentional), 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) and groups to MS-DRG 917 through 918. In AHRQ's Clinical Classifications Software (CCSR), this diagnosis falls under External cause codes: intent of injury, accidental/unintentional; External cause codes: poisoning by non-drug; and Toxic effects, initial encounter.
Code Identity
Code Classification
Approximate SynonymsGuidance
Alternate terms and clinical phrases that map to this code.
- Accidental exposure to inorganic lead compound
- Accidental exposure to organic lead compound
- Accidental poisoning by antiknock additives to petroleum
- Accidental poisoning by lead fumes
- Accidental poisoning by lead paints
- Accidental poisoning by petroleum fuels and cleaners
- Accidental poisoning by petroleum products
- Accidental poisoning caused by lead and/or lead compound
- Acute gout
- Acute lead nephropathy
- Acute lead-induced gout
- Acute polyarthritis
- Adverse reaction to lead and/or lead compound
- Anemia caused by lead
- Chronic gout caused by lead
- Chronic gouty arthritis
- Chronic gouty nephropathy
- Chronic lead nephropathy
- Chronic toxic interstitial nephritis
- Chronic tubulointerstitial nephritis caused by heavy metal
- Cognitive impairment due to lead toxicity
- Cognitive impairment due to toxicity of substance
- Gout caused by lead
- Gouty arthritis of multiple sites
- Heavy-metal-induced tubulointerstitial nephritis
- Lead and/or lead compound poisoning
- Lead neuropathy
- Lead-induced peripheral neuropathy
- Monoarticular acute gout caused by lead
- Monoarticular chronic gout caused by lead
- Motor neuron disease due to lead intoxication
- Nephropathy induced by lead
- Neurocognitive disorder
- Neuropathy caused by heavy metal
- Polyarticular acute gout caused by lead
- Polyarticular chronic gout caused by lead
- Saturnine nephropathy
- Saturnine tremor
- Toxic effect of inorganic lead compound
- Toxic effect of lead dioxide
- Toxic effect of organic lead compound
- Toxic effect of tetraethyl lead
- Urate nephropathy
Coding GuidelinesGuidance
The appropriate 7th character is to be added to each code from block Toxic effect of metals (T56). 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.
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.
| Substance | Accidental | Self-harm | Assault | Undetermined | Adverse Effect | Underdosing |
|---|---|---|---|---|---|---|
| Antiknock (tetraethyl lead) | T56.0X1 | T56.0X2 | T56.0X3 | T56.0X4 | – | – |
| Lead (dust) (fumes) (vapor) NEC | T56.0X1 | T56.0X2 | T56.0X3 | T56.0X4 | – | – |
| Lead (dust) (fumes) (vapor) NEC::acetate | T56.0X1 | T56.0X2 | T56.0X3 | T56.0X4 | – | – |
| Lead (dust) (fumes) (vapor) NEC::alkyl (fuel additive) | T56.0X1 | T56.0X2 | T56.0X3 | T56.0X4 | – | – |
| Lead (dust) (fumes) (vapor) NEC::anti-infectives | T56.0X1 | T56.0X2 | T56.0X3 | T56.0X4 | – | – |
| Lead (dust) (fumes) (vapor) NEC::antiknock compound (tetraethyl) | T56.0X1 | T56.0X2 | T56.0X3 | T56.0X4 | – | – |
| Lead (dust) (fumes) (vapor) NEC::arsenate, arsenite (dust) (herbicide) (insecticide) (vapor) | T56.0X1 | T56.0X2 | T56.0X3 | T56.0X4 | – | – |
| Lead (dust) (fumes) (vapor) NEC::carbonate | T56.0X1 | T56.0X2 | T56.0X3 | T56.0X4 | – | – |
| Lead (dust) (fumes) (vapor) NEC::carbonate::paint | T56.0X1 | T56.0X2 | T56.0X3 | T56.0X4 | – | – |
| Lead (dust) (fumes) (vapor) NEC::chromate | T56.0X1 | T56.0X2 | T56.0X3 | T56.0X4 | – | – |
| Lead (dust) (fumes) (vapor) NEC::chromate::paint | T56.0X1 | T56.0X2 | T56.0X3 | T56.0X4 | – | – |
| Lead (dust) (fumes) (vapor) NEC::dioxide | T56.0X1 | T56.0X2 | T56.0X3 | T56.0X4 | – | – |
| Lead (dust) (fumes) (vapor) NEC::inorganic | T56.0X1 | T56.0X2 | T56.0X3 | T56.0X4 | – | – |
| Lead (dust) (fumes) (vapor) NEC::iodide | T56.0X1 | T56.0X2 | T56.0X3 | T56.0X4 | – | – |
| Lead (dust) (fumes) (vapor) NEC::iodide::pigment (paint) | T56.0X1 | T56.0X2 | T56.0X3 | T56.0X4 | – | – |
| Lead (dust) (fumes) (vapor) NEC::monoxide (dust) | T56.0X1 | T56.0X2 | T56.0X3 | T56.0X4 | – | – |
| Lead (dust) (fumes) (vapor) NEC::monoxide (dust)::paint | T56.0X1 | T56.0X2 | T56.0X3 | T56.0X4 | – | – |
| Lead (dust) (fumes) (vapor) NEC::organic | T56.0X1 | T56.0X2 | T56.0X3 | T56.0X4 | – | – |
| Lead (dust) (fumes) (vapor) NEC::oxide | T56.0X1 | T56.0X2 | T56.0X3 | T56.0X4 | – | – |
| Lead (dust) (fumes) (vapor) NEC::oxide::paint | T56.0X1 | T56.0X2 | T56.0X3 | T56.0X4 | – | – |
| Lead (dust) (fumes) (vapor) NEC::paint | T56.0X1 | T56.0X2 | T56.0X3 | T56.0X4 | – | – |
| Lead (dust) (fumes) (vapor) NEC::salts | T56.0X1 | T56.0X2 | T56.0X3 | T56.0X4 | – | – |
| Lead (dust) (fumes) (vapor) NEC::specified compound NEC | T56.0X1 | T56.0X2 | T56.0X3 | T56.0X4 | – | – |
| Lead (dust) (fumes) (vapor) NEC::tetra-ethyl | T56.0X1 | T56.0X2 | T56.0X3 | T56.0X4 | – | – |
| Tetraethyl | T56.0X1 | T56.0X2 | T56.0X3 | T56.0X4 | – | – |
| Tetraethyl::lead | T56.0X1 | T56.0X2 | T56.0X3 | T56.0X4 | – | – |
| Tetraethyl::pyrophosphate | T56.0X1 | T56.0X2 | T56.0X3 | T56.0X4 | – | – |
Patient EducationClinical
Lead Poisoning
Lead is a metal that occurs naturally in the earth's crust. Lead can be found in all parts of our environment. Much of it comes from human activities such as mining and manufacturing. Lead used to be in paint; older houses may still have lead paint. You could be exposed to lead by:
Read the full article at MedlinePlus
Courtesy of MedlinePlus, a service of the U.S. National Library of Medicine.
Convert T56.0X1A to ICD-9-CMHistory
The closest ICD-9-CM equivalents under the General Equivalence Mappings.
Code HistoryHistory
Questions About T56.0X1AOverview
Is T56.0X1A a billable code?
Yes. This is a billable ICD-10-CM code, specific enough to report toxic effect of lead and its compounds, accidental (unintentional), initial encounter on HIPAA-covered claims from October 1, 2025 through September 30, 2026.
What does the 7th character A in T56.0X1A mean?
The final character A marks the initial encounter: use it while the patient is receiving active treatment for toxic effect of lead and its compounds, accidental (unintentional), such as an emergency visit or first evaluation.
What MS-DRG does T56.0X1A group to?
When toxic effect of lead and its compounds, accidental (unintentional), initial encounter is the principal diagnosis on an inpatient stay, it groups to MS-DRG 917, 918, with relative weights from 0.8571 to 1.5684 depending on complications. Higher weights mean higher Medicare reimbursement.
What is the ICD-9 equivalent of T56.0X1A?
Under the General Equivalence Mappings, toxic effect of lead and its compounds, accidental (unintentional), initial encounter converts to ICD-9-CM 984.9 (tox eff lead compnd NOS) and E866.0 (acc poisoning-lead). 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.
