2026 ICD-10-CM Diagnosis Code T36.6X1SPoisoning by rifampicins, accidental (unintentional), sequela

ICD-10-CM Codes›S00–T88›T36-T50›T36

ICD-10-CM T36.6X1S
CMSSource: CMS FY 2026 ICD-10-CM dataset · Effective Oct 1, 2025 – Sep 30, 2026

T36.6X1S is a billable ICD-10-CM diagnosis code for poisoning by rifampicins, accidental (unintentional), sequela. The 7th character S marks it as a sequela code, which reports a problem that remains after the original condition has resolved. It is valid on HIPAA claims for fiscal year 2026 (October 1, 2025 through September 30, 2026) and groups to MS-DRG 922 through 923. The code is exempt from POA reporting. Coders also document this condition as accidental rifampin overdose. In AHRQ's Clinical Classifications Software (CCSR), this diagnosis falls under Poisoning/toxic effect/adverse effects/underdosing, sequela.

Code Identity

ICD-10-CM Code
T36.6X1S
Billable Status
Yes — Valid for Submission
Code Describes
Poisoning by rifampicins, accidental (unintentional), sequela
Short Description
Poisoning by rifampicins, accidental, sequela
Parent Code
T36.6X1
Poisoning by rifampicins, accidental (unintentional)

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
CategoryT36Poisoning by, adverse effect of and underdosing of systemic antibiotics
This CodeT36.6X1SPoisoning by rifampicins, accidental (unintentional), sequela

Present on Admission (POA)Billing

T36.6X1S is exempt from POA reporting on inpatient claims to general acute care hospitals. Review other POA exempt codes.

Approximate SynonymsGuidance

Alternate terms and clinical phrases that map to this code.

  • Accidental rifampin overdose
  • Accidental rifampin poisoning
  • Poisoning by rifampin
  • Rifampin overdose

Coding GuidelinesGuidance

When coding a poisoning or reaction to the improper use of a medication (e.g., overdose, wrong substance given or taken in error, wrong route of administration), first assign the appropriate code from categories T36-T50. The poisoning codes have an associated intent as their 5th or 6th character (accidental, intentional self-harm, assault and undetermined). If the intent of the poisoning is unknown or unspecified, code the intent as accidental intent. The undetermined intent is only for use if the documentation in the record specifies that the intent cannot be determined. Use additional code(s) for all manifestations of poisonings.

The appropriate 7th character is to be added to each code from block Poisoning by, adverse effect of and underdosing of systemic antibiotics (T36). 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 INJ075
Poisoning/toxic effect/adverse effects/underdosing, sequela
Default principal diagnosis: inpatient Yes · outpatient Yes

Clinical InformationClinical

  • Rifabutin

    a broad-spectrum antibiotic that is being used as prophylaxis against disseminated mycobacterium avium complex infection in hiv-positive patients.

  • Rifampin

    a semisynthetic antibiotic produced from streptomyces mediterranei. it has a broad antibacterial spectrum, including activity against several forms of mycobacterium. in susceptible organisms it inhibits dna-dependent rna polymerase activity by forming a stable complex with the enzyme. it thus suppresses the initiation of rna synthesis. rifampin is bactericidal, and acts on both intracellular and extracellular organisms. (from gilman et al., goodman and gilman's the pharmacological basis of therapeutics, 9th ed, p1160)

  • Rifaximin

    a synthetic rifamycin derivative and anti-bacterial agent that is used for the treatment of gastroenteritis caused by escherichia coli infections. it may also be used in the treatment of hepatic encephalopathy.

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
AnsamycinT36.6X1T36.6X2T36.6X3T36.6X4T36.6X5T36.6X6
RifabutinT36.6X1T36.6X2T36.6X3T36.6X4T36.6X5T36.6X6
RifamideT36.6X1T36.6X2T36.6X3T36.6X4T36.6X5T36.6X6
RifampicinT36.6X1T36.6X2T36.6X3T36.6X4T36.6X5T36.6X6
Rifampicin::with isoniazidT36.6X1T36.6X2T36.6X3T36.6X4T36.6X5T36.6X6
RifampinT36.6X1T36.6X2T36.6X3T36.6X4T36.6X5T36.6X6
RifamycinT36.6X1T36.6X2T36.6X3T36.6X4T36.6X5T36.6X6
RifaximinT36.6X1T36.6X2T36.6X3T36.6X4T36.6X5T36.6X6

Patient EducationClinical

Antibiotics

Antibiotics are medicines that fight bacterial infections in people and animals. They work by killing the bacteria or by making it hard for the bacteria to grow and multiply.

The full article covers:

  • What are antibiotics?
  • What do antibiotics treat?
  • Do antibiotics treat viral infections?
  • What are the side effects of antibiotics?
  • Why is it important to take antibiotics only when they're needed?
  • How do I use antibiotics correctly?

Read the full article at MedlinePlus

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

Convert T36.6X1S to ICD-9-CMHistory

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

ICD-9-CM
909.0 Late eff drug poisoning
ApproximateCombination The match is approximate, and more than one code can be needed to describe the source diagnosis. Confirm with contextual judgment.
ICD-9-CM
E929.2 Late eff acc poisoning
ApproximateCombination The match is approximate, and more than one code can be needed to describe the source diagnosis. Confirm with contextual judgment.

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 T36.6X1SOverview

Is T36.6X1S (Poisoning by rifampicins, accidental (unintentional)) a billable code?

Yes. This is a billable ICD-10-CM code, specific enough to report poisoning by rifampicins, accidental (unintentional), sequela on HIPAA-covered claims from October 1, 2025 through September 30, 2026.

What does the 7th character S in T36.6X1S mean?

The final character S makes this a sequela code: it reports a lingering problem that remains after the poisoning by rifampicins, accidental (unintentional) itself has resolved, not the original event.

What MS-DRG does T36.6X1S group to?

When poisoning by rifampicins, accidental (unintentional), sequela is the principal diagnosis on an inpatient stay, it groups to MS-DRG 922, 923, with relative weights from 1.0177 to 1.7494 depending on complications. Higher weights mean higher Medicare reimbursement.

Is T36.6X1S exempt from POA reporting?

Yes. CMS lists this code among those exempt from present on admission reporting, so hospitals do not assign a POA indicator for poisoning by rifampicins, accidental (unintentional), sequela on inpatient claims.

What is the ICD-9 equivalent of T36.6X1S?

Under the General Equivalence Mappings, poisoning by rifampicins, accidental (unintentional), sequela converts to ICD-9-CM 909.0 (late eff drug poisoning) and E929.2 (late eff acc poisoning). 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.