2027 ICD-10-CM Diagnosis Code T62.0X4SToxic effect of ingested mushrooms, undetermined, sequela

ICD-10-CM Codes›S00–T88›T51-T65›T62

ICD-10-CM T62.0X4S
CMSSource: CMS FY 2027 ICD-10-CM dataset · Effective Oct 1, 2026 – Sep 30, 2027

T62.0X4S is a billable ICD-10-CM diagnosis code for toxic effect of ingested mushrooms, undetermined, 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 2027 (October 1, 2026 through September 30, 2027) and groups to MS-DRG 922 through 923. The code is exempt from POA reporting. In AHRQ's Clinical Classifications Software (CCSR), this diagnosis falls under Poisoning/toxic effect/adverse effects/underdosing, sequela.

Code Identity

ICD-10-CM Code
T62.0X4S
Billable Status
Yes — Valid for Submission
Code Describes
Toxic effect of ingested mushrooms, undetermined, sequela
Short Description
Toxic effect of ingested mushrooms, undetermined, sequela
Same as the full description in the CMS dataset.
Parent Code
T62.0X4
Toxic effect of ingested mushrooms, undetermined

Code Classification

ChapterS00–T88Injury, poisoning and certain other consequences of external causes
SectionT51-T65Toxic effects of substances chiefly nonmedicinal as to source
CategoryT62Toxic effect of other noxious substances eaten as food
This CodeT62.0X4SToxic effect of ingested mushrooms, undetermined, sequela

Present on Admission (POA)Billing

T62.0X4S is exempt from POA reporting on inpatient claims to general acute care hospitals. Review the other POA exempt codes in Toxic effects of substances chiefly nonmedicinal as to source (T51-T65).

Coding GuidelinesGuidance

The appropriate 7th character is to be added to each code from block Toxic effect of other noxious substances eaten as food (T62). 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 2027, published by CMS and the National Center for Health Statistics.

Instructional NotesGuidance

Instructions from the official ICD-10-CM Tabular List that apply to T62.0X4S: its own notes plus those printed at T62, block T51-T65, and Chapter 19. A note printed at a category, block or chapter applies to every code under it.

Excludes1

Not coded here: the excluded code is never reported together with this one, unless the two conditions are unrelated.

From T62 Toxic effect of other noxious substances eaten as food applies to 60 codes
  • allergic reaction to food, such as:
  • anaphylactic shock (reaction) due to adverse food reaction (T78.0-)
  • bacterial food borne intoxications (A05.-)
  • dermatitis (L23.6, L25.4, L27.2)
  • food protein-induced enterocolitis syndrome (K52.21)
  • food protein-induced enteropathy (K52.22)
  • gastroenteritis (noninfective) (K52.29)
  • toxic effect of aflatoxin and other mycotoxins (T64)
  • toxic effect of cyanides (T65.0-)
  • toxic effect of hydrogen cyanide (T57.3-)
  • toxic effect of mercury (T56.1-)
From Block T51-T65 Toxic effects of substances chiefly nonmedicinal as to source applies to 1,680 codes
  • contact with and (suspected) exposure to toxic substances (Z77.-)

Excludes2

Not included here: the excluded condition is not part of this code, but a patient may have both, so both codes may be reported.

From Chapter 19 (S00-T88) Injury, poisoning and certain other consequences of external causes applies to 41,187 codes

Use Additional Code

Add a second code, after this one, to fully describe the condition.

From Block T51-T65 Toxic effects of substances chiefly nonmedicinal as to source applies to 1,680 codes
  • code(s):
  • for all associated manifestations of toxic effect, such as: respiratory conditions due to external agents (J60-J70)
  • personal history of foreign body fully removed (Z87.821)
  • to identify any retained foreign body, if applicable (Z18.-)
From Chapter 19 (S00-T88) Injury, poisoning and certain other consequences of external causes applies to 41,187 codes
  • code to identify any retained foreign body, if applicable (Z18.-)

Notes

General instructions on how these codes are used.

From Block T51-T65 Toxic effects of substances chiefly nonmedicinal as to source applies to 1,680 codes
  • When no intent is indicated code to accidental. Undetermined intent is only for use when there is specific documentation in the record that the intent of the toxic effect cannot be determined.
From Chapter 19 (S00-T88) Injury, poisoning and certain other consequences of external causes applies to 41,187 codes
  • Use secondary code(s) from Chapter 20, External causes of morbidity, to indicate cause of injury. Codes within the T section that include the external cause do not require an additional external cause code
  • The chapter uses the S-section for coding different types of injuries related to single body regions and the T-section to cover injuries to unspecified body regions as well as poisoning and certain other consequences of external causes.

7th Character

Every code in the category takes a 7th character from the listed values, with the placeholder X filling any empty positions before it.

From T62 Toxic effect of other noxious substances eaten as food applies to 60 codes
  • The appropriate 7th character is to be added to each code from category T62
Values for category T62 Encounter: Initial, Subsequent, Sequela
  • Ainitial encounter
  • Dsubsequent encounter
  • Ssequela this code

Source: CMS ICD-10-CM Tabular List. How to read instructional notes.

Referenced in Other NotesGuidance

Instructional notes printed at other codes that name T62.0X4S, its category, or a range that includes it.

Excludes2 1

These codes carry an Excludes2 note naming T62.0X4S: its condition is not part of those codes, and both may be reported when the patient has both.

  • T63 Toxic effect of contact with venomous animals and plants
    ingestion of toxic animal or plant (T61.-, T62.-) names T62.-, which includes this code

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

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
Amanita phalloidesT62.0X1T62.0X2T62.0X3T62.0X4––
AmanitineT62.0X1T62.0X2T62.0X3T62.0X4––
Food, foodstuffs, noxious, nonbacterial, NEC::mushroomsT62.0X1T62.0X2T62.0X3T62.0X4––
Fungi, noxious, used as foodT62.0X1T62.0X2T62.0X3T62.0X4––
Mushroom, noxiousT62.0X1T62.0X2T62.0X3T62.0X4––
ToadstoolT62.0X1T62.0X2T62.0X3T62.0X4––

Patient EducationClinical

Poisoning

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:

Read the full article at MedlinePlus

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

Convert T62.0X4S to ICD-9-CMHistory

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

ICD-9-CM
909.1 Late eff nonmed substanc
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
E989 Late eff inj-undet circ
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 2017–2026No changes
FY 2027CurrentCurrent code set, no changesEffective October 1, 2026 through September 30, 2027.

Questions About T62.0X4SOverview

What is the ICD-10 code for toxic effect of ingested mushrooms, undetermined, sequela?

The ICD-10-CM code for toxic effect of ingested mushrooms, undetermined, sequela is T62.0X4S (sometimes written as T620X4S). It is billable on HIPAA-covered claims from October 1, 2026 through September 30, 2027.

Is T62.0X4S (Toxic effect of ingested mushrooms, undetermined) a billable code?

Yes. This is a billable ICD-10-CM code, specific enough to report toxic effect of ingested mushrooms, undetermined, sequela on HIPAA-covered claims from October 1, 2026 through September 30, 2027.

What does the 7th character S in T62.0X4S mean?

The final character S makes this a sequela code: it reports a lingering problem that remains after the toxic effect of ingested mushrooms, undetermined itself has resolved, not the original event.

What MS-DRG does T62.0X4S group to?

When toxic effect of ingested mushrooms, undetermined, sequela is the principal diagnosis on an inpatient stay, it groups to MS-DRG 923, 922, with relative weights from 0.9980 to 1.6248 depending on complications. Higher weights mean higher Medicare reimbursement.

Is T62.0X4S 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 toxic effect of ingested mushrooms, undetermined, sequela on inpatient claims. The code appears in the Toxic effects of substances chiefly nonmedicinal as to source (T51-T65) range of the CMS exempt list.