2027 ICD-10-CM Diagnosis Code T63.482AToxic effect of venom of other arthropod, intentional self-harm, initial encounter

ICD-10-CM Codes›S00–T88›T51-T65›T63

ICD-10-CM T63.482A
CMSSource: CMS FY 2027 ICD-10-CM dataset · Effective Oct 1, 2026 – Sep 30, 2027

T63.482A is a billable ICD-10-CM diagnosis code for toxic effect of venom of other arthropod, intentional self-harm, 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 2027 (October 1, 2026 through September 30, 2027) and groups to MS-DRG 917 through 918. In AHRQ's Clinical Classifications Software (CCSR), this diagnosis falls under External cause codes: bites; initial encounter; External cause codes: intent of injury, self-harm; and Suicidal ideation/attempt/intentional self-harm.

For Medicare Advantage risk adjustment, T63.482A maps to CMS-HCC Category 155 (Major Depression, Moderate or Severe, without Psychosis) under the V28 model, adding a risk factor of about 0.299 for a community, non-dual, aged beneficiary in payment year 2027.

Code Identity

ICD-10-CM Code
T63.482A
Billable Status
Yes — Valid for Submission
Code Describes
Toxic effect of venom of other arthropod, intentional self-harm, initial encounter
Short Description
Toxic effect of venom of arthropod, self-harm, init
Parent Code
T63.482
Toxic effect of venom of other arthropod, intentional self-harm

Code Classification

ChapterS00–T88Injury, poisoning and certain other consequences of external causes
SectionT51-T65Toxic effects of substances chiefly nonmedicinal as to source
CategoryT63Toxic effect of contact with venomous animals and plants
This CodeT63.482AToxic effect of venom of other arthropod, intentional self-harm, initial encounter

Medicare Risk Adjustment (HCC)Billing

T63.482A maps to a payment category in the CMS-HCC model used to risk-adjust Medicare Advantage payments. Weights are the published community factors for payment year 2027.

CMS-HCC V28 Category (Payment Model)
HCC 155— Major Depression, Moderate or Severe, without Psychosis
Payment HCC · PY 2027 one of 371 ICD-10-CM codes in this category
Risk Adjustment Factor (RAF) Weight
+0.299
community, non-dual, aged · ranges 0.108–0.316 across segments
Hierarchy
Superseded by HCC 151, HCC 152, HCC 153, and HCC 154
a more severe related category takes the payment when both are reported
Prior Model (CMS-HCC V24)
HCC 59
V24 retired V28 pays 100% of MA risk scores since PY 2026
Other CMS Models
PACE (CMS-HCC V22): HCC 58 · ESRD (V21): HCC 58 · ESRD (V24): HCC 59
ESRD V21 weights: 0.091 dialysis, 0.217–0.260 functioning graft · ESRD V24 weights: 0.066 dialysis, 0.129–0.259 functioning graft
Part D (RxHCC)
RxHCC 132 — Depression
also risk-adjusts in the Part D prescription drug model (V08)

Source: CMS Payment Year 2027 risk adjustment mappings and model software. Weights are relative factors, not dollar amounts; a beneficiary's total RAF also includes demographics and interactions. Browse all CMS-HCC categories.

Coding GuidelinesGuidance

The appropriate 7th character is to be added to each code from block Toxic effect of contact with venomous animals and plants (T63). 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 T63.482A: its own notes plus those printed at T63.4, T63, block T51-T65, and Chapter 19. A note printed at a category, block or chapter applies to every code under it.

Includes

Further defines, or gives examples of, the content of the category.

From T63 Toxic effect of contact with venomous animals and plants applies to 456 codes
  • bite or touch of venomous animal
  • pricked or stuck by thorn or leaf

Excludes1

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

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 T63 Toxic effect of contact with venomous animals and plants applies to 456 codes
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 T63.4 Toxic effect of venom of other arthropods applies to 84 codes
  • code, if applicable, for anaphylactic shock (T78.2)
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 T63 Toxic effect of contact with venomous animals and plants applies to 456 codes
  • The appropriate 7th character is to be added to each code from category T63
Values for category T63 Encounter: Initial, Subsequent, Sequela
  • Ainitial encounter this code
  • Dsubsequent encounter
  • Ssequela

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

Referenced in Other NotesGuidance

Instructional notes printed at other codes that name T63.482A, its category, or a range that includes it.

Excludes1 5

These codes carry an Excludes1 note naming T63.482A: they are not reported together with it, unless the two conditions are unrelated.

  • Block T07 Injuries involving multiple body regions
    insect bite or sting, venomous (T63.4) names T63.4, which includes this code
  • Block W50-W64 Exposure to animate mechanical forces
    Toxic effect of contact with venomous animals and plants (T63.-) names T63.-, which includes this code
  • W56 Contact with nonvenomous marine animal
    contact with venomous marine animal (T63.-) names T63.-, which includes this code
  • W57 Bitten or stung by nonvenomous insect and other nonvenomous arthropods
    contact with venomous insects and arthropods (T63.2-, T63.3-, T63.4-) names T63.4-, which includes this code
  • W64 Exposure to other animate mechanical forces
    contact with venomous animal (T63.-) names T63.-, which includes this code

Excludes2 11

These codes carry an Excludes2 note naming T63.482A: its condition is not part of those codes, and both may be reported when the patient has both.

  • Block S00-S09 Injuries to the head
    insect bite or sting, venomous (T63.4) names T63.4, which includes this code
  • Block S10-S19 Injuries to the neck
    insect bite or sting, venomous (T63.4) names T63.4, which includes this code
  • Block S20-S29 Injuries to the thorax
    insect bite or sting, venomous (T63.4) names T63.4, which includes this code
  • Block S30-S39 Injuries to the abdomen, lower back, lumbar spine, pelvis and external genitals
    insect bite or sting, venomous (T63.4) names T63.4, which includes this code
  • Block S40-S49 Injuries to the shoulder and upper arm
    insect bite or sting, venomous (T63.4) names T63.4, which includes this code
  • Block S50-S59 Injuries to the elbow and forearm
    insect bite or sting, venomous (T63.4) names T63.4, which includes this code
  • Block S60-S69 Injuries to the wrist, hand and fingers
    insect bite or sting, venomous (T63.4) names T63.4, which includes this code
  • Block S70-S79 Injuries to the hip and thigh
    venomous insect bite or sting (T63.4-) names T63.4-, which includes this code
  • S71 Open wound of hip and thigh
    bite of venomous animal (T63.-) names T63.-, which includes this code
  • Block S80-S89 Injuries to the knee and lower leg
    insect bite or sting, venomous (T63.4) names T63.4, which includes this code
  • Block S90-S99 Injuries to the ankle and foot
    insect bite or sting, venomous (T63.4) names T63.4, which includes this code

Clinical ClassificationClinical

AHRQ’s CCSR groups this code into broader clinical categories.

CCSR EXT012
External cause codes: bites; initial encounter
Default principal diagnosis: inpatient No · outpatient No
CCSR EXT021
External cause codes: intent of injury, self-harm
Default principal diagnosis: inpatient No · outpatient No
CCSR MBD012
Suicidal ideation/attempt/intentional self-harm
Default principal diagnosis: inpatient Yes · outpatient Yes
CCSR INJ023
Toxic effects, initial encounter
Default principal diagnosis: inpatient No · outpatient No

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
Arthropod (venomous) NECT63.481T63.482T63.483T63.484––
Insect (sting), venomousT63.481T63.482T63.483T63.484––
Venom, venomous (bite) (sting)::arthropod NECT63.481T63.482T63.483T63.484––
Venom, venomous (bite) (sting)::insect NECT63.481T63.482T63.483T63.484––

Patient EducationClinical

Insect Bites and Stings

Most insect bites are harmless, though they sometimes cause discomfort. Bee, wasp, and hornet stings and fire ant bites usually hurt. Mosquito and flea bites usually itch. Insects can also spread diseases. In the United States, some mosquitoes spread West Nile virus.

Read the full article at MedlinePlus

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

Convert T63.482A to ICD-9-CMHistory

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

ICD-9-CM
989.5 Toxic effect venom
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
E950.9 Poison-solid/liquid NEC
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 T63.482AOverview

Is T63.482A a billable code?

Yes. This is a billable ICD-10-CM code, specific enough to report toxic effect of venom of other arthropod, intentional self-harm, initial encounter on HIPAA-covered claims from October 1, 2026 through September 30, 2027.

What does the 7th character A in T63.482A mean?

The final character A marks the initial encounter: use it while the patient is receiving active treatment for toxic effect of venom of other arthropod, intentional self-harm, such as an emergency visit or first evaluation.

What MS-DRG does T63.482A group to?

When toxic effect of venom of other arthropod, intentional self-harm, initial encounter is the principal diagnosis on an inpatient stay, it groups to MS-DRG 918, 917, with relative weights from 0.8716 to 1.5698 depending on complications. Higher weights mean higher Medicare reimbursement.

Can T63.482A be reported with a code from Z77?

Not as a rule. The Excludes1 note at block T51-T65, which applies to T63.482A, lists "contact with and (suspected) exposure to toxic substances (Z77.-)". An Excludes1 note means the excluded code is never reported together with this one; the only exception is when the two conditions are unrelated to each other (Official Guidelines, Section I.A.12.a).

Does T63.482A need an additional code?

When the condition applies, yes. The Use Additional Code note at T63.4, which applies to T63.482A, reads: code, if applicable, for anaphylactic shock (T78.2). The additional code is reported after T63.482A.

What HCC is T63.482A?

T63.482A (toxic effect of venom of other arthropod, intentional self-harm, initial encounter) maps to CMS-HCC Category 155 (Major Depression, Moderate or Severe, without Psychosis), commonly written as HCC 155, in the CMS-HCC V28 model used for Medicare Advantage risk adjustment in payment year 2027. It mapped to HCC 59 under the retired V24 model. It also maps in the PACE (CMS-HCC V22), ESRD (V21), and ESRD (V24) models. In the Part D prescription drug model it maps to RxHCC 132.

Does T63.482A risk-adjust for Medicare Advantage payment?

Yes. When documented and reported on a Medicare Advantage encounter, T63.482A adds a risk adjustment factor of about 0.299 to the beneficiary's RAF score for a community, non-dual, aged enrollee (published V28 weights range from 0.108 to 0.316 depending on the payment segment). A more severe related category (HCC 151, HCC 152, HCC 153, and HCC 154) supersedes it when both are reported. See the full factor table on the HCC 155 category page.