T46.1X6 Underdosing of calcium-channel blockers

✓ Billable ICD-10-CM 2026
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The ICD-10-CM code for Underdosing of calcium-channel blockers is T46.1X6 (FY2026). It is a billable, claim-ready diagnosis code.

Classification

Section
T36-T50: Poisoning by, adverse effects of and underdosing of drugs, medicaments and biological substances (T36-T50)
Category T46
88 codes (66 billable)
FY2026 Status
Stable since FY2024

Official Coding Guidelines

Sequence blood vessel/nerve injury first (fragment)

injury is to the blood vessels or nerves, that injury should be sequenced first.

— ICD-10-CM Official Guidelines for Coding and Reporting, FY2026, Section I.C.19.b.2
Do not assign injury codes for iatrogenic injuries; code complication

3) Iatrogenic injuries Injury codes from Chapter 19 should not be assigned for injuries that occur during, or as a result of, a medical intervention. Assign the appropriate complication code(s).

— ICD-10-CM Official Guidelines for Coding and Reporting, FY2026, Section I.C.19.b.3

Source: CMS — ICD-10-CM Official Guidelines for Coding and Reporting, FY2026

References

Related Codes

Parent Code

T46 Poisoning by, adverse effect of and underdosing of agents primarily affecting the cardiovascular system

Related Codes in T46

T46 Poisoning by, adverse effect of and underdosing of agents primarily affecting the cardiovascular system T46.0 Poisoning by, adverse effect of and underdosing of cardiac-stimulant glycosides and drugs of similar action T46.0X Poisoning by, adverse effect of and underdosing of cardiac-stimulant glycosides and drugs of similar action T46.0X1 Poisoning by cardiac-stimulant glycosides and drugs of similar action, accidental (unintentional) T46.0X2 Poisoning by cardiac-stimulant glycosides and drugs of similar action, intentional self-harm T46.0X3 Poisoning by cardiac-stimulant glycosides and drugs of similar action, assault T46.0X4 Poisoning by cardiac-stimulant glycosides and drugs of similar action, undetermined T46.0X5 Adverse effect of cardiac-stimulant glycosides and drugs of similar action T46.0X6 Underdosing of cardiac-stimulant glycosides and drugs of similar action T46.1 Poisoning by, adverse effect of and underdosing of calcium-channel blockers T46.1X Poisoning by, adverse effect of and underdosing of calcium-channel blockers T46.1X1 Poisoning by calcium-channel blockers, accidental (unintentional) T46.1X2 Poisoning by calcium-channel blockers, intentional self-harm T46.1X3 Poisoning by calcium-channel blockers, assault T46.1X4 Poisoning by calcium-channel blockers, undetermined T46.1X5 Adverse effect of calcium-channel blockers T46.2 Poisoning by, adverse effect of and underdosing of other antidysrhythmic drugs, not elsewhere classified T46.2X Poisoning by, adverse effect of and underdosing of other antidysrhythmic drugs T46.2X1 Poisoning by other antidysrhythmic drugs, accidental (unintentional) T46.2X2 Poisoning by other antidysrhythmic drugs, intentional self-harm
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Reviewed by Prajwal Shrestha, CPC, CRC
Certified Professional Coder (CPC) and Certified Risk Adjustment Coder (CRC) · AAPC Member ID 01997614 · About · Editorial policy · Content last reviewed: 2025-10-01

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