T38.3X6 Underdosing of insulin and oral hypoglycemic [antidiabetic] drugs

✓ Billable ICD-10-CM 2026
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The ICD-10-CM code for Underdosing of insulin and oral hypoglycemic [antidiabetic] drugs is T38.3X6 (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 T38
102 codes (78 billable)
FY2026 Status
Stable since FY2024

Official Coding Guidelines

Insulin pump failure—underdosing sequencing and add'l codes

complication of other specified internal and external prosthetic devices, implants and grafts, that specifies the type of pump malfunction, as the principal or first-listed code, followed by code T38.3X6-, Underdosing of insulin and oral hypoglycemic [antidiabetic] drugs. Additional codes for the type of diabetes mellitus and any associated complications due to the underdosing should also be assigned.

— ICD-10-CM Official Guidelines for Coding and Reporting, FY2026, Section I.C.4.a.5.a
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

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

References

Related Codes

Parent Code

T38 Poisoning by, adverse effect of and underdosing of hormones and their synthetic substitutes and antagonists, not elsewhere classified

Related Codes in T38

T38 Poisoning by, adverse effect of and underdosing of hormones and their synthetic substitutes and antagonists, not elsewhere classified T38.0 Poisoning by, adverse effect of and underdosing of glucocorticoids and synthetic analogues T38.0X Poisoning by, adverse effect of and underdosing of glucocorticoids and synthetic analogues T38.0X1 Poisoning by glucocorticoids and synthetic analogues, accidental (unintentional) T38.0X2 Poisoning by glucocorticoids and synthetic analogues, intentional self-harm T38.0X3 Poisoning by glucocorticoids and synthetic analogues, assault T38.0X4 Poisoning by glucocorticoids and synthetic analogues, undetermined T38.0X5 Adverse effect of glucocorticoids and synthetic analogues T38.0X6 Underdosing of glucocorticoids and synthetic analogues T38.1 Poisoning by, adverse effect of and underdosing of thyroid hormones and substitutes T38.1X Poisoning by, adverse effect of and underdosing of thyroid hormones and substitutes T38.1X1 Poisoning by thyroid hormones and substitutes, accidental (unintentional) T38.1X2 Poisoning by thyroid hormones and substitutes, intentional self-harm T38.1X3 Poisoning by thyroid hormones and substitutes, assault T38.1X4 Poisoning by thyroid hormones and substitutes, undetermined T38.1X5 Adverse effect of thyroid hormones and substitutes T38.1X6 Underdosing of thyroid hormones and substitutes T38.2 Poisoning by, adverse effect of and underdosing of antithyroid drugs T38.2X Poisoning by, adverse effect of and underdosing of antithyroid drugs T38.2X1 Poisoning by antithyroid drugs, accidental (unintentional)
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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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