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T38

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

Non-billable headerICD-10-CM

T38 is a non-billable header ICD-10-CM code for poisoning by, adverse effect of and underdosing of hormones and their synthetic substitutes and antagonists, not elsewhere classified. It cannot be billed on its own: choose one of the more specific child codes below. This code also requires a 7th character before it is complete.

This code requires a 7th character

The appropriate 7th character is to be added to each code from category T38

A
initial encounter
D
subsequent encounter
S
sequela

Excludes1: never code together

These conditions cannot occur together. Billing both on the same encounter is a denial.

  • mineralocorticoids and their antagonists (T50.0-)
  • oxytocic hormones (T48.0-)
  • parathyroid hormones and derivatives (T50.9-)

Other codes that can never be billed with T38

Their own Excludes1 notes name this code, so the conflict is not listed above.

  • T48.0Poisoning by, adverse effect of and underdosing of oxytocic drugs
  • T39.4Poisoning by, adverse effect of and underdosing of antirheumatics, not elsewhere classified
  • T45.1Poisoning by, adverse effect of and underdosing of antineoplastic and immunosuppressive drugs
  • T48.6Poisoning by, adverse effect of and underdosing of antiasthmatics, not elsewhere classified

Risk adjustment

No CMS-HCC V28 category: this code does not change a RAF score.

Code history

Unchanged in every release from FY2024 to FY2027.

Code to one of these instead T38

10 child codes. Green means billable.

ICD-10-CMFY2027· effective October 1, 2026

Loaded directly from the CMS/NCHS ICD-10-CM public-domain release: see data sources and our editorial policy. If this page disagrees with the CMS tabular list, this page is wrong. Reference information for professional coders; not medical or billing advice.