T38.1 — Poisoning by, adverse effect of and underdosing of thyroid hormones and substitutes
Is T38.1 billable?
No — T38.1 is a non-billable header code. T38.1 groups more specific codes and cannot be submitted on a claim. A valid ICD-10-CM code must be reported at the highest level of specificity available in its branch. Select one of the 18 billable codes beneath T38.1.
Billable codes under this header
- T38.1X1APoisoning by thyroid hormones and substitutes, accidental (unintentional), initial encounter
- T38.1X1DPoisoning by thyroid hormones and substitutes, accidental (unintentional), subsequent encounter
- T38.1X1SPoisoning by thyroid hormones and substitutes, accidental (unintentional), sequela
- T38.1X2APoisoning by thyroid hormones and substitutes, intentional self-harm, initial encounter
- T38.1X2DPoisoning by thyroid hormones and substitutes, intentional self-harm, subsequent encounter
- T38.1X2SPoisoning by thyroid hormones and substitutes, intentional self-harm, sequela
- T38.1X3APoisoning by thyroid hormones and substitutes, assault, initial encounter
- T38.1X3DPoisoning by thyroid hormones and substitutes, assault, subsequent encounter
- T38.1X3SPoisoning by thyroid hormones and substitutes, assault, sequela
- T38.1X4APoisoning by thyroid hormones and substitutes, undetermined, initial encounter
- T38.1X4DPoisoning by thyroid hormones and substitutes, undetermined, subsequent encounter
- T38.1X4SPoisoning by thyroid hormones and substitutes, undetermined, sequela
- T38.1X5AAdverse effect of thyroid hormones and substitutes, initial encounter
- T38.1X5DAdverse effect of thyroid hormones and substitutes, subsequent encounter
- T38.1X5SAdverse effect of thyroid hormones and substitutes, sequela
- T38.1X6AUnderdosing of thyroid hormones and substitutes, initial encounter
- T38.1X6DUnderdosing of thyroid hormones and substitutes, subsequent encounter
- T38.1X6SUnderdosing of thyroid hormones and substitutes, sequela
T38.1 at a glance
| Code | T38.1 |
|---|---|
| Description | Poisoning by, adverse effect of and underdosing of thyroid hormones and substitutes |
| Billable | No — header code |
| Code set | ICD-10-CM FY2027 |
| Valid for encounters | October 1, 2026 – September 30, 2027 |
Excludes1 — never code together — inherited from T36-T50
The conditions below can never be reported together with T38.1 on the same claim. An Excludes1 note means the two conditions cannot occur in the same patient, so reporting both is a coding error.
- toxic reaction to local anesthesia in pregnancy (O29.3-)
Excludes1 — never code together — inherited from T38
The conditions below can never be reported together with T38.1 on the same claim. An Excludes1 note means the two conditions cannot occur in the same patient, so reporting both is a coding error.
Code first — inherited from T36-T50
The underlying condition below must be sequenced before T38.1. T38.1 describes a manifestation and cannot be the principal or first-listed diagnosis.
Use additional code — inherited from Chapter 19
Report an additional code alongside T38.1 to fully describe the condition. T38.1 is sequenced first.
- code to identify any retained foreign body, if applicable (Z18.-)
Use additional code — inherited from T36-T50
Report an additional code alongside T38.1 to fully describe the condition. T38.1 is sequenced first.
Excludes2 — not included here — inherited from Chapter 19
The conditions below are not part of T38.1, but a patient may have both at the same time. When documentation supports it, T38.1 and the excluded code may both be reported.
Excludes2 — not included here — inherited from T36-T50
The conditions below are not part of T38.1, but a patient may have both at the same time. When documentation supports it, T38.1 and the excluded code may both be reported.
What codes fall under T38.1? (1)
How long has T38.1 existed?
T38.1 has been in ICD-10-CM since at least FY2016, the earliest fiscal year on record here.
Derived from the official order files for FY2016–FY2026. FY2017 and FY2020 publish no order file, so those years are not covered.
What other codes are in the T38 family? (9)
- T38.0Poisoning by, adverse effect of and underdosing of glucocorticoids and synthetic analoguesnot billable
- T38.2Poisoning by, adverse effect of and underdosing of antithyroid drugsnot billable
- T38.3Poisoning by, adverse effect of and underdosing of insulin and oral hypoglycemic [antidiabetic] drugsnot billable
- T38.4Poisoning by, adverse effect of and underdosing of oral contraceptivesnot billable
- T38.5Poisoning by, adverse effect of and underdosing of other estrogens and progestogensnot billable
- T38.6Poisoning by, adverse effect of and underdosing of antigonadotrophins, antiestrogens, antiandrogens, not elsewhere classifiednot billable
- T38.7Poisoning by, adverse effect of and underdosing of androgens and anabolic congenersnot billable
- T38.8Poisoning by, adverse effect of and underdosing of other and unspecified hormones and synthetic substitutesnot billable
- T38.9Poisoning by, adverse effect of and underdosing of other and unspecified hormone antagonistsnot billable