ICDcodes.org
FY2027

T37.91XA — Poisoning by unspecified systemic anti-infective and antiparasitics, accidental (unintentional), initial encounter

BillableUnspecified

Is T37.91XA billable?

Yes, but T37.91XA is an unspecified code. T37.91XA is a valid, billable ICD-10-CM code for encounters from October 1, 2026 through September 30, 2027. However, T37.91XA is an unspecified or catch-all code. Payers apply additional scrutiny to unspecified codes and many deny them when the medical record supports a more specific option, so check the documentation before selecting T37.91XA — the more specific alternatives are listed below.

T37.91XA at a glance

CodeT37.91XA
DescriptionPoisoning by unspecified systemic anti-infective and antiparasitics, accidental (unintentional), initial encounter
BillableYes
Code setICD-10-CM FY2027
Valid for encountersOctober 1, 2026 – September 30, 2027
7th character "A"initial encounter

What does the 7th character "A" mean in T37.91XA?

In T37.91XA, the 7th character A means initial encounter. The 7th character is required for T37.91XA to be a valid, complete code.

Same condition, different episode of care — switch the 7th character:

Which MS-DRGs does T37.91XA group to?

T37.91XA sits in MDC 21 and helps define the logic of 2 MS-DRGs (version 44, FY2027). Which one a stay actually groups to also depends on procedures and secondary diagnoses.

  • 917Poisoning and Toxic Effects of Drugs with MCCmedical
  • 918Poisoning and Toxic Effects of Drugs without MCCmedical

Inclusion terms

Alternative wording in documentation that is classified to T37.91XA.

  • Poisoning by, adverse effect of and underdosing of systemic anti-infective and antiparasitics NOS

Excludes1 — never code together — inherited from T36-T50

The conditions below can never be reported together with T37.91XA 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 T37

The conditions below can never be reported together with T37.91XA on the same claim. An Excludes1 note means the two conditions cannot occur in the same patient, so reporting both is a coding error.

  • anti-infectives topically used for ear, nose and throat (T49.6-)
  • anti-infectives topically used for eye (T49.5-)
  • locally applied anti-infectives NEC (T49.0-)

Code first — inherited from T36-T50

The underlying condition below must be sequenced before T37.91XA. T37.91XA describes a manifestation and cannot be the principal or first-listed diagnosis.

  • , for adverse effects, the nature of the adverse effect, such as:
  • adverse effect NOS (T88.7)
  • aspirin gastritis (K29.-)
  • blood disorders (D56-D76)
  • contact dermatitis (L23-L25)
  • dermatitis due to substances taken internally (L27.-)
  • nephropathy (N14.0-N14.2)

Use additional code — inherited from Chapter 19

Report an additional code alongside T37.91XA to fully describe the condition. T37.91XA 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 T37.91XA to fully describe the condition. T37.91XA is sequenced first.

  • code(s) to specify:
  • manifestations of poisoning
  • underdosing or failure in dosage during medical and surgical care (Y63.6, Y63.8-Y63.9)
  • underdosing of medication regimen (Z91.12-, Z91.13-)

Excludes2 — not included here — inherited from Chapter 19

The conditions below are not part of T37.91XA, but a patient may have both at the same time. When documentation supports it, T37.91XA and the excluded code may both be reported.

  • birth trauma (P10-P15)
  • obstetric trauma (O70-O71)

Excludes2 — not included here — inherited from T36-T50

The conditions below are not part of T37.91XA, but a patient may have both at the same time. When documentation supports it, T37.91XA and the excluded code may both be reported.

  • abuse and dependence of psychoactive substances (F10-F19)
  • abuse of non-dependence-producing substances (F55.-)
  • immunodeficiency due to drugs (D84.821)
  • drug reaction and poisoning affecting newborn (P00-P96)
  • pathological drug intoxication (inebriation) (F10-F19)

How long has T37.91XA existed?

T37.91XA 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.