ICDcodes.org
FY2027

T37.8X6S — Underdosing of other specified systemic anti-infectives and antiparasitics, sequela

BillableUnspecified

Is T37.8X6S billable?

Yes, but T37.8X6S is an unspecified code. T37.8X6S is a valid, billable ICD-10-CM code for encounters from October 1, 2026 through September 30, 2027. However, T37.8X6S 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 T37.8X6S — the more specific alternatives are listed below.

T37.8X6S at a glance

CodeT37.8X6S
DescriptionUnderdosing of other specified systemic anti-infectives and antiparasitics, sequela
BillableYes
Code setICD-10-CM FY2027
Valid for encountersOctober 1, 2026 – September 30, 2027
7th character "S"sequela

What does the 7th character "S" mean in T37.8X6S?

In T37.8X6S, the 7th character S means sequela. The 7th character is required for T37.8X6S to be a valid, complete code.

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

What Medicare edits apply to T37.8X6S?

The Medicare Code Editor screens inpatient claims before they are grouped. These edits name T37.8X6S directly.

Cannot be a principal diagnosis — MCE edit 9

CMS will reject this code as the principal diagnosis on an inpatient claim. It describes something other than the condition chiefly responsible for the admission.

Which MS-DRGs does T37.8X6S group to?

T37.8X6S sits in MDC 23 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.

  • 949Aftercare with CC/MCCmedical
  • 950Aftercare without CC/MCCmedical

Excludes1 — never code together — inherited from T36-T50

The conditions below can never be reported together with T37.8X6S 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 T37.8X6S 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-)

Excludes1 — never code together — inherited from T37.8

The conditions below can never be reported together with T37.8X6S 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 T37.8X6S. T37.8X6S 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 T37.8X6S to fully describe the condition. T37.8X6S 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 T37.8X6S to fully describe the condition. T37.8X6S 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 T37.8X6S, but a patient may have both at the same time. When documentation supports it, T37.8X6S 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 T37.8X6S, but a patient may have both at the same time. When documentation supports it, T37.8X6S 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 T37.8X6S existed?

T37.8X6S 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.