ICDcodes.org
FY2027

T46.906S — Underdosing of unspecified agents primarily affecting the cardiovascular system, sequela

BillableUnspecified

Is T46.906S billable?

Yes, but T46.906S is an unspecified code. T46.906S is a valid, billable ICD-10-CM code for encounters from October 1, 2026 through September 30, 2027. However, T46.906S 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 T46.906S — the more specific alternatives are listed below.

T46.906S at a glance

CodeT46.906S
DescriptionUnderdosing of unspecified agents primarily affecting the cardiovascular system, 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 T46.906S?

In T46.906S, the 7th character S means sequela. The 7th character is required for T46.906S to be a valid, complete code.

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

What Medicare edits apply to T46.906S?

The Medicare Code Editor screens inpatient claims before they are grouped. These edits name T46.906S 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 T46.906S group to?

T46.906S 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 T46.906S 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 T46

The conditions below can never be reported together with T46.906S on the same claim. An Excludes1 note means the two conditions cannot occur in the same patient, so reporting both is a coding error.

  • poisoning by, adverse effect of and underdosing of metaraminol (T44.4)

Code first — inherited from T36-T50

The underlying condition below must be sequenced before T46.906S. T46.906S 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 T46.906S to fully describe the condition. T46.906S 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 T46.906S to fully describe the condition. T46.906S 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 T46.906S, but a patient may have both at the same time. When documentation supports it, T46.906S 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 T46.906S, but a patient may have both at the same time. When documentation supports it, T46.906S 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 T46.906S existed?

T46.906S 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.