T46.996A — Underdosing of other agents primarily affecting the cardiovascular system, initial encounter
Is T46.996A billable?
Yes — T46.996A is billable for FY2027. T46.996A is a valid, billable ICD-10-CM code at the highest level of specificity in its branch. T46.996A may be submitted for encounters from October 1, 2026 through September 30, 2027.
T46.996A at a glance
| Code | T46.996A |
|---|---|
| Description | Underdosing of other agents primarily affecting the cardiovascular system, initial encounter |
| Billable | Yes |
| Code set | ICD-10-CM FY2027 |
| Valid for encounters | October 1, 2026 – September 30, 2027 |
| 7th character "A" | initial encounter |
What does the 7th character "A" mean in T46.996A?
In T46.996A, the 7th character A means initial encounter. The 7th character is required for T46.996A to be a valid, complete code.
Same condition, different episode of care — switch the 7th character:
What Medicare edits apply to T46.996A?
The Medicare Code Editor screens inpatient claims before they are grouped. These edits name T46.996A directly.
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 T46.996A group to?
T46.996A sits in MDC 23 and helps define the logic of 1 MS-DRG (version 44, FY2027). Which one a stay actually groups to also depends on procedures and secondary diagnoses.
- 951Other Factors Influencing Health Statusmedical
Excludes1 — never code together — inherited from T36-T50
The conditions below can never be reported together with T46.996A 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 T46.996A 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 T46.996A. T46.996A describes a manifestation and cannot be the principal or first-listed diagnosis.
Use additional code — inherited from Chapter 19
Report an additional code alongside T46.996A to fully describe the condition. T46.996A 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 T46.996A to fully describe the condition. T46.996A is sequenced first.
Excludes2 — not included here — inherited from Chapter 19
The conditions below are not part of T46.996A, but a patient may have both at the same time. When documentation supports it, T46.996A and the excluded code may both be reported.
Excludes2 — not included here — inherited from T36-T50
The conditions below are not part of T46.996A, but a patient may have both at the same time. When documentation supports it, T46.996A and the excluded code may both be reported.
How long has T46.996A existed?
T46.996A 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.