Skip to main content

P00 vs T43.626D

P00 (Newborn affected by maternal conditions that may be unrelated to present pregnancy) compared with T43.626D (Underdosing of amphetamines, subsequent encounter), from the official CMS tabular data.

Current data releases:ICD-10-CM FY2027 · ICD-10-PCS FY2027 · HCPCS October 2026 · MS-DRG v44 · Medicare Code Editor v44.0 · NCCI PTP Q4 2026 · MUE Q4 2026 · NCD code lists 2026-01 · LCD export September 28, 2026 · All releases and sources

Summary

These codes can be reported together when both conditions are documented, because T43.626D lists P00 under Excludes2, which marks them as distinct conditions.

Official rule
What is different?

The conditions named, billing status and chapter.P00 is “Newborn affected by maternal conditions that may be unrelated to present pregnancy”; T43.626D is “Underdosing of amphetamines, subsequent encounter”. P00 is a non-billable header; T43.626D is billable. P00 sits in P00-P96 — Certain Conditions Originating in the Perinatal Period (P00-P96); T43.626D in S00-T88 — Injury, Poisoning and Certain Other Consequences of External Causes (S00-T88).

Registry fact

Can these codes be reported together?

Yes, when both are documented.T43.626D lists P00 under Excludes2: “drug reaction and poisoning affecting newborn (P00-P96)”. Excludes2 marks distinct conditions that may both be reported when both are documented.

Official ruleGuide: Excludes1 vs Excludes2

Is there an Excludes1 relationship?

None.Neither entry carries an Excludes1 note that names the other code. T43.626D carries 2 Excludes1 notes covering other codes; the side-by-side table quotes them.

Official rule

Is there an Excludes2 relationship?

Yes.T43.626D’s tabular entry: “drug reaction and poisoning affecting newborn (P00-P96)”. The note covers P00.

Official ruleGuide: Excludes1 vs Excludes2

Is one more specific?

Not comparable.The codes sit in different categories; specificity is only comparable within one category.

Is one a parent or header code?

One is a header.P00 is a non-billable header, but T43.626D is not one of its subdivisions.

Registry fact

Are there sequencing instructions?

None.Neither entry carries a Code First or Use Additional Code note that names the other.

Official rule

Are there other coding relationships?

None found.No laterality, encounter-phase, Table of Neoplasms, Table of Drugs and Chemicals, or history-versus-active-disease relationship links these codes.

MedCoder-derived

Official rule: a tabular instructional note or a section of the ICD-10-CM Official Guidelines, quoted as published. Registry fact: the codes’ own published attributes (titles, billable status, position in the hierarchy, code set). MedCoder-derived: a reading MedCoder computes from those facts; it is not itself a rule. How to read the labels

Can these codes be reported together?

Informational

Excludes2 relationship

T43.626D
Underdosing of amphetamines, subsequent encounter
↔
P00
Newborn affected by maternal conditions that may be unrelated to present pregnancy

What we found

Yes, when both are documented.T43.626D carries an Excludes2 note covering P00: “drug reaction and poisoning affecting newborn (P00-P96)”

Excludes2 marks distinct conditions — both may be reported when both are documented.

What to review

Report both only when the documentation supports both conditions; otherwise report the one documented.

Guide: Excludes1 vs Excludes2Check these on a claim

Why it matters

An Excludes2 note means the excluded condition is not part of the code above it, but a patient can have both. Report both when both are documented.

Source / rule

CMS ICD-10-CM tabular instructional notes

Official guidance behind these answers

  • Section I.A.12.b — Excludes2 · applies to: Excludes2

    A type 2 Excludes note represents “Not included here.” An excludes2 note indicates that the condition excluded is not part of the condition represented by the code, but a patient may have both conditions at the same time. When an Excludes2 note appears under a code, it is acceptable to use both the code and the excluded code together, when appropriate.

    ICD-10-CM Official Guidelines FY2027

Quoted from the ICD-10-CM Official Guidelines for Coding and Reporting in effect for the release shown. The tabular notes above are the code-level instruction; these sections are the convention that says how such a note is applied. Source document (CMS PDF) · Release and checksum

Side by side

Similar descriptions do not make codes interchangeable. The documentation and the official instructions decide which code applies.

Official descriptionDiffers
P00

Newborn affected by maternal conditions that may be unrelated to present pregnancy

T43.626D

Underdosing of amphetamines, subsequent encounter

StatusDiffers
P00
Non-billable header

A header is not reported on a claim; a code beneath it is.

Report instead: P00.0, P00.1, P00.2, P00.3, P00.4

T43.626D
Billable
Excludes1Differs
P00

None at this code

T43.626D
  • poisoning by, adverse effect of and underdosing of cocaine (T40.5-)
  • toxic reaction to local anesthesia in pregnancy (O29.3-)
Excludes2Differs
P00
  • encounter for observation of newborn for suspected diseases and conditions ruled out (Z05.-)
  • newborn affected by maternal complications of pregnancy (P01.-)
  • newborn affected by maternal endocrine and metabolic disorders (P70-P74)
  • newborn affected by noxious substances transmitted via placenta or breast milk (P04.-)
T43.626D
  • appetite depressants (T50.5-)
  • barbiturates (T42.3-)
  • benzodiazepines (T42.4-)
  • drug dependence and related mental and behavioral disorders due to psychoactive substance use (F10.- -F19.-)
  • methaqualone (T42.6-)
  • psychodysleptics [hallucinogens] (T40.7-T40.9-)
  • 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)
Code firstDiffers
P00
  • any current condition in newborn
T43.626D
  • , for adverse effects, the nature of the adverse effect, such as:
  • adverse effect NOS (T88.7)
Use additional codeDiffers
P00

None at this code

T43.626D
  • code(s) to specify:
  • manifestations of poisoning
  • underdosing or failure in dosage during medical and surgical care (Y63.6, Y63.8-Y63.9)
CategoryDiffers
P00

Is itself a category

T43.626D

T43 Poisoning by, adverse effect of and underdosing of psychotropic drugs, not elsewhere classified

ChapterDiffers
P00

P00-P96 — Certain Conditions Originating in the Perinatal Period (P00-P96)

T43.626D

S00-T88 — Injury, Poisoning and Certain Other Consequences of External Causes (S00-T88)

IncludesDiffers
P00

None at this code

T43.626D
  • adverse effect of correct substance properly administered
  • poisoning by overdose of substance
  • poisoning by wrong substance given or taken in error
  • underdosing by (inadvertently) (deliberately) taking less substance than prescribed or instructed
7th characterDiffers
P00

None at this code

T43.626D
  • The appropriate 7th character is to be added to each code from category T43

No Code also note at either code.

Notes are the code’s own tabular entry, quoted as published. A note that names the other code is the one the verdict above rests on. In a row that differs, notes every code shares are dimmed.

Edit this comparisonCheck a whole claim

Derived from the official CMS ICD-10-CM tabular data (FY2027). A coding-rule comparison, not billing advice: payer-specific edits and medical-necessity policy are outside its scope. All data sources