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L23.3 vs T88.0XXD

L23.3 (Allergic contact dermatitis due to drugs in contact with skin) compared with T88.0XXD (Infection following immunization, subsequent encounter), from the official CMS tabular data.

Summary

These codes can be reported together when both conditions are documented, because T88.0XXD lists L23.3 under Excludes2, which marks them as distinct conditions.

Official rule
What is different?

The conditions named and chapter.L23.3 is “Allergic contact dermatitis due to drugs in contact with skin”; T88.0XXD is “Infection following immunization, subsequent encounter”. L23.3 sits in L00-L99 — Diseases of the Skin and Subcutaneous Tissue (L00-L99); T88.0XXD 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.T88.0XXD lists L23.3 under Excludes2: “dermatitis due to drugs and medicaments (L23.3, L24.4, L25.1, L27.0-L27.1)”. 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. L23.3 carries 3 Excludes1 notes covering other codes; the side-by-side table quotes them.

Official rule

Is there an Excludes2 relationship?

Yes.T88.0XXD’s tabular entry: “dermatitis due to drugs and medicaments (L23.3, L24.4, L25.1, L27.0-L27.1)”. The note covers L23.3.

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?

No.Both are billable codes, and neither contains the other.

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

T88.0XXD
Infection following immunization, subsequent encounter
↔
L23.3
Allergic contact dermatitis due to drugs in contact with skin

What we found

Yes, when both are documented.T88.0XXD carries an Excludes2 note covering L23.3: “dermatitis due to drugs and medicaments (L23.3, L24.4, L25.1, L27.0-L27.1)”

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 FY2026

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

L23.3Allergic contact dermatitis due to drugs in contact with skinT88.0XXDInfection following immunization, subsequent encounter
Billing statusBillableBillable
ClassificationL00-L99 — Diseases of the Skin and Subcutaneous Tissue (L00-L99)S00-T88 — Injury, Poisoning and Certain Other Consequences of External Causes (S00-T88)
DefinitionAllergic contact dermatitis due to drugs in contact with skin is a billable ICD-10-CM diagnosis code (L23.3).Infection following immunization, subsequent encounter is a billable ICD-10-CM diagnosis code (T88.0XXD).
7th character—The appropriate 7th character is to be added to each code from category T88
Includes—
Sepsis following immunization
Excludes1
allergy NOS (T78.40)
contact dermatitis NOS (L25.9)
dermatitis NOS (L30.9)
—
Excludes2
dermatitis due to ingested drugs and medicaments (L27.0-L27.1)
dermatitis due to substances taken internally (L27.-)
dermatitis of eyelid (H01.1-)
diaper dermatitis (L22)
eczema of external ear (H60.5-)
irritant contact dermatitis (L24.-)
perioral dermatitis (L71.0)
radiation-related disorders of the skin and subcutaneous tissue (L55-L59)
chronic (childhood) granulomatous disease (D71-)
dermatitis gangrenosa (L08.0)
dermatitis herpetiformis (L13.0)
dry skin dermatitis (L85.3)
factitial dermatitis (L98.1)
stasis dermatitis (I87.2)
complication following infusion, transfusion and therapeutic injection (T80.-)
complication following procedure NEC (T81.-)
complications of anesthesia in labor and delivery (O74.-)
complications of anesthesia in pregnancy (O29.-)
complications of anesthesia in puerperium (O89.-)
complications of devices, implants and grafts (T82-T85)
complications of obstetric surgery and procedure (O75.4)
dermatitis due to drugs and medicaments (L23.3, L24.4, L25.1, L27.0-L27.1)
poisoning and toxic effects of drugs and chemicals (T36-T65 with fifth or sixth character 1-4)
specified complications classified elsewhere
any encounters with medical care for postprocedural conditions in which no complications are present, such as:
artificial opening status (Z93.-)
closure of external stoma (Z43.-)
fitting and adjustment of external prosthetic device (Z44.-)
burns and corrosions from local applications and irradiation (T20-T32)
complications of surgical procedures during pregnancy, childbirth and the puerperium (O00-O9A)
mechanical complication of respirator [ventilator] (J95.850)
poisoning and toxic effects of drugs and chemicals (T36-T65 with fifth or sixth character 1-4 or 6)
postprocedural fever (R50.82)
specified complications classified elsewhere, such as:
cerebrospinal fluid leak from spinal puncture (G97.0)
colostomy malfunction (K94.0-)
disorders of fluid and electrolyte imbalance (E86-E87)
functional disturbances following cardiac surgery (I97.0-I97.1)
intraoperative and postprocedural complications of specified body systems (D78.-, E36.-, E89.-, G97.3-, G97.4, H59.3-, H59.-, H95.2-, H95.3, I97.4-, I97.5, J95.6-, J95.7, K91.6-, L76.-, M96.-, N99.-)
ostomy complications (J95.0-, K94.-, N99.5-)
postgastric surgery syndromes (K91.1)
postlaminectomy syndrome NEC (M96.1)
postmastectomy lymphedema syndrome (I97.2)
postsurgical blind-loop syndrome (K91.2)
ventilator associated pneumonia (J95.851)
Use additional code
code for adverse effect, if applicable, to identify drug (T36-T50 with fifth or sixth character 5)
code for adverse effect, if applicable, to identify drug (T36-T50 with fifth or sixth character 5)
code(s) to identify the specified condition resulting from the complication
code to identify devices involved and details of circumstances (Y62-Y82)

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.

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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