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L23.8 ICD-10-CM Code: Allergic contact dermatitis due to other agents

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Billing Status: NO. This is a non-billable ICD-10-CM code: report a more specific billable code beneath it.

Coding at a Glance

Tabular directives
3 Excludes1 · 13 Excludes2

Not billable · FY2027A non-billable heading in the tabular list: report a more specific code beneath it.

What you need to know

Source: CMS/NCHS Official ICD-10-CM tabular notes, quoted. From the CMS/NCHS tabular list for the release in force. A note the category or block publishes applies to this code too; the Instructions section marks which is which.

Excludes1Never report with this code
Excludes2Not included here; may be reported together
  • dermatitis due to substances taken internally (L27.-)
  • dermatitis of eyelid (H01.1-)
  • diaper dermatitis (L22)
  • eczema of external ear (H60.5-)

+9 more in Instructions

Most relevant related codes MedCoder-derived

Read off the official notes above and this code’s own position in the tabular list. Which to report is a documentation question; Compare shows the two side by side.

CompareCheck ClaimView Related Codes

Coding instructions

Official Tabular Instructional Notes: the inclusion, exclusion and sequencing notes published for L23.8 in the official ICD-10-CM tabular list, quoted as published.

Source: CMS/CDC — ICD-10-CM Tabular ListRelease: FY2027Effective: October 1, 2026

Trace:FY2027 changesChange historyRelease, file and checksum

Notes without a marker are published on L23.8 itself; “inherited from” names the category or block whose note applies here.

Excludes1 — Not Coded Here

Conditions generally not reported together with this code (Excludes1) -- an error unless the two conditions are documented as unrelated to each other (ICD-10-CM Official Guidelines, Section I.A.12.a).

Source: inherited from L23

Excludes2 — Not Included Here

Conditions not covered by this code, but which may be reported alongside it when both are present.

Coder workflow for L23.8

MedCoder structured workflow — derived from this code’s own official record

Before you code L23.8

  1. L23.8 is not reportable as written. Select the more specific code beneath it that the documentation supports. Codes are reported to the highest level of specificity the classification provides (Guidelines I.B.2).

    ReviewL23.81, L23.89

    See the relationships section · Guide: How to choose an ICD-10-CM code →

  2. L23.8’s title joins a condition with an associated condition or complication. Confirm each component is documented. Where the classification presumes the link through the “with” convention, only a provider statement that the conditions are unrelated defeats it. A combination code is assigned only when it fully identifies the documented conditions; a required second code for the stage, type or manifestation is still reported when the notes ask for it (Guidelines I.B.9, I.A.15).

    Guide: Combination codes →

  3. Check the Excludes1 note: if the documentation supports a condition named there, do not simply proceed with L23.8. Excludes1 conditions are not reported together with this code unless the record shows they are unrelated (Guidelines I.A.12.a).

    See the official tabular notes

Choose the right path

  1. Does the documentation support one of the more specific codes beneath L23.8?
    Yes → Select that code and continue the checks below on its own page.
    No → L23.8 cannot be reported as written; query for the specificity its subcategory needs.

    ReviewL23.81, L23.89

  2. Does the documentation support a condition named in L23.8’s Excludes1 note?
    Yes → Do not simply proceed: review the excluded code. Both are reported only when the record shows the two conditions are unrelated.
    No → Continue.

    ReviewT78.40, L25.9, L30.9

Consider L23.8. Then confirm the code is valid for the date of service in the Verify section.

Documentation check

The provider’s diagnostic statement
Codes are assigned from the provider’s documented diagnosis, not from clinical criteria, test values or a medication list (Guidelines I.A.19).
The associated condition or complication
Whether the associated condition the title names is documented; the “with” convention presumes some links, and a provider statement that the conditions are unrelated defeats it (Guidelines I.A.15).

Official instructions as workflow

  • Excludes1 — check before selecting L23.8(3 notes)

    Coding workflow: If the documentation supports a condition named in this note, do not simply proceed with L23.8: the two are not reported together. The one exception is when the record shows the two conditions are unrelated to each other.

    CompareT78.40, L25.9, L30.9

    See the official tabular notes · Guidelines I.A.12.a

  • Excludes2 — not part of L23.8(13 notes)

    Coding workflow: The conditions named in this note are not included in L23.8. When the record documents both, both may be reported; the note is a boundary, not a prohibition.

    CompareL27, H01.1, L22, H60.5, L24, L71.0

    See the official tabular notes · Guidelines I.A.12.b

Coding decision scenarios

Pattern scenarios for this code’s structure — decision rules, not clinical cases

Documentation: Both the condition L23.8 describes and a condition named in its Excludes1 note are documented for the same encounter.

Coding question: Can both codes be reported?

Path: Review the Excludes1 note and the excluded code, and look for a provider statement on whether the two conditions are related.

Reason: Excludes1 means the two are not coded together; the exception is when the record shows the conditions are unrelated to each other (Guidelines I.A.12.a).

ReviewT78.40, L25.9, L30.9

Documentation: Only one of the components this code’s title joins is documented.

Coding question: Is L23.8 supported?

Path: Review the code for the documented component on its own.

Reason: A combination code is assigned only when it fully identifies the documented conditions; otherwise the documented component takes its own code (Guidelines I.B.9).

Every row is derived from this code’s own record — its title, tabular notes, 7th-character family and same-category siblings — with fixed MedCoder wording; nothing is inferred about a patient. The official notes and guideline text are in the sections each row links to, and they control.

Don’t confuse L23.8 with…

MedCoder analysis — pairs from this code’s official notes, distinctions written by MedCoder

The codes most likely to be picked instead of L23.8 — named in its own official notes, or sharing its laterality or encounter family — with what separates them and which documentation moves the case. Each links to the full comparison.

  • T78.40— Excludes1 conflict (Excludes1 — generally not reported together)

    Not coded here — the tabular list excludes this pair for the same encounter.

    Not reported together with this code, except where the two conditions are documented as unrelated.

    What moves you there: Documentation of allergy NOS moves the case to T78.40; the two are not reported together unless documented as unrelated.

    Full comparison: L23.8 vs T78.40 →

  • L25.9— Excludes1 conflict (Excludes1 — generally not reported together)

    Not coded here — the tabular list excludes this pair for the same encounter.

    Not reported together with this code, except where the two conditions are documented as unrelated.

    What moves you there: Documentation of contact dermatitis NOS moves the case to L25.9; the two are not reported together unless documented as unrelated.

    Full comparison: L23.8 vs L25.9 →

  • L30.9— Excludes1 conflict (Excludes1 — generally not reported together)

    Not coded here — the tabular list excludes this pair for the same encounter.

    Not reported together with this code, except where the two conditions are documented as unrelated.

    What moves you there: Documentation of dermatitis NOS moves the case to L30.9; the two are not reported together unless documented as unrelated.

    Full comparison: L23.8 vs L30.9 →

  • L23.9— Specificity relationship (Review)

    Overlapping diagnoses in the same category.

    Overlapping codes in the same category — the documentation decides which is the more specific fit.

    What moves you there: A record that documents no more than “Allergic contact dermatitis, unspecified cause” takes L23.9; specificity in the record moves it back here.

    Full comparison: L23.8 vs L23.9 →

  • L27— Excludes2 relationship (Informational)

    Distinct conditions — both may be reported.

    A distinct condition — both may be reported when both are documented.

    What moves you there: Documentation of dermatitis due to substances taken internally adds L27; it is not part of this code and both may be reported when both are documented.

    Full comparison: L23.8 vs L27 →

  • H01.1— Excludes2 relationship (Informational)

    Distinct conditions — both may be reported.

    A distinct condition — both may be reported when both are documented.

    What moves you there: Documentation of dermatitis of eyelid adds H01.1; it is not part of this code and both may be reported when both are documented.

    Full comparison: L23.8 vs H01.1 →

Relationships are read from this code's own official notes, its laterality siblings and its encounter family; the wording of each distinction is MedCoder editorial, and the documentation named in each “what moves you there” line is the official note phrase or sibling title itself. Source: CMS ICD-10-CM tabular instructional notes; ICD-10-CM Official Guidelines, Section I.A.12.a.

Coding context

Guidelines, coding notes, decision aids, relationships (with MS-DRG and CCSR classification), hierarchy, HCC, coverage and the context map: what a coder reaches for after the core. Each section names whether it is official source data, a MedCoder-derived relationship or MedCoder editorial.

Code Overview

Allergic contact dermatitis due to other agents is a non-billable ICD-10-CM category code (L23.8). A more specific billable subcode must be selected for claims submission.

MedCoder summary Summary composed by MedCoder from this code's official ICD-10-CM record. The tabular instructional notes themselves appear verbatim below.

Verify Before Coding

  • Not billable as written — a more specific code is required: L23.81, L23.89.

From the code registry, the Medicare Code Editor, and the MS-DRG Definitions Manual. Check it against a full claim in Claim Check.

Relationships & Classification

MedCoder-derived relationships — computed from published CMS and AHRQ datasets

Other codes that name L23.8 or its code family, from the CMS ICD-10-CM tabular instructional notes. Tabular-note edges are stored at the code family level that carries each note.

Referenced by 4 Excludes1 notes across 2 chapters: L25 — Unspecified contact dermatitis (via L23.-), L50 — Urticaria (via L23.-), L53 — Other erythematous conditions (via L23.-), T78.4 — Other and unspecified allergy (via L23.-).

These codes’ tabular lists mark this diagnosis as mutually exclusive — not reported together unless the conditions are documented as unrelated.

Referenced by 3 Excludes2 notes: L24 — Irritant contact dermatitis (via L23.-), L27 — Dermatitis due to substances taken internally (via L23.-), L30 — Other and unspecified dermatitis (via L23.-).

These codes’ tabular lists name this diagnosis as distinct — both may be reported when both are documented.

Referenced by 22 Code First instructions across 2 chapters: F54 — Psychological and behavioral factors associated with disorders or diseases classified elsewhere (via L23.-), T36 — Poisoning by, adverse effect of and underdosing of systemic antibiotics (via L23.-), T36-T39 — Antibiotics & Anti-infectives (T36-T39) (via L23.-), T36-T50 — Poisoning by, adverse effects of and underdosing of drugs, medicaments and biological substances (T36-T50) (via L23.-), T37 — Poisoning by, adverse effect of and underdosing of other systemic anti-infectives and antiparasitics (via L23.-), T38 — Poisoning by, adverse effect of and underdosing of hormones and their synthetic substitutes and antagonists, not elsewhere classified (via L23.-), T39 — Poisoning by, adverse effect of and underdosing of nonopioid analgesics, antipyretics and antirheumatics (via L23.-), T40 — Poisoning by, adverse effect of and underdosing of narcotics and psychodysleptics [hallucinogens] (via L23.-), T40-T41 — Analgesics & Antipyretics (T40-T41) (via L23.-), T41 — Poisoning by, adverse effect of and underdosing of anesthetics and therapeutic gases (via L23.-), T42 — Poisoning by, adverse effect of and underdosing of antiepileptic, sedative- hypnotic and antiparkinsonism drugs (via L23.-), T42-T43 — Anticonvulsants & Psychotropics (T42-T43) (via L23.-), T43 — Poisoning by, adverse effect of and underdosing of psychotropic drugs, not elsewhere classified (via L23.-), T44 — Poisoning by, adverse effect of and underdosing of drugs primarily affecting the autonomic nervous system (via L23.-), T44-T46 — Cardiovascular & Gastrointestinal (T44-T46) (via L23.-), T45 — Poisoning by, adverse effect of and underdosing of primarily systemic and hematological agents, not elsewhere classified (via L23.-), T46 — Poisoning by, adverse effect of and underdosing of agents primarily affecting the cardiovascular system (via L23.-), T47 — Poisoning by, adverse effect of and underdosing of agents primarily affecting the gastrointestinal system (via L23.-), T47-T50 — Hormones & Systemic Agents (T47-T50) (via L23.-), T48 — Poisoning by, adverse effect of and underdosing of agents primarily acting on smooth and skeletal muscles and the respiratory system (via L23.-), +2 more.

Each of these codes carries a Code First note naming this condition — when that code is reported, THIS code is sequenced first, ahead of it.

Contextual Map

Every relationship of L23.8 in one view: hierarchy, official tabular instructions in both directions, clinical classification, risk adjustment, MS-DRG participation, index terms and change history — each edge carrying the CMS source it derives from.

Run L23.8 with these 15 related codes in Claim Check

Hierarchy

Referenced by Excludes1 notes

  • L25 — Unspecified contact dermatitis[Excludes1](via L23.-): “allergic contact dermatitis (L23.-)”— CMS ICD-10-CM tabular instructional notes · icd10cm-fy2027
  • L50 — Urticaria[Excludes1](via L23.-): “allergic contact dermatitis (L23.-)”— CMS ICD-10-CM tabular instructional notes · icd10cm-fy2027
  • L53 — Other erythematous conditions[Excludes1](via L23.-): “erythema due to external agents in contact with skin (L23-L25)”— CMS ICD-10-CM tabular instructional notes · icd10cm-fy2027
  • T78.4 — Other and unspecified allergy[Excludes1](via L23.-): “dermatitis (L23-L25, L27.-)”— CMS ICD-10-CM tabular instructional notes · icd10cm-fy2027

Referenced by Excludes2 notes

Referenced by Code First instructions (22)

Nearest codes (12)

Change history

  • FY2016 — In the code set at ICD-10-CM adoption [Change history]— CMS release files (code change ledger) · icd10cm-fy2016

Reference

Index terms and tables, published questions and FAQ, every source behind this page with its release and checksum, the date-of-service check and the complete change history.

Common coding questions

MedCoder editorial

Can L23.8 be billed directly?

No. L23.8 (Allergic contact dermatitis due to other agents) is a non-billable ICD-10-CM category code. A more specific billable subcode must be selected based on clinical documentation.

Sources for this page

Codes, titles, notes, index terms and mappings on this page are transcribed from the datasets below. Relationships MedCoder computed and text MedCoder wrote are labelled where they appear.

Code, title, tabular notes and index terms Official source data
CMS/CDC ICD-10-CM FY2027 tabular list, index and tables, effective October 1, 2026 Release, file and checksum · Publisher’s page
Claim edits Official source data
CMS Definitions of Medicare Code Edits — v44.0 (October 2026) Release, file and checksum · Publisher’s page
Change history and date-of-service validity Official source data
CMS ICD-10-CM release addenda, ingested release by release into the change ledger Release, file and checksum · Publisher’s page
Comparisons, relationships and the contextual map MedCoder-derived relationship
Computed by MedCoder from the tabular notes and tables above; every derived relationship is marked as derived where it appears
Summary and FAQ answers MedCoder editorial explanation
Written by MedCoder to explain the sources above: drafted with AI assistance, checked by a person against the release files, and labelled as MedCoder text where it appears. Not official text.

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 20, 2026 · All releases and sources

Labels on this page: Official source data · MedCoder-derived relationship · MedCoder editorial explanation. How to read the labels · All data sources and release dates · CMS coding rules

Cite this page

Reference this page in a research guide, syllabus or article. The release is included because code content changes each year.

MedCoder.ai. "L23.8 — Allergic contact dermatitis due to other agents." ICD-10-CM FY2027. https://medcoder.ai/icd10/code/l23.8-allergic-contact-dermatitis-due-to-other-agents

Change history

  • FY2016 — October 1, 2015
    In the code set at ICD-10-CM adoption
    Allergic contact dermatitis due to other agents

No changes since FY2016 — additions, deletions, description changes and billable-status changes are tracked through FY2027, and none are recorded for this code. Note changes are tracked from FY2027 only.

Nearest Codes in This Family

Official ICD-10-CM classifications closest to L23.8 in its code family, with their registry titles.

View all codes in the L23 family