ICDcodes.org
FY2027

L23.9 — Allergic contact dermatitis, unspecified cause

BillableUnspecified

Is L23.9 billable?

Yes, but L23.9 is an unspecified code. L23.9 is a valid, billable ICD-10-CM code for encounters from October 1, 2026 through September 30, 2027. However, L23.9 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 L23.9 — the more specific alternatives are listed below.

L23.9 at a glance

CodeL23.9
DescriptionAllergic contact dermatitis, unspecified cause
BillableYes
Code setICD-10-CM FY2027
Valid for encountersOctober 1, 2026 – September 30, 2027

Which MS-DRGs does L23.9 group to?

L23.9 sits in MDC 09 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.

  • 606Minor Skin Disorders with MCCmedical
  • 607Minor Skin Disorders without MCCmedical

How is L23.9 listed in the Alphabetic Index?

These are the routes through the Alphabetic Index that lead to L23.9. They show the wording a clinician may have documented, which often differs from the Tabular description.

  • Dermatitis › sensitization NOS (eczematous)
  • Dermatitis › contact › allergic (eczematous)

Inclusion terms

Alternative wording in documentation that is classified to L23.9.

  • Allergic contact eczema NOS

Excludes1 — never code together — inherited from L23

The conditions below can never be reported together with L23.9 on the same claim. An Excludes1 note means the two conditions cannot occur in the same patient, so reporting both is a coding error.

Excludes2 — not included here — inherited from Chapter 12

The conditions below are not part of L23.9, but a patient may have both at the same time. When documentation supports it, L23.9 and the excluded code may both be reported.

  • certain conditions originating in the perinatal period (P04-P96)
  • certain infectious and parasitic diseases (A00-B99)
  • complications of pregnancy, childbirth and the puerperium (O00-O9A)
  • congenital malformations, deformations, and chromosomal abnormalities (Q00-Q99)
  • endocrine, nutritional and metabolic diseases (E00-E88)
  • lipomelanotic reticulosis (I89.8)
  • neoplasms (C00-D49)
  • symptoms, signs and abnormal clinical and laboratory findings, not elsewhere classified (R00-R94)
  • systemic connective tissue disorders (M30-M36)
  • viral warts (B07.-)

Excludes2 — not included here — inherited from L20-L30

The conditions below are not part of L23.9, but a patient may have both at the same time. When documentation supports it, L23.9 and the excluded code may both be reported.

  • chronic (childhood) granulomatous disease (D71-)
  • dermatitis gangrenosa (L08.0)
  • dermatitis herpetiformis (L13.0)
  • dry skin dermatitis (L85.3)
  • factitial dermatitis (L98.1)
  • perioral dermatitis (L71.0)
  • radiation-related disorders of the skin and subcutaneous tissue (L55-L59)
  • stasis dermatitis (I87.2)

Excludes2 — not included here — inherited from L23

The conditions below are not part of L23.9, but a patient may have both at the same time. When documentation supports it, L23.9 and the excluded code may both be reported.

  • 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)

How long has L23.9 existed?

L23.9 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.

Which conditions are coded to L23.9?

What other codes are in the L23 family? (9)