A18.4

A18.4: Tuberculosis of skin and subcutaneous tissue

Billable / specific codeICD-10-CM

A18.4 is a billable, specific ICD-10-CM code for tuberculosis of skin and subcutaneous tissue. It is valid for submission on a claim.

Check A18.4 with the rest of the claim: free scrubber

Excludes2: not included here, but may coexist

The excluded condition is not part of this code, but a patient can have both. You may code both.

lupus erythematosus (L93.-)
systemic lupus erythematosus (M32.-)

Inclusion terms

Alternative wordings a physician may use in the chart for this same code.

Erythema induratum, tuberculous
Lupus exedens
Lupus vulgaris NOS
Lupus vulgaris of eyelid
Scrofuloderma
Tuberculosis of external ear

Other codes that can never be billed with A18.4

Their own Excludes1 notes name this code, so the conflict is not listed above.

L52Erythema nodosum
L93Lupus erythematosus

Risk adjustment

No CMS-HCC V28 category: this code does not change a RAF score.

Medicare coverage

A18.4 is named in 9 Medicare coverage policies: 9 listing it as supporting medical necessity. Which one applies depends on your Medicare contractor.

A56416Billing and Coding: Assays for Vitamins and Metabolic Function
A56841Billing and Coding: Vitamin D; 25 hydroxy, includes fraction(s), if performed
A57484Billing and Coding: Vitamin D Assay Testing
A57718Billing and Coding: Vitamin D Assay Testing

Alphabetic index entries that lead here

Acnitis(primary)
Bazin's disease(primary) (tuberculous)
Lichenoides tuberculosis(primary)
Scrofulide(primary) (tuberculous)
Scrofuloderma, scrofulodermia(any site) (primary)
Scrofulosus lichen(primary) (tuberculous)
Tuberculid, tuberculide(indurating, subcutaneous) (lichenoid) (miliary) (papulonecrotic) (primary) (skin)
Cellulitis›tuberculous(primary)
Erythema, erythematous›tuberculous(primary)
Gumma›scrofulous(tuberculous)
Gumma›tuberculous
Lichen›scrofulosus(primary) (tuberculous)

Code history

Unchanged in every release from FY2024 to FY2027.