A18.4

Tuberculosis of skin and subcutaneous tissue

Billable code

This code does not map to a risk-adjusting HCC in the loaded models.

Coding notes

Excludes 1 never coded together · Excludes 2 may co-exist

This code · A18.4
Excludes 2

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

Synonyms

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

Inherited from A15-A19Tuberculosis
Includes

infections due to Mycobacterium tuberculosis and Mycobacterium bovis

Excludes 1

congenital tuberculosis (P37.0) nonspecific reaction to test for tuberculosis without active tuberculosis (R76.1-) pneumoconiosis associated with tuberculosis, any type in A15 (J65) positive PPD (R76.11) positive tuberculin skin test without active tuberculosis (R76.11) sequelae of tuberculosis (B90.-) silicotuberculosis (J65)

Use additional

code, if applicable, for associated cachexia (E88.A)

Inherited from chapter 1Certain infectious and parasitic diseases
Includes

diseases generally recognized as communicable or transmissible

Excludes 1

certain localized infections - see body system-related chapters

Excludes 2

carrier or suspected carrier of infectious disease (Z22.-) infectious and parasitic diseases complicating pregnancy, childbirth and the puerperium (O98.-) infectious and parasitic diseases specific to the perinatal period (P35-P39) influenza and other acute respiratory infections (J00-J22)

Use additional

code to identify resistance to antimicrobial drugs (Z16.-)

Official Guidelines for A18.4

FY 2026 ›
I.C.1Chapter-specific guidanceChapter 1: Certain Infectious and Parasitic Diseases (A00-B99), U07.1, U09.9

Subsections

Sections that reference A18.4

Sections whose FY 2026 text names A18.4, its A18 category, or a range containing it — the chapter guidance above is the authoritative source.

Find A18.4 in the alphabetic index

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