A18.4 – Tuberculosis of skin and subcutaneous tissue
ICD-10-CM 2027 diagnosis code · Tuberculosis
ICD-10-CM code
A18.4
- Code
A18.4(claims format:A184)- Description
- Tuberculosis of skin and subcutaneous tissue
- Billable
- Yes – valid for HIPAA-covered transactions
- Valid for
- Dates of service October 1, 2026 – September 30, 2027 (FY2027)
- Chapter
- 1. Certain infectious and parasitic diseases (A00-B99)
- Block
- A15-A19 Tuberculosis
- Parent codes
- A18
Notes for A18.4
Applicable to:
- Erythema induratum, tuberculous
- Lupus exedens
- Lupus vulgaris NOS
- Lupus vulgaris of eyelid
- Scrofuloderma
- Tuberculosis of external ear
Notes inherited from parent codes
Instructional notes at a category or block level apply to every code below it.
Block A15-A19
Includes:
- infections due to Mycobacterium tuberculosis and Mycobacterium bovis
Excludes1 (not coded here):
- 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:
- code, if applicable, for associated cachexia (E88.A)
Index terms for A18.4
Entries in the ICD-10-CM alphabetic index that lead to this code:
- Acnitis
- Scrofulide
- Lupus, exedens
- Bazin's disease
- Wart, prosector
- Lupus, vulgaris
- Wart, tuberculous
- Gumma, scrofulous
- Gumma, tuberculous
- Lupus, tuberculous
- Scrofulosus lichen
- Lichen, scrofulosus
- Verruca, tuberculosa
- Verruca, necrogenica
- Tarsitis, tuberculous
- Cellulitis, tuberculous
- Tuberculid, tuberculide
- Paronychia, tuberculous
- Lupus, vulgaris, eyelid
- Lichenoides tuberculosis
- Ulcus, cutis tuberculosum
- Lupus, tuberculous, eyelid
- Scrofuloderma, scrofulodermia
- Erythema, erythematous, tuberculous
- Tuberculosis, tubercular, tuberculous, skin
Related codes in A18
- A18.0 – Tuberculosis of bones and jointsHeader
- A18.1 – Tuberculosis of genitourinary systemHeader
- A18.2 – Tuberculous peripheral lymphadenopathyBillable
- A18.3 – Tuberculosis of intestines, peritoneum and mesenteric glandsHeader
- A18.5 – Tuberculosis of eyeHeader
- A18.6 – Tuberculosis of (inner) (middle) earBillable
- A18.7 – Tuberculosis of adrenal glandsBillable
- A18.8 – Tuberculosis of other specified organsHeader
Frequently asked questions
What is ICD-10 code A18.4?
A18.4 is the ICD-10-CM code for tuberculosis of skin and subcutaneous tissue, in the block A15-A19 (Tuberculosis).
Is A18.4 a billable code?
Yes. A18.4 is a billable/specific code that can be used to indicate a diagnosis for reimbursement purposes.
What category does A18.4 belong to?
It belongs to category A18 – Tuberculosis of other organs.
Source: CDC/NCHS ICD-10-CM FY2027 code files, tabular list and index. Reference only – code assignment must follow the official ICD-10-CM guidelines and documentation in the medical record.