A18.4
Billable codeTuberculosis of skin and subcutaneous tissue
The ICD-10 code for tuberculosis of skin and subcutaneous tissue is A18.4.
Clinical notes
Excludes2 (not included here)
An Excludes2 note means the excluded condition is not part of this one, but a patient can have both at the same time — in that case both codes may be reported together.
Also known as
Alternate wording, synonyms, or specific conditions that fall under this code, listed to help confirm you've picked the right one.
- Erythema induratum, tuberculous
- Lupus exedens
- Lupus vulgaris NOS
- Lupus vulgaris of eyelid
- Scrofuloderma
- Tuberculosis of external ear
Documentation support
General coding-documentation guidance — not a substitute for payer-specific requirements or professional coding judgment.
- •As a general rule, code to the highest level of specificity supported by the documentation in the medical record.
Related codes in this category
- A18.0Tuberculosis of bones and jointsnon-billable header
- A18.1Tuberculosis of genitourinary systemnon-billable header
- A18.2Tuberculous peripheral lymphadenopathy
- A18.3Tuberculosis of intestines, peritoneum and mesenteric glandsnon-billable header
- A18.5Tuberculosis of eyenon-billable header
- A18.6Tuberculosis of (inner) (middle) ear
- A18.7Tuberculosis of adrenal glands
- A18.8Tuberculosis of other specified organsnon-billable header
- A18.4Tuberculosis of skin and subcutaneous tissue
ICD-9-CM equivalent
Informational only — GEM mappings are approximate, not guaranteed one-to-one equivalents. Verify before use in billing.
- 01700Approximate match
- 01710Approximate match
- 01701Approximate match
- 01702Approximate match
- 01703Approximate match
- 01704Approximate match
- 01705Approximate match
- 01706Approximate match
- 01711Approximate match
- 01712Approximate match
- 01713Approximate match
- 01714Approximate match
- 01715Approximate match
- 01716Approximate match
Associated MS-DRGs
A18.4 can serve as the principal diagnosis for these Medicare Severity Diagnosis-Related Groups.
Informational only — actual DRG assignment also depends on procedures, complications/comorbidities (CC/MCC), discharge status, and payer-specific rules not reflected here.
- DRG 564Other Musculoskeletal System and Connective Tissue Diagnoses with MCC
- DRG 565Other Musculoskeletal System and Connective Tissue Diagnoses with CC
- DRG 566Other Musculoskeletal System and Connective Tissue Diagnoses without CC/MCC
- DRG 606Minor Skin Disorders with MCC
- DRG 607Minor Skin Disorders without MCC