2016201720182019202020212022202320242025Billable/Specific Code
- A18.4 is a billable/specific ICD-10-CM code that can be used to indicate a diagnosis for reimbursement purposes.
- The 2024 edition of ICD-10-CM A18.4 became effective on October 1, 2022.
- This is the American ICD-10-CM version of A18.4 – other international versions of ICD-10 A18.4 may differ.
ICD-10-CM A18.4 is grouped within Diagnostic Related Group(s):
- 606 Minor skin disorders with mcc
- 607 Minor skin disorders without mcc
- 974 Hiv with major related condition with mcc
- 975 Hiv with major related condition with cc
- 976 Hiv with major related condition without cc/mcc
Applicable To
- Erythema induratum, tuberculous
- Lupus excedens
- Lupus vulgaris NOS
- Lupus vulgaris of eyelid
- Scrofuloderma
- Tuberculosis of external ear
Type 2 Excludes
- lupus erythematosus (L93.-)
- systemic lupus erythematosus (M32.-)
Code History
- 2016 (effective 10/1/2015): New code (first year of non-draft ICD-10-CM)
- 2016 (effective 10/1/2015): No change
- 2017 (effective 10/1/2016): No change
- 2018 (effective 10/1/2017): No change
- 2019 (effective 10/1/2018): No change
- 2020 (effective 10/1/2019): No change
- 2021 (effective 10/1/2020): No change
- 2022 (effective 10/1/2021): No change
- 2023 (effective 10/1/2022): No change
- 2024 (effective 10/1/2023): No change
- 2025 (effective 10/1/2024): No change
Diagnosis Index entries containing back-references to A18.4:
- tuberculous (primary) > Cellulitis (diffuse) (phlegmonous) (septic) (suppurative) L03.90
- tuberculous > induratum (nontuberculous) L52
- tuberculous > nodosum L52
- tuberculous (primary) > Erythema, erythematous (infectional) (inflammation) L53.9
- scrofulous (tuberculous) > Gumma (syphilitic) A52.79
- tuberculous > Gumma (syphilitic) A52.79
- scrofulosus (primary) (tuberculous) > Lichen L28.0
- exedens > Lupus
- tuberculous > Lupus
- eyelid > tuberculous A18.4
- vulgaris > Lupus
- eyelid > vulgaris A18.4
- tuberculous (primary) > Paronychia
- tuberculous > Tarsitis (eyelid) H01.8
- skin (primary) > abscess (respiratory) A15.9
- cellulitis (primary) > Tuberculosis, tubercular, tuberculous (calcification) (calcified) (caseous) (chromogenic acid-fast bacilli) (degeneration) (fibrocaseous) (fistula) (interstitial) (isolated circumscribed lesions) (necrosis) (parenchymatous) (ulcerative) A15.9
- colliquativa (primary) > Tuberculosis, tubercular, tuberculous (calcification) (calcified) (caseous) (chromogenic acid-fast bacilli) (degeneration) (fibrocaseous) (fistula) (interstitial) (isolated circumscribed lesions) (necrosis) (parenchymatous) (ulcerative) A15.9
- cutis (colliquativa) (primary) > Tuberculosis, tubercular, tuberculous (calcification) (calcified) (caseous) (chromogenic acid-fast bacilli) (degeneration) (fibrocaseous) (fistula) (interstitial) (isolated circumscribed lesions) (necrosis) (parenchymatous) (ulcerative) A15.9
- external (primary) > ear (inner) (middle) A18.6
- skin (primary) > ear (inner) (middle) A18.6
- erythema (induratum) (nodosum) (primary) > Tuberculosis, tubercular, tuberculous (calcification) (calcified) (caseous) (chromogenic acid-fast bacilli) (degeneration) (fibrocaseous) (fistula) (interstitial) (isolated circumscribed lesions) (necrosis) (parenchymatous) (ulcerative) A15.9
- eyelid (primary) (lupus) > Tuberculosis, tubercular, tuberculous (calcification) (calcified) (caseous) (chromogenic acid-fast bacilli) (degeneration) (fibrocaseous) (fistula) (interstitial) (isolated circumscribed lesions) (necrosis) (parenchymatous) (ulcerative) A15.9
- indurativa (primary) > Tuberculosis, tubercular, tuberculous (calcification) (calcified) (caseous) (chromogenic acid-fast bacilli) (degeneration) (fibrocaseous) (fistula) (interstitial) (isolated circumscribed lesions) (necrosis) (parenchymatous) (ulcerative) A15.9
- lichenoides (primary) > Tuberculosis, tubercular, tuberculous (calcification) (calcified) (caseous) (chromogenic acid-fast bacilli) (degeneration) (fibrocaseous) (fistula) (interstitial) (isolated circumscribed lesions) (necrosis) (parenchymatous) (ulcerative) A15.9
- lupus vulgaris > Tuberculosis, tubercular, tuberculous (calcification) (calcified) (caseous) (chromogenic acid-fast bacilli) (degeneration) (fibrocaseous) (fistula) (interstitial) (isolated circumscribed lesions) (necrosis) (parenchymatous) (ulcerative) A15.9
- papulonecrotic (a) (primary) > Tuberculosis, tubercular, tuberculous (calcification) (calcified) (caseous) (chromogenic acid-fast bacilli) (degeneration) (fibrocaseous) (fistula) (interstitial) (isolated circumscribed lesions) (necrosis) (parenchymatous) (ulcerative) A15.9
- paronychia (primary) > Tuberculosis, tubercular, tuberculous (calcification) (calcified) (caseous) (chromogenic acid-fast bacilli) (degeneration) (fibrocaseous) (fistula) (interstitial) (isolated circumscribed lesions) (necrosis) (parenchymatous) (ulcerative) A15.9
- skin (any site) (primary) > Tuberculosis, tubercular, tuberculous (calcification) (calcified) (caseous) (chromogenic acid-fast bacilli) (degeneration) (fibrocaseous) (fistula) (interstitial) (isolated circumscribed lesions) (necrosis) (parenchymatous) (ulcerative) A15.9
- subcutaneous tissue (cellular) (primary) > Tuberculosis, tubercular, tuberculous (calcification) (calcified) (caseous) (chromogenic acid-fast bacilli) (degeneration) (fibrocaseous) (fistula) (interstitial) (isolated circumscribed lesions) (necrosis) (parenchymatous) (ulcerative) A15.9
- subcutis (primary) > Tuberculosis, tubercular, tuberculous (calcification) (calcified) (caseous) (chromogenic acid-fast bacilli) (degeneration) (fibrocaseous) (fistula) (interstitial) (isolated circumscribed lesions) (necrosis) (parenchymatous) (ulcerative) A15.9
- tarsitis > Tuberculosis, tubercular, tuberculous (calcification) (calcified) (caseous) (chromogenic acid-fast bacilli) (degeneration) (fibrocaseous) (fistula) (interstitial) (isolated circumscribed lesions) (necrosis) (parenchymatous) (ulcerative) A15.9
- ulcer (skin) (primary) > Tuberculosis, tubercular, tuberculous (calcification) (calcified) (caseous) (chromogenic acid-fast bacilli) (degeneration) (fibrocaseous) (fistula) (interstitial) (isolated circumscribed lesions) (necrosis) (parenchymatous) (ulcerative) A15.9
- verruca, verrucosa (cutis) (primary) > Tuberculosis, tubercular, tuberculous (calcification) (calcified) (caseous) (chromogenic acid-fast bacilli) (degeneration) (fibrocaseous) (fistula) (interstitial) (isolated circumscribed lesions) (necrosis) (parenchymatous) (ulcerative) A15.9
- tuberculous (primary) > skin (atrophic) (chronic) (neurogenic) (non-healing) (perforating) (pyogenic) (trophic) (tropical) L98.499
- cutis tuberculosum > Ulcus
- necrogenica (primary) (tuberculosa) > Verruca (due to HPV) (filiformis) (simplex) (viral) (vulgaris) B07.9
- tuberculosa (primary) > Verruca (due to HPV) (filiformis) (simplex) (viral) (vulgaris) B07.9
- prosector (tuberculous) > Wart (due to HPV) (filiform) (infectious) (viral) B07.9
- tuberculous > Wart (due to HPV) (filiform) (infectious) (viral) B07.9