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ICD-10-CM Codes
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A00-B99
Certain infectious and parasitic diseases
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A15-A19
Tuberculosis
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A18-
Tuberculosis of other organs
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2023 ICD-10-CM Diagnosis Code A18.4
2023 ICD-10-CM Diagnosis Code A18.4
Tuberculosis of skin and subcutaneous tissue
2016 2017 2018 2019 2020 2021 2022 2023 Billable/Specific Code
- A18.4 is a billable/specific ICD-10-CM code that can be used to indicate a diagnosis for reimbursement purposes.
- The 2023 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.
Applicable To- Erythema induratum, tuberculous
- Lupus excedens
- Lupus vulgaris NOS
- Lupus vulgaris of eyelid
- Scrofuloderma
- Tuberculosis of external ear
Type 2 ExcludesType 2 Excludes Help
A type 2 excludes note represents "not included here". A type 2 excludes note indicates that the condition excluded is not part of the condition it is excluded from but a patient may have both conditions at the same time. When a type 2 excludes note appears under a code it is acceptable to use both the code (A18.4) and the excluded code together.
The following code(s) above
A18.4 contain annotation back-references
Annotation Back-References
In this context, annotation back-references refer to codes that contain:
- Applicable To annotations, or
- Code Also annotations, or
- Code First annotations, or
- Excludes1 annotations, or
- Excludes2 annotations, or
- Includes annotations, or
- Note annotations, or
- Use Additional annotations
that may be applicable to
A18.4:
- Tuberculosis (tb) of subcutaneous tissue
- Tuberculosis (tb) verrucosa cutis
- Tuberculosis (tb) with erythema nodosum
- Tuberculosis of subcutaneous cellular tissue
- Tuberculosis verrucosa cutis
- Tuberculous erythema nodosum
Clinical Information
- A form of cutaneous tuberculosis. It is seen predominantly in women and typically involves the nasal mucosa; buccal mucosa; and conjunctival mucosa.
- A type of panniculitis characterized histologically by the presence of granulomas, vasculitis, and necrosis. It is traditionally considered to be the tuberculous counterpart of nodular vasculitis, but is now known to occur without tuberculous precedent. It is seen most commonly in adolescent and menopausal women, is initiated or exacerbated by cold weather, and typically presents as one or more recurrent erythrocyanotic nodules or plaques on the calves. The nodules may progress to form indurations, ulcerations, and scars.
ICD-10-CM A18.4 is grouped within Diagnostic Related Group(s) (MS-DRG v40.0):
- 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
Convert A18.4 to ICD-9-CM
Code History
- 2016 (effective 10/1/2015): New code (first year of non-draft ICD-10-CM)
- 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
Code annotations containing back-references to A18.4:
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Type 1 Excludes: L93, L93, L52
ICD-10-CM Diagnosis Code L93
Lupus erythematosus
2016 2017 2018 2019 2020 2021 2022 2023 Non-Billable/Non-Specific Code
Use Additional- code for adverse effect, if applicable, to identify drug (T36-T50 with fifth or sixth character 5)
ICD-10-CM Diagnosis Code L93
Lupus erythematosus
2016 2017 2018 2019 2020 2021 2022 2023 Non-Billable/Non-Specific Code
Use Additional- code for adverse effect, if applicable, to identify drug (T36-T50 with fifth or sixth character 5)
ICD-10-CM Diagnosis Code L52
Erythema nodosum
2016 2017 2018 2019 2020 2021 2022 2023 Billable/Specific Code
Type 1 Excludes- tuberculous erythema nodosum (A18.4)
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Type 2 Excludes: A18.5, A18.6
ICD-10-CM Diagnosis Code A18.5
Tuberculosis of eye
2016 2017 2018 2019 2020 2021 2022 2023 Non-Billable/Non-Specific Code
Type 2 Excludes- lupus vulgaris of eyelid (A18.4)
ICD-10-CM Diagnosis Code A18.6
Tuberculosis of (inner) (middle) ear
2016 2017 2018 2019 2020 2021 2022 2023 Billable/Specific Code
Type 2 Excludes- tuberculosis of external ear (A18.4)
- tuberculous mastoiditis (A18.03)
- Acnitis A18.4 (primary)
- Bazin's disease A18.4 (primary) (tuberculous)
- Cellulitis (diffuse) (phlegmonous) (septic) (suppurative) L03.90
ICD-10-CM Diagnosis Code L03.90
Cellulitis, unspecified
2016 2017 2018 2019 2020 2021 2022 2023 Billable/Specific Code
- tuberculous A18.4 (primary)
- Erythema, erythematous (infectional) (inflammation) L53.9
ICD-10-CM Diagnosis Code L53.9
Erythematous condition, unspecified
2016 2017 2018 2019 2020 2021 2022 2023 Billable/Specific Code
Applicable To- Erythema NOS
- Erythroderma NOS
- induratum (nontuberculous) L52
ICD-10-CM Diagnosis Code L52
Erythema nodosum
2016 2017 2018 2019 2020 2021 2022 2023 Billable/Specific Code
Type 1 Excludes- tuberculous erythema nodosum (A18.4)
- nodosum L52
ICD-10-CM Diagnosis Code L52
Erythema nodosum
2016 2017 2018 2019 2020 2021 2022 2023 Billable/Specific Code
Type 1 Excludes- tuberculous erythema nodosum (A18.4)
- tuberculous A18.4 (primary)
- Gumma (syphilitic) A52.79
ICD-10-CM Diagnosis Code A52.79
Other symptomatic late syphilis
2016 2017 2018 2019 2020 2021 2022 2023 Billable/Specific Code
Applicable To- Late syphilitic leukoderma
- Syphilis of adrenal gland
- Syphilis of pituitary gland
- Syphilis of thyroid gland
- Syphilitic splenomegaly
Type 1 Excludes- syphilitic leukoderma (secondary) (A51.39)
- scrofulous A18.4 (tuberculous)
- tuberculous A18.4
- Lichen L28.0
ICD-10-CM Diagnosis Code L28.0
Lichen simplex chronicus
2016 2017 2018 2019 2020 2021 2022 2023 Billable/Specific Code
Applicable To- Circumscribed neurodermatitis
- Lichen NOS
- scrofulosus A18.4 (primary) (tuberculous)
- Lichenoides tuberculosis A18.4 (primary)
- Lupus
- Paronychia - see also Cellulitis, digit
- tuberculous A18.4 (primary)
- Scrofulide A18.4 (primary) (tuberculous)
- Scrofuloderma, scrofulodermia A18.4 (any site) (primary)
- Scrofulosus lichen A18.4 (primary) (tuberculous)
- Tarsitis (eyelid) H01.8
ICD-10-CM Diagnosis Code H01.8
Other specified inflammations of eyelid
2016 2017 2018 2019 2020 2021 2022 2023 Billable/Specific Code
- Tuberculid, tuberculide A18.4 (indurating, subcutaneous) (lichenoid) (miliary) (papulonecrotic) (primary) (skin)
- Tuberculosis, tubercular, tuberculous (calcification) (calcified) (caseous) (chromogenic acid-fast bacilli) (degeneration) (fibrocaseous) (fistula) (interstitial) (isolated circumscribed lesions) (necrosis) (parenchymatous) (ulcerative) A15.9
ICD-10-CM Diagnosis Code A15.9
Respiratory tuberculosis unspecified
2016 2017 2018 2019 2020 2021 2022 2023 Billable/Specific Code
- abscess (respiratory) A15.9
ICD-10-CM Diagnosis Code A15.9
Respiratory tuberculosis unspecified
2016 2017 2018 2019 2020 2021 2022 2023 Billable/Specific Code
- ear (inner) (middle) A18.6
ICD-10-CM Diagnosis Code A18.6
Tuberculosis of (inner) (middle) ear
2016 2017 2018 2019 2020 2021 2022 2023 Billable/Specific Code
Type 2 Excludes- tuberculosis of external ear (A18.4)
- tuberculous mastoiditis (A18.03)
- external A18.4 (primary)
- skin A18.4 (primary)
- ulcer (skin) (primary) A18.4
- cellulitis A18.4 (primary)
- colliquativa A18.4 (primary)
- cutis A18.4 (colliquativa) (primary)
- erythema A18.4 (induratum) (nodosum) (primary)
- eyelid A18.4 (primary) (lupus)
- indurativa A18.4 (primary)
- lichenoides A18.4 (primary)
- lupus vulgaris A18.4
- papulonecrotic A18.4 (a) (primary)
- paronychia A18.4 (primary)
- skin A18.4 (any site) (primary)
- subcutaneous tissue A18.4 (cellular) (primary)
- subcutis A18.4 (primary)
- tarsitis A18.4
- verruca, verrucosa A18.4 (cutis) (primary)
- Ulcer, ulcerated, ulcerating, ulceration, ulcerative
- skin (atrophic) (chronic) (neurogenic) (non-healing) (perforating) (pyogenic) (trophic) (tropical) L98.499
ICD-10-CM Diagnosis Code L98.499
Non-pressure chronic ulcer of skin of other sites with unspecified severity
2016 2017 2018 2019 2020 2021 2022 2023 Billable/Specific Code
- tuberculous A18.4 (primary)
- Ulcus - see also Ulcer
- Verruca (due to HPV) (filiformis) (simplex) (viral) (vulgaris) B07.9
ICD-10-CM Diagnosis Code B07.9
Viral wart, unspecified
2016 2017 2018 2019 2020 2021 2022 2023 Billable/Specific Code
- necrogenica A18.4 (primary) (tuberculosa)
- tuberculosa A18.4 (primary)
- Wart (due to HPV) (filiform) (infectious) (viral) B07.9
ICD-10-CM Diagnosis Code B07.9
Viral wart, unspecified
2016 2017 2018 2019 2020 2021 2022 2023 Billable/Specific Code
- prosector A18.4 (tuberculous)
- tuberculous A18.4
ICD-10-CM Codes Adjacent To A18.4
A18.14 Tuberculosis of prostate
A18.15 Tuberculosis of other male genital organs
A18.17 Tuberculous female pelvic inflammatory disease
A18.18 Tuberculosis of other female genital organs
A18.2 Tuberculous peripheral lymphadenopathy
A18.3 Tuberculosis of intestines, peritoneum and mesenteric glands
A18.31 Tuberculous peritonitis
A18.39 Retroperitoneal tuberculosis
A18.4
Tuberculosis of skin and subcutaneous tissue
A18.5 Tuberculosis of eye
A18.51 Tuberculous episcleritis
A18.53 Tuberculous chorioretinitis
A18.54 Tuberculous iridocyclitis
A18.59 Other tuberculosis of eye
A18.6 Tuberculosis of (inner) (middle) ear
A18.7 Tuberculosis of adrenal glands
A18.8 Tuberculosis of other specified organs
Reimbursement claims with a date of service on or after October 1, 2015 require the use of ICD-10-CM codes.
