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  2. ICD-10-CM Codes List
  3. A00–B99
  4. A15-A19
  5. Tuberculosis of other organs (A18)

Tuberculosis of other organs (A18)

ICD-10 code section A18 covers tuberculosis of other organs, encompassing tuberculosis infections that affect body parts beyond the lungs. This section’s codes are used to specifically identify and document tuberculosis involvement in bones, joints, genitourinary system, lymph nodes, intestines, skin, eyes, ears, adrenal glands, endocrine organs, digestive tract, heart, spleen, and other less common sites.

The ICD-10 code for tuberculosis of bones and joints (A18.0–A18.09) includes detailed subcodes such as tuberculous spinal infections (A18.01, also known as Pott’s disease), joint tuberculosis (A18.02), and tuberculosis of other bones (A18.03). Codes like A18.1 represent tuberculosis of the genitourinary system; including kidney, ureter, bladder, prostate, and reproductive organs; often referred to as genital or urinary tuberculosis. Tuberculous peripheral lymphadenopathy (A18.2) accounts for infections in lymph nodes, sometimes called scrofula. Tuberculosis affecting the intestines, peritoneum, and mesenteric glands (A18.3) includes tuberculous enteritis and peritonitis. Also notable are codes for tuberculosis of the skin (A18.4) with synonyms like lupus vulgaris, and tuberculosis of the eye (A18.5) covering forms such as keratitis and iridocyclitis. The section comprehensively accounts for extrapulmonary tuberculosis manifestations, providing specific codes to guide precise coding of infections caused by Mycobacterium tuberculosis in various organs throughout the body.

  • Certain infectious and parasitic diseases (A00–B99)

    • Tuberculosis (A15-A19)

        • Tuberculosis of other organs (A18)

        • A18 Tuberculosis of other organs
        • A18.0 Tuberculosis of bones and joints
        • A18.01 Tuberculosis of spine
        • A18.02 Tuberculous arthritis of other joints
        • A18.03 Tuberculosis of other bones
        • A18.09 Other musculoskeletal tuberculosis
        • A18.1 Tuberculosis of genitourinary system
        • A18.10 Tuberculosis of genitourinary system, unspecified
        • A18.11 Tuberculosis of kidney and ureter
        • A18.12 Tuberculosis of bladder
        • A18.13 Tuberculosis of other urinary organs
        • A18.14 Tuberculosis of prostate
        • A18.15 Tuberculosis of other male genital organs
        • A18.16 Tuberculosis of cervix
        • 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
        • A18.32 Tuberculous enteritis
        • A18.39 Retroperitoneal tuberculosis
        • A18.4 Tuberculosis of skin and subcutaneous tissue
        • A18.5 Tuberculosis of eye
        • A18.50 Tuberculosis of eye, unspecified
        • A18.51 Tuberculous episcleritis
        • A18.52 Tuberculous keratitis
        • 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
        • A18.81 Tuberculosis of thyroid gland
        • A18.82 Tuberculosis of other endocrine glands
        • A18.83 Tuberculosis of digestive tract organs, not elsewhere classified
        • A18.84 Tuberculosis of heart
        • A18.85 Tuberculosis of spleen
        • A18.89 Tuberculosis of other sites

Clinical Terms

The following clinical terms provide additional context, helping users better understand the clinical background and common associations for each diagnosis listed in this section. Including related terms alongside ICD-10-CM codes supports coders, billers, and healthcare professionals in improving accuracy, enhancing documentation, and facilitating research or patient education.

Erythema Induratum

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.

Granulomatous Mastitis

A rare, benign, inflammatory breast disease occurring in premenopausal women shortly after a recent pregnancy. The origin is unknown but it is commonly mistaken for malignancy and sometimes associated with BREAST FEEDING and the use of ORAL CONTRACEPTIVES.

Lupus Vulgaris

A form of cutaneous tuberculosis. It is seen predominantly in women and typically involves the NASAL MUCOSA; BUCCAL MUCOSA; and conjunctival mucosa.

Mesenteric Lymphadenitis

INFLAMMATION of LYMPH NODES in the MESENTERY.

Pyelitis

Inflammation of the KIDNEY PELVIS and KIDNEY CALICES where urine is collected before discharge, but does not involve the renal parenchyma (the NEPHRONS) where urine is processed.

Serositis

Inflammation of a serous membrane.

Tuberculoma

A tumor-like mass resulting from the enlargement of a tuberculous lesion.

Tuberculoma, Intracranial

A well-circumscribed mass composed of tuberculous granulation tissue that may occur in the cerebral hemispheres, cerebellum, brain stem, or perimeningeal spaces. Multiple lesions are quite common. Management of intracranial manifestations vary with lesion site. Intracranial tuberculomas may be associated with SEIZURES, focal neurologic deficits, and INTRACRANIAL HYPERTENSION. Spinal cord tuberculomas may be associated with localized or radicular pain, weakness, sensory loss, and incontinence. Tuberculomas may arise as OPPORTUNISTIC INFECTIONS, but also occur in immunocompetent individuals.