Tuberculosis of other organs (A18) ICD-10-CM
The A18 code range covers tuberculosis of other organs with 38 ICD-10-CM diagnosis codes. 32 of them are billable and valid for claim submission in fiscal year 2026, and the category headers group them but cannot themselves be billed.
Codes in the A18 Range 38 codes · 32 billable
- A18 Tuberculosis of other organsNon-billable
- A18.0 Tuberculosis of bones and jointsNon-billable
- 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 systemNon-billable
- 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 glandsNon-billable
- A18.31 Tuberculous peritonitis
- A18.32 Tuberculous enteritis
- A18.39 Retroperitoneal tuberculosis
- A18.4 Tuberculosis of skin and subcutaneous tissue
- A18.5 Tuberculosis of eyeNon-billable
- 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 organsNon-billable
- 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 in This Code Range
Definitions from the National Library of Medicine for conditions coded in the A18 range.
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.
About the A18 Code Range
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.
Questions About This Page
How many billable codes are in the A18 range?
Of the 38 codes in this range, 32 are billable and valid for claim submission from October 1, 2025 through September 30, 2026. Category header codes group them but cannot be reported on claims.
What does the A18 range classify?
The range classifies tuberculosis of other organs. Each code links to its own reference page with billing status, MS-DRG grouping, coding notes, and clinical information.
Related References
Source: CMS FY 2026 ICD-10-CM Tabular List and order file, effective October 1, 2025 through September 30, 2026.
