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  3. L00–L99
  4. L80-L99
  5. Other disorders of skin and subcutaneous tissue, not elsewhere classified (L98)

Other disorders of skin and subcutaneous tissue, not elsewhere classified (L98)

The ICD-10 code section L98 covers a variety of other disorders of the skin and subcutaneous tissue not classified elsewhere. It includes specific conditions like pyogenic granuloma, factitial dermatitis, and various chronic ulcers, providing precise codes to document these unique skin disorders.

This code range is used for skin conditions that do not fit into more common categories. For instance, L98.0 codes pyogenic granuloma, also known as granuloma gravidarum or hemangioma of the face, which refers to a benign vascular skin growth often confused with infections. L98.1 codes factitial dermatitis, conditions like repetitive self-inflicted skin injury, also called cutaneous Munchausen syndrome. Chronic non-pressure ulcers of the buttock, back, or other sites are detailed extensively from L98.4 through L98.49, capturing ulcer severity and tissue involvement. Additionally, codes like L98.5 identify skin mucinoses, including lichen myxedematosus, while L98.6 and L98.7 cover infiltrative disorders and excessive redundant skin respectively. The section also includes a broad category (L98.8) for other specified disorders such as pseudoxanthoma elasticum and various complex skin changes, plus an unspecified code (L98.9) for disorders without a more precise classification. This coding allows healthcare providers and medical coders to accurately capture diagnosis details for uncommon and complex skin conditions within the ICD-10 framework.

  • Diseases of the skin and subcutaneous tissue (L00–L99)

    • Other disorders of the skin and subcutaneous tissue (L80-L99)

        • Other disorders of skin and subcutaneous tissue, not elsewhere classified (L98)

        • L98 Other disorders of skin and subcutaneous tissue, not elsewhere classified
        • L98.0 Pyogenic granuloma
        • L98.1 Factitial dermatitis
        • L98.2 Febrile neutrophilic dermatosis [Sweet]
        • L98.3 Eosinophilic cellulitis [Wells]
        • L98.4 Non-pressure chronic ulcer of skin, not elsewhere classified
        • L98.41 Non-pressure chronic ulcer of buttock
        • L98.411 Non-pressure chronic ulcer of buttock limited to breakdown of skin
        • L98.412 Non-pressure chronic ulcer of buttock with fat layer exposed
        • L98.413 Non-pressure chronic ulcer of buttock with necrosis of muscle
        • L98.414 Non-pressure chronic ulcer of buttock with necrosis of bone
        • L98.415 Non-pressure chronic ulcer of buttock with muscle involvement without evidence of necrosis
        • L98.416 Non-pressure chronic ulcer of buttock with bone involvement without evidence of necrosis
        • L98.418 Non-pressure chronic ulcer of buttock with other specified severity
        • L98.419 Non-pressure chronic ulcer of buttock with unspecified severity
        • L98.42 Non-pressure chronic ulcer of back
        • L98.421 Non-pressure chronic ulcer of back limited to breakdown of skin
        • L98.422 Non-pressure chronic ulcer of back with fat layer exposed
        • L98.423 Non-pressure chronic ulcer of back with necrosis of muscle
        • L98.424 Non-pressure chronic ulcer of back with necrosis of bone
        • L98.425 Non-pressure chronic ulcer of back with muscle involvement without evidence of necrosis
        • L98.426 Non-pressure chronic ulcer of back with bone involvement without evidence of necrosis
        • L98.428 Non-pressure chronic ulcer of back with other specified severity
        • L98.429 Non-pressure chronic ulcer of back with unspecified severity
        • L98.43 Non-pressure chronic ulcer of abdomen
        • L98.431 Non-pressure chronic ulcer of abdomen limited to breakdown of skin NEW CODE
        • L98.432 Non-pressure chronic ulcer of abdomen with fat layer exposed NEW CODE
        • L98.433 Non-pressure chronic ulcer of abdomen with necrosis of muscle NEW CODE
        • L98.434 Non-pressure chronic ulcer of abdomen with necrosis of bone NEW CODE
        • L98.435 Non-pressure chronic ulcer of abdomen with muscle involvement without evidence of necrosis NEW CODE
        • L98.436 Non-pressure chronic ulcer of abdomen with bone involvement without evidence of necrosis NEW CODE
        • L98.438 Non-pressure chronic ulcer of abdomen with other specified severity NEW CODE
        • L98.439 Non-pressure chronic ulcer of abdomen with unspecified severity NEW CODE
        • L98.44 Non-pressure chronic ulcer of chest
        • L98.441 Non-pressure chronic ulcer of chest limited to breakdown of skin NEW CODE
        • L98.442 Non-pressure chronic ulcer of chest with fat layer exposed NEW CODE
        • L98.443 Non-pressure chronic ulcer of chest with necrosis of muscle NEW CODE
        • L98.444 Non-pressure chronic ulcer of chest with necrosis of bone NEW CODE
        • L98.445 Non-pressure chronic ulcer of chest with muscle involvement without evidence of necrosis NEW CODE
        • L98.446 Non-pressure chronic ulcer of chest with bone involvement without evidence of necrosis NEW CODE
        • L98.448 Non-pressure chronic ulcer of chest with other specified severity NEW CODE
        • L98.449 Non-pressure chronic ulcer of chest with unspecified severity NEW CODE
        • L98.45 Non-pressure chronic ulcer of neck
        • L98.451 Non-pressure chronic ulcer of neck limited to breakdown of skin NEW CODE
        • L98.452 Non-pressure chronic ulcer of neck with fat layer exposed NEW CODE
        • L98.453 Non-pressure chronic ulcer of neck with necrosis of muscle NEW CODE
        • L98.454 Non-pressure chronic ulcer of neck with necrosis of bone NEW CODE
        • L98.455 Non-pressure chronic ulcer of neck with muscle involvement without evidence of necrosis NEW CODE
        • L98.456 Non-pressure chronic ulcer of neck with bone involvement without evidence of necrosis NEW CODE
        • L98.458 Non-pressure chronic ulcer of neck with other specified severity NEW CODE
        • L98.459 Non-pressure chronic ulcer of neck with unspecified severity NEW CODE
        • L98.46 Non-pressure chronic ulcer of face
        • L98.461 Non-pressure chronic ulcer of face limited to breakdown of skin NEW CODE
        • L98.462 Non-pressure chronic ulcer of face with fat layer exposed NEW CODE
        • L98.463 Non-pressure chronic ulcer of face with necrosis of muscle NEW CODE
        • L98.464 Non-pressure chronic ulcer of face with necrosis of bone NEW CODE
        • L98.465 Non-pressure chronic ulcer of face with muscle involvement without evidence of necrosis NEW CODE
        • L98.466 Non-pressure chronic ulcer of face with bone involvement without evidence of necrosis NEW CODE
        • L98.468 Non-pressure chronic ulcer of face with other specified severity NEW CODE
        • L98.469 Non-pressure chronic ulcer of face with unspecified severity NEW CODE
        • L98.47 Non-pressure chronic ulcer of groin
        • L98.471 Non-pressure chronic ulcer of groin limited to breakdown of skin NEW CODE
        • L98.472 Non-pressure chronic ulcer of groin with fat layer exposed NEW CODE
        • L98.473 Non-pressure chronic ulcer of groin with necrosis of muscle NEW CODE
        • L98.474 Non-pressure chronic ulcer of groin with necrosis of bone NEW CODE
        • L98.475 Non-pressure chronic ulcer of groin with muscle involvement without evidence of necrosis NEW CODE
        • L98.476 Non-pressure chronic ulcer of groin with bone involvement without evidence of necrosis NEW CODE
        • L98.478 Non-pressure chronic ulcer of groin with other specified severity NEW CODE
        • L98.479 Non-pressure chronic ulcer of groin with unspecified severity NEW CODE
        • L98.49 Non-pressure chronic ulcer of skin of other sites
        • L98.491 Non-pressure chronic ulcer of skin of other sites limited to breakdown of skin
        • L98.492 Non-pressure chronic ulcer of skin of other sites with fat layer exposed
        • L98.493 Non-pressure chronic ulcer of skin of other sites with necrosis of muscle
        • L98.494 Non-pressure chronic ulcer of skin of other sites with necrosis of bone
        • L98.495 Non-pressure chronic ulcer of skin of other sites with muscle involvement without evidence of necrosis
        • L98.496 Non-pressure chronic ulcer of skin of other sites with bone involvement without evidence of necrosis
        • L98.498 Non-pressure chronic ulcer of skin of other sites with other specified severity
        • L98.499 Non-pressure chronic ulcer of skin of other sites with unspecified severity
        • L98.5 Mucinosis of the skin
        • L98.6 Other infiltrative disorders of the skin and subcutaneous tissue
        • L98.7 Excessive and redundant skin and subcutaneous tissue
        • L98.8 Other specified disorders of the skin and subcutaneous tissue
        • L98.9 Disorder of the skin and subcutaneous tissue, unspecified
        • L98.A Non-pressure chronic ulcer of upper limb, not elsewhere classified
        • L98.A1 Non-pressure chronic ulcer of upper arm
        • L98.A11 Non-pressure chronic ulcer of right upper arm
        • L98.A111 Non-pressure chronic ulcer of right upper arm limited to breakdown of skin NEW CODE
        • L98.A112 Non-pressure chronic ulcer of right upper arm with fat layer exposed NEW CODE
        • L98.A113 Non-pressure chronic ulcer of right upper arm with necrosis of muscle NEW CODE
        • L98.A114 Non-pressure chronic ulcer of right upper arm with necrosis of bone NEW CODE
        • L98.A115 Non-pressure chronic ulcer of right upper arm with muscle involvement without evidence of necrosis NEW CODE
        • L98.A116 Non-pressure chronic ulcer of right upper arm with bone involvement without evidence of necrosis NEW CODE
        • L98.A118 Non-pressure chronic ulcer of right upper arm with other specified severity NEW CODE
        • L98.A119 Non-pressure chronic ulcer of right upper arm with unspecified severity NEW CODE
        • L98.A12 Non-pressure chronic ulcer of left upper arm
        • L98.A121 Non-pressure chronic ulcer of left upper arm limited to breakdown of skin NEW CODE
        • L98.A122 Non-pressure chronic ulcer of left upper arm with fat layer exposed NEW CODE
        • L98.A123 Non-pressure chronic ulcer of left upper arm with necrosis of muscle NEW CODE
        • L98.A124 Non-pressure chronic ulcer of left upper arm with necrosis of bone NEW CODE
        • L98.A125 Non-pressure chronic ulcer of left upper arm with muscle involvement without evidence of necrosis NEW CODE
        • L98.A126 Non-pressure chronic ulcer of left upper arm with bone involvement without evidence of necrosis NEW CODE
        • L98.A128 Non-pressure chronic ulcer of left upper arm with other specified severity NEW CODE
        • L98.A129 Non-pressure chronic ulcer of left upper arm with unspecified severity NEW CODE
        • L98.A19 Non-pressure chronic ulcer of unspecified upper arm
        • L98.A191 Non-pressure chronic ulcer of unspecified upper arm limited to breakdown of skin NEW CODE
        • L98.A192 Non-pressure chronic ulcer of unspecified upper arm with fat layer exposed NEW CODE
        • L98.A193 Non-pressure chronic ulcer of unspecified upper arm with necrosis of muscle NEW CODE
        • L98.A194 Non-pressure chronic ulcer of unspecified upper arm with necrosis of bone NEW CODE
        • L98.A195 Non-pressure chronic ulcer of unspecified upper arm with muscle involvement without evidence of necrosis NEW CODE
        • L98.A196 Non-pressure chronic ulcer of unspecified upper arm with bone involvement without evidence of necrosis NEW CODE
        • L98.A198 Non-pressure chronic ulcer of unspecified upper arm with other specified severity NEW CODE
        • L98.A199 Non-pressure chronic ulcer of unspecified upper arm with unspecified severity NEW CODE
        • L98.A2 Non-pressure chronic ulcer of forearm
        • L98.A21 Non-pressure chronic ulcer of right forearm
        • L98.A211 Non-pressure chronic ulcer of right forearm limited to breakdown of skin NEW CODE
        • L98.A212 Non-pressure chronic ulcer of right forearm with fat layer exposed NEW CODE
        • L98.A213 Non-pressure chronic ulcer of right forearm with necrosis of muscle NEW CODE
        • L98.A214 Non-pressure chronic ulcer of right forearm with necrosis of bone NEW CODE
        • L98.A215 Non-pressure chronic ulcer of right forearm with muscle involvement without evidence of necrosis NEW CODE
        • L98.A216 Non-pressure chronic ulcer of right forearm with bone involvement without evidence of necrosis NEW CODE
        • L98.A218 Non-pressure chronic ulcer of right forearm with other specified severity NEW CODE
        • L98.A219 Non-pressure chronic ulcer of right forearm with unspecified severity NEW CODE
        • L98.A22 Non-pressure chronic ulcer of left forearm
        • L98.A221 Non-pressure chronic ulcer of left forearm limited to breakdown of skin NEW CODE
        • L98.A222 Non-pressure chronic ulcer of left forearm with fat layer exposed NEW CODE
        • L98.A223 Non-pressure chronic ulcer of left forearm with necrosis of muscle NEW CODE
        • L98.A224 Non-pressure chronic ulcer of left forearm with necrosis of bone NEW CODE
        • L98.A225 Non-pressure chronic ulcer of left forearm with muscle involvement without evidence of necrosis NEW CODE
        • L98.A226 Non-pressure chronic ulcer of left forearm with bone involvement without evidence of necrosis NEW CODE
        • L98.A228 Non-pressure chronic ulcer of left forearm with other specified severity NEW CODE
        • L98.A229 Non-pressure chronic ulcer of left forearm with unspecified severity NEW CODE
        • L98.A29 Non-pressure chronic ulcer of unspecified forearm
        • L98.A291 Non-pressure chronic ulcer of unspecified forearm limited to breakdown of skin NEW CODE
        • L98.A292 Non-pressure chronic ulcer of unspecified forearm with fat layer exposed NEW CODE
        • L98.A293 Non-pressure chronic ulcer of unspecified forearm with necrosis of muscle NEW CODE
        • L98.A294 Non-pressure chronic ulcer of unspecified forearm with necrosis of bone NEW CODE
        • L98.A295 Non-pressure chronic ulcer of unspecified forearm with muscle involvement without evidence of necrosis NEW CODE
        • L98.A296 Non-pressure chronic ulcer of unspecified forearm with bone involvement without evidence of necrosis NEW CODE
        • L98.A298 Non-pressure chronic ulcer of unspecified forearm with other specified severity NEW CODE
        • L98.A299 Non-pressure chronic ulcer of unspecified forearm with unspecified severity NEW CODE
        • L98.A3 Non-pressure chronic ulcer of hand
        • L98.A31 Non-pressure chronic ulcer of right hand
        • L98.A311 Non-pressure chronic ulcer of right hand limited to breakdown of skin NEW CODE
        • L98.A312 Non-pressure chronic ulcer of right hand with fat layer exposed NEW CODE
        • L98.A313 Non-pressure chronic ulcer of right hand with necrosis of muscle NEW CODE
        • L98.A314 Non-pressure chronic ulcer of right hand with necrosis of bone NEW CODE
        • L98.A315 Non-pressure chronic ulcer of right hand with muscle involvement without evidence of necrosis NEW CODE
        • L98.A316 Non-pressure chronic ulcer of right hand with bone involvement without evidence of necrosis NEW CODE
        • L98.A318 Non-pressure chronic ulcer of right hand with other specified severity NEW CODE
        • L98.A319 Non-pressure chronic ulcer of right hand with unspecified severity NEW CODE
        • L98.A32 Non-pressure chronic ulcer of left hand
        • L98.A321 Non-pressure chronic ulcer of left hand limited to breakdown of skin NEW CODE
        • L98.A322 Non-pressure chronic ulcer of left hand with fat layer exposed NEW CODE
        • L98.A323 Non-pressure chronic ulcer of left hand with necrosis of muscle NEW CODE
        • L98.A324 Non-pressure chronic ulcer of left hand with necrosis of bone NEW CODE
        • L98.A325 Non-pressure chronic ulcer of left hand with muscle involvement without evidence of necrosis NEW CODE
        • L98.A326 Non-pressure chronic ulcer of left hand with bone involvement without evidence of necrosis NEW CODE
        • L98.A328 Non-pressure chronic ulcer of left hand with other specified severity NEW CODE
        • L98.A329 Non-pressure chronic ulcer of left hand with unspecified severity NEW CODE
        • L98.A39 Non-pressure chronic ulcer of unspecified hand
        • L98.A391 Non-pressure chronic ulcer of unspecified hand limited to breakdown of skin NEW CODE
        • L98.A392 Non-pressure chronic ulcer of unspecified hand with fat layer exposed NEW CODE
        • L98.A393 Non-pressure chronic ulcer of unspecified hand with necrosis of muscle NEW CODE
        • L98.A394 Non-pressure chronic ulcer of unspecified hand with necrosis of bone NEW CODE
        • L98.A395 Non-pressure chronic ulcer of unspecified hand with muscle involvement without evidence of necrosis NEW CODE
        • L98.A396 Non-pressure chronic ulcer of unspecified hand with bone involvement without evidence of necrosis NEW CODE
        • L98.A398 Non-pressure chronic ulcer of unspecified hand with other specified severity NEW CODE
        • L98.A399 Non-pressure chronic ulcer of unspecified hand with unspecified severity NEW CODE

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.

Arteries

The vessels carrying blood away from the heart.

Arterio-Arterial Fistula

Abnormal communication between two ARTERIES that may result from injury or occur as a congenital abnormality.

Arteriovenous Fistula

An abnormal direct communication between an artery and a vein without passing through the CAPILLARIES. An A-V fistula usually leads to the formation of a dilated sac-like connection, arteriovenous aneurysm. The locations and size of the shunts determine the degree of effects on the cardiovascular functions such as BLOOD PRESSURE and HEART RATE.

Biliary Fistula

Abnormal passage in any organ of the biliary tract or between biliary organs and other organs.

Bronchial Fistula

An abnormal passage or communication between a bronchus and another part of the body.

Carotid-Cavernous Sinus Fistula

An acquired or spontaneous abnormality in which there is communication between CAVERNOUS SINUS, a venous structure, and the CAROTID ARTERIES. It is often associated with HEAD TRAUMA, specifically basilar skull fractures (SKULL FRACTURE, BASILAR). Clinical signs often include VISION DISORDERS and INTRACRANIAL HYPERTENSION.

Cassia

A plant genus of the family FABACEAE. Many species of this genus, including the medicinal C. senna and C. angustifolia, have been reclassified into the Senna genus (SENNA PLANT) and some to CHAMAECRISTA.

Cutaneous Fistula

An abnormal passage or communication leading from an internal organ to the surface of the body.

Dental Fistula

An abnormal passage in the oral cavity on the gingiva.

Digestive System Fistula

An abnormal passage communicating between any components of the digestive system, or between any part of the digestive system and surrounding organ(s).

Esophageal Fistula

Abnormal passage communicating with the ESOPHAGUS. The most common type is TRACHEOESOPHAGEAL FISTULA between the esophagus and the TRACHEA.

Fistula

Abnormal communication most commonly seen between two internal organs, or between an internal organ and the surface of the body.

Gastric Fistula

Abnormal passage communicating with the STOMACH.

Hyaline Fibromatosis Syndrome

Autosomal recessive disorder characterized by HYALINE deposition in the skin, bone, gastrointestinal tract, muscles and glands; multiple subcutaneous skin nodules; GINGIVAL HYPERTROPHY; and joint CONTRACTURES. Mutations in the capillary morphogenesis protein-2 are associated with the disorder.

Intestinal Fistula

An abnormal anatomical passage between the INTESTINE, and another segment of the intestine or other organs. External intestinal fistula is connected to the SKIN (enterocutaneous fistula). Internal intestinal fistula can be connected to a number of organs, such as STOMACH (gastrocolic fistula), the BILIARY TRACT (cholecystoduodenal fistula), or the URINARY BLADDER of the URINARY TRACT (colovesical fistula). Risk factors include inflammatory processes, cancer, radiation treatment, and surgical misadventures (MEDICAL ERRORS).

Necrobiotic Xanthogranuloma

A cutaneous necrobiotic disorder characterized by firm, yellow plaques or nodules, often in a periorbital distribution. It is often accompanied by an elevated ERYTHROCYTE SEDIMENTATION RATE; LEUKOPENIA; and MONOCLONAL GAMMOPATHY (IgG-kappa type) and systemic involvement.

Oral Fistula

An abnormal passage within the mouth communicating between two or more anatomical structures.

Oroantral Fistula

A fistula between the maxillary sinus and the oral cavity.

Pancreas

A nodular organ in the ABDOMEN that contains a mixture of ENDOCRINE GLANDS and EXOCRINE GLANDS. The small endocrine portion consists of the ISLETS OF LANGERHANS secreting a number of hormones into the blood stream. The large exocrine portion (EXOCRINE PANCREAS) is a compound acinar gland that secretes several digestive enzymes into the pancreatic ductal system that empties into the DUODENUM.

Pancreatic Fistula

Abnormal passage communicating with the PANCREAS.

Portacaval Shunt, Surgical

Surgical portasystemic shunt between the portal vein and inferior vena cava.

Pseudoxanthoma Elasticum

An inherited disorder of connective tissue with extensive degeneration and calcification of ELASTIC TISSUE primarily in the skin, eye, and vasculature. At least two forms exist, autosomal recessive and autosomal dominant. This disorder is caused by mutations of one of the ATP-BINDING CASSETTE TRANSPORTERS. Patients are predisposed to MYOCARDIAL INFARCTION and GASTROINTESTINAL HEMORRHAGE.

Rectal Fistula

An abnormal anatomical passage connecting the RECTUM to the outside, with an orifice at the site of drainage.

Rectovaginal Fistula

An abnormal anatomical passage between the RECTUM and the VAGINA.

Rectum

The distal segment of the LARGE INTESTINE, between the SIGMOID COLON and the ANAL CANAL.

Respiratory Tract Fistula

An abnormal passage communicating between any component of the respiratory tract or between any part of the respiratory system and surrounding organs.

Salivary Gland Fistula

A fistula between a salivary duct or gland and the cutaneous surface of the oral cavity.

Scleromyxedema

A connective tissue disorder characterized by widespread thickening of SKIN with a cobblestone-like appearance. It is caused by proliferation of FIBROBLASTS and deposition of MUCIN in the DERMIS in the absence of thyroid disease. Most scleromyxedema cases are associated with a MONOCLONAL GAMMOPATHY, immunoglobulin IgG-lambda.

Skin Ulcer

An ULCER of the skin and underlying tissues.

Stomach

An organ of digestion situated in the left upper quadrant of the abdomen between the termination of the ESOPHAGUS and the beginning of the DUODENUM.

Tracheoesophageal Fistula

Abnormal passage between the ESOPHAGUS and the TRACHEA, acquired or congenital, often associated with ESOPHAGEAL ATRESIA.

Ulcer

A lesion on the surface of the skin or a mucous surface, produced by the sloughing of inflammatory necrotic tissue.

Urinary Bladder

A musculomembranous sac along the URINARY TRACT. URINE flows from the KIDNEYS into the bladder via the ureters (URETER), and is held there until URINATION.

Urinary Bladder Fistula

An abnormal passage in the URINARY BLADDER or between the bladder and any surrounding organ.

Urinary Fistula

An abnormal passage in any part of the URINARY TRACT between itself or with other organs.

Urinary Tract

The duct which coveys URINE from the pelvis of the KIDNEY through the URETERS, BLADDER, and URETHRA.

Vaginal Fistula

An abnormal anatomical passage that connects the VAGINA to other organs, such as the bladder (VESICOVAGINAL FISTULA) or the rectum (RECTOVAGINAL FISTULA).

Vascular Fistula

An abnormal passage between two or more BLOOD VESSELS, between ARTERIES; VEINS; or between an artery and a vein.

Vesicovaginal Fistula

An abnormal anatomical passage between the URINARY BLADDER and the VAGINA.