ICD-10-CM Code L99

Other disorders of skin and subcutaneous tissue in diseases classified elsewhere

Version 2020 Billable Code Manifestation Diagnoses

Valid for Submission

L99 is a billable code used to specify a medical diagnosis of other disorders of skin and subcutaneous tissue in diseases classified elsewhere. The code is valid for the year 2020 for the submission of HIPAA-covered transactions. The ICD-10-CM code L99 might also be used to specify conditions or terms like acute chagas' disease, african trypanosomiasis affecting skin, amyloidosis cutis dyschromia, amyloidosis limited to skin, chagas' exanthem, cutaneous complication of rheumatoid disease, etc

Short Description:Oth disorders of skin, subcu in diseases classd elswhr
Long Description:Other disorders of skin and subcutaneous tissue in diseases classified elsewhere

Tabular List of Diseases and Injuries

The Tabular List of Diseases and Injuries is a list of ICD-10 codes, organized "head to toe" into chapters and sections with guidance for inclusions, exclusions, descriptions and more. The following references are applicable to the code L99:

Code First

Code First
Certain conditions have both an underlying etiology and multiple body system manifestations due to the underlying etiology. For such conditions, the ICD-10-CM has a coding convention that requires the underlying condition be sequenced first followed by the manifestation. Wherever such a combination exists, there is a "use additional code" note at the etiology code, and a "code first" note at the manifestation code. These instructional notes indicate the proper sequencing order of the codes, etiology followed by manifestation.
  • underlying disease, such as:
  • amyloidosis E85

Type 1 Excludes

Type 1 Excludes
A type 1 excludes note is a pure excludes note. It means "NOT CODED HERE!" An Excludes1 note indicates that the code excluded should never be used at the same time as the code above the Excludes1 note. An Excludes1 is used when two conditions cannot occur together, such as a congenital form versus an acquired form of the same condition.

Code Edits

The Medicare Code Editor (MCE) detects and reports errors in the coding of claims data. The following ICD-10 Code Edits are applicable to this code:

  • Manifestation diagnoses - Manifestation codes describe the manifestation of an underlying disease, not the disease itself, and therefore should not be used as a principal diagnosis.


The following clinical terms are approximate synonyms or lay terms that might be used to identify the correct diagnosis code:

  • Acute Chagas' disease
  • African trypanosomiasis affecting skin
  • Amyloidosis cutis dyschromia
  • Amyloidosis limited to skin
  • Chagas' exanthem
  • Cutaneous complication of rheumatoid disease
  • Cutaneous complication of rheumatoid disease
  • Cutaneous complication of systemic sclerosis
  • Dermatosis resulting from vascular insufficiency
  • Disorder of lymphatics affecting the skin
  • Metabolic and nutritional disorders affecting skin
  • Non-specific cutaneous reaction in Hodgkin's disease
  • Primary localized cutaneous amyloidosis
  • Pseudoscleroderma due to rheumatoid disease
  • Rheumatoid neutrophilic dermatitis
  • Secondary xanthomatous infiltration of the skin
  • Skin disorder associated with AIDS
  • Skin involvement in bacterial endocarditis
  • Skin lesion in drug addict
  • Small vessel thrombosis of skin
  • Spinal cord defect affecting skin
  • Systemic disease affecting skin
  • Trypanosomiasis affecting skin
  • Trypanosomiasis affecting skin

Diagnostic Related Groups

The ICD-10 code L99 is grouped in the following groups for version MS-DRG V37.0 What are Diagnostic Related Groups?
The Diagnostic Related Groups (DRGs) are a patient classification scheme which provides a means of relating the type of patients a hospital treats. The DRGs divides all possible principal diagnoses into mutually exclusive principal diagnosis areas referred to as Major Diagnostic Categories (MDC).
applicable from 10/01/2019 through 09/30/2020.


Convert L99 to ICD-9

  • 701.8 - Skin hypertro/atroph NEC (Approximate Flag)
  • 709.8 - Skin disorders NEC (Approximate Flag)

Code Classification

  • Diseases of the skin and subcutaneous tissue (L00–L99)
    • Other disorders of the skin and subcutaneous tissue (L80-L99)
      • Oth disorders of skin, subcu in diseases classd elswhr (L99)

Code History

  • FY 2016 - New Code, effective from 10/1/2015 through 9/30/2016
    (First year ICD-10-CM implemented into the HIPAA code set)
  • FY 2017 - No Change, effective from 10/1/2016 through 9/30/2017
  • FY 2018 - No Change, effective from 10/1/2017 through 9/30/2018
  • FY 2019 - No Change, effective from 10/1/2018 through 9/30/2019
  • FY 2020 - No Change, effective from 10/1/2019 through 9/30/2020

Information for Patients

Skin Conditions

Your skin is your body's largest organ. It covers and protects your body. Your skin

  • Holds body fluids in, preventing dehydration
  • Keeps harmful microbes out, preventing infections
  • Helps you feel things like heat, cold, and pain
  • Keeps your body temperature even
  • Makes vitamin D when the sun shines on it

Anything that irritates, clogs, or inflames your skin can cause symptoms such as redness, swelling, burning, and itching. Allergies, irritants, your genetic makeup, and certain diseases and immune system problems can cause rashes, hives, and other skin conditions. Many skin problems, such as acne, also affect your appearance.

NIH: National Institute of Arthritis and Musculoskeletal and Skin Diseases

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