ICD-10-CM Code L03.90

Cellulitis, unspecified

Version 2020 Billable Code

Valid for Submission

L03.90 is a billable code used to specify a medical diagnosis of cellulitis, unspecified. The code is valid for the year 2020 for the submission of HIPAA-covered transactions. The ICD-10-CM code L03.90 might also be used to specify conditions or terms like acute bacterial paronychia, bacterial cellulitis, bacterial paronychia, cellulitis, cellulitis caused by staphylococcus aureus, cellulitis of digit, etc

Short Description:Cellulitis, unspecified
Long Description:Cellulitis, unspecified

Index to Diseases and Injuries

The Index to Diseases and Injuries is an alphabetical listing of medical terms, with each term mapped to one or more ICD-10 code(s). The following references for the code L03.90 are found in the index:


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

  • Acute bacterial paronychia
  • Bacterial cellulitis
  • Bacterial paronychia
  • Cellulitis
  • Cellulitis caused by Staphylococcus aureus
  • Cellulitis of digit
  • Cellulitis of skin
  • Cellulitis of skin with lymphangitis
  • Cellulitis with lymphangitis of digit
  • Chronic paronychia
  • Extensive post-operative wound cellulitis
  • Gram-negative bacterial cellulitis
  • Gram-negative bacterial cellulitis
  • Haemophilus cellulitis
  • Mucormycotic gangrenous cellulitis
  • Onychia
  • Onychia
  • Paronychia
  • Post-operative wound cellulitis
  • Pseudomonas aeruginosa infection of nail
  • Pseudomonas aeruginosa paronychia
  • Recurrent cellulitis
  • Streptococcal cellulitis
  • Traumatic onychia
  • Wound cellulitis

Clinical Information

  • CELLULITIS-. an acute diffuse and suppurative inflammation of loose connective tissue particularly the deep subcutaneous tissues and sometimes muscle which is most commonly seen as a result of infection of a wound ulcer or other skin lesions.
  • PARAMETRITIS-. inflammation of the parametrium the connective tissue of the pelvic floor extending from the subserous coat of the uterus laterally between the layers of the broad ligament.
  • ORBITAL CELLULITIS-. inflammation of the loose connective tissues around the orbit bony structure around the eyeball. it is characterized by pain; edema of the conjunctiva; swelling of the eyelids; exophthalmos; limited eye movement; and loss of vision.

Diagnostic Related Groups

The ICD-10 code L03.90 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 L03.90 to ICD-9

  • 682.9 - Cellulitis NOS (Approximate Flag)

Code Classification

  • Diseases of the skin and subcutaneous tissue (L00–L99)
    • Infections of the skin and subcutaneous tissue (L00-L08)
      • Cellulitis and acute lymphangitis (L03)

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


Cellulitis is an infection of the skin and deep underlying tissues. Group A strep (streptococcal) bacteria are the most common cause. The bacteria enter your body when you get an injury such as a bruise, burn, surgical cut, or wound.

Symptoms include

  • Fever and chills
  • Swollen glands or lymph nodes
  • A rash with painful, red, tender skin. The skin may blister and scab over.

Your health care provider may take a sample or culture from your skin or do a blood test to identify the bacteria causing infection. Treatment is with antibiotics. They may be oral in mild cases, or intravenous (by IV) for more severe cases.

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Lymphatic Diseases

The lymphatic system is a network of tissues and organs. It is made up of

  • Lymph - a fluid that contains white blood cells that defend against germs
  • Lymph vessels - vessels that carry lymph throughout your body. They are different from blood vessels.
  • Lymph nodes - glands found throughout the lymph vessels. Along with your spleen, these nodes are where white blood cells fight infection.

Your bone marrow and thymus produce the cells in lymph. They are part of the system, too.

The lymphatic system clears away infection and keeps your body fluids in balance. If it's not working properly, fluid builds in your tissues and causes swelling, called lymphedema. Other lymphatic system problems can include infections, blockage, and cancer.

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