ICD-10 Coding/Diseases of the Skin and Subcutaneous Tissue

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This lesson introduces ICD-10-CM Diseases of the Skin and Subcutaneous Tissue.

Objectives and Skills[edit]

Objectives and skills for this lesson include:

  • Know how to classify dermatitis due to contact, food, and ingestion of drug (both correct and incorrect usage).
  • Code ulcers of the skin.
  • Explain how to classify cellulitis based on location and the primary goal of the treatment.
  • Code procedures done on the skin, such as excisions, debridement, and grafting.


Start Here[edit]

ICD-10-CM Official Guidelines for Coding and Reporting FY2019[edit]

Chapter 12 specific guidelines can be found on pages 55-57 of this document

Part 1: Diagnoses[edit]

CG I.C.12.a. Pressure ulcer stage codes[edit]
CG I.C.12.a.1) Pressure ulcer stages[edit]
CG I.C.12.a.2) Unstageable pressure ulcers[edit]
CG I.C.12.a.3) Documented pressure ulcer stage[edit]
CG I.C.12.a.4) Patients admitted with pressure ulcers documented as healed[edit]
CG I.C.12.a.5) Patients admitted with pressure ulcers documented as healing[edit]
CG I.C.12.a.6) Patient admitted with pressure ulcer evolving into another stage during the admission[edit]

Part 2: Procedures[edit]

Learning Resources[edit]

An illustration depicting pressure ulcer sites, including Occiput, Elbow, Hip, Sacrum, Buttocks, Ankle and Heel.

Pressure Ulcers

Mayo Clinic: Bed Sores: https://www.mayoclinic.org/diseases-conditions/bed-sores/symptoms-causes/syc-20355893

Medline: Pressure Sores https://medlineplus.gov/pressuresores.html

WebMD: Stages of Pressure Sores https://www.webmd.com/skin-problems-and-treatments/pressure-sores-4-stages#1

Bed Sores or Pressure Sores: What you need to know https://www.medicalnewstoday.com/articles/173972.php#treatment


Mayo Clinic: Cellulitis https://www.mayoclinic.org/diseases-conditions/cellulitis/symptoms-causes/syc-20370762#targetText=Cellulitis%20(sel%2Du%2DLIE,face%2C%20arms%20and%20other%20areas.

Cellulitis: Everything You Need to Know https://www.healthline.com/health/cellulitis#symptoms

Cellulitis: Diagnosis and Treatment https://www.aad.org/diseases/a-z/cellulitis-treatment


Mayo Clinic: Dermatitis https://www.mayoclinic.org/diseases-conditions/dermatitis-eczema/symptoms-causes/syc-20352380

What is dermatitis? https://www.webmd.com/skin-problems-and-treatments/guide/understanding-dermatitis-basics#1

Contact Dermatitis Overview https://www.aaaai.org/conditions-and-treatments/library/allergy-library/contact-dermatitis

Dermatitis https://my.clevelandclinic.org/health/articles/4089-dermatitis


  1. Review guidelines and learning resources for this chapter.
  2. Write and code a clinical scenario base on one ICD-10-CM guidelines from this chapter. Cite the guidelines and post above. (Part 1 Diagnosis)
  3. Write and code a clinical scenario utilizing ICD-10-CM abd ICD-10-PCS codes for conditions and treatments related to this chapter.
  4. Contribute to lesson summary and/or key terms.
  5. Go to the LMS and complete the weekly assignment.

Lesson Summary[edit]

Key Terms[edit]

Cellulitis - a common, potentially serious bacterial skin infection that occurs when a crack or break in your skin allows bacteria to enter.. The affected skin appears swollen and red and is typically painful and warm to the touch. Left untreated, the infection can spread to your lymph nodes and bloodstream and rapidly become life-threatening. It isn't usually spread from person to person. [1]

See Also[edit]


  1. "Cellulitis - Symptoms and causes". Mayo Clinic. Retrieved 2019-10-03.