1. ICD-10-CM Codes
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2. A00-B99 Certain infectious and parasitic diseases
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3. B35-B49 Mycoses
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4. B35- Dermatophytosis
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2020 ICD-10-CM Diagnosis Code B35.9

Dermatophytosis, unspecified

2016 2017 2018 2019 2020 Billable/Specific Code

• B35.9 is a billable/specific ICD-10-CM code that can be used to indicate a diagnosis for reimbursement purposes.
• The 2020 edition of ICD-10-CM B35.9 became effective on October 1, 2019.
• This is the American ICD-10-CM version of B35.9 - other international versions of ICD-10 B35.9 may differ.

• Dermatophytosis
• Dermatophytosis (fungal infection of skin)

• Fungal infection of keratinized tissues such as hair, skin and nails. The main causative fungi include microsporum; trichophyton; and epidermophyton.
• General term describing various dermatophytoses; specific types include tinea capitis (ringworm of the scalp), tinea favosa (of scalp and skin), tinea pedis (athlete's foot), and tinea unguium (ringworm of the nails).
• Tinea is the name of a group of diseases caused by a fungus. Types of tinea include ringworm, athlete's foot and jock itch. These infections are usually not serious, but they can be uncomfortable. You can get them by touching an infected person, from damp surfaces such as shower floors, or even from a pet. Symptoms depend on the affected area of the body:
  • ringworm is a red skin rash that forms a ring around normal-looking skin. A worm doesn't cause it.
  • scalp ringworm causes itchy, red patches on your head. It can leave bald spots. It usually affects children.
  • athlete's foot causes itching, burning and cracked skin between your toes.
  • jock itch causes an itchy, burning rash in your groin area.
  over-the-counter creams and powders will get rid of many tinea infections, particularly athlete's foot and jock itch. Other cases require prescription medicine.

• 606 Minor skin disorders with mcc
• 607 Minor skin disorders without mcc

Convert B35.9 to ICD-9-CM

• 2016 (effective 10/1/2015): New code (first year of non-draft ICD-10-CM)
• 2017 (effective 10/1/2016): No change
• 2018 (effective 10/1/2017): No change
• 2019 (effective 10/1/2018): No change
• 2020 (effective 10/1/2019): No change

• Dermatophytosis (epidermophyton) (infection) (Microsporum) (tinea) (Trichophyton) B35.9
• Ringworm B35.9
• Tinea (intersecta) (tarsi) B35.9

Reimbursement claims with a date of service on or after October 1, 2015 require the use of ICD-10-CM codes.