Corns and callosities
In Other disorders of the skin and subcutaneous tissue (L80-L99), chapter 12: Diseases of the Skin and Subcutaneous Tissue
- L84 is billable and valid on claims for FY 2027. If the record has more detail, check the other codes under L80-L99 below.
- As a secondary diagnosis it is not a CC or MCC, so it doesn't raise the MS-DRG payment.
- Doesn't count toward a Medicare Advantage risk score (no HCC in V28).
- AHRQ's Chronic Condition Indicator classes it as not chronic (an acute or short-term condition).
Also indexed as: Callositas; Callus; Clavus; Corn; Heloma; Tylosis
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Instructional notes
Includes: conditions that are coded here
- Callus
- Clavus
Official coding guidelines
From the ICD-10-CM Official Guidelines for Coding and Reporting, FY 2027 (CMS and NCHS). Links open the PDF at the right page.
Covers assigning pressure ulcer codes by site and stage, including unstageable, healing, healed, and progressing ulcers, and coding healing or progressing non-pressure chronic ulcers.
- Pressure ulcer stage codes (page 58)
- Non-Pressure Chronic Ulcers (page 60)
Other codes under L80-L99
Other disorders of the skin and subcutaneous tissue (L80-L99)
- L80Vitiligo
- L81Other disorders of pigmentation
- L82Seborrheic keratosis
- L83Acanthosis nigricans
- L84Corns and callosities(this code)
- L85Other epidermal thickening
- L86Keratoderma in diseases classified elsewhere
- L87Transepidermal elimination disorders
- L88Pyoderma gangrenosum
- L89Pressure ulcer
- L90Atrophic disorders of skin
- L91Hypertrophic disorders of skin
- L92Granulomatous disorders of skin and subcutaneous tissue
- L93Lupus erythematosus
- L94Other localized connective tissue disorders
- L95Vasculitis limited to skin, not elsewhere classified
- L97Non-pressure chronic ulcer of lower limb, not elsewhere classified
- L98Other disorders of skin and subcutaneous tissue, not elsewhere classified
- L99Other disorders of skin and subcutaneous tissue in diseases classified elsewhere
L84 MS-DRGs
As the principal diagnosis, L84 groups to MS-DRG 606 or 607 (v44.0). Which one applies depends on procedures performed, secondary diagnoses (CC/MCC), and the patient's age and discharge status.
Related conditions
Grouped by AHRQ's Clinical Classifications Software Refined (CCSR), which sorts every diagnosis code into clinically meaningful categories.
L84 is in Other specified and unspecified skin disorders (SKN007, its default category), with 157 codes. Others in it:
Medicare coverage articles listing L84
These 3 Medicare billing and coding articles list L84 as a diagnosis that supports medical necessity for the services they cover. From the CMS Medicare Coverage Database; check your own contractor's article before billing.
About the condition
Plain-language background from MedlinePlus (National Library of Medicine), not coding guidance.
Corns and Calluses
Corns and calluses are caused by pressure or friction on your skin. They often appear on feet where the bony parts of your feet rub against your shoes. Corns usually appear on the tops or sides of toes while calluses form on the soles of feet. Calluses also can appear on hands or other areas that are rubbed or pressed.
Read more about corns and calluses on MedlinePlusCode history
Valid since FY2016, when ICD-10-CM took effect on October 1, 2015. No changes since.
ICD-9-CM equivalent
Legacy crosswalk from the CMS General Equivalence Mappings (last updated 2018).
- 700 Corns and callosities