2026 ICD-10-CM Diagnosis Code C44.721Squamous cell carcinoma of skin of unspecified lower limb, including hip
ICD-10-CM Codes›C00–D49›C43-C44›C44
- Billable — Valid for Submission
- Not Chronic
C44.721 is a billable ICD-10-CM diagnosis code for squamous cell carcinoma of skin of unspecified lower limb, including hip. It is valid on HIPAA claims for fiscal year 2026 (October 1, 2025 through September 30, 2026) and groups to MS-DRG 606 through 607. Coders also document this condition as plantar verrucous carcinoma. In AHRQ's Clinical Classifications Software (CCSR), this diagnosis falls under Skin cancers - squamous cell carcinoma.
Code Identity
Code Classification
Approximate SynonymsGuidance
Alternate terms and clinical phrases that map to this code.
- Plantar verrucous carcinoma
- Primary malignant neoplasm of skin of foot
- Primary squamous cell carcinoma of skin of foot
- Squamous cell carcinoma in situ of skin of lower limb
- Squamous cell carcinoma of foot
- Squamous cell carcinoma of skin of lower extremity
Clinical ClassificationClinical
AHRQ’s CCSR groups this code into broader clinical categories.
Table of NeoplasmsClinical
Anatomical sites in the Table of Neoplasms that reference this code family.
| Site | Malig. Primary | Malig. Secondary | Ca in situ | Benign | Uncertain | Unspec. |
|---|---|---|---|---|---|---|
| skin NOS › limb NEC › lower › squamous cell carcinoma | C44.72 | – | – | – | – | – |
Patient EducationClinical
Skin Cancer
Skin cancer is the most common form of cancer in the United States. The two most common types are basal cell cancer and squamous cell cancer. They usually form on the head, face, neck, hands, and arms. Another type of skin cancer, melanoma, is more dangerous but less common.
Read the full article at MedlinePlus
Courtesy of MedlinePlus, a service of the U.S. National Library of Medicine.
Convert C44.721 to ICD-9-CMHistory
The closest ICD-9-CM equivalents under the General Equivalence Mappings.
Code HistoryHistory
Questions About C44.721Overview
Is C44.721 (Squamous cell carcinoma of skin of lower limb, including hip) a billable code?
Yes. This is a billable ICD-10-CM code, specific enough to report squamous cell carcinoma of skin of unspecified lower limb, including hip on HIPAA-covered claims from October 1, 2025 through September 30, 2026.
What MS-DRG does C44.721 group to?
When squamous cell carcinoma of skin of unspecified lower limb, including hip is the principal diagnosis on an inpatient stay, it groups to MS-DRG 606, 607, with relative weights from 0.9064 to 1.5132 depending on complications. Higher weights mean higher Medicare reimbursement.
What is the ICD-9 equivalent of C44.721?
Under the General Equivalence Mappings, squamous cell carcinoma of skin of unspecified lower limb, including hip converts to ICD-9-CM 173.72 (sqam cell ca skn low lmb). The mapping is approximate, so confirm the match fits the documentation.
Footnotes
[1] Not chronic - A diagnosis code that does not fit the criteria for chronic condition (duration, ongoing medical treatment, and limitations) is considered not chronic. Some codes designated as not chronic are acute conditions. Other diagnosis codes that indicate a possible chronic condition, but for which the duration of the illness is not specified in the code description (i.e., we do not know the condition has lasted 12 months or longer) also are considered not chronic.
